10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

þ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2015

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                     to                     

Commission file number 1-5975

HUMANA INC.

(Exact name of registrant as specified in its charter)

Delaware	61-0647538
(State of incorporation)	(I.R.S. Employer Identification Number)
500 West Main Street Louisville, Kentucky	40202
(Address of principal executive offices)	(Zip Code)
Registrant’s telephone number, including area code: (502) 580-1000 Securities registered pursuant to Section 12(b) of the Act:
Title of each class	Name of exchange on which registered
Common stock, $0.16 2/3 par value	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  þ    No  ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  þ

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  þ    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  þ    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  þ

Indicate by checkmark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer   þ    Accelerated filer  ¨    Non-accelerated filer  ¨    Smaller reporting company  ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  þ

The aggregate market value of voting stock held by non-affiliates of the Registrant as of June 30, 2015 was $28,626,230,036 calculated using the average price on June 30, 2015 of $193.67.

The number of shares outstanding of the Registrant’s Common Stock as of January 31, 2016 was 148,303,389.

DOCUMENTS INCORPORATED BY REFERENCE

Parts II and III incorporate herein by reference portions of the Registrant’s Proxy Statement to be filed pursuant to Regulation 14A with respect to the Annual Meeting of Stockholders scheduled to be held on April 21, 2016.

HUMANA INC.

INDEX TO ANNUAL REPORT ON FORM 10-K

For the Year Ended December 31, 2015

		Page
	Part I
Item 1.	Business	3
Item 1A.	Risk Factors	17
Item 1B.	Unresolved Staff Comments	34
Item 2.	Properties	35
Item 3.	Legal Proceedings	36
Item 4.	Mine Safety Disclosures	36
	Part II
Item 5.	Market for the Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	37
Item 6.	Selected Financial Data	40
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	41
Item 7A.	Quantitative and Qualitative Disclosures about Market Risk	83
Item 8.	Financial Statements and Supplementary Data	85
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	138
Item 9A.	Controls and Procedures	138
Item 9B.	Other Information	139
	Part III
Item 10.	Directors, Executive Officers and Corporate Governance	140
Item 11.	Executive Compensation	143
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	143
Item 13.	Certain Relationships and Related Transactions, and Director Independence	144
Item 14.	Principal Accounting Fees and Services	144
	Part IV
Item 15.	Exhibits, Financial Statement Schedules	145
	Signatures and Certifications	156

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Forward-Looking Statements

Some of the statements under “Business,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and elsewhere in this report may contain forward-looking statements which reflect our current views with respect to future events and financial performance. These forward-looking statements are made within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, or the Exchange Act. We intend such forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995, and we are including this statement for purposes of complying with these safe harbor provisions. We have based these forward-looking statements on our current expectations and projections about future events, trends and uncertainties. These forward-looking statements are not guarantees of future performance and are subject to risks, uncertainties and assumptions, including the information discussed under the section entitled “Risk Factors” in this report. In making these statements, we are not undertaking to address or update them in future filings or communications regarding our business or results. Our business is highly complicated, regulated and competitive with many different factors affecting results.

PART I

ITEM 1. BUSINESS

General

Headquartered in Louisville, Kentucky, Humana Inc. and its subsidiaries, referred to throughout this document as “we,” “us,” “our,” the “Company” or “Humana,” is a leading health and well-being company focused on making it easy for people to achieve their best health with clinical excellence through coordinated care. Our strategy integrates care delivery, the member experience, and clinical and consumer insights to encourage engagement, behavior change, proactive clinical outreach and wellness for the millions of people we serve across the country. As of December 31, 2015, we had approximately 14.2 million members in our medical benefit plans, as well as approximately 7.2 million members in our specialty products. During 2015, 73% of our total premiums and services revenue were derived from contracts with the federal government, including 14% derived from our individual Medicare Advantage contracts in Florida with the Centers for Medicare and Medicaid Services, or CMS, under which we provide health insurance coverage to approximately 587,400 members as of December 31, 2015.

Humana Inc. was organized as a Delaware corporation in 1964. Our principal executive offices are located at 500 West Main Street, Louisville, Kentucky 40202, the telephone number at that address is (502) 580-1000, and our website address is www.humana.com. We have made available free of charge through the Investor Relations section of our web site our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, proxy statements, and, if applicable, amendments to those reports filed or furnished pursuant to Section 13(a) of the Exchange Act, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the Securities and Exchange Commission.

This Annual Report on Form 10-K, or 2015 Form 10-K, contains both historical and forward-looking information. See Item 1A. – Risk Factors in this 2015 Form 10-K for a description of a number of factors that may adversely affect our results or business.

Aetna Merger

On July 2, 2015, we entered into an Agreement and Plan of Merger, which we refer to in this report as the Merger Agreement, with Aetna Inc. and certain wholly owned subsidiaries of Aetna Inc., which we refer to collectively as Aetna, which sets forth the terms and conditions under which we will merge with, and become a wholly owned subsidiary of Aetna, a transaction we refer to in this report as the Merger. Under the terms of the Merger Agreement, at the closing of the Merger, each outstanding share of our common stock will be converted into the right to receive (i) 0.8375 of a share of Aetna common stock and (ii) $125 in cash. The total transaction was estimated at approximately $37 billion including the assumption of Humana debt, based on the closing price of Aetna common shares on July 2, 2015. The Merger Agreement includes customary restrictions on the conduct of our business prior to the completion of the Merger,

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generally requiring us to conduct our business in the ordinary course and subjecting us to a variety of customary specified limitations absent Aetna’s prior written consent, including, for example, limitations on dividends (we agreed that our quarterly dividend will not exceed $0.29 per share) and repurchases of our securities (we agreed to suspend our share repurchase program), restrictions on our ability to enter into material contracts, and negotiated thresholds for capital expenditures, capital contributions, acquisitions and divestitures of businesses.

On October 19, 2015, our stockholders approved the adoption of the Merger Agreement at a special stockholder meeting.Also on October 19, 2015, the holders of Aetna outstanding shares approved the issuance of Aetna common stock in the Merger at a special meeting of Aetna shareholders.

The Merger is subject to customary closing conditions, including, among other things, (i) the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the receipt of necessary approvals under state insurance and healthcare laws and regulations and pursuant to certain licenses of certain of Humana’s subsidiaries, (ii) the absence of legal restraints and prohibitions on the consummation of the Merger, (iii) listing of the Aetna common stock to be issued in the Merger on the New York Stock Exchange, (iv) subject to the relevant standards set forth in the Merger Agreement, the accuracy of the representations and warranties made by each party, (v) material compliance by each party with its covenants in the Merger Agreement, and (vi) no “Company Material Adverse Effect” with respect to us and no “Parent Material Adverse Effect” with respect to Aetna, in each case since the execution of and as defined in the Merger Agreement. In addition, Aetna’s obligation to consummate the Merger is subject to (a) the condition that the required regulatory approvals do not impose any condition that, individually or in the aggregate, would reasonably be expected to have a “Regulatory Material Adverse Effect” (as such term is defined in the Merger Agreement), and (b) CMS has not imposed any sanctions with respect to our Medicare Advantage, or MA, business that, individually or in the aggregate, is or would reasonably be expected to be material and adverse to us and our subsidiaries, taken as a whole. The Merger is currently expected to close in the second half of 2016.

Health Care Reform

The Patient Protection and Affordable Care Act and The Health Care and Education Reconciliation Act of 2010 (which we collectively refer to as the Health Care Reform Law) enacted significant reforms to various aspects of the U.S. health insurance industry. Certain significant provisions of the Health Care Reform Law include, among others, mandated coverage requirements, mandated benefits and guarantee issuance associated with commercial medical insurance, rebates to policyholders based on minimum benefit ratios, adjustments to Medicare Advantage premiums, the establishment of federally-facilitated or state-based exchanges coupled with programs designed to spread risk among insurers, and the introduction of plan designs based on set actuarial values. In addition, the Health Care Reform Law established insurance industry assessments, including an annual health insurance industry fee and a three-year industry wide commercial reinsurance fee. The Health Care Reform Law is discussed more fully in Item 7. – Management’s Discussion and Analysis of Financial Condition and Results of Operations under the section titled “Health Care Reform” in this 2015 Form 10-K.

Business Segments

On January 1, 2015, we realigned certain of our businesses among our reportable segments to correspond with internal management reporting changes and renamed our Employer Group segment to the Group segment. Our three reportable segments remain Retail, Group, and Healthcare Services. The more significant realignments included reclassifying Medicare benefits offered to groups to the Retail segment from the Group segment, bringing all of our Medicare offerings, which are now managed collectively, together in one segment, recognizing that in some instances we market directly to individuals that are part of a group Medicare account. In addition, we realigned our military services business, primarily consisting of our TRICARE South Region contract previously included in the Other Businesses category, to our Group segment as we consider this contract with the government to be a group account. Prior period segment financial information has been recast to conform to the 2015 presentation. See Note 17 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data in this 2015 Form 10-K for segment financial information.

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We manage our business with three reportable segments: Retail, Group, and Healthcare Services. In addition, the Other Businesses category includes businesses that are not individually reportable because they do not meet the quantitative thresholds required by generally accepted accounting principles. These segments are based on a combination of the type of health plan customer and adjacent businesses centered on well-being solutions for our health plans and other customers, as described below. These segment groupings are consistent with information used by our Chief Executive Officer to assess performance and allocate resources.

Our Products

Our medical and specialty insurance products allow members to access health care services primarily through our networks of health care providers with whom we have contracted. These products may vary in the degree to which members have coverage. Health maintenance organizations, or HMOs, generally require a referral from the member’s primary care provider before seeing certain specialty physicians. Preferred provider organizations, or PPOs, provide members the freedom to choose a health care provider without requiring a referral. However PPOs generally require the member to pay a greater portion of the provider’s fee in the event the member chooses not to use a provider participating in the PPO’s network. Point of Service, or POS, plans combine the advantages of HMO plans with the flexibility of PPO plans. In general, POS plans allow members to choose, at the time medical services are needed, to seek care from a provider within the plan’s network or outside the network. In addition, we offer services to our health plan members as well as to third parties that promote health and wellness, including pharmacy solutions, provider, home based, and clinical programs, as well as services and capabilities to advance population health. At the core of our strategy is our integrated care delivery model, which unites quality care, high member engagement, and sophisticated data analytics. Three core elements of the model are to improve the consumer experience by simplifying the interaction with us, engaging members in clinical programs, and offering assistance to providers in transitioning from a fee-for-service to a value-based arrangement. Our approach to primary, physician-directed care for our members aims to provide quality care that is consistent, integrated, cost-effective, and member-focused. The model is designed to improve health outcomes and affordability for individuals and for the health system as a whole, while offering our members a simple, seamless healthcare experience. The discussion that follows describes the products offered by each of our segments.

Our Retail Segment Products

This segment is comprised of products sold on a retail basis to individuals including medical and supplemental benefit plans described in the discussion that follows. The following table presents our premiums and services revenue for the Retail segment by product for the year ended December 31, 2015:

	Retail Segment Premiums and Services Revenue		Percent of Consolidated Premiums  and Services Revenue
	(dollars in millions)
Premiums:
Individual Medicare Advantage	$	29,526	54.9	%
Group Medicare Advantage	5,588		10.4	%
Medicare stand-alone PDP	3,846		7.1	%
Total Medicare	38,960		72.4	%
Individual commercial	4,243		7.9	%
State-based Medicaid	2,341		4.3	%
Individual specialty	261		0.5	%
Total premiums	45,805		85.1	%
Services	9		—	%
Total premiums and services revenue	$	45,814	85.1	%

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Medicare

We have participated in the Medicare program for private health plans for over 30 years and have established a national presence, offering at least one type of Medicare plan in all 50 states. We have a geographically diverse membership base that we believe provides us with greater ability to expand our network of PPO and HMO providers. We employ strategies including health assessments and clinical guidance programs such as lifestyle and fitness programs for seniors to guide Medicare beneficiaries in making cost-effective decisions with respect to their health care. We believe these strategies result in cost savings that occur from making positive behavior changes.

Medicare is a federal program that provides persons age 65 and over and some disabled persons under the age of 65 certain hospital and medical insurance benefits. CMS, an agency of the United States Department of Health and Human Services, administers the Medicare program. Hospitalization benefits are provided under Part A, without the payment of any premium, for up to 90 days per incident of illness plus a lifetime reserve aggregating 60 days. Eligible beneficiaries are required to pay an annually adjusted premium to the federal government to be eligible for physician care and other services under Part B. Beneficiaries eligible for Part A and Part B coverage under traditional fee-for-service Medicare are still required to pay out-of-pocket deductibles and coinsurance. Throughout this document this program is referred to as Medicare FFS. As an alternative to Medicare FFS, in geographic areas where a managed care organization has contracted with CMS pursuant to the Medicare Advantage program, Medicare beneficiaries may choose to receive benefits from a Medicare Advantage organization under Medicare Part C. Pursuant to Medicare Part C, Medicare Advantage organizations contract with CMS to offer Medicare Advantage plans to provide benefits at least comparable to those offered under Medicare FFS. Our Medicare Advantage plans are discussed more fully below. Prescription drug benefits are provided under Part D.

Individual Medicare Advantage Products

We contract with CMS under the Medicare Advantage program to provide a comprehensive array of health insurance benefits, including wellness programs, chronic care management, and care coordination, to Medicare eligible persons under HMO, PPO, and Private Fee-For-Service, or PFFS, plans in exchange for contractual payments received from CMS, usually a fixed payment per member per month. With each of these products, the beneficiary receives benefits in excess of Medicare FFS, typically including reduced cost sharing, enhanced prescription drug benefits, care coordination, data analysis techniques to help identify member needs, complex case management, tools to guide members in their health care decisions, care management programs, wellness and prevention programs and, in some instances, a reduced monthly Part B premium. Most Medicare Advantage plans offer the prescription drug benefit under Part D as part of the basic plan, subject to cost sharing and other limitations. Accordingly, all of the provisions of the Medicare Part D program described in connection with our stand-alone prescription drug plans in the following section also are applicable to most of our Medicare Advantage plans. Medicare Advantage plans may charge beneficiaries monthly premiums and other copayments for Medicare-covered services or for certain extra benefits. Generally, Medicare-eligible individuals enroll in one of our plan choices between October 15 and December 7 for coverage that begins on the following January 1.

Our Medicare HMO and PPO plans, which cover Medicare-eligible individuals residing in certain counties, may eliminate or reduce coinsurance or the level of deductibles on many other medical services while seeking care from participating in-network providers or in emergency situations. Except in emergency situations or as specified by the plan, most HMO plans provide no out-of-network benefits. PPO plans carry an out-of network benefit that is subject to higher member cost-sharing. In some cases, these beneficiaries are required to pay a monthly premium to the HMO or PPO plan in addition to the monthly Part B premium they are required to pay the Medicare program.

Most of our Medicare PFFS plans are network-based products with in and out of network benefits due to a requirement that Medicare Advantage organizations establish adequate provider networks, except in geographic areas that CMS determines have fewer than two network-based Medicare Advantage plans. In these areas, we offer Medicare PFFS plans that have no preferred network. Individuals in these plans pay us a monthly premium to receive typical Medicare Advantage benefits along with the freedom to choose any health care provider that accepts individuals at rates equivalent to Medicare FFS payment rates.

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CMS uses monthly rates per person for each county to determine the fixed monthly payments per member to pay to health benefit plans. These rates are adjusted under CMS’s risk-adjustment model which uses health status indicators, or risk scores, to improve the accuracy of payment. The risk-adjustment model, which CMS implemented pursuant to the Balanced Budget Act of 1997 (BBA) and the Benefits and Improvement Protection Act of 2000 (BIPA), generally pays more for members with predictably higher costs and uses principal hospital inpatient diagnoses as well as diagnosis data from ambulatory treatment settings (hospital outpatient department and physician visits) to establish the risk-adjustment payments. Under the risk-adjustment methodology, all health benefit organizations must collect from providers and submit the necessary diagnosis code information to CMS within prescribed deadlines.

At December 31, 2015, we provided health insurance coverage under CMS contracts to approximately 2,753,400 individual Medicare Advantage members, including approximately 587,400 members in Florida. These Florida contracts accounted for premiums revenue of approximately $7.8 billion, which represented approximately 26.3% of our individual Medicare Advantage premiums revenue, or 14.5% of our consolidated premiums and services revenue for the year ended December 31, 2015.

Our HMO, PPO, and PFFS products covered under Medicare Advantage contracts with CMS are renewed generally for a calendar year term unless CMS notifies us of its decision not to renew by May 1 of the calendar year in which the contract would end, or we notify CMS of our decision not to renew by the first Monday in June of the calendar year in which the contract would end. All material contracts between Humana and CMS relating to our Medicare Advantage products have been renewed for 2016, and all of our product offerings filed with CMS for 2016 have been approved.

Individual Medicare Stand-Alone Prescription Drug Products

We offer stand-alone prescription drug plans, or PDPs, under Medicare Part D, including a PDP offering co-branded with Wal-Mart Stores, Inc., or the Humana-Walmart plan. Generally, Medicare-eligible individuals enroll in one of our plan choices between October 15 and December 7 for coverage that begins on the following January 1. Our stand-alone PDP offerings consist of plans offering basic coverage with benefits mandated by Congress, as well as plans providing enhanced coverage with varying degrees of out-of-pocket costs for premiums, deductibles, and co-insurance. Our revenues from CMS and the beneficiary are determined from our PDP bids submitted annually to CMS. These revenues also reflect the health status of the beneficiary and risk sharing provisions as more fully described in Item 7. – Management’s Discussion and Analysis of Financial Condition and Results of Operations under the section titled “Medicare Part D Provisions.” Our stand-alone PDP contracts with CMS are renewed generally for a calendar year term unless CMS notifies us of its decision not to renew by May 1 of the calendar year in which the contract would end, or we notify CMS of our decision not to renew by the first Monday in June of the calendar year in which the contract would end. All material contracts between Humana and CMS relating to our Medicare stand-alone PDP products have been renewed for 2016, and all of our product offerings filed with CMS for 2016 have been approved.

We have administered CMS’s Limited Income Newly Eligible Transition, or LI-NET, prescription drug plan program since 2010. This program allows individuals who receive Medicare’s low-income subsidy to also receive immediate prescription drug coverage at the point of sale if they are not already enrolled in a Medicare Part D plan. CMS temporarily enrolls newly identified individuals with both Medicare and Medicaid into the LI-NET prescription drug plan program, and subsequently transitions each member into a Medicare Part D plan that may or may not be a Humana Medicare plan.

Group Medicare Advantage and Medicare stand-alone PDP

We offer products that enable employers that provide post-retirement health care benefits to replace Medicare wrap or Medicare supplement products with Medicare Advantage or stand-alone PDPs from Humana. These products offer the same types of benefits and services available to members in our individual Medicare plans discussed previously and can be tailored to closely match an employer’s post-retirement benefit structure.

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State-based Medicaid Contracts

Our state-based contracts allow us to serve members enrolled in state-based Medicaid programs including Temporary Assistance to Needy Families, or TANF, Long-Term Support Services, or LTSS, and dual eligible demonstration programs. TANF is a state and federally funded program that provides cash assistance and supportive services to assist families with children under age 18, helping them achieve economic self-sufficiency. LTSS is a state and federally funded program that offers states a broad and flexible set of program design options and refers to the delivery of long-term support services for our members who receive home and community or institution-based services for long-term care. Our American Eldercare Inc., or American Eldercare, acquisition in 2013 expanded our LTSS footprint in Florida. Our contracts are generally for three to five year terms.

Medicare beneficiaries who also qualify for Medicaid due to low income or special needs are known as dual eligible beneficiaries, or dual eligibles. The dual eligible population represents a disproportionate share of Medicaid and Medicare costs. There were approximately 10.2 million dual eligible individuals in the United States in 2015, trending upward due to Medicaid eligibility expansions and individuals aging into the Medicare program. Since the enactment of the Health Care Reform Law, states are pursuing stand-alone dual eligible CMS demonstration programs in which Medicare, Medicaid, and LTSS benefits are more tightly integrated. Eligibility for participation in these stand-alone dual eligible demonstration programs may require state-based contractual relationships in existing Medicaid programs.

We have contracts to serve Medicaid eligible members in Florida under the TANF and LTSS programs. Our contracts in Virginia and Illinois serve members under each state’s stand-alone dual eligible demonstration program. In addition, in Illinois we have an Integrated Care Program, or ICP, Medicaid contract. Our Kentucky Medicaid contract is subject to a 100% coinsurance contract with CareSource Management Group Company, ceding all the risk to CareSource.

In addition to the dual eligible members we serve under the Virginia and Illinois demonstration program, we serve other dual eligible members enrolled in our Medicare Advantage and stand-alone prescription drug plans. As of December 31, 2015, we served approximately 440,000 dual eligible members in our Medicare Advantage plans and approximately 1,070,000 dual eligible members in our stand-alone prescription drug plans.

Individual Commercial Coverage

Our individual health plans are marketed under the HumanaOne^® brand. We offer products both on and off of the public exchange. We offer products on exchanges where we can achieve an affordable cost of care, including HMO offerings and select networks in most markets. Our off-exchange products are primarily PPO and POS offerings, including plans issued prior to 2014 that were previously underwritten. Policies issued prior to the enactment of the Health Care Reform Law on March 23, 2010 are grandfathered policies. Grandfathered policies are exempt from most of the requirements of the Health Care Reform Law, including mandated benefits. However, our grandfathered plans include provisions that guarantee renewal of coverage for as long as the plan is continued and the individual chooses to renew. Policies issued between March 23, 2010 and December 31, 2013 are required to conform to the Health Care Reform Law, including mandated benefits, upon renewal at various transition dates between 2016 and 2017 depending on the state.

Prior to 2014, our HumanaOne^® plans primarily were offered as PPO plans where we could generally underwrite risk and utilize our existing networks and distribution channels.

Rewards-based wellness programs are included with many individual products. We also offer optional benefits such as dental, vision, life, and a portfolio of financial protection products.

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Group Segment Products

This segment is comprised of products sold to employer groups including medical and supplemental benefit plans as well as health and wellness products as described in the discussion that follows. The following table presents our premiums and services revenue for the Group segment by product for the year ended December 31, 2015:

	Group Segment Premiums and Services Revenue		Percent of Consolidated Premiums  and Services Revenue
	(dollars in millions)
External Revenue:
Premiums:
Fully-insured commercial group	$	5,493	10.2	%
Group specialty	1,055		2.0	%
Military services	21		—	%
Total premiums	6,569		12.2	%
Services	698		1.3	%
Total premiums and services revenue	$	7,267	13.5	%
Intersegment services revenue:
Wellness	$	93	n/a
Total intersegment services revenue	$	93

n/a – not applicable

Group Commercial Coverage

Our commercial products sold to employer groups include a broad spectrum of major medical benefits with multiple in-network coinsurance levels and annual deductible choices that employers of all sizes can offer to their employees on either a fully-insured, through HMO, PPO, or POS plans, or self-funded basis. Our plans integrate clinical programs, plan designs, communication tools, and spending accounts. We participate in the Federal Employee Health Benefits Program, or FEHBP, primarily with our HMO offering in certain markets. FEHBP is the government’s health insurance program for Federal employees, retirees, former employees, family members, and spouses. As with our individual commercial products, the employer group offerings include HumanaVitality^®, our wellness and loyalty reward program.

Our administrative services only, or ASO, products are offered to employers who self-insure their employee health plans. We receive fees to provide administrative services which generally include the processing of claims, offering access to our provider networks and clinical programs, and responding to customer service inquiries from members of self-funded employers. These products may include all of the same benefit and product design characteristics of our fully-insured HMO, PPO, or POS products described previously. Under ASO contracts, self-funded employers generally retain the risk of financing substantially all of the cost of health benefits. However, more than half of our ASO customers purchase stop loss insurance coverage from us to cover catastrophic claims or to limit aggregate annual costs.

As with individual commercial policies, employers can customize their offerings with optional benefits such as dental, vision, life, and a portfolio of voluntary benefit products.

Military Services

Under our TRICARE South Region contract with the United States Department of Defense, or DoD, we provide administrative services to arrange health care services for the dependents of active duty military personnel and for retired military personnel and their dependents. We have participated in the TRICARE program since 1996 under contracts with the DoD. On April 1, 2012, we began delivering services under our current TRICARE South Region contract that the Defense Health Agency, or DHA (formerly known as the TRICARE Management Activity), awarded to us on February 25, 2011. Under the current contract, we provide administrative services while the federal government

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retains all of the risk of the cost of health benefits. Accordingly, we account for revenues under the current contract net of estimated health care costs similar to an administrative services fee only agreement.

Wellness

We offer wellness solutions including our Humana Vitality^® wellness and loyalty rewards program, health coaching, and clinical programs. These programs, when offered collectively to employer customers as our Total Health product, turn any standard plan of the employer's choosing into an integrated health and well-being solution that encourages participation in these programs.

Our Humana Vitality^® program provides our members with access to a science-based, actuarially driven wellness and loyalty program that features a wide range of well-being tools and rewards that are customized to an individual’s needs and wants. A key element of the program includes a sophisticated health-behavior-change model supported by an incentive program.

We also provide employee assistance programs and coaching services including a comprehensive turn-key coaching program, an enhancement to a medically based coaching protocol and a platform that makes coaching programs more efficient.

Our Healthcare Services Segment Products

The products offered by our Healthcare Services segment are key to our integrated care delivery model. This segment is comprised of stand-alone businesses that offer services including pharmacy solutions, provider services, home based services, clinical programs, and predictive modeling and informatics services to other Humana businesses, as well as external health plan members, external health plans, and other employers or individuals and are described in the discussion that follows. Our intersegment revenue is described in Note 17 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data. The following table presents our services revenue for the Healthcare Services segment by line of business for the year ended December 31, 2015:

	Healthcare  Services Segment Services Revenue		Percent of Consolidated Premiums  and Services Revenue
	(dollars in millions)
Intersegment revenue:
Pharmacy solutions	$	20,551	n/a
Provider services	1,291		n/a
Home based services	875		n/a
Clinical programs	203		n/a
Total intersegment revenue	$	22,920
External services revenue:
Provider services	$	515	0.9	%
Home based services	140		0.3	%
Pharmacy solutions	30		0.1	%
Total external services revenue	$	685	1.3	%

n/a – not applicable

Pharmacy solutions

Humana Pharmacy Solutions^®, or HPS, manages traditional prescription drug coverage for both individuals and employer groups in addition to providing a broad array of pharmacy solutions. HPS also operates prescription mail order services for brand, generic, and specialty drugs and diabetic supplies through Humana Pharmacy, Inc., as well as research services.

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Provider services

We operate full-service, multi-specialty medical centers, primarily in Florida, staffed by primary care providers and medical specialists practicing cardiology, endocrinology, geriatric medicine, internal medicine, ophthalmology, neurology, and podiatry.

We also operate Transcend, a Medical Services Organization, or MSO, that coordinates medical care for Medicare Advantage beneficiaries primarily in Florida, Arkansas, Alabama and Kansas. Transcend provides resources in care coordination, financial risk management, clinical integration and patient engagement that help physicians improve the patient experience as well as care outcomes. Transcend collaborates with physicians, medical groups and integrated delivery systems to successfully transition to value-based care by engaging, partnering and offering practical services and solutions. Transcend represents a key component of our integrated care delivery model which we believe is scalable to new markets. In addition, we own a noncontrolling equity interest in MCCI Holdings, LLC, a privately held MSO headquartered in Miami, Florida, that primarily coordinates medical care for Medicare Advantage beneficiaries in Florida, Texas and Georgia.

Programs to enhance the quality of care for members are key elements of our integrated care delivery model. We believe that technology represents a significant opportunity in health care that positively impacts our members. Our Transcend Insights business focuses on population health and wellness capabilities across the sector and serves health care systems, physicians and care teams by leveraging actionable data to help improve patient care. We help care teams and patients transition from a reactive approach to care to one that proactively promotes health and long-term wellness. We have enhanced our health information technology capabilities enabling us to create a more complete view of an individual’s health, designed to connect, coordinate and simplify health care while reducing costs. These capabilities include our health care analytics engine, which reviews billions of clinical data points on millions of patients each day to provide members, providers, and payers real-time clinical insights to identify evidence-based gaps-in-care, drug safety alerts and other critical health concerns to improve outcomes. Additionally, our technology connects Humana and disparate electronic health record systems to enable the exchange of essential health information in real-time to provide physicians and care teams with a single, comprehensive patient view.

On June 1, 2015, we completed the sale of our wholly owned subsidiary, Concentra Inc., or Concentra, that delivered occupational medicine, urgent care, physical therapy, and wellness services to employees and the general public through its operation of medical centers and worksite medical facilities.

Home based services

Via in-home care, telephonic health counseling/coaching, and remote monitoring, we are actively involved in the care management of our customers with the greatest needs. Home based services include the operations of Humana At Home, Inc., or Humana At Home^®. As a chronic-care provider of in-home care for seniors, we provide innovative and holistic care coordination services for individuals living with multiple chronic conditions, individuals with disabilities, fragile and aging-in-place members and their care givers. We focus our deployment of these services in geographies, such as Florida, with a high concentration of members living with multiple chronic conditions. The clinical support and care provided by Humana At Home^® is designed to improve health outcomes and result in a higher number of days members can spend at their homes instead of in an acute care facility. To that end, we have accelerated our process for identifying and reaching out to members in need of clinical intervention. At December 31, 2015, we enrolled approximately 590,300 members with complex chronic conditions in the Humana Chronic Care Program, a 40.3%increase compared with approximately 420,700 members at December 31, 2014, reflecting enhanced predictive modeling capabilities and focus on proactive clinical outreach and member engagement, particularly for our Medicare Advantage membership. We believe these initiatives lead to better health outcomes for our members and lower health care costs.

Clinical programs

We are committed to the integrated physical and mental health of our members. Accordingly, we take a holistic approach to healthcare, offering care management, behavioral health services and wellness programs.

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Our care management programs take full advantage of the population health, wellness and clinical applications offered by Transcend Insights and CareHub, our clinical management tool used by providers and care managers across the company to help our members achieve their best health, to offer various levels of support, matching the intensity of the support to the needs of members with ongoing health challenges through telephonic and onsite programs. These programs include Personal Nurse, chronic condition management, and case management as well as programs supporting maternity, cancer, neonatal intensive care unit, and transplant services.

In addition, we focus on the behavioral aspects of a members' health such as managing stress and work/life balance. Humana Behavioral Health takes a holistic, mind-and-body approach to behavioral healthcare to address the whole person, encouraging faster recovery and improving clinical outcomes while reducing costs for both the member and employer.

Other Businesses

Other Businesses primarily includes our closed block of long-term care insurance policies described below. Total premiums and services revenue for our Other Businesses was $49 million, or 0.1% of consolidated premiums and services revenue for the year ended December 31, 2015.

We have a non-strategic closed block of approximately 31,800 long-term care insurance policies associated with our acquisition of KMG America Corporation in 2007. Long-term care insurance policies are intended to protect the insured from the cost of long-term care services including those provided by nursing homes, assisted living facilities, and adult day care as well as home health care services. No new policies have been written since 2005 under this closed block.

Membership

The following table summarizes our total medical membership at December 31, 2015, by market and product:

	Retail Segment					Group Segment
	(in thousands)
	Individual Medicare Advantage	Group Medicare Advantage	Medicare stand- alone PDP	Individual Commercial	State- based contracts	Fully- insured commercial Group	ASO	Military services	Other Businesses	Total	Percent of Total
Florida	587.4	19.9	320.5	288.4	351.9	168.4	33.8	—	—	1,770.3	12.5	%
Texas	215.6	68.8	281.4	163.8	—	217.3	107.2	—	—	1,054.1	7.4	%
Georgia	105.2	2.5	115.0	270.2	—	155.3	18.6	—	—	666.8	4.7	%
Kentucky	69.9	56.1	203.8	17.6	—	109.3	195.5	—	—	652.2	4.6	%
Ohio	105.8	155.6	143.5	20.8	—	46.3	70.1	—	—	542.1	3.8	%
California	64.9	0.1	420.7	13.3	—	—	—	—	—	499.0	3.5	%
Illinois	81.7	20.8	154.1	11.3	12.0	82.4	95.0	—	—	457.3	3.2	%
Missouri/Kansas	100.6	3.4	202.0	18.7	—	52.9	9.4	—	—	387.0	2.7	%
Tennessee	139.8	2.0	97.5	26.5	—	47.0	34.9	—	—	347.7	2.5	%
Wisconsin	63.2	10.1	95.8	8.5	—	84.2	80.1	—	—	341.9	2.4	%
Louisiana	147.2	10.9	54.4	20.6	—	67.9	31.7	—	—	332.7	2.3	%
North Carolina	129.4	37.2	158.4	5.6	—	—	—	—	—	330.6	2.3	%
Indiana	88.1	3.7	120.2	12.1	—	22.4	17.2	—	—	263.7	1.9	%
Virginia	111.2	5.5	125.5	8.9	9.8	—	—	—	—	260.9	1.8	%
Michigan	48.8	14.1	135.8	19.4	—	6.5	0.5	—	—	225.1	1.6	%
Colorado	35.2	5.5	83.3	22.7	—	24.8	1.1	—	—	172.6	1.2	%
Arizona	57.8	1.2	75.3	8.4	—	28.4	1.2	—	—	172.3	1.2	%
Military services	—	—	—	—	—	—	—	3,074.4	—	3,074.4	21.6	%
Others	601.6	66.7	1,770.7	120.9	—	65.2	14.4	—	32.6	2,672.1	18.8	%
Totals	2,753.4	484.1	4,557.9	1,057.7	373.7	1,178.3	710.7	3,074.4	32.6	14,222.8	100.0	%

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Provider Arrangements

We provide our members with access to health care services through our networks of health care providers whom we employ or with whom we have contracted, including hospitals and other independent facilities such as outpatient surgery centers, primary care providers, specialist physicians, dentists, and providers of ancillary health care services and facilities. These ancillary services and facilities include laboratories, ambulance services, medical equipment services, home health agencies, mental health providers, rehabilitation facilities, nursing homes, optical services, and pharmacies. Our membership base and the ability to influence where our members seek care generally enable us to obtain contractual discounts with providers.

We use a variety of techniques to provide access to effective and efficient use of health care services for our members. These techniques include the coordination of care for our members, product and benefit designs, hospital inpatient management systems, the use of sophisticated analytics, and enrolling members into various care management programs. The focal point for health care services in many of our HMO networks is the primary care provider who, under contract with us, provides services to our members, and may control utilization of appropriate services by directing or approving hospitalization and referrals to specialists and other providers. Some physicians may have arrangements under which they can earn bonuses when certain target goals relating to the provision of quality patient care are met. We have available care management programs related to complex chronic conditions such as congestive heart failure and coronary artery disease. We also have programs for prenatal and premature infant care, asthma related illness, end stage renal disease, diabetes, cancer, and certain other conditions.

We typically contract with hospitals on either (1) a per diem rate, which is an all-inclusive rate per day, (2) a case rate or diagnosis-related groups (DRG), which is an all-inclusive rate per admission, or (3) a discounted charge for inpatient hospital services. Outpatient hospital services generally are contracted at a flat rate by type of service, ambulatory payment classifications, or APCs, or at a discounted charge. APCs are similar to flat rates except multiple services and procedures may be aggregated into one fixed payment. These contracts are often multi-year agreements, with rates that are adjusted for inflation annually based on the consumer price index, other nationally recognized inflation indexes, or specific negotiations with the provider. Outpatient surgery centers and other ancillary providers typically are contracted at flat rates per service provided or are reimbursed based upon a nationally recognized fee schedule such as the Medicare allowable fee schedule.

Our contracts with physicians typically are renewed automatically each year, unless either party gives written notice, generally ranging from 90 to 120 days, to the other party of its intent to terminate the arrangement. Most of the physicians in our PPO networks and some of our physicians in our HMO networks are reimbursed based upon a fixed fee schedule, which typically provides for reimbursement based upon a percentage of the standard Medicare allowable fee schedule.

The terms of our contracts with hospitals and physicians may also vary between Medicare and commercial business. A significant portion of our Medicare network contracts, including those with both hospitals and physicians, are tied to Medicare reimbursement levels and methodologies.

Automatic reductions to the federal budget, known as sequestration, took effect on April 1, 2013, including aggregate reductions to Medicare payments to providers of up to 2% per fiscal year. Due to the uncertainty around the application of these reductions, there can be no assurances that we can completely offset any reductions to the Medicare healthcare programs. See “Legal Proceedings and Certain Regulatory Matters” in Note 16 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

Capitation

We offer providers a continuum of opportunities to increase the integration of care and offer assistance to providers in transitioning from a fee-for-service to a value-based arrangement. These include performance bonuses, shared savings and shared risk relationships. For some of our medical membership, we share risk with providers under capitation contracts where physicians and hospitals accept varying levels of financial risk for a defined set of membership, primarily HMO membership. Under the typical capitation arrangement, we prepay these providers a monthly fixed-fee per

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member, known as a capitation (per capita) payment, to cover all or a defined portion of the benefits provided to the capitated member.

We believe these risk-based models represent a key element of our integrated care delivery model at the core of our strategy. Our health plan subsidiaries may enter into these risk-based contracts with third party providers or our owned provider subsidiaries.

At December 31, 2015, approximately 1,100,000 members, or 7.7% of our medical membership, were covered under risk-based contracts, including 863,000 individual Medicare Advantage members, or 31.3% of our total individual Medicare Advantage membership.

Physicians under capitation arrangements typically have stop loss coverage so that a physician’s financial risk for any single member is limited to a maximum amount on an annual basis. We typically process all claims and monitor the financial performance and solvency of our capitated providers. However, we delegated claim processing functions under capitation arrangements covering approximately 196,600 HMO members, including 172,000 individual Medicare Advantage members, or 19.9% of the 863,000 individual Medicare Advantage members covered under risk-based contracts at December 31, 2015, with the provider assuming substantially all the risk of coordinating the members’ health care benefits. Capitation expense under delegated arrangements for which we have a limited view of the underlying claims experience was approximately $768 million, or 1.7% of total benefits expense, for the year ended December 31, 2015. We remain financially responsible for health care services to our members in the event our providers fail to provide such services.

Accreditation Assessment

Our accreditation assessment program consists of several internal programs, including those that credential providers and those designed to meet the audit standards of federal and state agencies as well as external accreditation standards. We also offer quality and outcome measurement and improvement programs such as the Health Care Effectiveness Data and Information Sets, or HEDIS, which is used by employers, government purchasers and the National Committee for Quality Assurance, or NCQA, to evaluate health plans based on various criteria, including effectiveness of care and member satisfaction.

Providers participating in our networks must satisfy specific criteria, including licensing, patient access, office standards, after-hours coverage, and other factors. Most participating hospitals also meet accreditation criteria established by CMS and/or the Joint Commission on Accreditation of Healthcare Organizations.

Recredentialing of participating providers occurs every two to three years, depending on applicable state laws. Recredentialing of participating providers includes verification of their medical licenses, review of their malpractice liability claims histories, review of their board certifications, if applicable, and review of applicable quality information. A committee, composed of a peer group of providers, reviews the applications of providers being considered for credentialing and recredentialing.

We request accreditation for certain of our health plans and/or departments from NCQA, the Accreditation Association for Ambulatory Health Care, and URAC. Accreditation or external review by an approved organization is mandatory in the states of Florida and Kansas for licensure as an HMO. Additionally, all products sold on the federal and state marketplaces are required to be accredited. Certain commercial businesses, like those impacted by a third-party labor agreement or those where a request is made by the employer, may require or prefer accredited health plans.

NCQA reviews our compliance based on standards for quality improvement, credentialing, utilization management, member connections, and member rights and responsibilities. We have achieved and maintained NCQA accreditation in most of our commercial, Medicare and Medicaid HMO/POS markets with enough history and membership, and for many of our PPO markets.

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Sales and Marketing

We use various methods to market our products, including television, radio, the Internet, telemarketing, and direct mailings.

At December 31, 2015, we employed approximately 1,600 sales representatives, as well as approximately 1,400 telemarketing representatives who assisted in the marketing of Medicare and individual commercial health insurance and specialty products in our Retail segment, including making appointments for sales representatives with prospective members. We have a marketing arrangement with Wal-Mart Stores, Inc., or Wal-Mart, for our individual Medicare stand-alone PDP offering. We also sell group Medicare Advantage products through large employers. In addition, we market our Medicare and individual commercial health insurance and specialty products through licensed independent brokers and agents. For our Medicare products, commissions paid to employed sales representatives and independent brokers and agents are based on a per unit commission structure, regulated in structure and amount by CMS. For our individual commercial health insurance and specialty products, we generally pay brokers a commission based on premiums, with commissions varying by market and premium volume. In addition to a commission based directly on premium volume for sales to particular customers, we also have programs that pay brokers and agents based on other metrics. These include commission bonuses based on sales that attain certain levels or involve particular products. We also pay additional commissions based on aggregate volumes of sales involving multiple customers.

In our Group segment, individuals may become members of our commercial HMOs and PPOs through their employers or other groups, which typically offer employees or members a selection of health insurance products, pay for all or part of the premiums, and make payroll deductions for any premiums payable by the employees. We attempt to become an employer’s or group’s exclusive source of health insurance benefits by offering a variety of HMO, PPO, and specialty products that provide cost-effective quality health care coverage consistent with the needs and expectations of their employees or members. In addition, we have begun to offer plans to employer groups through private exchanges. Employers can give their employees a set amount of money and then direct them to a private exchange. There, employees can shop for a health plan and other benefits based on what the employer has selected as options. We use licensed independent brokers, independent agents, and employees to sell our group products. Many of our larger employer group customers are represented by insurance brokers and consultants who assist these groups in the design and purchase of health care products. We pay brokers and agents using the same commission structure described above for our individual commercial health insurance and specialty products.

Underwriting

Beginning in 2014, the Health Care Reform Law requires all individual and certain group health plans to guarantee issuance and renew coverage without pre-existing condition exclusions or health-status rating adjustments. Accordingly, newly issued individual and certain group health plans are not subject to underwriting in 2014 and beyond. Further, underwriting techniques are not employed in connection with our Medicare, military services, or Medicaid products because government regulations require us to accept all eligible applicants regardless of their health or prior medical history.

Prior to 2014, through the use of internally developed underwriting criteria, we determined the risk we were willing to assume and the amount of premium to charge for our commercial products. In most instances, employer and other groups had to meet our underwriting standards in order to qualify to contract with us for coverage.

Competition

The health benefits industry is highly competitive. Our competitors vary by local market and include other managed care companies, national insurance companies, and other HMOs and PPOs. Many of our competitors have a larger membership base and/or greater financial resources than our health plans in the markets in which we compete. Our ability to sell our products and to retain customers may be influenced by such factors as those described in Item 1A. – Risk Factors in this 2015 Form 10-K.

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Government Regulation

Diverse legislative and regulatory initiatives at both the federal and state levels continue to affect aspects of the nation’s health care system.

Our management works proactively to ensure compliance with all governmental laws and regulations affecting our business. We are unable to predict how existing federal or state laws and regulations may be changed or interpreted, what additional laws or regulations affecting our businesses may be enacted or proposed, when and which of the proposed laws will be adopted or what effect any such new laws and regulations will have on our results of operations, financial position, or cash flows.

For a description of certain material current activities in the federal and state legislative areas, see Item 1A. – Risk Factors in this 2015 Form 10-K.

Certain Other Services

Captive Insurance Company

We bear general business risks associated with operating our Company such as professional and general liability, employee workers’ compensation, and officer and director errors and omissions risks. Professional and general liability risks may include, for example, medical malpractice claims and disputes with members regarding benefit coverage. We retain certain of these risks through our wholly-owned, captive insurance subsidiary. We reduce exposure to these risks by insuring levels of coverage for losses in excess of our retained limits with a number of third-party insurance companies. We remain liable in the event these insurance companies are unable to pay their portion of the losses.

Centralized Management Services

We provide centralized management services to each of our health plans and to our business segments from our headquarters and service centers. These services include management information systems, product development and administration, finance, human resources, accounting, law, public relations, marketing, insurance, purchasing, risk management, internal audit, actuarial, underwriting, claims processing, billing/enrollment, and customer service. Through intercompany service agreements approved, if required, by state regulatory authorities, Humana Inc., our parent company, charges a management fee for reimbursement of certain centralized services provided to its subsidiaries.

Employees

As of December 31, 2015, we had approximately 50,100 employees and approximately 1,600 additional medical professionals working under management agreements primarily between us and affiliated physician-owned associations. We believe we have good relations with our employees and have not experienced any work stoppages.

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ITEM 1A. RISK FACTORS

Risks Relating to the Merger with Aetna

The merger with Aetna is subject to various closing conditions, including governmental and regulatory approvals as well as other uncertainties and there can be no assurances as to whether and when it may be completed.

On July 2, 2015, we entered into an Agreement and Plan of Merger (which we refer to as the “Merger Agreement”), with Aetna Inc. (or “Aetna”), Echo Merger Sub, Inc. (or “Sub 1”) and Echo Merger Sub, LLC (or “Sub 2”), each a wholly owned subsidiary of Aetna. Under the terms and subject to the conditions set forth in the Merger Agreement, Sub 1 will merge with and into us (the “Merger”). In the Merger, each outstanding share of our common stock will be converted into the right to receive (i) 0.8375 of a share of Aetna common stock and (ii) $125 in cash without interest, subject to any required withholding taxes. Immediately after the Merger, we (as the surviving corporation in the Merger) will be merged with and into Sub 2, with Sub 2 remaining as the surviving entity of that merger and as a wholly owned subsidiary of Aetna, to be renamed Humana LLC. The Merger is expected to close in the second half of 2016.

On October 19, 2015, at separate meetings, our stockholders approved the adoption of the Merger Agreement, and Aetna’s shareholders approved the issuance of Aetna common stock in the Merger. Consummation of the Merger remains subject to other customary closing conditions, however, a number of which are not within our or Aetna’s control, and it is possible that such conditions may prevent, delay or otherwise materially adversely affect the completion of the Merger. These conditions include, among other things, (i) the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the receipt of necessary approvals under state insurance and healthcare laws and regulations and pursuant to certain licenses of certain of Humana’s subsidiaries, (ii) the absence of legal restraints and prohibitions on the consummation of the Merger, (iii) listing of the Aetna common stock to be issued in the Merger on the New York Stock Exchange, (iv) subject to the relevant standards set forth in the Merger Agreement, the accuracy of the representations and warranties made by each party, (v) material compliance by each party with its covenants in the Merger Agreement, and (vi) no “Company Material Adverse Effect” with respect to us and no “Parent Material Adverse Effect” with respect to Aetna, in each case since the execution of and as defined in the Merger Agreement. In addition, Aetna’s obligation to consummate the Merger is subject to (a) the condition that the required regulatory approvals do not impose any condition that, individually or in the aggregate, would reasonably be expected to have a “Regulatory Material Adverse Effect” (as such term is defined in the Merger Agreement), and (b) CMS has not imposed any sanctions with respect to our Medicare Advantage business that, individually or in the aggregate, is or would reasonably be expected to be material and adverse to us and its subsidiaries, taken as a whole. We cannot predict with certainty whether and when any of the required closing conditions will be satisfied or if another uncertainty may arise.

If the Merger does not receive, or timely receive, the required regulatory approvals and clearances, or if any regulatory agencies impose certain conditions relating to the required regulatory approvals that would reasonably be expected to have a "Regulatory Material Adverse Effect", or if an event occurs that delays or prevents the Merger, such failure or delay to complete the Merger may cause uncertainty or other negative consequences that may materially and adversely affect our results of operations, financial position, cash flows and the price per share for our common stock.

The Merger Agreement prohibits us from pursuing alternative transactions to the Merger.

Following the receipt of approval by our stockholders and Aetna's shareholders (with respect to the Aetna stock to be issued in the transaction) on October 19, 2015, the Merger Agreement is binding on the parties, subject to customary closing conditions. The Merger Agreement prohibits us from initiating, soliciting, knowingly encouraging, knowingly facilitating or entering into discussions or negotiations with any third party regarding alternative acquisition proposals. This provision prevents us from affirmatively seeking offers from other possible acquirers that may be superior to the pending Merger. We do not have the ability to terminate the Merger Agreement in order to accept a superior proposal since our stockholders have voted to approve the adoption of the Merger Agreement.

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The number of shares of Aetna common stock that our stockholders will receive in the Merger is based on a fixed exchange ratio. Because the market price of Aetna’s common stock will fluctuate, our stockholders cannot be certain of the value of the portion of the merger consideration to be paid in Aetna common stock.

Upon completion of the Merger, each outstanding share of our common stock will be converted into the right to receive (i) 0.8375 of a share of Aetna common stock and (ii) $125 in cash without interest, subject to any required withholding taxes. The exchange ratio for determining the number of shares of Aetna common stock that our stockholders will receive in the Merger is fixed and will not be adjusted for changes in the market price of Aetna’s common stock, which will likely fluctuate before and after the completion of the Merger. Fluctuations in the value of Aetna’s common stock could result from changes in the business, operations or prospects of Aetna prior to or following the closing of the Merger, regulatory considerations, general market and economic conditions and other factors both within and beyond the control of us or Aetna.

While the Merger is pending, we are subject to business uncertainties and contractual restrictions that could materially adversely affect our results of operations, financial position and cash flows or result in a loss of employees, customers, members or suppliers.

The Merger Agreement includes restrictions on the conduct of our business prior to the completion or termination of the Merger, generally requiring us to conduct our business in the ordinary course and subjecting us to a variety of specified limitations absent Aetna’s prior written consent. We may find that these and other contractual restrictions in the Merger Agreement may delay or prevent us from responding, or limit our ability to respond, effectively to competitive pressures, industry developments and future business opportunities that may arise during such period, even if our management believes they may be advisable. The pendency of the Merger may also divert management’s attention and our resources from ongoing business and operations.

Our employees, customers, members and suppliers may experience uncertainties about the effects of the Merger. In connection with the pending Merger, it is possible that some customers, members, suppliers and other parties with whom we have a business relationship may delay or defer certain business decisions or might decide to seek to terminate, change or renegotiate their relationship with us as a result of the Merger. Similarly, current and prospective employees may experience uncertainty about their future roles with us following completion of the Merger, which may materially adversely affect our ability to attract and retain key employees. If any of these effects were to occur, it could materially and adversely impact our results of operations, financial position, cash flows and the price per share for our common stock.

Failure to consummate the Merger could negatively impact our results of operations, financial position, cash flows and the price per share for our common stock.

If the Merger is not consummated, our ongoing businesses may be materially and adversely affected and, we will not have realized any of the potential benefits of having consummated the transaction, and we will be subject to a number of risks, including the following:

• matters relating to the Merger (including integration planning) may require substantial commitments of time and resources by our management, which could otherwise have been devoted to other opportunities that may have been beneficial to us;

• the Merger Agreement includes restrictions on the conduct of our business prior to the completion or termination of the Merger, generally requiring us to conduct our business in the ordinary course and subjecting us to a variety of specified limitations absent Aetna's prior written consent. We may find that these and other contractual restrictions in the Merger Agreement may delay or prevent us from responding, or limit our ability to respond, effectively to competitive pressures, industry developments and future business opportunities that may arise during such period, even if our management believes they may be advisable. The pendency of the Merger may also divert management’s attention and our resources from ongoing business and operations;

• we may be required to pay a termination fee to Aetna and would have incurred expenses relating to the Merger; and

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• we also could be subject to litigation related to our failure to consummate the Merger or to perform our obligations under the Merger Agreement.

If the Merger is not consummated, these risks may materially and adversely affect our results of operations, financial position, cash flows and the price per share for our common stock.

Risks Relating to Our Business

If we do not design and price our products properly and competitively, if the premiums we charge are insufficient to cover the cost of health care services delivered to our members, if we are unable to implement clinical initiatives to provide a better health care experience for our members, lower costs and appropriately document the risk profile of our members, or if our estimates of benefits expense are inadequate, our profitability may be materially adversely affected. We estimate the costs of our benefits expense payments, and design and price our products accordingly, using actuarial methods and assumptions based upon, among other relevant factors, claim payment patterns, medical cost inflation, and historical developments such as claim inventory levels and claim receipt patterns. We continually review these estimates, however these estimates involve extensive judgment, and have considerable inherent variability because they are extremely sensitive to changes in claim payment patterns and medical cost trends. Any reserve, including a premium deficiency reserve, may be insufficient.

We use a substantial portion of our revenues to pay the costs of health care services delivered to our members. These costs include claims payments, capitation payments to providers (predetermined amounts paid to cover services), and various other costs incurred to provide health insurance coverage to our members. These costs also include estimates of future payments to hospitals and others for medical care provided to our members. Generally, premiums in the health care business are fixed for one-year periods. Accordingly, costs we incur in excess of our benefit cost projections generally are not recovered in the contract year through higher premiums. We estimate the costs of our future benefit claims and other expenses using actuarial methods and assumptions based upon claim payment patterns, medical inflation, historical developments, including claim inventory levels and claim receipt patterns, and other relevant factors. We also record benefits payable for future payments. We continually review estimates of future payments relating to benefit claims costs for services incurred in the current and prior periods and make necessary adjustments to our reserves, including premium deficiency reserves where appropriate. However, these estimates involve extensive judgment, and have considerable inherent variability that is sensitive to claim payment patterns and medical cost trends. Many factors may and often do cause actual health care costs to exceed what was estimated and used to set our premiums. These factors may include:

• increased use of medical facilities and services;

• increased cost of such services;

• increased use or cost of prescription drugs, including specialty prescription drugs;

• the introduction of new or costly treatments, including new technologies;

• our membership mix;

• variances in actual versus estimated levels of cost associated with new products, benefits or lines of business, product changes or benefit level changes;

• changes in the demographic characteristics of an account or market;

• changes or reductions of our utilization management functions such as preauthorization of services, concurrent review or requirements for physician referrals;

• changes in our pharmacy volume rebates received from drug manufacturers;

• catastrophes, including acts of terrorism, public health epidemics, or severe weather (e.g. hurricanes and earthquakes);

• medical cost inflation; and

• government mandated benefits or other regulatory changes, including any that result from the Health Care Reform Law.

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Key to our operational strategy is the implementation of clinical initiatives that we believe provide a better health care experience for our members, lower the cost of healthcare services delivered to our members, and appropriately document the risk profile of our members. Our profitability and competitiveness depend in large part on our ability to appropriately manage health care costs through, among other things, the application of medical management programs such as our chronic care management program.

In addition, we also estimate costs associated with long-duration insurance policies including long-term care, life insurance, annuities, and certain health and other supplemental insurance policies sold to individuals for which some of the premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. At policy issuance, these future policy benefit reserves are recognized on a net level premium method based on interest rates, mortality, morbidity, and maintenance expense assumptions. Because these policies have long-term claim payout periods, there is a greater risk of significant variability in claims costs, either positive or negative. Our actual claims experience will emerge many years after assumptions have been established. The risk of a deviation of the actual interest, morbidity, mortality, and maintenance expense assumptions from those assumed in our reserves are particularly significant to our closed block of long-term care insurance policies. We monitor the loss experience of these long-term care insurance policies, and, when necessary, apply for premium rate increases through a regulatory filing and approval process in the jurisdictions in which such products were sold. However, to the extent premium rate increases or loss experience vary from the assumptions we have locked in, additional future adjustments to reserves could be required.

While we proactively attempt to effectively manage our operating expenses, increases or decreases in staff-related expenses, additional investment in new products (including our opportunities in the Medicare programs, state-based contracts, participation in health insurance exchanges, and expansion of clinical capabilities as part of our integrated care delivery model), investments in health and well-being product offerings, acquisitions, new taxes and assessments (including the non-deductible health insurance industry fee and other assessments under the Health Care Reform Law), and implementation of regulatory requirements may increase our operating expenses.

Failure to adequately price our products or estimate sufficient benefits payable or future policy benefits payable, or effectively manage our operating expenses, may result in a material adverse effect on our results of operations, financial position, and cash flows.

We are in a highly competitive industry. Some of our competitors are more established in the health care industry in terms of a larger market share and have greater financial resources than we do in some markets. In addition, other companies may enter our markets in the future, including emerging competitors in the Medicare program or competitors in the delivery of health care services. We may also face increased competition due to participation by other insurers in the health insurance exchanges implemented under the Health Care Reform Law. We believe that barriers to entry in our markets are not substantial, so the addition of new competitors can occur relatively easily, and customers enjoy significant flexibility in moving between competitors. Contracts for the sale of commercial products are generally bid upon or renewed annually. While health plans compete on the basis of many factors, including service and the quality and depth of provider networks, we expect that price will continue to be a significant basis of competition. In addition to the challenge of controlling health care costs, we face intense competitive pressure to contain premium prices. Factors such as business consolidations, strategic alliances, legislative reform, and marketing practices create pressure to contain premium price increases, despite being faced with increasing medical costs.

The policies and decisions of the federal and state governments regarding the Medicare, military, Medicaid and health insurance exchange programs in which we participate have a substantial impact on our profitability. These governmental policies and decisions, which we cannot predict with certainty, directly shape the premiums or other revenues to us under the programs, the eligibility and enrollment of our members, the services we provide to our members, and our administrative, health care services, and other costs associated with these programs. Legislative or regulatory actions, such as those resulting in a reduction in premium payments to us, an increase in our cost of administrative and health care services, or additional fees, taxes or assessments, may have a material adverse effect on our results of operations, financial position, and cash flows.

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Premium increases, introduction of new product designs, and our relationships with our providers in various markets, among other issues, could also affect our membership levels. Other actions that could affect membership levels include our possible exit from or entrance into Medicare or commercial markets, or the termination of a large contract.

If we do not compete effectively in our markets, if we set rates too high or too low in highly competitive markets to keep or increase our market share, if membership does not increase as we expect, if membership declines, or if we lose membership with favorable medical cost experience while retaining or increasing membership with unfavorable medical cost experience, our results of operations, financial position, and cash flows may be materially adversely affected.

If we fail to effectively implement our operational and strategic initiatives, including our Medicare initiatives, our state-based contracts strategy, and our participation in the new health insurance exchanges, our business may be materially adversely affected, which is of particular importance given the concentration of our revenues in these products.

Our future performance depends in large part upon our ability to execute our strategy, including opportunities created by the expansion of our Medicare programs, the successful implementation of our integrated care delivery model, our strategy with respect to state-based contracts, including those covering members dually eligible for the Medicare and Medicaid programs, and our participation in health insurance exchanges.

We have made substantial investments in the Medicare program to enhance our ability to participate in these programs. We have increased the size of our Medicare geographic reach through expanded Medicare product offerings. We offer both stand-alone Medicare prescription drug coverage and Medicare Advantage health plans with prescription drug coverage in addition to our other product offerings. We offer a Medicare prescription drug plan in 50 states as well as Puerto Rico and the District of Columbia. The growth of our Medicare products is an important part of our business strategy. Any failure to achieve this growth may have a material adverse effect on our results of operations, financial position, or cash flows. In addition, the expansion of our Medicare products in relation to our other businesses may intensify the risks to us inherent in Medicare products. There is significant concentration of our revenues in Medicare products, with approximately 72% of our total premiums and services revenue for the year ended December 31, 2015 generated from our Medicare products, including 14% derived from our individual Medicare Advantage contracts with CMS in Florida. These expansion efforts may result in less diversification of our revenue stream and increased risks associated with operating in a highly regulated industry, as discussed further below.

The recently implemented Health Care Reform Law created a federal Medicare-Medicaid Coordination Office to serve dual eligibles. This Medicare-Medicaid Coordination Office has initiated a series of state demonstration projects to experiment with better coordination of care between Medicare and Medicaid. Depending upon the results of those demonstration projects, CMS may change the way in which dual eligibles are serviced. If we are unable to implement our strategic initiatives to address the dual eligibles opportunity, including our participation in state-based contracts, or if our initiatives are not successful at attracting or retaining dual eligible members, our business may be materially adversely affected.

Additionally, our strategy includes the growth of our commercial products, including participation in certain health insurance exchanges, introduction of new products and benefit designs, including HumanaVitality and other wellness products, growth of our specialty products such as dental, vision and other supplemental products, the adoption of new technologies, development of adjacent businesses, and the integration of acquired businesses and contracts.

There can be no assurance that we will be able to successfully implement our operational and strategic initiatives, including implementing our integrated care delivery model, that are intended to position us for future growth or that the products we design will be accepted or adopted in the time periods assumed. Failure to implement this strategy may result in a material adverse effect on our results of operations, financial position, and cash flows.

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If we fail to properly maintain the integrity of our data, to strategically implement new information systems, or to protect our proprietary rights to our systems, our business may be materially adversely affected.

Our business depends significantly on effective information systems and the integrity and timeliness of the data we use to run our business. Our business strategy involves providing members and providers with easy to use products that leverage our information to meet their needs. Our ability to adequately price our products and services, provide effective and efficient service to our customers, and to timely and accurately report our financial results depends significantly on the integrity of the data in our information systems. As a result of our past and on-going acquisition activities, we have acquired additional information systems. We have reduced the number of systems we operate, have upgraded and expanded our information systems capabilities, and are gradually migrating existing business to fewer systems. Our information systems require an ongoing commitment of significant resources to maintain, protect, and enhance existing systems and develop new systems to keep pace with continuing changes in information processing technology, evolving industry and regulatory standards, and changing customer preferences. If the information we rely upon to run our businesses was found to be inaccurate or unreliable or if we fail to maintain effectively our information systems and data integrity, we could have operational disruptions, have problems in determining medical cost estimates and establishing appropriate pricing, have customer and physician and other health care provider disputes, have regulatory or other legal problems, have increases in operating expenses, lose existing customers, have difficulty in attracting new customers, or suffer other adverse consequences.

We depend on independent third parties for significant portions of our systems-related support, equipment, facilities, and certain data, including data center operations, data network, voice communication services and pharmacy data processing. This dependence makes our operations vulnerable to such third parties' failure to perform adequately under the contract, due to internal or external factors. A change in service providers could result in a decline in service quality and effectiveness or less favorable contract terms which may adversely affect our operating results.

We rely on our agreements with customers, confidentiality agreements with employees, and our trade secrets and copyrights to protect our proprietary rights. These legal protections and precautions may not prevent misappropriation of our proprietary information. In addition, substantial litigation regarding intellectual property rights exists in the software industry, including litigation involving end users of software products. We expect software products to be increasingly subject to third-party infringement claims as the number of products and competitors in this area grows.

There can be no assurance that our information technology, or IT, process will successfully improve existing systems, develop new systems to support our expanding operations, integrate new systems, protect our proprietary information, defend against cybersecurity attacks, or improve service levels. In addition, there can be no assurance that additional systems issues will not arise in the future. Failure to adequately protect and maintain the integrity of our information systems and data, or to defend against cybersecurity attacks, may result in a material adverse effect on our results of operations, financial position, and cash flows.

If we are unable to defend our information technology security systems against cybersecurity attacks or prevent other privacy or data security incidents that result in security breaches that disrupt our operations or in the unintended dissemination of sensitive personal information or proprietary or confidential information, we could be exposed to significant regulatory fines or penalties, liability or reputational damage, or experience a material adverse effect on our results of operations, financial position, and cash flows.

In the ordinary course of our business, we process, store and transmit large amounts of data, including sensitive personal information as well as proprietary or confidential information relating to our business or a third-party. A cybersecurity attack may penetrate our layered security controls and misappropriate or compromise sensitive personal information or proprietary or confidential information or that of third-parties, create system disruptions, cause shutdowns, or deploy viruses, worms, and other malicious software programs that attack our systems. A cybersecurity attack that bypasses our IT security systems successfully could materially affect us due to the theft, destruction, loss, misappropriation or release of confidential data or intellectual property, operational or business delays resulting from the disruption of our IT systems, or negative publicity resulting in reputation or brand damage with our members, customers, providers, and other stakeholders.

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The costs to eliminate or address cybersecurity threats and vulnerabilities before or after an incident could be substantial. Our remediation efforts may not be successful and could result in interruptions, delays, or cessation of service, and loss of existing or potential members. In addition, breaches of our security measures and the unauthorized dissemination of sensitive personal information or proprietary or confidential information about us or our members or other third-parties, could expose our members’ private information and result in the risk of financial or medical identity theft, or expose us or other third-parties to a risk of loss or misuse of this information, result in significant regulatory fines or penalties, litigation and potential liability for us, damage our brand and reputation, or otherwise harm our business.

Our business may be materially adversely impacted by the adoption of a new coding set for diagnoses.

Federal regulations related to the Health Insurance Portability and Accountability Act of 1996, as amended (HIPAA), contain minimum standards for electronic transactions and code sets, and for the privacy and security of protected health information. On October 1, 2015, ICD-10, the current system of assigning codes to diagnoses and procedures associated with hospital utilization in the United States, replaced the prior set of codes. For dates of service on or after October 1, 2015, health plans and providers are required to use ICD-10 codes for such diagnoses and procedures. While we prepared for the transition to ICD-10, if unforeseen circumstances arise, it is possible that we could be exposed to investigations and allegations of noncompliance, which could have a material adverse effect on our results of operations, financial position and cash flows. In addition, if some providers continue to use ICD-9 codes on claims after October 1, 2015, including providers in our network who are employees, we will have to reject such claims, which may lead to claim resubmissions, increased call volume and provider and customer dissatisfaction. Further, providers may use ICD-10 codes differently than they used ICD-9 codes in the past, which could result in increased claim submissions or lost revenues under risk adjustment. During the transition to ICD-10, certain claims processing and payment information we have historically used to establish our reserves may not be reliable or available in a timely manner. If we do not adequately implement the new ICD-10 coding set, or if providers in our network do not adequately transition to the new ICD-10 coding set, our results of operations, financial position and cash flows may be materially adversely affected.

We are involved in various legal actions and governmental and internal investigations, any of which, if resolved unfavorably to us, could result in substantial monetary damages or changes in our business practices. Increased litigation and negative publicity could increase our cost of doing business.

We are or may become a party to a variety of legal actions that affect our business, including breach of contract actions, employment and employment discrimination-related suits, employee benefit claims, stockholder suits and other securities laws claims, and tort claims.

In addition, because of the nature of the health care business, we are subject to a variety of legal actions relating to our business operations, including the design, management, and offering of products and services. These include and could include in the future:

• claims relating to the methodologies for calculating premiums;

• claims relating to the denial of health care benefit payments;

• claims relating to the denial or rescission of insurance coverage;

• challenges to the use of some software products used in administering claims;

• claims relating to our administration of our Medicare Part D offerings;

• medical malpractice actions based on our medical necessity decisions or brought against us on the theory that we are liable for providers' alleged malpractice;

• claims arising from any adverse medical consequences resulting from our recommendations about the appropriateness of providers’ proposed medical treatment plans for patients;

• allegations of anti-competitive and unfair business activities;

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• provider disputes over compensation or non-acceptance or termination of provider contracts or provider contract disputes relating to rate adjustments resulting from the Balance Budget and Emergency Deficit Control Act of 1985, as amended (commonly referred to as “sequestration”);

• disputes related to ASO business, including actions alleging claim administration errors;

• qui tam litigation brought by individuals who seek to sue on behalf of the government, alleging that we, as a government contractor, submitted false claims to the government including, among other allegations, resulting from coding and review practices under the Medicare risk-adjustment model;

• claims related to the failure to disclose some business practices;

• claims relating to customer audits and contract performance;

• claims relating to dispensing of drugs associated with our in-house mail-order pharmacy; and

• professional liability claims arising out of the delivery of healthcare and related services to the public.

In some cases, substantial non-economic or punitive damages as well as treble damages under the federal False Claims Act, Racketeer Influenced and Corrupt Organizations Act and other statutes may be sought.

While we currently have insurance coverage for some of these potential liabilities, other potential liabilities may not be covered by insurance, insurers may dispute coverage, or the amount of our insurance may not be enough to cover the damages awarded. In addition, some types of damages, like punitive damages, may not be covered by insurance. In some jurisdictions, coverage of punitive damages is prohibited. Insurance coverage for all or some forms of liability may become unavailable or prohibitively expensive in the future.

The health benefits industry continues to receive significant negative publicity reflecting the public perception of the industry. This publicity and perception have been accompanied by increased litigation, including some large jury awards, legislative activity, regulation, and governmental review of industry practices. These factors may materially adversely affect our ability to market our products or services, may require us to change our products or services or otherwise change our business practices, may increase the regulatory burdens under which we operate, and may require us to pay large judgments or fines. Any combination of these factors could further increase our cost of doing business and adversely affect our results of operations, financial position, and cash flows.

See "Legal Proceedings and Certain Regulatory Matters" in Note 16 to the consolidated financial statements included in Item 8. - Financial Statements and Supplementary Data. We cannot predict the outcome of these matters with certainty.

As a government contractor, we are exposed to risks that may materially adversely affect our business or our willingness or ability to participate in government health care programs.

A significant portion of our revenues relates to federal and state government health care coverage programs, including the Medicare, military, and Medicaid programs. These programs accounted for approximately 73% of our total premiums and services revenue for the year ended December 31, 2015. These programs involve various risks, as described further below.

• At December 31, 2015, under our contracts with CMS we provided health insurance coverage to approximately 587,400 individual Medicare Advantage members in Florida. These contracts accounted for approximately 14% of our total premiums and services revenue for the year ended December 31, 2015. The loss of these and other CMS contracts or significant changes in the Medicare program as a result of legislative or regulatory action, including reductions in premium payments to us or increases in member benefits without corresponding increases in premium payments to us, may have a material adverse effect on our results of operations, financial position, and cash flows.

• At December 31, 2015, our military services business primarily consisted of the TRICARE South Region contract which covers approximately 3,074,400 beneficiaries. For the year ended December 31, 2015,

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premiums and services revenue associated with the TRICARE South Region contract accounted for approximately 1% of our total premiums and services revenue. On April 1, 2012, we began delivering services under the current TRICARE South Region contract that the Defense Health Agency, or DHA (formerly known as the TRICARE Management Activity), awarded to us on February 25, 2011. The current 5-year South Region contract, which expires March 31, 2017, is subject to annual renewals on April 1 of each year during its term at the government’s option. On January 22, 2016, we received notice from the DHA of its intent to exercise its option to extend the TRICARE South Region contract through March 31, 2017. The loss of the TRICARE South Region contract, should it occur, may have a material adverse effect on our results of operations, financial position, and cash flows.

• There is a possibility of temporary or permanent suspension from participating in government health care programs, including Medicare and Medicaid, if we are convicted of fraud or other criminal conduct in the performance of a health care program or if there is an adverse decision against us under the federal False Claims Act. As a government contractor, we may be subject to qui tam litigation brought by individuals who seek to sue on behalf of the government, alleging that the government contractor submitted false claims to the government. Litigation of this nature is filed under seal to allow the government an opportunity to investigate and to decide if it wishes to intervene and assume control of the litigation. If the government does not intervene, the lawsuit is unsealed, and the individual may continue to prosecute the action on his or her own.

• CMS uses a risk-adjustment model which apportions premiums paid to Medicare Advantage, or MA, plans according to health severity of covered members. The risk-adjustment model pays more for enrollees with predictably higher costs. Under this model, rates paid to MA plans are based on actuarially determined bids, which include a process whereby our prospective payments are based on a comparison of our beneficiaries’ risk scores, derived from medical diagnoses, to those enrolled in the government’s traditional fee-for-service Medicare program (referred to as "Medicare FFS"). Under the risk-adjustment methodology, all MA plans must collect and submit the necessary diagnosis code information from hospital inpatient, hospital outpatient, and physician providers to CMS within prescribed deadlines. The CMS risk-adjustment model uses the diagnosis data to calculate the risk-adjusted premium payment to MA plans, which CMS adjusts for coding pattern differences between the health plans and the government fee-for-service program. We generally rely on providers, including certain providers in our network who are our employees, to code their claim submissions with appropriate diagnoses, which we send to CMS as the basis for our payment received from CMS under the actuarial risk-adjustment model. We also rely on these providers to document appropriately all medical data, including the diagnosis data submitted with claims. In addition, we conduct medical record reviews as part of our data and payment accuracy compliance efforts, to more accurately reflect diagnosis conditions under the risk adjustment model. These compliance efforts include the internal contract level audits described in more detail below.

CMS is continuing to perform audits of various companies’ selected MA contracts related to this risk adjustment diagnosis data. We refer to these audits as Risk-Adjustment Data Validation Audits, or RADV audits. RADV audits review medical records in an attempt to validate provider medical record documentation and coding practices which influence the calculation of premium payments to MA plans.

In 2012, CMS released a “Notice of Final Payment Error Calculation Methodology for Part C Medicare Advantage Risk Adjustment Data Validation (RADV) Contract-Level Audits.” The payment error calculation methodology provides that, in calculating the economic impact of audit results for an MA contract, if any, the results of the audit sample will be extrapolated to the entire MA contract based upon a comparison to “benchmark” audit data in Medicare FFS (which we refer to as the "FFS Adjuster"). This comparison to the FFS Adjuster is necessary to determine the economic impact, if any, of audit results because the government program data set, including any attendant errors that are present in that data set, provides the basis for MA plans’ risk adjustment to payment rates. CMS already makes other adjustments to payment rates based on a comparison of coding pattern differences between MA plans and Medicare FFS data (such as for frequency of coding for certain diagnoses in MA plan data versus the government program data set).

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The final methodology, including the first application of extrapolated audit results to determine audit settlements, is expected to be applied to RADV contract level audits currently being conducted for contract year 2011 in which two of our Medicare Advantage plans are being audited. Per CMS guidance, selected MA contracts will be notified of an audit at some point after the close of the final reconciliation for the payment year being audited. The final reconciliation occurs in August of the calendar year following the payment year. We were notified on September 15, 2015, that five of our Medicare Advantage contracts have been selected for audit for contract year 2012.

Estimated audit settlements are recorded as a reduction of premiums revenue in our consolidated statements of income, based upon available information. We perform internal contract level audits based on the RADV audit methodology prescribed by CMS. Included in these internal contract level audits is an audit of our Private Fee-For-Service business which we used to represent a proxy of the FFS Adjuster which has not yet been released. We based our accrual of estimated audit settlements for each contract year on the results of these internal contract level audits and update our estimates as each audit is completed. Estimates derived from these results were not material to our results of operations, financial position, or cash flows. However, as indicated, we are awaiting additional guidance from CMS regarding the FFS Adjuster. Accordingly, we cannot determine whether such RADV audits will have a material adverse effect on our results of operations, financial position, or cash flows.

In addition, CMS' comments in formalized guidance regarding “overpayments” to MA plans appear to be inconsistent with CMS' prior RADV audit guidance. These statements, contained in the preamble to CMS’ final rule release regarding Medicare Advantage and Part D prescription drug benefit program regulations for Contract Year 2015, appear to equate each Medicare Advantage risk adjustment data error with an “overpayment” without reconciliation to the principles underlying the FFS Adjuster referenced above. We will continue to work with CMS to ensure that MA plans are paid accurately and that payment model principles are in accordance with the requirements of the Social Security Act, which, if not implemented correctly could have a material adverse effect on our results of operations, financial position, or cash flows.

• Our CMS contracts which cover members’ prescription drugs under Medicare Part D contain provisions for risk sharing and certain payments for prescription drug costs for which we are not at risk. These provisions, certain of which are described below, affect our ultimate payments from CMS.

The premiums from CMS are subject to risk corridor provisions which compare costs targeted in our annual bids to actual prescription drug costs, limited to actual costs that would have been incurred under the standard coverage as defined by CMS. Variances exceeding certain thresholds may result in CMS making additional payments to us or require us to refund to CMS a portion of the premiums we received (known as a “risk corridor”). We estimate and recognize an adjustment to premiums revenue related to the risk corridor payment settlement based upon pharmacy claims experience. The estimate of the settlement associated with these risk corridor provisions requires us to consider factors that may not be certain, including member eligibility differences with CMS. Our estimate of the settlement associated with the Medicare Part D risk corridor provisions was a net payable of $22 million at December 31, 2015.

Reinsurance and low-income cost subsidies represent payments from CMS in connection with the Medicare Part D program for which we assume no risk. Reinsurance subsidies represent payments for CMS’s portion of claims costs which exceed the member’s out-of-pocket threshold, or the catastrophic coverage level. Low-income cost subsidies represent payments from CMS for all or a portion of the deductible, the coinsurance and co-payment amounts above the out-of-pocket threshold for low-income beneficiaries. Monthly prospective payments from CMS for reinsurance and low-income cost subsidies are based on assumptions submitted with our annual bid. A reconciliation and settlement of CMS’s prospective subsidies against actual prescription drug costs we paid is made after the end of the year.

Settlement of the reinsurance and low-income cost subsidies as well as the risk corridor payment is based on a reconciliation made approximately 9 months after the close of each calendar year. This reconciliation process requires us to submit claims data necessary for CMS to administer the program. Our claims data may not pass CMS’s claims edit processes due to various reasons, including discrepancies in eligibility or classification of low-income members. To the extent our data does not pass CMS’s claim edit processes,

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we may bear the risk for all or a portion of the claim which otherwise may have been subject to the risk corridor provision or payment which we would have otherwise received as a low-income subsidy or reinsurance claim. In addition, in the event the settlement represents an amount CMS owes us, there is a negative impact on our cash flows and financial condition as a result of financing CMS’s share of the risk. The opposite is true in the event the settlement represents an amount we owe CMS.

• The Budget Control Act of 2011 increased the United States debt ceiling conditioned on deficit reductions to be achieved over the next ten years. The Budget Control Act of 2011 also established a twelve-member joint committee of Congress known as the Joint Select Committee on Deficit Reduction to propose legislation to reduce the United States federal deficit by $1.5 trillion for fiscal years 2012-2021. The failure of the Joint Select Committee on Deficit Reduction to achieve a targeted deficit reduction by December 23, 2011 triggered an automatic reduction, including aggregate reductions to Medicare payments to providers of up to 2 percent per fiscal year. These reductions took effect on April 1, 2013, and the Bipartisan Budget Act of 2013, enacted on December 26, 2013, extended the reductions for two years. We expect a corresponding substantial reduction in our obligations to providers. Due to the uncertainty around the application of any such reductions, there can be no assurances that we can completely offset any reductions to the Medicare healthcare programs applied by the Budget Control Act of 2011.

• We are also subject to various other governmental audits and investigations. Under state laws, our HMOs and health insurance companies are audited by state departments of insurance for financial and contractual compliance. Our HMOs are audited for compliance with health services by state departments of health. Audits and investigations are also conducted by state attorneys general, CMS, the Office of the Inspector General of Health and Human Services, the Office of Personnel Management, the Department of Justice, the Department of Labor, and the Defense Contract Audit Agency. All of these activities could result in the loss of licensure or the right to participate in various programs, including a limitation on our ability to market or sell products, the imposition of fines, penalties and other civil and criminal sanctions, or changes in our business practices. The outcome of any current or future governmental or internal investigations cannot be accurately predicted, nor can we predict any resulting penalties, fines or other sanctions that may be imposed at the discretion of federal or state regulatory authorities. Nevertheless, it is reasonably possible that any such outcome of litigation, penalties, fines or other sanctions could be substantial, and the outcome of these matters may have a material adverse effect on our results of operations, financial position, and cash flows. Certain of these matters could also affect our reputation. In addition, disclosure of any adverse investigation or audit results or sanctions could negatively affect our industry or our reputation in various markets and make it more difficult for us to sell our products and services.

The Patient Protection and Affordable Care Act and The Health Care and Education Reconciliation Act of 2010 could have a material adverse effect on our results of operations (including restricting revenue, enrollment and premium growth in certain products and market segments, restricting our ability to expand into new markets,increasing our medical and operating costs by, among other things, requiring a minimum benefit ratio on insured products, lowering our Medicare payment rates and increasing our expenses associated with a non-deductible health insurance industry fee and other assessments); our financial position (including our ability to maintain the value of our goodwill); and our cash flows.

The Patient Protection and Affordable Care Act and The Health Care and Education Reconciliation Act of 2010 (which we collectively refer to as the Health Care Reform Law) enacted significant reforms to various aspects of the U.S. health insurance industry. The provisions of the Health Care Reform Law include, among others, imposing a significant new non-deductible health insurance industry fee and other assessments on health insurers, limiting Medicare Advantage payment rates, stipulating a prescribed minimum ratio for the amount of premiums revenue to be expended on medical costs for insured products, additional mandated benefits and guarantee issuance associated with commercial medical insurance, requirements that limit the ability of health plans to vary premiums based on assessments of underlying risk, and heightened scrutiny by state and federal regulators of our business practices, including our Medicare bid and pricing practices. The Health Care Reform Law also specifies benefit design guidelines, limits rating and pricing practices, encourages additional competition (including potential incentives for new market entrants), establishes federally-facilitated or state-based exchanges for individuals and small employers (with up to 100 employees) coupled

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with programs designed to spread risk among insurers (subject to federal administrative action), and expands eligibility for Medicaid programs (subject to state-by-state implementation of this expansion). In addition, the Health Care Reform Law has increased and will continue to increase federal oversight of health plan premium rates and could adversely affect our ability to appropriately adjust health plan premiums on a timely basis. Financing for these reforms will come, in part, from material additional fees and taxes on us and other health plans and individuals which began in 2014, as well as reductions in certain levels of payments to us and other health plans under Medicare. If we fail to effectively implement our operational and strategic initiatives with respect to the implementation of the Health Care Reform Law, our business may be materially adversely affected. For additional information, please refer to the section entitled, “Health Care Reform” in “Item 7 - Management’s Discussion and Analysis of Financial Condition and Results of Operations” appearing in this annual report.

Our participation in the new federal and state health insurance exchanges, which entail uncertainties associated with mix, volume of business and the operation of premium stabilization programs, which are subject to federal administrative action, could adversely affect our results of operations, financial position, and cash flows.

The Health Care Reform Law required the establishment of health insurance exchanges for individuals and small employers to purchase health insurance that became effective January 1, 2014, with an annual open enrollment period. Insurers participating on the health insurance exchanges must offer a minimum level of benefits and are subject to guidelines on setting premium rates and coverage limitations. We may be adversely selected by individuals who have a higher acuity level than the anticipated pool of participants in this market. In addition, the risk corridor, reinsurance, and risk adjustment provisions of the Health Care Reform Law, established to apportion risk for insurers, may not be effective in appropriately mitigating the financial risks related to our products. During 2015, we received our interim settlement associated with our risk corridor receivables for the 2014 coverage year. The interim settlement, representing only 12.6% of risk corridor receivables for the 2014 coverage year, was funded by HHS in accordance with previous guidance, utilizing funds HHS collected from us and other carriers under the 2014 risk corridor program.HHS provided guidance under the three year risk corridor program that future collections will first be applied to any shortfalls from previous coverage years before application to current year obligations. Risk corridor payables to issuers are obligations of the United States Government under the Health Care Reform law which requires the Secretary of HHS to make full payments to issuers. In the event of a shortfall at the end of the three year program, HHS has asserted it will explore other sources of funding for risk corridor payments, subject to the availability of appropriations. In addition, regulatory changes to the implementation of the Health Care Reform Law that allowed individuals to remain in plans that are not compliant with the Health Care Reform Law or to enroll outside of the annual enrollment period may have an adverse effect on our pool of participants in the health insurance exchange. All of these factors may have a material adverse effect on our results of operations, financial position, or cash flows if our premiums are not adequate or do not appropriately reflect the acuity of these individuals. Any variation from our expectations regarding acuity, enrollment levels, adverse selection, or other assumptions used in setting premium rates could have a material adverse effect on our results of operations, financial position, and cash flows.

Our business activities are subject to substantial government regulation. New laws or regulations, or changes in existing laws or regulations or their manner of application, including reductions in Medicare Advantage payment rates, could increase our cost of doing business and may adversely affect our business, profitability, financial condition, and cash flows.

In addition to the Health Care Reform Law, the health care industry in general and health insurance are subject to substantial federal and state government regulation:

Health Insurance Portability and Accountability Act (HIPAA) and the Health Information Technology for Economic and Clinical Health Act (HITECH Act)

The use of individually identifiable health data by our business is regulated at federal and state levels. These laws and rules are changed frequently by legislation or administrative interpretation. Various state laws address the use and maintenance of individually identifiable health data. Most are derived from the privacy provisions in the federal Gramm-Leach-Bliley Act and the Health Insurance Portability and Accountability Act, or HIPAA. HIPAA includes

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administrative provisions directed at simplifying electronic data interchange through standardizing transactions, establishing uniform health care provider, payer, and employer identifiers, and seeking protections for confidentiality and security of patient data. The rules do not provide for complete federal preemption of state laws, but rather preempt all inconsistent state laws unless the state law is more stringent.

These regulations set standards for the security of electronic health information. Violations of these rules could subject us to significant criminal and civil penalties, including significant monetary penalties. Compliance with HIPAA regulations requires significant systems enhancements, training and administrative effort. HIPAA can also expose us to additional liability for violations by our business associates (e.g., entities that provide services to health plans and providers).

The HITECH Act, one part of the American Recovery and Reinvestment Act of 2009, significantly broadened the scope of the privacy and security regulations of HIPAA. Among other requirements, the HITECH Act and HIPAA mandate individual notification in the event of a breach of unsecured, individually identifiable health information, provides enhanced penalties for HIPAA violations, requires business associates to comply with certain provisions of the HIPAA privacy and security rule, and grants enforcement authority to state attorneys general in addition to the HHS Office of Civil Rights.

In addition, there are numerous federal and state laws and regulations addressing patient and consumer privacy concerns, including unauthorized access or theft of personal information. State statutes and regulations vary from state to state and could impose additional penalties. Violations of HIPAA or applicable federal or state laws or regulations could subject us to significant criminal or civil penalties, including significant monetary penalties. Compliance with HIPAA and other privacy regulations requires significant systems enhancements, training and administrative effort.

American Recovery and Reinvestment Act of 2009 (ARRA)

On February 17, 2009, the American Recovery and Reinvestment Act of 2009, or ARRA, was enacted into law. In addition to including a temporary subsidy for health care continuation coverage issued pursuant to the Consolidated Omnibus Budget Reconciliation Act, or COBRA, ARRA also expands and strengthens the privacy and security provisions of HIPAA and imposes additional limits on the use and disclosure of protected health information, or PHI. Among other things, ARRA requires us and other covered entities to report any unauthorized release or use of or access to PHI to any impacted individuals and to the U.S. Department of Health and Human Services in those instances where the unauthorized activity poses a significant risk of financial, reputational or other harm to the individuals, and to notify the media in any states where 500 or more people are impacted by any unauthorized release or use of or access to PHI. ARRA also requires business associates to comply with certain HIPAA provisions. ARRA also establishes higher civil and criminal penalties for covered entities and business associates who fail to comply with HIPAA’s provisions and requires the U.S. Department of Health and Human Services to issue regulations implementing its privacy and security enhancements. 

Corporate Practice of Medicine and Other Laws

As a corporate entity, Humana Inc. is not licensed to practice medicine. Many states in which we operate through our subsidiaries limit the practice of medicine to licensed individuals or professional organizations comprised of licensed individuals, and business corporations generally may not exercise control over the medical decisions of physicians. Statutes and regulations relating to the practice of medicine, fee-splitting between physicians and referral sources, and similar issues vary widely from state to state. Under management agreements between certain of our subsidiaries and affiliated physician-owned professional groups, these groups retain sole responsibility for all medical decisions, as well as for hiring and managing physicians and other licensed healthcare providers, developing operating policies and procedures, implementing professional standards and controls, and maintaining malpractice insurance. We believe that our health services operations comply with applicable state statutes regarding corporate practice of medicine, fee-splitting, and similar issues. However, any enforcement actions by governmental officials alleging non-compliance with these statutes, which could subject us to penalties or restructuring or reorganization of our business, may result in a material adverse effect on our results of operations, financial position, or cash flows.

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Anti-Kickback, Physician Self-Referral, and Other Fraud and Abuse Laws

A federal law commonly referred to as the “Anti-Kickback Statute” prohibits the offer, payment, solicitation, or receipt of any form of remuneration to induce, or in return for, the referral of Medicare or other governmental health program patients or patient care opportunities, or in return for the purchase, lease, or order of items or services that are covered by Medicare or other federal governmental health programs. Because the prohibitions contained in the Anti-Kickback Statute apply to the furnishing of items or services for which payment is made in “whole or in part,” the Anti-Kickback Statute could be implicated if any portion of an item or service we provide is covered by any of the state or federal health benefit programs described above. Violation of these provisions constitutes a felony criminal offense and applicable sanctions could include exclusion from the Medicare and Medicaid programs.

Section 1877 of the Social Security Act, commonly known as the “Stark Law,” prohibits physicians, subject to certain exceptions described below, from referring Medicare or Medicaid patients to an entity providing “designated health services” in which the physician, or an immediate family member, has an ownership or investment interest or with which the physician, or an immediate family member, has entered into a compensation arrangement. These prohibitions, contained in the Omnibus Budget Reconciliation Act of 1993, commonly known as “Stark II,” amended prior federal physician self-referral legislation known as “Stark I” by expanding the list of designated health services to a total of 11 categories of health services. The professional groups with which we are affiliated provide one or more of these designated health services. Persons or entities found to be in violation of the Stark Law are subject to denial of payment for services furnished pursuant to an improper referral, civil monetary penalties, and exclusion from the Medicare and Medicaid programs.

Many states also have enacted laws similar in scope and purpose to the Anti-Kickback Statute and, in more limited instances, the Stark Law, that are not limited to services for which Medicare or Medicaid payment is made. In addition, most states have statutes, regulations, or professional codes that restrict a physician from accepting various kinds of remuneration in exchange for making referrals. These laws vary from state to state and have seldom been interpreted by the courts or regulatory agencies. In states that have enacted these statutes, we believe that regulatory authorities and state courts interpreting these statutes may regard federal law under the Anti-Kickback Statute and the Stark Law as persuasive.

We believe that our operations comply with the Anti-Kickback Statute, the Stark Law, and similar federal or state laws addressing fraud and abuse. These laws are subject to modification and changes in interpretation, and are enforced by authorities vested with broad discretion. We continually monitor developments in this area. If these laws are interpreted in a manner contrary to our interpretation or are reinterpreted or amended, or if new legislation is enacted with respect to healthcare fraud and abuse, illegal remuneration, or similar issues, we may be required to restructure our affected operations to maintain compliance with applicable law. There can be no assurances that any such restructuring will be possible or, if possible, would not have a material adverse effect on our results of operations, financial position, or cash flows.

Environmental

We are subject to various federal, state, and local laws and regulations relating to the protection of human health and the environment. If an environmental regulatory agency finds any of our facilities to be in violation of environmental laws, penalties and fines may be imposed for each day of violation and the affected facility could be forced to cease operations. We could also incur other significant costs, such as cleanup costs or claims by third parties, as a result of violations of, or liabilities under, environmental laws. Although we believe that our environmental practices, including waste handling and disposal practices, are in material compliance with applicable laws, future claims or violations, or changes in environmental laws, could have a material adverse effect on our results of operations, financial position or cash flows.

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State Regulation of Insurance-Related Products

Laws in each of the states (and Puerto Rico) in which we operate our HMOs, PPOs and other health insurance-related services regulate our operations including: capital adequacy and other licensing requirements, policy language describing benefits, mandated benefits and processes, entry, withdrawal or re-entry into a state or market, rate increases, delivery systems, utilization review procedures, quality assurance, complaint systems, enrollment requirements, claim payments, marketing, and advertising. The HMO, PPO, and other health insurance-related products we offer are sold under licenses issued by the applicable insurance regulators.

Our licensed insurance subsidiaries are also subject to regulation under state insurance holding company and Puerto Rico regulations. These regulations generally require, among other things, prior approval and/or notice of new products, rates, benefit changes, and certain material transactions, including dividend payments, purchases or sales of assets, intercompany agreements, and the filing of various financial and operational reports.

Any failure by us to manage acquisitions, divestitures and other significant transactions successfully may have a material adverse effect on our results of operations, financial position, and cash flows.

As part of our business strategy, we frequently engage in discussions with third parties regarding possible investments, acquisitions, divestitures, strategic alliances, joint ventures, and outsourcing transactions and often enter into agreements relating to such transactions in order to further our business objectives. In order to pursue our acquisition strategy successfully, we must identify suitable candidates for and successfully complete transactions, some of which may be large and complex, and manage post-closing issues such as the integration of acquired companies or employees. Integration and other risks can be more pronounced for larger and more complicated transactions, transactions outside of our core business space, or if multiple transactions are pursued simultaneously. The failure to successfully integrate acquired entities and businesses or failure to produce results consistent with the financial model used in the analysis of our acquisitions may have a material adverse effect on our results of operations, financial position, and cash flows. If we fail to identify and complete successfully transactions that further our strategic objectives, we may be required to expend resources to develop products and technology internally. In addition, from time to time, we evaluate alternatives for our businesses that do not meet our strategic, growth or profitability objectives. The divestiture of certain businesses could result, individually or in the aggregate, in the recognition of material losses and a material adverse effect on our results of operations. There can be no assurance that we will be able to complete any such divestitures on terms favorable to us.

If we fail to develop and maintain satisfactory relationships with the providers of care to our members, our business may be adversely affected.

We employ or contract with physicians, hospitals and other providers to deliver health care to our members. Our products encourage or require our customers to use these contracted providers. A key component of our integrated care delivery strategy is to increase the number of providers who share medical cost risk with us or have financial incentives to deliver quality medical services in a cost-effective manner.

In any particular market, providers could refuse to contract with us, demand higher payments, or take other actions that could result in higher health care costs for us, less desirable products for customers and members or difficulty meeting regulatory or accreditation requirements. In some markets, some providers, particularly hospitals, physician specialty groups, physician/hospital organizations, or multi-specialty physician groups, may have significant market positions and negotiating power. In addition, physician or practice management companies, which aggregate physician practices for administrative efficiency and marketing leverage, may compete directly with us. If these providers refuse to contract with us, use their market position to negotiate unfavorable contracts with us or place us at a competitive disadvantage, or do not enter into contracts with us that encourage the delivery of quality medical services in a cost-effective manner, our ability to market products or to be profitable in those areas may be adversely affected.

In some situations, we have contracts with individual or groups of primary care providers for an actuarially determined, fixed fee per month to provide a basket of required medical services to our members. This type of contract

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is referred to as a “capitation” contract. The inability of providers to properly manage costs under these capitation arrangements can result in the financial instability of these providers and the termination of their relationship with us. In addition, payment or other disputes between a primary care provider and specialists with whom the primary care provider contracts can result in a disruption in the provision of services to our members or a reduction in the services available to our members. The financial instability or failure of a primary care provider to pay other providers for services rendered could lead those other providers to demand payment from us even though we have made our regular fixed payments to the primary provider. There can be no assurance that providers with whom we contract will properly manage the costs of services, maintain financial solvency or avoid disputes with other providers. Any of these events may have a material adverse effect on the provision of services to our members and our results of operations, financial position, and cash flows.

Our pharmacy business is highly competitive and subjects us to regulations in addition to those we face with our core health benefits businesses.

Our pharmacy mail order business competes with locally owned drugstores, retail drugstore chains, supermarkets, discount retailers, membership clubs, internet companies and other mail-order and long-term care pharmacies. Our pharmacy business also subjects us to extensive federal, state, and local regulation. The practice of pharmacy is generally regulated at the state level by state boards of pharmacy. Many of the states where we deliver pharmaceuticals, including controlled substances, have laws and regulations that require out-of-state mail-order pharmacies to register with that state’s board of pharmacy. Federal agencies further regulate our pharmacy operations, requiring registration with the U.S. Drug Enforcement Administration and individual state controlled substance authorities in order to dispense controlled substances. In addition, the FDA inspects facilities in connection with procedures to effect recalls of prescription drugs. The Federal Trade Commission also has requirements for mail-order sellers of goods. The U.S. Postal Service, or USPS, has statutory authority to restrict the transmission of drugs and medicines through the mail to a degree that may have an adverse effect on our mail-order operations. The USPS historically has exercised this statutory authority only with respect to controlled substances. If the USPS restricts our ability to deliver drugs through the mail, alternative means of delivery are available to us. However, alternative means of delivery could be significantly more expensive. The Department of Transportation has regulatory authority to impose restrictions on drugs inserted in the stream of commerce. These regulations generally do not apply to the USPS and its operations. In addition, we are subject to CMS rules regarding the administration of our PDP plans and intercompany pricing between our PDP plans and our pharmacy business.

We are also subject to risks inherent in the packaging and distribution of pharmaceuticals and other health care products, and the application of state laws related to the operation of internet and mail-order pharmacies. The failure to adhere to these laws and regulations may expose us to civil and criminal penalties.

Changes in the prescription drug industry pricing benchmarks may adversely affect our financial performance.

Contracts in the prescription drug industry generally use certain published benchmarks to establish pricing for prescription drugs. These benchmarks include average wholesale price, which is referred to as “AWP,” average selling price, which is referred to as “ASP,” and wholesale acquisition cost. It is uncertain whether payors, pharmacy providers, pharmacy benefit managers, or PBMs, and others in the prescription drug industry will continue to utilize AWP as it has previously been calculated, or whether other pricing benchmarks will be adopted for establishing prices within the industry. Legislation may lead to changes in the pricing for Medicare and Medicaid programs. Regulators have conducted investigations into the use of AWP for federal program payment, and whether the use of AWP has inflated drug expenditures by the Medicare and Medicaid programs. Federal and state proposals have sought to change the basis for calculating payment of certain drugs by the Medicare and Medicaid programs. Adoption of ASP in lieu of AWP as the measure for determining payment by Medicare or Medicaid programs for the drugs sold in our mail-order pharmacy business may reduce the revenues and gross margins of this business which may result in a material adverse effect on our results of operations, financial position, and cash flows.

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If we do not continue to earn and retain purchase discounts and volume rebates from pharmaceutical manufacturers at current levels, our gross margins may decline.

We have contractual relationships with pharmaceutical manufacturers or wholesalers that provide us with purchase discounts and volume rebates on certain prescription drugs dispensed through our mail-order and specialty pharmacies. These discounts and volume rebates are generally passed on to clients in the form of steeper price discounts. Changes in existing federal or state laws or regulations or in their interpretation by courts and agencies or the adoption of new laws or regulations relating to patent term extensions, and purchase discount and volume rebate arrangements with pharmaceutical manufacturers, may reduce the discounts or volume rebates we receive and materially adversely impact our results of operations, financial position, and cash flows.

Our ability to obtain funds from certain of our licensed subsidiaries is restricted by state insurance regulations.

Because we operate as a holding company, we are dependent upon dividends and administrative expense reimbursements from our subsidiaries to fund the obligations of Humana Inc., our parent company. Certain of our insurance subsidiaries operate in states that regulate the payment of dividends, loans, administrative expense reimbursements or other cash transfers to Humana Inc., and require minimum levels of equity as well as limit investments to approved securities. The amount of dividends that may be paid to Humana Inc. by these insurance subsidiaries, without prior approval by state regulatory authorities, or ordinary dividends, is limited based on the entity's level of statutory income and statutory capital and surplus. In most states, prior notification is provided before paying a dividend even if approval is not required. Actual dividends paid may vary due to consideration of excess statutory capital and surplus and expected future surplus requirements related to, for example, premium volume and product mix. Dividends from our non-insurance companies such as in our Healthcare Services segment are generally not restricted by Departments of Insurance. In the event that we are unable to provide sufficient capital to fund the obligations of Humana Inc., our results of operations, financial position, and cash flows may be materially adversely affected.

Downgrades in our debt ratings, should they occur, may adversely affect our business, results of operations, and financial condition.

Claims paying ability, financial strength, and debt ratings by recognized rating organizations are an increasingly important factor in establishing the competitive position of insurance companies. Ratings information is broadly disseminated and generally used throughout the industry. We believe our claims paying ability and financial strength ratings are an important factor in marketing our products to certain of our customers. In addition, our debt ratings impact both the cost and availability of future borrowings. Each of the rating agencies reviews its ratings periodically and there can be no assurance that current ratings will be maintained in the future. Our ratings reflect each rating agency’s opinion of our financial strength, operating performance, and ability to meet our debt obligations or obligations to policyholders, but are not evaluations directed toward the protection of investors in our common stock and should not be relied upon as such.

Historically, rating agencies take action to lower ratings due to, among other things, perceived concerns about liquidity or solvency, the competitive environment in the insurance industry, the inherent uncertainty in determining reserves for future claims, the outcome of pending litigation and regulatory investigations, and possible changes in the methodology or criteria applied by the rating agencies. In addition, rating agencies have come under regulatory and public scrutiny over the ratings assigned to various fixed-income products. As a result, rating agencies may (i) become more conservative in their methodology and criteria, (ii) increase the frequency or scope of their credit reviews, (iii) request additional information from the companies that they rate, or (iv) adjust upward the capital and other requirements employed in the rating agency models for maintenance of certain ratings levels.

We believe that some of our customers place importance on our credit ratings, and we may lose customers and compete less successfully if our ratings were to be downgraded. In addition, our credit ratings affect our ability to obtain investment capital on favorable terms. If our credit ratings were to be lowered, our cost of borrowing likely would increase, our sales and earnings could decrease, and our results of operations, financial position, and cash flows may be materially adversely affected.

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The securities and credit markets may experience volatility and disruption, which may adversely affect our business.

Volatility or disruption in the securities and credit markets could impact our investment portfolio. We evaluate our investment securities for impairment on a quarterly basis. This review is subjective and requires a high degree of judgment. For the purpose of determining gross realized gains and losses, the cost of investment securities sold is based upon specific identification. For debt securities held, we recognize an impairment loss in income when the fair value of the debt security is less than the carrying value and we have the intent to sell the debt security or it is more likely than not that we will be required to sell the debt security before recovery of our amortized cost basis, or if a credit loss has occurred. When we do not intend to sell a security in an unrealized loss position, potential other-than-temporary impairments are considered using variety of factors, including the length of time and extent to which the fair value has been less than cost; adverse conditions specifically related to the industry, geographic area or financial condition of the issuer or underlying collateral of a security; payment structure of the security; changes in credit rating of the security by the rating agencies; the volatility of the fair value changes; and changes in fair value of the security after the balance sheet date. For debt securities, we take into account expectations of relevant market and economic data. We continuously review our investment portfolios and there is a continuing risk that declines in fair value may occur and additional material realized losses from sales or other-than-temporary impairments may be recorded in future periods.

We believe our cash balances, investment securities, operating cash flows, and funds available under our credit agreement or from other public or private financing sources, taken together, provide adequate resources to fund ongoing operating and regulatory requirements, acquisitions, future expansion opportunities, and capital expenditures for at least the next twelve months, as well as to refinance or repay debt, and repurchase shares. However, continuing adverse securities and credit market conditions may significantly affect the availability of credit. While there is no assurance in the current economic environment, we have no reason to believe the lenders participating in our credit agreement will not be willing and able to provide financing in accordance with the terms of the agreement.

Our access to additional credit will depend on a variety of factors such as market conditions, the general availability of credit, both to the overall market and our industry, our credit ratings and debt capacity, as well as the possibility that customers or lenders could develop a negative perception of our long or short-term financial prospects. Similarly, our access to funds could be limited if regulatory authorities or rating agencies were to take negative actions against us. If a combination of these factors were to occur, we may not be able to successfully obtain additional financing on favorable terms or at all.

ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

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ITEM 2. PROPERTIES

The following table lists, by state, the number of medical centers and administrative offices we owned or leased at December 31, 2015:

	Medical Centers		Administrative Offices
	Owned	Leased	Owned	Leased	Total
Florida	11	123	1	96	231
Texas	—	15	2	24	41
Kentucky	2	1	11	12	26
Virginia	—	8	—	8	16
California	—	2	—	13	15
Arizona	—	8	—	7	15
Louisiana	—	4	—	10	14
Ohio	—	1	—	13	14
Illinois	—	5	—	8	13
New York	—	—	—	13	13
Georgia	—	7	—	3	10
Tennessee	—	—	—	10	10
North Carolina	—	—	—	10	10
Nevada	—	5	—	5	10
South Carolina	—	—	4	6	10
Indiana	—	2	—	7	9
Puerto Rico	—	—	—	9	9
New Jersey	—	—	—	8	8
Colorado	—	3	—	4	7
Pennsylvania	—	—	—	6	6
Wisconsin	—	—	1	5	6
Others	—	3	—	47	50
Total	13	187	19	324	543

The medical centers we operate are primarily located in Florida and Texas, including full-service, multi-specialty medical centers staffed by primary care providers and medical specialists, urgent care facilities, and worksite medical facilities. Of the medical centers included in the table above, approximately 64 of these facilities are leased or subleased to our contracted providers to operate.

Our principal executive office is located in the Humana Building, 500 West Main Street, Louisville, Kentucky 40202. In addition to the headquarters in Louisville, Kentucky, we maintain other principal operating facilities used for customer service, enrollment, and/or claims processing and certain other corporate functions in Louisville, Kentucky; Green Bay, Wisconsin; Tampa, Florida; Cincinnati, Ohio; San Antonio, Texas; and San Juan, Puerto Rico.

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ITEM 3. LEGAL PROCEEDINGS

We are party to a variety of legal actions in the ordinary course of business, certain of which may be styled as class-action lawsuits. Among other matters, this litigation may include employment matters, claims of medical malpractice, bad faith, nonacceptance or termination of providers, anticompetitive practices, improper rate setting, provider contract rate disputes, failure to disclose network discounts and various other provider arrangements, general contractual matters, intellectual property matters, and challenges to subrogation practices. For a discussion of our material legal actions, including those not in the ordinary course of business, see “Legal Proceedings and Certain Regulatory Matters” in Note 16 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data. We cannot predict the outcome of these suits with certainty.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

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PART II

ITEM 5. MARKET FOR THE REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Market Information

Our common stock trades on the New York Stock Exchange under the symbol HUM. The following table shows the range of high and low closing sales prices as reported on the New York Stock Exchange Composite Price for each quarter in the years ended December 31, 2015 and 2014:

	High		Low
Year Ended December 31, 2015
First quarter	$	182.79	$	139.09
Second quarter	$	214.92	$	163.07
Third quarter	$	193.14	$	174.16
Fourth quarter	$	186.67	$	164.25
Year Ended December 31, 2014
First quarter	$	118.78	$	95.59
Second quarter	$	128.95	$	104.74
Third quarter	$	135.51	$	115.97
Fourth quarter	$	149.07	$	124.17

Holders of our Capital Stock

As of January 31, 2016, there were approximately 2,900 holders of record of our common stock and approximately 41,200 beneficial holders of our common stock.

Dividends

The following table provides details of dividend payments, excluding dividend equivalent rights, in 2014 and 2015, under our Board approved quarterly cash dividend policy:

Record Date	Payment Date	Amount per Share	Total Amount
			(in millions)
2014 payments
12/31/2013	1/31/2014	$0.27	$42
3/31/2014	4/25/2014	$0.27	$42
6/30/2014	7/25/2014	$0.28	$43
9/30/2014	10/31/2014	$0.28	$43
2015 payments
12/31/2014	1/30/2015	$0.28	$42
3/31/2015	4/24/2015	$0.28	$42
6/30/2015	7/31/2015	$0.29	$43
9/30/2105	10/30/2015	$0.29	$43

The Merger discussed in Note 2 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data does not impact our ability and intent to continue quarterly dividend payments prior to the closing of the Merger consistent with our historical dividend payments. Under the terms of the Merger Agreement, we have agreed with Aetna that our quarterly dividend will not exceed $0.29 per share prior to the closing of the Merger.

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Declaration and payment of future quarterly dividends is at the discretion of our Board and may be adjusted as business needs or market conditions change. In addition, under the terms of the Merger Agreement, we have agreed with Aetna to coordinate the declaration and payment of dividends so that our stockholders do not fail to receive a quarterly dividend around the time of the closing of the Merger.

On October 29, 2015, the Board declared a cash dividend of $0.29 per share that was paid on January 29, 2016 to stockholders of record on December 30, 2015, for an aggregate amount of $43 million.

Stock Total Return Performance

The following graph compares our total return to stockholders with the returns of the Standard & Poor’s Composite 500 Index (“S&P 500”) and the Dow Jones US Select Health Care Providers Index (“Peer Group”) for the five years ended December 31, 2015. The graph assumes an investment of $100 in each of our common stock, the S&P 500, and the Peer Group on December 31, 2010, and that dividends were reinvested when paid.

	12/31/2010		12/31/2011		12/31/2012		12/31/2013		12/31/2014		12/31/2015
HUM	$	100	$	162	$	128	$	195	$	274	$	343
S&P 500	$	100	$	102	$	118	$	157	$	178	$	181
Peer Group	$	100	$	110	$	129	$	177	$	226	$	239

The stock price performance included in this graph is not necessarily indicative of future stock price performance.

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Issuer Purchases of Equity Securities

The following table provides information about purchases by us during the three months ended December 31, 2015 of equity securities that are registered by us pursuant to Section 12 of the Exchange Act:

Period	Total Number of Shares Purchased (1)	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (1)(2)	Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs (1)
October 2015	—	$	—	—	$	—
November 2015	—	—		—	—
December 2015	—	—		—	—
Total	—	$	—	—

(1) In September 2014, the Board of Directors replaced a previous share repurchase authorization of up to $1 billion with a current authorization for repurchases of up to $2 billion of our common shares exclusive of shares repurchased in connection with employee stock plans, expiring on December 31, 2016. Pursuant to the Merger Agreement, after July 2, 2015, we are prohibited from repurchasing any of our outstanding securities without the prior written consent of Aetna, other than repurchases of shares of our common stock in connection with the exercise of outstanding stock options or the vesting or settlement of outstanding restricted stock awards. Accordingly, as announced on July 3, 2015, we have suspended our share repurchase program. Our remaining repurchase authorization was$1.04 billion as of July 3, 2015.

(2) Excludes 0.3 million shares repurchased in connection with employee stock plans.

The Merger Agreement includes customary restrictions on the conduct of our business prior to the completion of the Merger, generally requiring us to conduct our business in the ordinary course and subjecting us to a variety of customary specified limitations absent Aetna’s prior written consent, including, for example, limitations on dividends (we agreed that our quarterly dividend will not exceed $0.29 per share) and repurchases of our securities (we agreed to suspend our share repurchase program), restrictions on our ability to enter into material contracts, and negotiated thresholds for capital expenditures, capital contributions, acquisitions and divestitures of businesses.

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ITEM 6. SELECTED FINANCIAL DATA

	2015 (a)			2014 (b)			2013 (c)			2012 (d)			2011
	(dollars in millions, except per common share results)
Summary of Operating Results:
Revenues:
Premiums	$	52,409		$	45,959		$	38,829		$	37,009		$	35,106
Services	1,406			2,164			2,109			1,726			1,360
Investment income	474			377			375			391			366
Total revenues	54,289			48,500			41,313			39,126			36,832
Operating expenses:
Benefits	44,269			38,166			32,564			30,985			28,823
Operating costs	7,318			7,639			6,355			5,830			5,395
Depreciation and amortization	355			333			333			295			270
Total operating expenses	51,942			46,138			39,252			37,110			34,488
Income from operations	2,347			2,362			2,061			2,016			2,344
Interest expense	186			192			140			105			109
Gain on sale of business	270			—			—			—			—
Income before income taxes	2,431			2,170			1,921			1,911			2,235
Provision for income taxes	1,155			1,023			690			689			816
Net income	$	1,276		$	1,147		$	1,231		$	1,222		$	1,419
Basic earnings per common share	$	8.54		$	7.44		$	7.81		$	7.56		$	8.58
Diluted earnings per common share	$	8.44		$	7.36		$	7.73		$	7.47		$	8.46
Dividends declared per common share	$	1.15		$	1.11		$	1.07		$	1.03		$	0.75
Financial Position:
Cash and investments	$	11,681		$	11,482		$	10,938		$	11,153		$	10,830
Total assets	24,705			23,527			20,735			19,979			17,708
Benefits payable	4,976			4,475			3,893			3,779			3,754
Debt	3,821			3,825			2,600			2,611			1,659
Stockholders’ equity	10,346			9,646			9,316			8,847			8,063
Cash flows from operations	$	868		$	1,618		$	1,716		$	1,923		$	2,079
Key Financial Indicators:
Benefit ratio	84.5		%	83.0		%	83.9		%	83.7		%	82.1		%
Operating cost ratio	13.6		%	15.9		%	15.5		%	15.1		%	14.8		%
Membership by Segment:
Retail segment:
Medical membership	9,226,800			8,376,500			6,459,300			5,956,700			5,117,400
Specialty membership	1,153,100			1,165,800			1,042,500			948,700			782,500
Group segment:
Medical membership	4,963,400			5,430,200			5,501,600			5,573,400			5,500,600
Specialty membership	6,068,700			6,502,700			6,780,800			7,136,200			6,532,600
Other Businesses:
Medical membership	32,600			35,000			23,400			558,700			566,600
Consolidated:
Total medical membership	14,222,800			13,841,700			11,984,300			12,088,800			11,184,600
Total specialty membership	7,221,800			7,668,500			7,823,300			8,084,900			7,315,100

(a) Includes a gain on the sale of Concentra Inc., net of transaction costs, of $270 million ($238 million after tax, or $1.57 per diluted common share). Also includes benefits expense of $176 million ($112 million after tax, or $0.74 per diluted common share) for a provision for probable future losses (premium deficiency) for individual commercial medical business compliant with the Health Care Reform Law for the 2016 coverage year.

(b) Includes loss on extinguishment of debt of $37 million ($23 million after tax, or $0.15 per diluted common share) for the redemption of senior notes.

(c) Includes benefits expense of $243 million ($154 million after tax, or $0.99 per diluted common share) for reserve strengthening associated with our non-strategic closed block of long-term care insurance policies.

(d) Includes the acquired operations of Arcadian Management Services, Inc. from March 31, 2012, SeniorBridge Family Companies, Inc. from July 6, 2012, and Metropolitan Health Networks, Inc. from December 21, 2012.

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ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Executive Overview

General

Humana Inc., headquartered in Louisville, Kentucky, is a leading health and well-being company focused on making it easy for people to achieve their best health with clinical excellence through coordinated care. Our strategy integrates care delivery, the member experience, and clinical and consumer insights to encourage engagement, behavior change, proactive clinical outreach and wellness for the millions of people we serve across the country.

Our industry relies on two key statistics to measure performance. The benefit ratio, which is computed by taking total benefits expense as a percentage of premiums revenue, represents a statistic used to measure underwriting profitability. The operating cost ratio, which is computed by taking total operating costs, excluding depreciation and amortization, as a percentage of total revenue less investment income, represents a statistic used to measure administrative spending efficiency.

Aetna Merger

On July 2, 2015, we entered into an Agreement and Plan of Merger, which we refer to in this report as the Merger Agreement, with Aetna Inc. and certain wholly owned subsidiaries of Aetna Inc., which we refer to collectively as Aetna, which sets forth the terms and conditions under which we will merge with, and become a wholly owned subsidiary of Aetna, a transaction we refer to in this report as the Merger. A copy of the Merger Agreement was filed as Exhibit 2.1 to our Current Report on Form 8-K filed with the U.S. Securities and Exchange Commission on July 7, 2015. Under the terms of the Merger Agreement, at the closing of the Merger, each outstanding share of our common stock will be converted into the right to receive (i) 0.8375 of a share of Aetna common stock and (ii) $125 in cash. The total transaction was estimated at approximately $37 billion including the assumption of Humana debt, based on the closing price of Aetna common shares on July 2, 2015. The Merger Agreement includes customary restrictions on the conduct of our business prior to the completion of the Merger, generally requiring us to conduct our business in the ordinary course and subjecting us to a variety of customary specified limitations absent Aetna’s prior written consent, including, for example, limitations on dividends (we agreed that our quarterly dividend will not exceed $0.29 per share) and repurchases of our securities (we agreed to suspend our share repurchase program), restrictions on our ability to enter into material contracts, and negotiated thresholds for capital expenditures, capital contributions, acquisitions and divestitures of businesses.

On October 19, 2015, our stockholders approved the adoption of the Merger Agreement at a special stockholder meeting. Of the 129,240,721 shares voting at the meeting, more than 99% voted in favor of the adoption of the Merger Agreement, which represented approximately 87% of our total outstanding shares of common stock as of the September 16, 2015 record date. Also on October 19, 2015, the holders of Aetna outstanding shares approved the issuance of Aetna common stock in the Merger at a special meeting of Aetna shareholders.

The Merger is subject to customary closing conditions, including, among other things, (i) the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the receipt of necessary approvals under state insurance and healthcare laws and regulations and pursuant to certain licenses of certain of Humana’s subsidiaries, (ii) the absence of legal restraints and prohibitions on the consummation of the Merger, (iii) listing of the Aetna common stock to be issued in the Merger on the New York Stock Exchange, (iv) subject to the relevant standards set forth in the Merger Agreement, the accuracy of the representations and warranties made by each party, (v) material compliance by each party with its covenants in the Merger Agreement, and (vi) no “Company Material Adverse Effect” with respect to us and no “Parent Material Adverse Effect” with respect to Aetna, in each case since the execution of and as defined in the Merger Agreement. In addition, Aetna’s obligation to consummate the Merger is subject to (a) the condition that the required regulatory approvals do not impose any condition that, individually or in the aggregate, would reasonably be expected to have a “Regulatory Material Adverse Effect” (as such term is defined in the Merger Agreement), and (b) CMS has not imposed any sanctions with respect

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to our Medicare Advantage, or MA, business that, individually or in the aggregate, is or would reasonably be expected to be material and adverse to us and our subsidiaries, taken as a whole. The Merger is currently expected to close in the second half of 2016.

Business Segments

On January 1, 2015, we realigned certain of our businesses among our reportable segments to correspond with internal management reporting changes and renamed our Employer Group segment to the Group segment. Our three reportable segments remain Retail, Group, and Healthcare Services. The more significant realignments included reclassifying Medicare benefits offered to groups to the Retail segment from the Group segment, bringing all of our Medicare offerings, which are now managed collectively, together in one segment, recognizing that in some instances we market directly to individuals that are part of a group Medicare account. In addition, we realigned our military services business, primarily consisting of our TRICARE South Region contract previously included in the Other Businesses category, to our Group segment as we consider this contract with the government to be a group account. Prior period segment financial information has been recast to conform to the 2015 presentation. This is further described in Note 2 to the consolidated financial statements included in Item 8. - Financial Statements and Supplementary Data.

We manage our business with three reportable segments: Retail, Group, and Healthcare Services. In addition, the Other Businesses category includes businesses that are not individually reportable because they do not meet the quantitative thresholds required by generally accepted accounting principles. These segments are based on a combination of the type of health plan customer and adjacent businesses centered on well-being solutions for our health plans and other customers, as described below. These segment groupings are consistent with information used by our Chief Executive Officer to assess performance and allocate resources.

The Retail segment consists of Medicare benefits, marketed to individuals or directly via group accounts, as well as individual commercial fully-insured medical and specialty health insurance benefits, including dental, vision, and other supplemental health and financial protection products. In addition, the Retail segment also includes our contract with CMS to administer the LI-NET prescription drug plan program and contracts with various states to provide Medicaid, dual eligible, and Long-Term Support Services benefits, collectively our state-based contracts. The Group segment consists of employer group commercial fully-insured medical and specialty health insurance benefits, including dental, vision, and other supplemental health and voluntary insurance benefits, as well as administrative services only, or ASO products. In addition, our Group segment includes our health and wellness products (primarily marketed to employer groups) and military services business, primarily our TRICARE South Region contract. The Healthcare Services segment includes services offered to our health plan members as well as to third parties, including pharmacy solutions, provider services, home based services, and clinical programs, as well as services and capabilities to advance population health. We will continue to report under the category of Other Businesses those businesses which do not align with the reportable segments described above, primarily our closed-block long-term care insurance policies.

The results of each segment are measured by income before income taxes. Transactions between reportable segments primarily consist of sales of services rendered by our Healthcare Services segment, primarily pharmacy, provider, and home based services as well as clinical programs, to our Retail and Group customers. Intersegment sales and expenses are recorded at fair value and eliminated in consolidation. Members served by our segments often use the same provider networks, enabling us in some instances to obtain more favorable contract terms with providers. Our segments also share indirect costs and assets. As a result, the profitability of each segment is interdependent. We allocate most operating expenses to our segments. Assets and certain corporate income and expenses are not allocated to the segments, including the portion of investment income not supporting segment operations, interest expense on corporate debt, and certain other corporate expenses. These items are managed at a corporate level. These corporate amounts are reported separately from our reportable segments and are included with intersegment eliminations.

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Seasonality

One of the product offerings of our Retail segment is Medicare stand-alone prescription drug plans, or PDPs, under the Medicare Part D program. Our quarterly Retail segment earnings and operating cash flows are impacted by the Medicare Part D benefit design and changes in the composition of our membership. The Medicare Part D benefit design results in coverage that varies as a member’s cumulative out-of-pocket costs pass through successive stages of a member’s plan period, which begins annually on January 1 for renewals. These plan designs generally result in us sharing a greater portion of the responsibility for total prescription drug costs in the early stages and less in the latter stages. As a result, the PDP benefit ratio generally decreases as the year progresses. In addition, the number of low-income senior members as well as year-over-year changes in the mix of membership in our stand-alone PDP products affects the quarterly benefit ratio pattern.

Our Group segment also experiences seasonality in the benefit ratio pattern. However, the effect is opposite of Medicare stand-alone PDP in the Retail segment, with the Group segment’s benefit ratio increasing as fully-insured members progress through their annual deductible and maximum out-of-pocket expenses. Similarly, certain of our fully-insured individual commercial medical products in our Retail segment experience seasonality in the benefit ratio akin to the Group segment, including the effect of existing previously underwritten members transitioning to policies compliant with the Health Care Reform Law with us and other carriers. As previously underwritten members transition, it results in policy lapses and the release of reserves for future policy benefits partially offset by the recognition of previously deferred acquisition costs. These policy lapses generally occur during the first quarter of the new coverage year following the open enrollment period reducing the benefit ratio in the first quarter. The recognition of a premium deficiency reserve for our individual commercial medical business compliant with the Health Care Reform Law in the fourth quarter of 2015, discussed in more detail in the highlights that follow, negatively impacted the benefit ratio pattern in 2015 and conversely is expected to favorably impact the benefit ratio in 2016 for this business. The quarterly benefit ratio pattern for our individual commercial medical business compliant with the Health Care Reform Law will be relatively flat throughout 2016 as opposed to the increasing benefit ratio pattern exhibited in prior years.

In addition, the Retail segment also experiences seasonality in the operating cost ratio as a result of costs incurred in the second half of the year associated with the Medicare and individual health care exchange marketing seasons.

2015 Highlights

Consolidated

• Our 2015 results reflect the continued implementation of our strategy to offer our members affordable health care combined with a positive consumer experience in growing markets. At the core of this strategy is our integrated care delivery model, which unites quality care, high member engagement, and sophisticated data analytics. Our approach to primary, physician-directed care for our members aims to provide quality care that is consistent, integrated, cost-effective, and member-focused, provided by both employed physicians and physicians with network contract arrangements. The model is designed to improve health outcomes and affordability for individuals and for the health system as a whole, while offering our members a simple, seamless healthcare experience. We believe this strategy is positioning us for long-term growth in both membership and earnings. We offer providers a continuum of opportunities to increase the integration of care and offer assistance to providers in transitioning from a fee-for-service to a value-based arrangement. These include performance bonuses, shared savings and shared risk relationships. At December 31, 2015, approximately 1,633,100 members, or 59.3%, of our individual Medicare Advantage members were in value-based relationships under our integrated care delivery model, as compared to 1,301,000 members, or 53.6%, at December 31, 2014.

• On June 1, 2015, we completed the sale of our wholly owned subsidiary, Concentra Inc., or Concentra, to MJ Acquisition Corporation, a joint venture between Select Medical Holdings Corporation and Welsh, Carson, Anderson & Stowe XII, L.P., a private equity fund, for approximately $1,055 million in cash, excluding approximately $22 million of transaction costs. In connection with the sale, we recognized a pre-tax gain, net of transaction costs, of $270 million, or $1.57 per diluted common share in 2015.

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• During 2015, we recorded transaction costs in connection with the Merger of approximately $23.1 million, or $0.14 per diluted common share. Certain costs associated with the transaction are not deductible for tax purposes.

• Excluding the impact of the sale of Concentra and transaction costs associated with the Merger, our pretax results for 2015 as compared to 2014 reflect year-over-year improvement in the Group and Healthcare Services segment pretax results and higher investment income, partially offset by a year-over-year decline in Retail segment pretax results as discussed in the detailed segment results discussion that follows.

• Year-over-year comparisons of the operating cost ratio are impacted by an increase in 2015 of the non-deductible health insurance industry fee mandated by the Health Care Reform Law. Likewise, year-over-year comparisons of the benefit ratio reflect the increase in this fee in the pricing of our products for 2015 which reduces our benefit ratio.

• Investment income increased$97 million in 2015, primarily due to higher realized capital gains in 2015 as a result of the repositioning of our portfolio given recent market volatility and anticipated changes to interest rates.

• Year-over-year comparisons of diluted earnings per common share are favorably impacted by a lower number of shares used to compute diluted earnings per common share reflecting the impact of share repurchases.

• Operating cash flow provided by operations was $868 million for the year ended December 31, 2015 as compared to operating cash flow of $1.6 billion for the year ended December 31, 2014. The decrease in our operating cash flows primarily reflects the effect of significant growth in individual commercial medical and group Medicare Advantage membership in the prior year and changes in the timing of other working capital items related to the growth in our pharmacy business and growth in net receivables under the commercial risk adjustment, reinsurance, and risk corridor programs under the Health Care Reform Law, commonly referred to as the 3Rs. Prior year cash flows were favorably impacted from the typical pattern of claim payments that lagged premium receipts related to new membership. Individual commercial medical added 548,000 new members in 2014 compared to a decline of 90,400 members in 2015. Likewise, group Medicare Advantage added 60,600 new members in 2014 compared to a decline of 5,600 members in 2015.

• In 2015, we paid the federal government $867 million for the annual non-deductible health insurance industry fee compared to our payment of $562 million in 2014. This fee is not deductible for tax purposes, which significantly increased our effective income tax rate beginning in 2014. The health insurance industry fee is further described below under the section titled "Health Care Reform." The Consolidated Appropriations Act, 2016, enacted on December 18, 2015, included a one-time one year suspension in 2017 of the health insurer fee.This will significantly reduce our effective tax rate in 2017.

• During 2015, we repurchased 1.85 million shares in open market transactions for $329 million and paid dividends to stockholders of $172 million. Pursuant to the Merger Agreement, after July 2, 2015, we are prohibited from repurchasing any of our outstanding securities without the prior written consent of Aetna, other than repurchases of shares of our common stock in connection with the exercise of outstanding stock options or the vesting or settlement of outstanding restricted stock awards. Accordingly, as announced on July 3, 2015, we have suspended our share repurchase program. Our remaining repurchase authorization was$1.04 billion as of July 3, 2015. The Merger does not impact our ability and intent to continue quarterly dividend payments prior to the closing of the Merger consistent with our historical dividend payments. Under the terms of the Merger Agreement, we have agreed with Aetna that our quarterly dividend will not exceed $0.29 per share prior to the closing of the Merger.

Retail Segment

• On April 6, 2015, CMS announced final 2016 Medicare benchmark payment rates and related technical factors impacting the bid benchmark premiums, which we refer to as the Final Rate Notice. We believe the Final Rate Notice, together with the impact of payment cuts associated with the Health Care Reform Law, quality bonuses,

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risk coding modifications, and other funding formula changes, indicated 2016 Medicare Advantage funding increases for us of approximately 1.0% on average. Although the overall rate adjustment is positive, geographic-specific impacts may vary significantly from this average, particularly in Florida. We believe we have effectively designed Medicare Advantage products based upon the applicable level of rate changes while continuing to remain competitive compared to both the combination of original Medicare with a supplement policy and Medicare Advantage products offered by our competitors. Failure to execute these strategies may result in a material adverse effect on our results of operations, financial position, and cash flows.

• In 2015, our Retail segment pretax income decreased by $409 million, or 30.5%, from 2014 primarily due to higher Medicare Advantage and individual commercial medical benefit ratios year-over-year, including the impact of benefits expense associated with a premium deficiency reserve for certain of our individual commercial products for the 2016 coverage year as described further below and in the results of operations discussion that follows. The higher benefit ratios were partially offset by declines in the Retail segment operating cost ratios, Medicare membership growth, and higher investment income year-over-year.

• Individual Medicare Advantage operating results for 2015 included significant membership growth but were negatively impacted by certain developments related to our product pricing assumptions for 2015. These developments primarily related to lower-than-expected 2015 financial claim recovery levels (included in medical claims reserve development) and lower-than-anticipated reductions in inpatient admissions. Claims data from the fourth quarter of 2015 and early 2016 indicate that inpatient admissions continue to develop favorably versus expectations and claim recoveries have stabilized. We are closely monitoring these favorable trends.

• Operating results for our individual commercial medical business compliant with the Health Care Reform Law have been challenged primarily due to unanticipated modifications in the program subsequent to the passing of the Health Care Reform Law, resulting in higher covered population morbidity and the ensuing enrollment and claims issues causing volatility in claims experience. The benefit ratios associated with many of our individual commercial medical products, in particular Health Care Reform Law compliant offerings, significantly exceeded prior expectations for fiscal year 2015, driven primarily by the on-going impact of the transitional policies, special enrollment period exemptions associated with the program, and government-mandated product designs that attracted higher-utilizing members . Additionally, on June 30, 2015, CMS issued data with respect to the reinsurance and risk adjustment premium stabilization programs for the 2014 plan year which indicated a healthier risk profile comparison for our membership relative to state averages than had been previously anticipated. This resulted in adjustments to certain of the 3Rs during 2015.

We took a number of actions in 2015 to improve the profitability of our individual commercial medical business in 2016.These actions were subject to regulatory restrictions in certain geographies and included premium increases for the 2016 coverage year related generally to the first half of 2015 claims experience, the discontinuation of certain products as well as exit of certain markets for 2016, network improvements, enhancements to claims and clinical processes and administrative cost control. Despite these actions, the deterioration in the second half of 2015 claims experience together with 2016 open enrollment results indicating the retention of many high-utilizing members for 2016 resulted in a probable future loss. As a result of our assessment of the profitability of our individual medical policies compliant with the Health Care Reform Law, in the fourth quarter of 2015, we recorded a provision for probable future losses (premium deficiency reserve) for the 2016 coverage year of $176 million, or $0.74 per diluted common share. The premium deficiency reserve includes the estimated benefit of approximately $340 million associated with risk corridor provisions expected for the 2016 coverage year.

In light of the premium deficiency reserve recognized in the fourth quarter of 2015 for the 2016 coverage year, results for this business for 2016 are expected to primarily include results associated with the wind-down of plans that are not compliant with the Health Care Reform Law, including the related release of policy reserves, as well as indirect administrative costs associated with plans that are compliant with the Health Care Reform Law. We are continuing to evaluate our participation in the individual commercial medical line of business for 2017.

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• Individual Medicare Advantage membership of 2,753,400 at December 31, 2015increased325,500 members, or 13.4%, from 2,427,900 at December 31, 2014 reflecting net membership additions, particularly for our Health Maintenance Organization, or HMO, offerings, for the 2015 plan year. January 2016 individual Medicare Advantage membership approximated 2,811,000, increasing approximately 57,600 members, or 2%, from December 31, 2015 reflecting net membership additions during the recently completed 2016 annual election period for Medicare beneficiaries. For full year 2016, we anticipate net membership growth in our individual Medicare Advantage offerings of 100,000 to 120,000.

• Group Medicare Advantage membership of 484,100 at December 31, 2015decreased5,600 members, or 1.1%, from 489,700 at December 31, 2014. For full year 2016, we expect a net membership decline in our Group Medicare Advantage offerings of 120,000 to 125,000 members primarily due to the loss of a large account that converted to a private exchange offering. Approximately 50% of members from that account selected an individual Humana offering for 2016, with the majority enrolling in a Medicare supplement plan.

• Medicare stand-alone PDP membership of 4,557,900 at December 31, 2015increased563,900 members, or 14.1%, from 3,994,000 at December 31, 2014reflecting net membership additions, primarily for our Humana-Walmart plan offering, for the 2015 plan year. January 2016 Medicare stand-alone PDP membership (excluding transitional growth from the LI-NET prescription drug plan program) increased approximately 240,000 members, or 5%, from December 31, 2015 reflecting net membership additions, primarily for our Humana-Walmart plan offering, during the recently completed 2016 annual election period for Medicare beneficiaries. For full year 2016, we anticipate net membership growth in our Medicare stand-alone PDP offerings of 300,000 to 330,000.

• Our state-based Medicaid membership of 373,700 at December 31, 2015increased56,900 members, or 18.0%, from 316,800 at December 31, 2014primarily driven by the addition of members under our Florida Medicaid contract.

• Individual commercial medical membership of 1,057,700 at December 31, 2015decreased90,400 members, or 7.9%, from 1,148,100 at December 31, 2014primarily reflecting the loss of approximately 150,000 members due to termination by CMS for lack of proper eligibility documentation from the member as well as the loss of members who had subscribed to plans that were not compliant with the Health Care Reform Law. These declines were partially offset by an increase in membership in plans that are compliant with the Health Care Reform Law, primarily off-exchange. Individual commercial medical membership in plans compliant with the Health Care Reform Law experienced growth in 2015, but at a lesser rate than in 2014. At December 31, 2015, individual commercial medical membership in plans compliant with the Health Care Reform Law, both on-exchange and off-exchange, was 757,900 members, an increase of 71,600 members or 10.4% from December 31, 2014.

We expect a net decline in individual commercial medical membership (excluding Medicare Supplement) for full year 2016 of 200,000 to 300,000, primarily reflecting increases in premiums as well as benefit redesigns that took effect on January 1, 2016. This membership expectation takes into account plans compliant with the Health Care Reform Law, both on and off exchange, and legacy plans that are not compliant with the Health Care Reform Law. Membership estimates for 2016 include the expectation of coverage termination by 50% to 60% of the approximately 100,000 members impacted by plan discontinuances.

Group Segment

• Group segment pretax income grew$107 million, or 70.9%, for the year ended December 31, 2015 primarily due to improvement in the operating cost ratio partially offset by an increase in the benefit ratio as discussed in the results of operations discussion that follows.

• Membership in HumanaVitality^®, our wellness and loyalty rewards program, rose 2.0% to 3,932,300 at December 31, 2015 from 3,856,800 at December 31, 2014.

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Healthcare Services Segment

• Year-over-year comparisons of results of operations are impacted by the completion of the sale of Concentra on June 1, 2015.

• As discussed in the detailed Healthcare Services segment results of operations discussion that follows, our Healthcare Services segment pretax income increased$243 million, or 32.9%, for the year ended December 31, 2015. This increase was primarily due to higher earnings from our pharmacy solutions and home based services businesses as they serve our growing Medicare membership. High levels of Medicare membership growth as well as increased engagement of members in clinical programs have resulted in higher usage of services across this segment. In addition, improved operating efficiency in the pharmacy business primarily was driven by lower cost of goods associated with increased purchasing scale and lower cost-to-fill primarily due to improvements in technology.

• Programs to enhance the quality of care for members are key elements of our integrated care delivery model. We have expanded our identification of and outreach to members in need of clinical intervention. At December 31, 2015, we enrolled approximately 590,300 Medicare Advantage members with complex chronic conditions in the Humana Chronic Care Program, a 40.3%increase compared with approximately 420,700 members at December 31, 2014, reflecting enhanced predictive modeling capabilities and focus on proactive clinical outreach and member engagement. We believe these initiatives lead to better health outcomes for our members and lower health care costs.

Health Care Reform

The Health Care Reform Law enacted significant reforms to various aspects of the U.S. health insurance industry. Certain significant provisions of the Health Care Reform Law include, among others, mandated coverage requirements, mandated benefits and guarantee issuance associated with commercial medical insurance, rebates to policyholders based on minimum benefit ratios, adjustments to Medicare Advantage premiums, the establishment of federally-facilitated or state-based exchanges coupled with programs designed to spread risk among insurers, and the introduction of plan designs based on set actuarial values. In addition, the Health Care Reform Law established insurance industry assessments, including an annual health insurance industry fee and a three-year $25 billion industry wide commercial reinsurance fee. The annual health insurance industry fee levied on the insurance industry was $8 billion in 2014 and $11.3 billion in each of 2015 and 2016, with increasing annual amounts thereafter, and is not deductible for income tax purposes, which significantly increased our effective income tax rate. Our effective tax rate for 2015 was approximately 47.5%, including the favorable impact of the sale of Concentra on June 1, 2015. Our effective tax rate for 2016 is expected to be approximately 49% to 51%, excluding the impact of transaction costs associated with the Merger. In 2015, we paid the federal government $867 million for the annual health insurance industry fee, a 54.3% increase from $562 million in 2014, primarily reflecting an increase in the total industry fee. We expect our portion of the annual health insurance industry fee for 2016 to be higher than in 2015 given growth in our market share. The Consolidated Appropriations Act, 2016, enacted on December 18, 2015, included a one-time one year suspension in 2017 of the health insurer fee.This will significantly reduce our effective tax rate in 2017. The health insurance industry fee levied on the insurance industry was previously expected to be $14 billion in 2017.

In addition, the Health Care Reform Law expands federal oversight of health plan premium rates and could adversely affect our ability to appropriately adjust health plan premiums on a timely basis. Financing for these reforms comes, in part, from material additional fees and taxes on us (as discussed above) and other health plans and individuals which began in 2014, as well as reductions in certain levels of payments to us and other health plans under Medicare as described in this 2015 10-K.

As noted above, the Health Care Reform Law required the establishment of health insurance exchanges for individuals and small employers to purchase health insurance that became effective January 1, 2014, with an annual open enrollment period. Insurers participating on the health insurance exchanges must offer a minimum level of benefits and are subject to guidelines on setting premium rates and coverage limitations. We may be adversely selected by individuals who have a higher acuity level than the anticipated pool of participants in this market. In addition, the risk

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corridor, reinsurance, and risk adjustment provisions of the Health Care Reform Law, established to apportion risk for insurers, may not be effective in appropriately mitigating the financial risks related to our products. In addition, regulatory changes to the implementation of the Health Care Reform Law that allowed individuals to remain in plans that are not compliant with the Health Care Reform Law or to enroll outside of the annual enrollment period may have an adverse effect on our pool of participants in the health insurance exchange. In addition, states may impose restrictions on our ability to increase rates. All of these factors may have a material adverse effect on our results of operations, financial position, or cash flows if our premiums are not adequate or do not appropriately reflect the acuity of these individuals. Any variation from our expectations regarding acuity, enrollment levels, adverse selection, or other assumptions used in setting premium rates could have a material adverse effect on our results of operations, financial position, and cash flows and could impact our decision to participate or continue in the program in certain states.

As discussed above, it is reasonably possible that the Health Care Reform Law and related regulations, as well as future legislative changes, including legislative restrictions on our ability to manage our provider network or otherwise operate our business, or regulatory restrictions on profitability, including by comparison of our Medicare Advantage profitability to our non-Medicare Advantage business profitability and a requirement that they remain within certain ranges of each other, in the aggregate may have a material adverse effect on our results of operations (including restricting revenue, enrollment and premium growth in certain products and market segments, restricting our ability to expand into new markets, increasing our medical and operating costs, further lowering our Medicare payment rates and increasing our expenses associated with the non-deductible health insurance industry fee and other assessments); our financial position (including our ability to maintain the value of our goodwill); and our cash flows (including the delayed receipt of amounts due under the commercial risk adjustment, risk corridor, and reinsurance provisions of the Health Care Reform Law). During 2015, we received our interim settlement associated with our risk corridor receivables for the 2014 coverage year. The interim settlement, representing only 12.6% of risk corridor receivables for the 2014 coverage year, was funded by HHS in accordance with previous guidance, utilizing funds HHS collected from us and other carriers under the 2014 risk corridor program. The risk corridor program is a three year program and HHS guidance provides that risk corridor collections over the life of the three year program will first be applied to any shortfalls from previous benefit years before application to current year obligations. Risk corridor payables to issuers are obligations of the United States Government under the Health Care Reform law which requires the Secretary of HHS to make full payments to issuers. In the event of a shortfall at the end of the three year program, HHS has asserted it will explore other sources of funding for risk corridor payments, subject to the availability of appropriations.

We intend for the discussion of our financial condition and results of operations that follows to assist in the understanding of our financial statements and related changes in certain key items in those financial statements from year to year, including the primary factors that accounted for those changes. Transactions between reportable segments primarily consist of sales of services rendered by our Healthcare Services segment, primarily pharmacy, provider, and home based services as well as clinical programs, to our Retail and Group customers and are described in Note 17to the consolidated financial statements included in Item 8. Financial Statements and Supplementary Data in this 2015 10-K.

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Comparison of Results of Operations for 2015 and 2014

Certain financial data on a consolidated basis and for our segments was as follows for the years ended December 31, 2015 and 2014:

Consolidated

							Change
	2015			2014			Dollars			Percentage
	(dollars in millions, except per common share results)
Revenues:
Premiums:
Retail	$	45,805		$	39,452		$	6,353		16.1	%
Group	6,569			6,456			113			1.8	%
Other Businesses	35			51			(16		)	(31.4	)%
Total premiums	52,409			45,959			6,450			14.0	%
Services:
Retail	9			39			(30		)	(76.9	)%
Group	698			763			(65		)	(8.5	)%
Healthcare Services	685			1,353			(668		)	(49.4	)%
Other Businesses	14			9			5			55.6	%
Total services	1,406			2,164			(758		)	(35.0	)%
Investment income	474			377			97			25.7	%
Total revenues	54,289			48,500			5,789			11.9	%
Operating expenses:
Benefits	44,269			38,166			6,103			16.0	%
Operating costs	7,318			7,639			(321		)	(4.2	)%
Depreciation and amortization	355			333			22			6.6	%
Total operating expenses	51,942			46,138			5,804			12.6	%
Income from operations	2,347			2,362			(15		)	(0.6	)%
Gain on sale of business	270			—			270			100.0	%
Interest expense	186			192			(6		)	(3.1	)%
Income before income taxes	2,431			2,170			261			12.0	%
Provision for income taxes	1,155			1,023			132			12.9	%
Net income	$	1,276		$	1,147		$	129		11.2	%
Diluted earnings per common share	$	8.44		$	7.36		$	1.08		14.7	%
Benefit ratio (a)	84.5		%	83.0		%				1.5	%
Operating cost ratio (b)	13.6		%	15.9		%				(2.3	)%
Effective tax rate	47.5		%	47.2		%				0.3	%

(a) Represents total benefits expense as a percentage of premiums revenue.

(b) Represents total operating costs, excluding depreciation and amortization, as a percentage of total revenues less investment income.

Summary

Net income was $1.3 billion, or $8.44 per diluted common share, in 2015 compared to $1.1 billion, or $7.36 per diluted common share, in 2014. The completion of the sale of Concentra on June 1, 2015 resulted in an after-tax gain

49

of $1.57 per diluted common share in 2015. Excluding the impact of the sale of Concentra, the decrease primarily was due to a decline in Retail segment pretax results, including expense of $0.74 per diluted common share for a premium deficiency reserve for certain of our individual commercial medical products for the 2016 coverage year, and an increase in the effective tax rate as discussed below. These items were partially offset by year-over-year improvement in the Group and Healthcare Services segment pretax results and higher investment income. In addition, 2015 includes expenses of $0.14 per diluted common share for transaction costs associated with the Merger, certain of which are not deductible for tax purposes. Net income for 2014 includes expenses of $0.15 per diluted common share associated with a loss on extinguishment of debt for the redemption of certain senior notes in 2014. Year-over-year comparisons of diluted earnings per common share are also favorably impacted by a lower number of shares used to compute diluted earnings per common share in 2015 reflecting the impact of share repurchases.

Premiums Revenue

Consolidated premiums increased$6.5 billion, or 14.0%, from 2014 to $52.4 billion for 2015 primarily reflecting higher premiums in both the Retail and Group segments. These higher premiums were primarily driven by average membership growth in the Retail segment and an increase in fully-insured group commercial medical per member premiums in the Group segment. Average membership is calculated by summing the ending membership for each month in a period and dividing the result by the number of months in a period. Premiums revenue reflects changes in membership and average per member premiums. Items impacting average per member premiums include changes in premium rates as well as changes in the geographic mix of membership, the mix of product offerings, and the mix of benefit plans selected by our membership.

Services Revenue

Consolidated services revenue decreased$758 million, or 35.0%, from 2014 to $1.4 billion for 2015 primarily due to the completion of the sale of Concentra on June 1, 2015 as well as the loss of certain large group ASO accounts as a result of continued discipline in pricing of services for self-funded accounts amid a highly competitive environment.

Investment Income

Investment income totaled $474 million for 2015, an increase of $97 million, or 25.7%, from 2014, primarily due to higher realized capital gains in 2015 as a result of the repositioning of our portfolio given recent market volatility and anticipated changes to interest rates, with higher average invested balances being substantially offset by lower interest rates.

Benefits Expense

Consolidated benefits expense was $44.3 billion for 2015, an increase of $6.1 billion, or 16.0%, from 2014 primarily due to an increase in the Retail segment mainly driven by higher average Medicare Advantage membership and individual commercial medical on-exchange and off-exchange membership in plans compliant with the Health Care Reform Law. As more fully described herein under the section entitled “Benefits Expense Recognition”, actuarial standards require the use of assumptions based on moderately adverse experience, which generally results in favorable reserve development, or reserves that are considered redundant. We experienced favorable medical claims reserve development related to prior fiscal years of $236 million in 2015 and $518 million in 2014. The decline in prior-period medical claims reserve development year over-year primarily was due to Medicare Advantage and individual commercial medical claims development in the Retail segment as discussed further in the segment results of operations discussion that follows.

The consolidated benefit ratio for 2015 was 84.5%, an increase of 150 basis points from 2014 primarily due to increases in the Retail segment, including the impact of a recognizing a premium deficiency reserve for certain of our individual commercial medical products for the 2016 coverage year, and Group segment ratios as discussed in the segment results of operations discussions that follows. The increase in benefits expense associated with the recognition of the premium deficiency reserve increased the consolidated benefit ratio by approximately 30 basis points in 2015. Favorable prior-period medical claims reserve development decreased the consolidated benefit ratio by approximately 50 basis points in 2015 versus approximately 110 basis points in 2014.

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Operating Costs

Our segments incur both direct and shared indirect operating costs. We allocate the indirect costs shared by the segments primarily as a function of revenues. As a result, the profitability of each segment is interdependent.

Consolidated operating costs decreased$321 million, or 4.2%, from 2014 to $7.3 billion in 2015 primarily due to cost management initiatives across all lines of business as well as the completion of the sale of Concentra on June 1, 2015, partially offset by increases in costs mandated by the Health Care Reform Law, including the non-deductible health insurance industry fee.

The consolidated operating cost ratio for 2015 was 13.6%, decreasing230 basis points from 2014 primarily due to decreases in the operating cost ratios in the Group and Retail segments reflecting cost management initiatives, as well as the completion of the sale of Concentra on June 1, 2015. Concentra carried a higher operating cost ratio.

Depreciation and Amortization

Depreciation and amortization for 2015 totaled $355 million, increasing$22 million, or 6.6% from 2014 reflecting higher depreciation expense from capital expenditures.

Interest Expense

Interest expense was $186 million for 2015 compared to $192 million for 2014, a decrease of $6 million, or 3.1%, primarily reflecting a higher average long-term debt balance due to the issuance of senior notes in September 2014, partially offset by the recognition of a loss on extinguishment of debt of approximately $37 million in October 2014 for the redemption of our $500 million 6.45% senior unsecured notes due June 1, 2016.

Income Taxes

Our effective tax rate during 2015 was 47.5% compared to the effective tax rate of 47.2% in 2014. The increase in the effective tax rate primarily was due to an increase in the non-deductible health insurance industry fee from 2014, substantially offset by the favorable tax effect of the gain on the sale of Concentra. See Note 11 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data for a complete reconciliation of the federal statutory rate to the effective tax rate. Our effective tax rate for 2016 is expected to be approximately 49% to 51%, excluding the impact of any non-deductible transaction costs associated with the Merger.

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Retail Segment

			Change
	2015	2014	Members		Percentage
Membership:
Medical membership:
Individual Medicare Advantage	2,753,400	2,427,900	325,500		13.4	%
Group Medicare Advantage	484,100	489,700	(5,600	)	(1.1	)%
Medicare stand-alone PDP	4,557,900	3,994,000	563,900		14.1	%
Total Retail Medicare	7,795,400	6,911,600	883,800		12.8	%
Individual commercial (a)	1,057,700	1,148,100	(90,400	)	(7.9	)%
State-based Medicaid	373,700	316,800	56,900		18.0	%
Total Retail medical members	9,226,800	8,376,500	850,300		10.2	%
Individual specialty membership (b)	1,153,100	1,165,800	(12,700	)	(1.1	)%

(a) Individual commercial medical membership includes Medicare Supplement members.

(b) Specialty products include dental, vision, and other supplemental health and financial protection products. Members included in these products may not be unique to each product since members have the ability to enroll in multiple products.

							Change
	2015			2014			Dollars			Percentage
	(in millions)
Premiums and Services Revenue:
Premiums:
Individual Medicare Advantage	$	29,526		$	25,782		$	3,744		14.5	%
Group Medicare Advantage	5,588			5,490			98			1.8	%
Medicare stand-alone PDP	3,846			3,404			442			13.0	%
Total Retail Medicare	38,960			34,676			4,284			12.4	%
Individual commercial	4,243			3,265			978			30.0	%
State-based Medicaid	2,341			1,255			1,086			86.5	%
Individual specialty	261			256			5			2.0	%
Total premiums	45,805			39,452			6,353			16.1	%
Services	9			39			(30		)	(76.9	)%
Total premiums and services revenue	$	45,814		$	39,491		$	6,323		16.0	%
Income before income taxes	$	930		$	1,339		$	(409	)	(30.5	)%
Benefit ratio	86.7		%	84.9		%				1.8	%
Operating cost ratio	11.2		%	11.6		%				(0.4	)%

Pretax Results

• Retail segment pretax income was $930 million in 2015, a decrease of $409 million, or 30.5%, compared to 2014 primarily driven by an increase in the benefit ratio for 2015, including the impact of recognizing a premium deficiency reserve of approximately $176 million for certain of our individual commercial medical products for the 2016 coverage year, partially offset by a decline in the operating cost ratio, Medicare Advantage membership growth, and higher investment income year-over-year.

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Enrollment

• Individual Medicare Advantage membership increased325,500 members, or 13.4%, from December 31, 2014 to December 31, 2015 reflecting net membership additions, particularly for our HMO offerings, for the 2015 plan year.

• Group Medicare Advantage membership decreased5,600 members, or 1.1%, from December 31, 2014 to December 31, 2015.

• Medicare stand-alone PDP membership increased563,900 members, or 14.1%, from December 31, 2014 to December 31, 2015reflecting net membership additions, primarily for our Humana-Walmart plan offering, for the 2015 plan year.

• Individual commercial medical membership decreased90,400 members, or 7.9%, from December 31, 2014 to December 31, 2015primarily reflecting the loss of approximately 150,000 members due to termination by CMS for lack of proper eligibility documentation from the member as well as the loss of members who had subscribed to plans that were not compliant with the Health Care Reform Law. These declines were partially offset by an increase in membership in plans that are compliant with the Health Care Reform Law, primarily off-exchange.

• State-based Medicaid membership increased56,900 members, or 18.0%, from December 31, 2014 to December 31, 2015primarily driven by the addition of members under our Florida Medicaid contract.

• Individual specialty membership decreased12,700 members, or 1.1%, from December 31, 2014 to December 31, 2015 primarily driven by a membership decline in supplemental health and financial protection product and vision offerings.

Premiums revenue

• Retail segment premiums increased$6.4 billion, or 16.1%, from 2014 to 2015 primarily due to membership growth across our Medicare Advantage, state-based Medicaid, and Medicare stand-alone PDP lines of business, as well as a heavier percentage of individual commercial medical business in higher premium plans compliant with the Health Care Reform Law. Average Medicare Advantage membership increased11.8% in 2015.

Benefits expense

• The Retail segment benefit ratio of 86.7% for 2015increased180 basis points from 2014 primarily due to higher than expected medical costs as compared to the assumptions used in our pricing, the recognition of a premium deficiency reserve in the fourth quarter of 2015 for certain of our individual commercial medical products for the 2016 coverage year, and unfavorable year-over-year comparisons of prior-period medical claims reserve development as discussed below. In addition, the increase reflects higher benefit ratios associated with a greater number of members from state-based contracts and the impact of the change in estimate for the 2014 net 3Rs receivables in 2015. These items were partially offset by the impact of the increase in the health insurance industry fee included in the pricing of our products. In addition, the 2015 period was favorably impacted by the release of reserves for future policy benefits as individual commercial medical members transitioned to plans compliant with the Health Care Reform Law.

We experienced higher than expected medical costs as compared to the assumptions used in our pricing for 2015 primarily due to lower-than-expected 2015 Medicare Advantage financial claim recovery levels and lower-than-anticipated reductions in inpatient admissions. In addition, medical claims associated with certain individual commercial medical products, in particular products compliant with the Health Care Reform Law, exceeded the assumptions used when we set pricing for 2015. We took a number of actions in 2015 to improve the profitability of our individual commercial medical business in 2016.These actions were subject to regulatory restrictions in certain geographies and included premium increases for the 2016 coverage year related generally to the first half of 2015 claims experience, the discontinuation of certain products as well as exit of certain markets for 2016, network improvements, enhancements to claims and clinical processes and

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administrative cost control. Despite these actions, the deterioration in the second half of 2015 claims experience together with 2016 open enrollment results indicating the retention of many high-utilizing members for 2016 resulted in a probable future loss. As a result of our assessment of the profitability of our individual medical policies compliant with the Health Care Reform Law, in the fourth quarter of 2015, we recorded a provision for probable future losses (premium deficiency reserve) for the 2016 coverage year of $176 million. The increase in benefits expense associated with the recognition of the premium deficiency reserve increased the Retail segment benefit ratio by approximately 40 basis points in 2015.

• The Retail segment’s benefits expense for 2015 included the beneficial effect of $228 million in favorable prior-year medical claims reserve development versus $488 million in 2014. This favorable prior-year medical claims reserve development decreased the Retail segment benefit ratio by approximately 50 basis points in 2015 versus approximately 120 basis points in 2014. The year-over-year decline in prior-period medical claims reserve development primarily was due to the impact of lower financial claim recoveries due in part to our gradual implementation during 2014 of inpatient authorization review prior to admission as opposed to post adjudication, as well as higher than expected flu associated claims from the fourth quarter of 2014 and continued volatility in claims associated with individual commercial medical products.

Operating costs

• The Retail segment operating cost ratio of 11.2% for 2015decreased40 basis points from 2014 primarily reflecting administrative cost efficiencies associated with medical membership growth in the segment and other discretionary cost reductions, partially offset by the increase in the non-deductible health insurance industry fee. The non-deductible health insurance industry fee increased the operating cost ratio by approximately 160 basis points in 2015 as compared to 120 basis points in 2014.

Group Segment

			Change
	2015	2014	Members		Percentage
Membership:
Medical membership:
Fully-insured commercial group	1,178,300	1,235,500	(57,200	)	(4.6	)%
ASO	710,700	1,104,300	(393,600	)	(35.6	)%
Military services	3,074,400	3,090,400	(16,000	)	(0.5	)%
Total group medical members	4,963,400	5,430,200	(466,800	)	(8.6	)%
Group specialty membership (a)	6,068,700	6,502,700	(434,000	)	(6.7	)%

(a) Specialty products include dental, vision, and other voluntary benefit products. Members included in these products may not be unique to each product since members have the ability to enroll in multiple products.

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							Change
	2015			2014			Dollars			Percentage
	(in millions)
Premiums and Services Revenue:
Premiums:
Fully-insured commercial group	$	5,493		$	5,339		$	154		2.9	%
Group specialty	1,055			1,098			(43		)	(3.9	)%
Military services	21			19			2			10.5	%
Total premiums	6,569			6,456			113			1.8	%
Services	698			763			(65		)	(8.5	)%
Total premiums and services revenue	$	7,267		$	7,219		$	48		0.7	%
Income before income taxes	$	258		$	151		$	107		70.9	%
Benefit ratio	80.2		%	79.5		%				0.7	%
Operating cost ratio	24.0		%	26.5		%				(2.5	)%

Pretax Results

• Group segment pretax income increased$107 million, or 70.9%, to $258 million in 2015 primarily reflecting improvement in the operating cost ratio partially offset by an increase in the benefit ratio as discussed below.

Enrollment

• Fully-insured commercial group medical membership decreased57,200 members, or 4.6% from December 31, 2014 reflecting lower membership in both large and small group accounts.

• Group ASO commercial medical membership decreased393,600 members, or 35.6%, from December 31, 2014 to December 31, 2015 primarily due to the loss of certain large group accounts as a result of continued discipline in pricing of services for self-funded accounts amid a highly competitive environment.

• Group specialty membership decreased434,000 members, or 6.7%, from December 31, 2014 to December 31, 2015 primarily due to the loss of certain fully-insured group medical accounts that also had specialty coverage.

Premiums revenue

• Group segment premiums increased$113 million, or 1.8%, from 2014 to 2015 primarily due to an increase in fully-insured commercial medical per member premiums partially offset by a net decline in fully-insured commercial medical membership.

Services revenue

• Group segment services revenue decreased$65 million, or 8.5%, from 2014 to 2015 primarily due to a decline in group ASO commercial medical membership.

Benefits expense

• The Group segment benefit ratio increased70 basis points from 79.5% in 2014 to 80.2% in 2015 primarily reflecting the impact of higher specialty drug costs, net of rebates, as well as higher outpatient costs and lower prior-period medical claims reserve development, partially offset by an increase in the non-deductible health insurance industry fee included in the pricing of our products.

• The Group segment’s benefits expense included the beneficial effect of $7 million in favorable prior-year medical claims reserve development versus $29 million in 2014. This favorable prior-year medical claims reserve development decreased the Group segment benefit ratio by approximately 10 basis points in 2015 versus approximately 40 basis points in 2014. The year-over-year decline in favorable prior-period medical

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claims reserve development primarily was due to a relatively small number of higher severity claims in the 2015 period associated with prior periods.

Operating costs

• The Group segment operating cost ratio of 24.0% for 2015decreased250 basis points from 26.5% for 2014, reflecting a decline in our group ASO commercial medical membership which carries a higher operating cost ratio than our fully-insured commercial medical membership, as well as operating cost efficiencies associated with our fully-insured business. Operating cost efficiencies were the result of both sustainable cost reduction initiatives and discretionary reductions. These declines were partially offset by the impact of an increase in the non-deductible health insurance industry fee. The non-deductible health insurance industry fee increased the operating cost ratio by approximately 140 basis points in 2015 as compared to 100 basis points in 2014.

Healthcare Services Segment

							Change
	2015			2014			Dollars			Percentage
	(in millions)
Revenues:
Services:
Provider services	$	515		$	1,147		$	(632	)	(55.1	)%
Home based services	140			107			33			30.8	%
Pharmacy solutions	30			99			(69		)	(69.7	)%
Total services revenues	685			1,353			(668		)	(49.4	)%
Intersegment revenues:
Pharmacy solutions	20,551			16,905			3,646			21.6	%
Provider services	1,291			1,149			142			12.4	%
Home based services	875			585			290			49.6	%
Clinical programs	203			208			(5		)	(2.4	)%
Total intersegment revenues	22,920			18,847			4,073			21.6	%
Total services and intersegment revenues	$	23,605		$	20,200		$	3,405		16.9	%
Income before income taxes	$	981		$	738		$	243		32.9	%
Operating cost ratio	95.2		%	95.6		%				(0.4	)%

Pretax results

• Healthcare Services segment pretax income of $981 million for 2015increased$243 million, or 32.9%, from 2014 primarily due to higher earnings from our pharmacy solutions and home based services businesses as they serve our growing Medicare membership.

Script Volume

• Humana Pharmacy Solutions^® script volumes for the Retail and Group segment membership increased to approximately 398 million in 2015, up21% versus scripts of approximately 329 million in 2014. The increase primarily reflects growth associated with higher average medical membership for 2015 than in 2014.

Services revenue

• Services revenue decreased$668 million, or 49.4%, from 2014 to $685 million for 2015 primarily due to the completion of the sale of Concentra on June 1, 2015.

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Intersegment revenues

• Intersegment revenues increased$4.1 billion, or 21.6%, from 2014 to $22.9 billion for 2015 primarily due to growth in our Medicare membership which resulted in higher utilization of our Healthcare Services segment businesses.

Operating costs

• The Healthcare Services segment operating cost ratio of 95.2% for 2015decreased40 basis points from 95.6% for 2014 primarily due to lower operating costs in our pharmacy business together with discretionary cost reductions across the segment, partially offset by the increasing percentage of pharmacy business associated with lower margin specialty drugs. Improving operating efficiency in the pharmacy business was primarily driven by lower cost of goods associated with increased purchasing scale and lower cost-to-fill primarily due to improvements in technology.

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Comparison of Results of Operations for 2014 and 2013

Certain financial data on a consolidated basis and for our segments was as follows for the years ended December 31, 2014 and 2013:

Consolidated

							Change
	2014			2013			Dollars			Percentage
	(dollars in millions, except per common share results)
Revenues:
Premiums:
Retail	$	39,452		$	31,922		$	7,530		23.6	%
Group	6,456			6,237			219			3.5	%
Other Businesses	51			670			(619		)	(92.4	)%
Total premiums	45,959			38,829			7,130			18.4	%
Services:
Retail	39			18			21			116.7	%
Group	763			735			28			3.8	%
Healthcare Services	1,353			1,350			3			0.2	%
Other Businesses	9			6			3			50.0	%
Total services	2,164			2,109			55			2.6	%
Investment income	377			375			2			0.5	%
Total revenues	48,500			41,313			7,187			17.4	%
Operating expenses:
Benefits	38,166			32,564			5,602			17.2	%
Operating costs	7,639			6,355			1,284			20.2	%
Depreciation and amortization	333			333			—			—	%
Total operating expenses	46,138			39,252			6,886			17.5	%
Income from operations	2,362			2,061			301			14.6	%
Interest expense	192			140			52			37.1	%
Income before income taxes	2,170			1,921			249			13.0	%
Provision for income taxes	1,023			690			333			48.3	%
Net income	$	1,147		$	1,231		$	(84	)	(6.8	)%
Diluted earnings per common share	$	7.36		$	7.73		$	(0.37	)	(4.8	)%
Benefit ratio (a)	83.0		%	83.9		%				(0.9	)%
Operating cost ratio (b)	15.9		%	15.5		%				0.4	%
Effective tax rate	47.2		%	35.9		%				11.3	%

(a) Represents total benefits expense as a percentage of premiums revenue.

(b) Represents total operating costs, excluding depreciation and amortization, as a percentage of total revenues less investment income.

Summary

Net income was $1.1 billion, or $7.36 per diluted common share, in 2014 compared to $1.2 billion, or $7.73 per diluted common share, in 2013. Net income for 2014 includes expenses of $0.15 per diluted common share associated with a loss on extinguishment of debt for the redemption of certain senior notes in 2014 and net income for 2013 includes benefits expense of $0.99 per diluted common share for reserve strengthening associated with our closed-

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block of long-term care insurance policies included with Other Businesses as discussed in Note 18 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data as well as the benefit of a reduction in benefits expense in 2013 related to a favorable settlement of contract claims with the DoD. Excluding these items, the increase in net income primarily resulted from higher pretax income in our Healthcare Services segment substantially offset by lower pretax income in our Retail and Group segments. In addition, 2014 was favorably impacted by a lower number of shares used to compute diluted earnings per common share reflecting the impact of share repurchases.

Premiums Revenue

Consolidated premiums increased$7.1 billion, or 18.4%, from 2013 to $46.0 billion for 2014 primarily due to increases in both Retail and Group segment premiums mainly driven by higher average individual and group Medicare Advantage membership as well as higher individual commercial medical membership. In addition, year-over-year comparisons to 2013 were negatively impacted by sequestration which became effective April 1, 2013. Premiums revenue for our Other Businesses declined primarily due to the loss of our Puerto Rico Medicaid contracts effective September 30, 2013.

Services Revenue

Consolidated services revenue increased$55 million, or 2.6%, from 2013 to $2.2 billion for 2014 primarily due to an increase in services revenue in our Retail segment due to the acquisition of American Eldercare in September 2013.

Investment Income

Investment income totaled $377 million for 2014, an increase of $2 million from 2013, as higher average invested balances were partially offset by lower interest rates.

Benefits Expense

Consolidated benefits expense was $38.2 billion for 2014, an increase of $5.6 billion, or 17.2%, from 2013 primarily due to increases in both the Retail and Group segments mainly driven by higher average individual and group Medicare Advantage membership as well as higher individual commercial medical membership. We experienced favorable medical claims reserve development related to prior fiscal years of $518 million in 2014 and $474 million in 2013. These increases in favorable medical claims reserve development primarily resulted from increased membership and better than originally expected utilization across most of our major business lines and increased financial recoveries. The increase in financial recoveries primarily resulted from claim audit process enhancements as well as increased volume of claim audits and expanded audit scope. All lines of business benefited from these improvements.

The consolidated benefit ratio for 2014 was 83.0%, a decrease of 90 basis points from 2013 primarily due to reserve strengthening in 2013 associated with our closed-block of long-term care insurance policies included with Other Businesses as discussed above, as well as the loss of our Medicaid contracts in Puerto Rico effective September 30, 2013 which more than offset higher ratios year-over-year in the Retail and Group segments.

Operating Costs

Our segments incur both direct and shared indirect operating costs. We allocate the indirect costs shared by the segments primarily as a function of revenues. As a result, the profitability of each segment is interdependent.

Consolidated operating costs increased$1,284 million, or 20.2%, in 2014 compared to 2013 primarily due to costs mandated by the Health Care Reform Law, including the non-deductible health insurance industry fee, and investments in health care exchanges and state-based contracts, partially offset by operating cost efficiencies.

The consolidated operating cost ratio for 2014 was 15.9%, increasing40 basis points from 2013 primarily due to increases in the operating cost ratios in our Retail and Group segments due to the same factors impacting consolidated operating costs as described above.

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Depreciation and Amortization

Depreciation and amortization for 2014 totaled $333 million, unchanged from 2013.

Interest Expense

Interest expense was $192 million for 2014 compared to $140 million for 2013, an increase of $52 million, or 37.1%. In September 2014, we issued $400 million of 2.625% senior notes due October 1, 2019, $600 million of 3.85% senior notes due October 1, 2024 and $750 million of 4.95% senior notes due October 1, 2044. In October 2014, we redeemed the $500 million 6.45% senior unsecured notes due June 1, 2016, at 100%of the principal amount plus applicable premium for early redemption and accrued and unpaid interest to the redemption date, We recognized a loss on extinguishment of debt of approximately $37 million in October 2014 for the redemption of these notes.

Income Taxes

Our effective tax rate during 2014 was 47.2% compared to the effective tax rate of 35.9% in 2013. The non-deductible nature of the health insurance industry fee levied on the insurance industry beginning in 2014 as mandated by the Health Care Reform Law increased our effective tax rate by approximately 9.4 percentage points for 2014.

Retail Segment

			Change
	2014	2013	Members	Percentage
Membership:
Medical membership:
Individual Medicare Advantage	2,427,900	2,068,700	359,200	17.4	%
Group Medicare Advantage	489,700	429,100	60,600	14.1	%
Medicare stand-alone PDP	3,994,000	3,275,900	718,100	21.9	%
Total Retail Medicare	6,911,600	5,773,700	1,137,900	19.7	%
Individual commercial (a)	1,148,100	600,100	548,000	91.3	%
State-based Medicaid	316,800	85,500	231,300	270.5	%
Total Retail medical members	8,376,500	6,459,300	1,917,200	29.7	%
Individual specialty membership (b)	1,165,800	1,042,500	123,300	11.8	%

(a) Individual commercial medical membership includes Medicare Supplement members.

(b) Specialty products include dental, vision, and other supplemental health and financial protection products. Members included in these products may not be unique to each product since members have the ability to enroll in multiple products.

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							Change
	2014			2013			Dollars			Percentage
	(in millions)
Premiums and Services Revenue:
Premiums:
Individual Medicare Advantage	$	25,782		$	22,481		$	3,301		14.7	%
Group Medicare Advantage	5,490			4,710			780			16.6	%
Medicare stand-alone PDP	3,404			3,033			371			12.2	%
Total Retail Medicare	34,676			30,224			4,452			14.7	%
Individual commercial	3,265			1,160			2,105			181.5	%
State-based Medicaid	1,255			328			927			282.6	%
Individual specialty	256			210			46			21.9	%
Total premiums	39,452			31,922			7,530			23.6	%
Services	39			18			21			116.7	%
Total premiums and services revenue	$	39,491		$	31,940		$	7,551		23.6	%
Income before income taxes	$	1,339		$	1,490		$	(151	)	(10.1	)%
Benefit ratio	84.9		%	85.1		%				(0.2	)%
Operating cost ratio	11.6		%	10.1		%				1.5	%

Pretax Results

• Retail segment pretax income was $1.3 billion in 2014, a decrease of $151 million, or 10.1%, compared to 2013 primarily driven by investment spending for health care exchanges and state-based contracts and higher specialty prescription drug costs associated with a new treatment for Hepatitis C, partially offset by Medicare Advantage and individual commercial medical membership growth as well as increased membership in our clinical programs.

Enrollment

• Individual Medicare Advantage membership increased359,200 members, or 17.4%, from December 31, 2013 to December 31, 2014 reflecting net membership additions, particularly for our HMO offerings, for the 2014 plan year.

• Fully-insured group Medicare Advantage membership increased60,600 members, or 14.1%, from December 31, 2013 to December 31, 2014 primarily due to the addition of a new large group account.

• Medicare stand-alone PDP membership increased718,100 members, or 21.9%, from December 31, 2013 to December 31, 2014 reflecting net membership additions, primarily for our Humana-Walmart plan offering, for the 2014 plan year.

• Individual commercial medical membership increased548,000 members, or 91.3%, from December 31, 2013 to December 31, 2014 primarily reflecting new sales, both on-exchange and off-exchange, of plans compliant with the Health Care Reform Law.

• State-based Medicaid membership increased231,300 members, or 270.5%, from December 31, 2013 to December 31, 2014 primarily driven by the addition of members under our Florida Medicaid and Florida Long-Term Support Services contracts as well as 18,300 dual eligible members from state-based contracts in Virginia and Illinois.

• Individual specialty membership increased123,300 members, or 11.8%, from December 31, 2013 to December 31, 2014 primarily driven by increased membership in dental and vision offerings.

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Premiums revenue

• Retail segment premiums increased$7.5 billion, or 23.6%, from 2013 to 2014 primarily due to membership growth across all lines of business, particularly for our Medicare Advantage, individual commercial medical, primarily on the health care exchanges, and state-based Medicaid businesses. Individual Medicare Advantage average membership increased16.6% in 2014. Individual Medicare Advantage per member premiums decreased approximately 1.7% in 2014 compared to 2013, primarily due to Medicare rate reductions and the impact of sequestration which became effective on April 1, 2013.

Benefits expense

• The Retail segment benefit ratio of 84.9% for 2014decreased20 basis points from 2013 primarily due to increased membership in our clinical programs and the inclusion of the health insurance industry fee in the pricing of our products, partially offset by higher specialty prescription drug costs associated with a new treatment for Hepatitis C, higher planned clinical investment spending, and higher benefit ratios associated with members from state-based contracts.

• The Retail segment’s benefits expense for 2014 included the beneficial effect of $488 million in favorable prior-year medical claims reserve development versus $428 million in 2013. This favorable prior-year medical claims reserve development decreased the Retail segment benefit ratio by approximately 120 basis points in 2014 versus approximately 130 basis points in 2013.

Operating costs

• The Retail segment operating cost ratio of 11.6% for 2014increased150 basis points from 2013 primarily due to the non-deductible health insurance industry fee mandated by the Health Care Reform Law and investment spending for health care exchanges and state-based contracts, partially offset by scale efficiencies from Medicare and individual commercial medical membership growth.

Group Segment

			Change
	2014	2013	Members		Percentage
Membership:
Medical membership:
Fully-insured commercial group	1,235,500	1,237,000	(1,500	)	(0.1	)%
ASO	1,104,300	1,162,800	(58,500	)	(5.0	)%
Military services	3,090,400	3,101,800	(11,400	)	(0.4	)%
Total group medical members	5,430,200	5,501,600	(71,400	)	(1.3	)%
Group specialty membership (a)	6,502,700	6,780,800	(278,100	)	(4.1	)%

(a) Specialty products include dental, vision, and voluntary benefit products. Members included in these products may not be unique to each product since members have the ability to enroll in multiple products.

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							Change
	2014			2013			Dollars			Percentage
	(in millions)
Premiums and Services Revenue:
Premiums:
Fully-insured commercial group	$	5,339		$	5,117		$	222		4.3	%
Group specialty	1,098			1,095			3			0.3	%
Military services	19			25			(6		)	(24.0	)%
Total premiums	6,456			6,237			219			3.5	%
Services	763			735			28			3.8	%
Total premiums and services revenue	$	7,219		$	6,972		$	247		3.5	%
Income before income taxes	$	151		$	240		$	(89	)	(37.1	)%
Benefit ratio	79.5		%	77.7		%				1.8	%
Operating cost ratio	26.5		%	26.5		%				—	%

Pretax Results

• Group segment pretax income decreased$89 million, or 37.1%, to $151 million in 2014 primarily reflecting higher utilization, mainly due to higher specialty prescription drug costs associated with a new treatment for Hepatitis C, as well as the continuing impact of transitional policy changes which allowed individuals to remain in plans not compliant with the Health Care Reform Law.

Enrollment

• Fully-insured commercial group medical membership decreased1,500 members, or 0.1% from December 31, 2013 as an increase in small group business membership was generally offset by lower membership in large group accounts. Approximately 65% of our fully-insured commercial group medical membership was in small group accounts at December 31, 2014 compared to 61% at December 31, 2013.

• Group ASO commercial medical membership decreased58,500 members, or 5.0%, from December 31, 2013 to December 31, 2014 primarily due to continued pricing discipline in a highly competitive environment for self-funded accounts.

• Group specialty membership decreased278,100 members, or 4.1%, from December 31, 2013 to December 31, 2014 primarily due to declines in dental and vision membership related to our planned discontinuance of certain unprofitable product distribution partnerships.

Premiums revenue

• Group segment premiums increased$219.0 million, or 3.5%, from 2013 to 2014 primarily due to higher fully-insured commercial group medical premiums per member that more than offset a slight decline in total membership for this segment.

Benefits expense

• The Group segment benefit ratio increased180 basis points from 77.7% in 2013 to 79.5% in 2014 primarily due to higher utilization, mainly due to higher specialty prescription drug costs associated with a new treatment for Hepatitis C, as well as the continuing impact of transitional policy changes, partially offset by the inclusion of the health insurance industry fee and other fees mandated by the Health Care Reform Law in our pricing.

• The Group segment’s benefits expense included the beneficial effect of $29 million in favorable prior-year medical claims reserve development versus $42 million in 2013. This favorable prior-year medical claims reserve development decreased the Group segment benefit ratio by approximately 40 basis points in 2014 versus approximately 70 basis points in 2013.

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Operating costs

• The Group segment operating cost ratio of 26.5% was unchanged from 2013, reflecting the impact of the non-deductible health insurance industry fee and other fees mandated by the Health Care Reform Law as well as a higher percentage of small group commercial business which carries a higher operating cost ratio than large group business, offset by operating cost efficiencies.

Healthcare Services Segment

							Change
	2014			2013			Dollars			Percentage
	(in millions)
Revenues:
Services:
Provider services	$	1,147		$	1,195		$	(48	)	(4.0	)%
Home based services	107			94			13			13.8	%
Pharmacy solutions	99			59			40			67.8	%
Clinical programs	—			2			(2		)	(100.0	)%
Total services revenues	1,353			1,350			3			0.2	%
Intersegment revenues:
Pharmacy solutions	16,905			13,079			3,826			29.3	%
Provider services	1,149			1,102			47			4.3	%
Home based services	585			326			259			79.4	%
Clinical programs	208			186			22			11.8	%
Total intersegment revenues	18,847			14,693			4,154			28.3	%
Total services and intersegment revenues	$	20,200		$	16,043		$	4,157		25.9	%
Income before income taxes	$	738		$	520		$	218		41.9	%
Operating cost ratio	95.6		%	95.8		%				(0.2	)%

Pretax results

• Healthcare Services segment pretax income of $738 million for 2014increased$218 million from 2013. The increase is primarily due to a decline in the operating cost ratio in 2014 on a revenue base that reflects growth from our pharmacy solutions and home based services businesses as they serve our growing Medicare membership.

Script Volume

• Humana Pharmacy Solutions^® script volumes for the Retail and Group segment membership increased to approximately 329 million in 2014, up20% versus scripts of approximately 274 million in 2013. The increase primarily reflects growth associated with higher average medical membership for 2014 than in 2013.

Services revenue

• Services revenue for 2014 were relatively unchanged from 2013, increasing$3 million, or 0.2%, to $1.4 billion for 2014.

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Intersegment revenues

• Intersegment revenues increased$4.2 billion, or 28.3%, from 2013 to $18.8 billion for 2014 primarily due to growth in our Medicare membership which resulted in higher utilization of our pharmacy solutions and home based services businesses.

Operating costs

• The Healthcare Services segment operating cost ratio of 95.6% for 2014decreased20 basis points from 95.8% for 2013 primarily due to an improvement in the ratio for our pharmacy solutions business partially offset by our investment in home based services and other businesses across the segment.

Other Businesses

Our Other Businesses pretax income of $1 million for 2014 compared to a pretax loss of $289 million for 2013. The pretax loss in 2013 included net expense of $243 million for reserve strengthening for our closed-block of long-term care insurance policies further discussed in Note 18 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data. Year-over-year comparisons also reflect the loss of our Medicaid contracts in Puerto Rico effective September 30, 2013.

Liquidity

The Merger Agreement includes customary restrictions on the conduct of our business prior to the completion of the Merger, generally requiring us to conduct our business in the ordinary course and subjecting us to a variety of specified limitations absent Aetna’s prior written consent. Historically, our primary sources of cash have included receipts of premiums, services revenue, and investment and other income, as well as proceeds from the sale or maturity of our investment securities, borrowings, and proceeds from sales of businesses. Our primary uses of cash historically have included disbursements for claims payments, operating costs, interest on borrowings, taxes, purchases of investment securities, acquisitions, capital expenditures, repayments on borrowings, dividends, and share repurchases. Because premiums generally are collected in advance of claim payments by a period of up to several months, our business normally should produce positive cash flows during periods of increasing premiums and enrollment. Conversely, cash flows would be negatively impacted during periods of decreasing premiums and enrollment. From period to period, our cash flows may also be affected by the timing of working capital items including premiums receivable, benefits payable, and other receivables and payables. Our cash flows are impacted by the timing of payments to and receipts from CMS associated with Medicare Part D subsidies for which we do not assume risk. The use of operating cash flows may be limited by regulatory requirements of state departments of insurance (or comparable state regulators) which require, among other items, that our regulated subsidiaries maintain minimum levels of capital and seek approval before paying dividends from the subsidiaries to the parent. Our use of operating cash flows derived from our non-insurance subsidiaries, such as in our Healthcare Services segment, is generally not restricted by state departments of insurance (or comparable state regulators).

The effect of the commercial risk adjustment, risk corridor, and reinsurance provisions of the Health Care Reform Law impact the timing of our operating cash flows, as we build receivables for each coverage year that are expected to be collected in subsequent coverage years. On June 30, 2015 we received notification from CMS of risk adjustment and reinsurance settlement amounts for 2014. During 2015, we collected $392 million net for risk adjustment and reinsurance recoverable settlements associated with the 2014 coverage year. In addition, during 2015, we received our interim settlement associated with our risk corridor receivables for the 2014 coverage year. The interim settlement, representing only 12.6% of risk corridor receivables for the 2014 coverage year, was funded by HHS in accordance with previous guidance, utilizing funds HHS collected from us and other carriers under the 2014 risk corridor program. We collected $25 million net of payments for risk corridor associated with the 2014 coverage year during 2015. HHS provided guidance under the three year risk corridor program that future collections will first be applied to any shortfalls from previous coverage years before application to current year obligations. Risk corridor payables to issuers are obligations of the United States Government under the Health Care Reform law which requires the Secretary of HHS to make full payments to issuers. In the event of a shortfall at the end of the three year program, HHS has asserted it will explore other sources of funding for risk corridor payments, subject to the availability of appropriations. The

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remaining net receivable balance associated with the 3Rs was approximately $982 million at December 31, 2015, including $219 million related to the 2014 coverage year, and $679 million at December 31, 2014. Any amounts receivable or payable associated with these risk limiting programs may have an impact on subsidiary liquidity, with any temporary shortfalls funded by the parent company.

For additional information on our liquidity risk, please refer to Item 1A. – Risk Factors in this 2015 Form 10-K.

Cash and cash equivalents increased to $2.6 billion at December 31, 2015 from $1.9 billion at December 31, 2014. The change in cash and cash equivalents for the years ended December 31, 2015, 2014 and 2013 is summarized as follows:

	2015			2014			2013
	(in millions)
Net cash provided by operating activities	$	868		$	1,618		$	1,716
Net cash provided by (used in) investing activities	320			(63		)	(1,182		)
Net cash used in financing activities	(552		)	(758		)	(702		)
Increase (decrease) in cash and cash equivalents	$	636		$	797		$	(168	)

Cash Flow from Operating Activities

The change in operating cash flows over the three year period primarily results from the corresponding change in earnings, enrollment activity, and the timing of working capital items as discussed below. The lower operating cash flows in 2015 primarily reflect the effect of significant growth in individual commercial medical and group Medicare Advantage membership in 2014 and changes in the timing of working capital items related to the growth in our pharmacy business. Operating cash flows for 2014 were favorably impacted and conversely operating cash flows for 2015 were negatively impacted from the typical pattern of claim payments that lagged premium receipts related to new membership in 2014. Individual commercial medical added 548,000 new members in 2014 compared to a decline of 90,400 members in 2015. Likewise, group Medicare Advantage added 60,600 new members in 2014 compared to a decline of 5,600 members in 2015. In addition, 2015 and 2014 operating cash flows were impacted by increased receivables associated with the 3Rs.

The most significant drivers of changes in our working capital are typically the timing of payments of benefits expense and receipts for premiums. We illustrate these changes with the following summaries of benefits payable and receivables.

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The detail of benefits payable was as follows at December 31, 2015, 2014 and 2013:

							Change
	2015		2014		2013		2015			2014			2013
	(in millions)
IBNR (1)	$	3,730	$	3,254	$	2,586	$	476		$	668		$	34
Reported claims in process (2)	600		475		381		125			94			66
Premium deficiency reserve (3)	176		—		—		176			—			—
Other benefits payable (4)	470		746		926		(276		)	(180		)	14
Total benefits payable	$	4,976	$	4,475	$	3,893	501			582			114
Payables from acquisition							—			—			(5		)
Change in benefits payable per cash flow statement resulting in cash from operations							$	501		$	582		$	109

(1) IBNR represents an estimate of benefits payable for claims incurred but not reported (IBNR) at the balance sheet date and includes unprocessed claim inventories. The level of IBNR is primarily impacted by membership levels, medical claim trends and the receipt cycle time, which represents the length of time between when a claim is initially incurred and when the claim form is received (i.e. a shorter time span results in a lower IBNR).

(2) Reported claims in process represents the estimated valuation of processed claims that are in the post claim adjudication process, which consists of administrative functions such as audit and check batching and handling, as well as amounts owed to our pharmacy benefit administrator which fluctuate due to bi-weekly payments and the month-end cutoff.

(3) Premium deficiency reserve recognized in 2015 for our individual commercial medical business compliant with the Health Care Reform Law associated with the 2016 coverage year.

(4) Other benefits payable include amounts owed to providers under capitated and risk sharing arrangements.

The increases in benefits payable in 2015 and 2014 largely were due to an increase in IBNR. IBNR increased during 2015 primarily as a result of individual Medicare Advantage membership growth while during 2014 IBNR also increased as a result of individual Medicare Advantage membership growth as well as significant growth in individual commercial medical and group Medicare Advantage membership. As discussed previously, our cash flows are impacted by changes in enrollment. In 2014 (the first year plans compliant with the Health Care Reform Law were effective), membership in new fully-insured individual commercial medical plans compliant with the Health Care Reform Law grew as compared with a decline in membership in these plans in 2015. Similarly, growth in group Medicare Advantage membership in 2014 favorably impacted the 2014 cash flows while a decline in group Medicare Advantage membership in 2015 negatively impacted the 2015 cash flows.

In addition, the increase in benefits payable in 2015 reflects the recognition of a premium deficiency reserve associated with our individual commercial medical products compliant with the Health Care Reform Law for the 2016 coverage year. An increase in the amount of processed but unpaid claims due to our pharmacy benefit administrator, which fluctuates due to month-end cutoff, also contributed to the benefits payable increase in each of 2015 and 2014. These items were partially offset by a decrease in amounts owed to providers under capitated and risk sharing arrangements in both 2015 and 2014, including the disbursement of a portion of our Medicare risk adjustment collections under our contractual obligations associated with our risk sharing arrangements. The increase in benefits payable in 2013 primarily was due to an increase in the amount of processed but unpaid claims due to our pharmacy benefit administrator and an increase in IBNR, primarily as a result of Medicare Advantage membership growth.

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The detail of total net receivables was as follows at December 31, 2015, 2014 and 2013:

										Change
	2015			2014			2013			2015			2014			2013
	(in millions)
Medicare	$	765		$	664		$	576		$	101		$	88		$	154
Commercial and other	420			381			219			39			162			59
Military services	77			106			87			(29		)	19			28
Allowance for doubtful accounts	(101		)	(98		)	(71		)	(3		)	(27		)	(24		)
Total net receivables	$	1,161		$	1,053		$	811		108			242			217
Reconciliation to cash flow statement:
Provision for doubtful accounts										61			32			37
Change in receivables acquired, held-for-sale, or disposed from sale of business										11			(10		)	(3		)
Change in receivables per cash flow statement resulting in cash from operations										$	180		$	264		$	251

As disclosed previously, on June 1, 2015, we completed the sale of our wholly owned subsidiary Concentra. Net receivables associated with Concentra were classified as held-for-sale at December 31, 2014 and December 31, 2013 and excluded from the table above for comparative purposes.

Medicare receivables are impacted by revenue growth associated with growth in individual and group Medicare membership and the timing of accruals and related collections associated with the CMS risk-adjustment model.

The increases in commercial and other receivables in each of 2015, 2014, and 2013 primarily are due to growth in the business. Excluding the effect of classifying Concentra receivables as held-for-sale at December 31, 2014, the increase in commercial and other receivables from 2013 to 2014 is primarily due to the commercial risk adjustment provision of the Health Care Reform Law which became effective in 2014.

Military services receivables at December 31, 2015, 2014, and 2013 primarily consist of administrative services only fees owed from the federal government for administrative services provided under our current TRICARE South Region contract.

Many provisions of the Health Care Reform Law became effective in 2014, including the commercial risk adjustment, risk corridor, and reinsurance provisions as well as the non-deductible health insurance industry fee. As discussed previously, the timing of payments and receipts associated with these provisions impact our operating cash flows as we build receivables for each coverage year that are expected to be collected in subsequent coverage years. The net receivable balance associated with the 3Rs was approximately $982 million at December 31, 2015 and $679 million at December 31, 2014, including certain amounts recorded in receivables as noted above. In 2015, we paid the federal government $867 million for the annual health insurance industry fee compared to our payment of $562 million in 2014.

In addition to the timing of payments of benefits expense, receipts for premiums and services revenues, and amounts due under the risk limiting and health insurance industry fee provisions of the Health Care Reform Law, other items impacting operating cash flows primarily resulted from the timing of working capital related to the growth in our pharmacy and payments for the Medicare Part D risk corridor provisions of our contracts with CMS.

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Cash Flow from Investing Activities

On June 1, 2015, we completed the sale of Concentra for approximately $1,055 million in cash, excluding approximately $22 million of transaction costs.

Our ongoing capital expenditures primarily relate to our information technology initiatives, support of services in our provider services operations including medical and administrative facility improvements necessary for activities such as the provision of care to members, claims processing, billing and collections, wellness solutions, care coordination, regulatory compliance and customer service. Total capital expenditures, excluding acquisitions, were $523 million in 2015, $528 million in 2014, and $441 million in 2013.

In 2015, we purchased a $284 millionnote receivable directly from a third-party bank syndicate related to the financing of MCCI Holdings, LLC's business as described in Note 2 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data. The purchase of this note is included with purchases of investment securities in our consolidated statement of cash flows.

Proceeds from sales and maturities of investment securities exceeded purchases by$103 million in 2015 and $411 million in 2014. These net proceeds were used to fund normal working capital needs due to an increase in receivables associated with the 3Rs in addition to the timing of payments to and receipts from CMS associated with Medicare Part D reinsurance subsidies, as discussed below. We reinvested a portion of our operating cash flows in investment securities, primarily investment-grade fixed income securities, totaling$592 million in 2013.

Cash consideration paid for acquisitions, net of cash acquired, was $38 million in 2015, $18 million in 2014, and $187 million in 2013. Acquisitions in 2015 and 2014 included health and wellness related acquisitions. Cash paid for acquisitions in 2013 primarily related to the American Eldercare and other health and wellness related acquisitions.

Cash Flow from Financing Activities

Claims payments were$361 millionhigher than receipts from CMS associated with Medicare Part D claim subsidies for which we do not assume risk during 2015, $945 million higher during 2014, and $155 million higher during 2013. Our 2014 financing cash flows were negatively impacted by the timing of payments to and receipts from CMS associated with Medicare Part D claim subsidies for which we do not assume risk. We experienced higher specialty prescription drug costs associated with a new treatment for Hepatitis C than were contemplated in our bids which resulted in higher subsidy receivable balances in 2014 that were settled in 2015 under the terms of our contracts with CMS. Our net receivable for CMS subsidies and brand name prescription drug discounts was $2.0 billion at December 31, 2015 compared to $1.7 billion at December 31, 2014. Refer to Note 6 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

Under our administrative services only TRICARE South Region contract, health care cost payments for which we do not assume risk exceeded reimbursements from the federal government by $4 million in 2015 and were less than reimbursements from the federal government by $5 million in 2013. Reimbursements from the federal government equaled health care cost payments for which we do not assume risk in 2014. Receipts from HHS associated with cost sharing provisions of the Health Care Reform Law for which we do not assume risk werehigher than claims payments by $69 million in 2015 and $26 million in 2014. See Note 2 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data for further description.

We repurchased 1.9 million shares for $329 million in 2015, 5.7 million shares for $730 million in 2014 (excludes another $100 million held back pending final settlement of an accelerated stock repurchase plan in March 2015), and 5.8 million shares for $502 million in 2013 under share repurchase plans authorized by the Board of Directors. We also acquired common shares in connection with employee stock plans for an aggregate cost of $56 million in 2015, $42 million in 2014, and $29 million in 2013.

As discussed further below, we paid dividends to stockholders of $172 million in each of 2015 and 2014 and $168 million in 2013.

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We entered into a commercial paper program in October 2014. Net proceeds from the issuance of commercial paper were $298 million2015 and the maximum principal amount outstanding at any one time during 2015 was $414 million. There were no net proceeds from the issuance of commercial paper in 2014 and the maximum principal amount outstanding at any one time during 2014 was $175 million.

In September 2014, we issued $400 million of 2.625% senior notes due October 1, 2019, $600 million of 3.85% senior notes due October 1, 2024 and $750 million of 4.95% senior notes due October 1, 2044. Our net proceeds, reduced for the underwriters' discount and commission and offering expenses, were $1.73 billion. We used a portion of the net proceeds to redeem our $500 million 6.45% senior unsecured notes.

The remainder of the cash used in or provided by financing activities in 2015, 2014, and 2013 primarily resulted from proceeds from stock option exercises and the change in book overdraft.

Future Sources and Uses of Liquidity

Dividends

The following table provides details of dividend payments, excluding dividend equivalent rights, in 2013, 2014, and 2015 under our Board approved quarterly cash dividend policy:

Payment Date	Amount per Share	Total Amount
		(in millions)
2013	$1.06	$	167
2014	$1.10	$	170
2015	$1.14	$	170

The Merger discussed in Note 2 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data does not impact our ability and intent to continue quarterly dividend payments prior to the closing of the Merger consistent with our historical dividend payments. Under the terms of the Merger Agreement, we have agreed with Aetna that our quarterly dividend will not exceed $0.29 per share prior to the closing of the Merger. Declaration and payment of future quarterly dividends is at the discretion of our Board and may be adjusted as business needs or market conditions change. In addition, under the terms of the Merger Agreement, we have agreed with Aetna to coordinate the declaration and payment of dividends so that our stockholders do not fail to receive a quarterly dividend around the time of the closing of the Merger.

On October 29, 2015, the Board declared a cash dividend of $0.29 per share that was paid on January 29, 2016 to stockholders of record on December 30, 2015, for an aggregate amount of $43 million.

Stock Repurchases

In September 2014, our Board of Directors replaced a previous share repurchase authorization of up to $1 billion (of which $816 million remained unused) with a new current authorization for repurchases of up to $2 billion of our common shares exclusive of shares repurchased in connection with employee stock plans, expiring on December 31, 2016. Under the share repurchase authorization, shares may be purchased from time to time at prevailing prices in the open market, by block purchases, through plans designed to comply with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended, or in privately-negotiated transactions (including pursuant to accelerated share repurchase agreements with investment banks), subject to certain regulatory restrictions on volume, pricing, and timing. Pursuant to the Merger Agreement, after July 2, 2015, we are prohibited from repurchasing any of our outstanding securities without the prior written consent of Aetna, other than repurchases of shares of our common stock in connection with the exercise of outstanding stock options or the vesting or settlement of outstanding restricted stock awards. Accordingly, as announced on July 3, 2015, we have suspended our share repurchase program. Our remaining repurchase authorization was$1.04 billion as of July 3, 2015.

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Senior Notes

In September 2014, we issued $400 million of 2.625% senior notes due October 1, 2019, $600 million of 3.85% senior notes due October 1, 2024 and $750 million of 4.95% senior notes due October 1, 2044. Our net proceeds, reduced for the underwriters' discount and commission and offering expenses, were $1.73 billion. We used a portion of the net proceeds to redeem the 6.45% senior unsecured notes as discussed below. We previously issued $500 million of 6.45% senior notes due June 1, 2016 that were redeemed in October 2014, $500 million of 7.20% senior notes due June 15, 2018, $300 million of 6.30% senior notes due August 1, 2018, $600 million of 3.15% senior notes due December 1, 2022, $250 million of 8.15% senior notes due June 15, 2038, and $400 million of 4.625% senior notes due December 1, 2042.

In October 2014, we redeemed the $500 million 6.45% senior unsecured notes due June 1, 2016, at 100%of the principal amount plus applicable premium for early redemption and accrued and unpaid interest to the redemption date, for cash totaling approximately $560 million. We recognized a loss on extinguishment of debt of approximately $37 million in October 2014 in connection with the redemption of these notes.

Our senior notes, which are unsecured, may be redeemed at our option at any time at 100% of the principal amount plus accrued interest and a specified make-whole amount. The 7.20% and 8.15% senior notes are subject to an interest rate adjustment if the debt ratings assigned to the notes are downgraded (or subsequently upgraded). In addition, each series of our senior notes (other than the 6.30% senior notes) contain a change of control provision that may require us to purchase the notes under certain circumstances. On July 2, 2015 we entered into a Merger Agreement with Aetna that, when closed, may require redemption of the notes if the notes are downgraded below investment grade by both Standard & Poor’s Rating Services, or S&P and Moody’s Investors Services, Inc., or Moody’s.

Credit Agreement

Our5-year$1.0 billionunsecured revolving credit agreement expires July 2018. Under the credit agreement, at our option, we can borrow on either a competitive advance basis or a revolving credit basis. The revolving credit portion bears interest at either LIBOR plus a spread or the base rate plus a spread. The LIBOR spread, currently110basis points, varies depending on our credit ratings ranging from 90 to 150basis points. We also pay an annual facility fee regardless of utilization. This facility fee, currently15basis points, may fluctuate between10 and 25basis points, depending upon our credit ratings. The competitive advance portion of any borrowings will bear interest at market rates prevailing at the time of borrowing on either a fixed rate or a floating rate based on LIBOR, at our option.

The terms of the credit agreement include standard provisions related to conditions of borrowing, including a customary material adverse effect clause which could limit our ability to borrow additional funds. In addition, the credit agreement contains customary restrictive and financial covenants as well as customary events of default, including financial covenants regarding the maintenance of a minimum level of net worth of $8.5 billionat December 31, 2015and a maximum leverage ratio of 3.0:1. We are in compliance with the financial covenants, with actual net worth of$10.3 billionand an actual leverage ratio of 1.3:1, as measured in accordance with the credit agreement as of December 31,2015. In addition, the credit agreement includes an uncommitted $250 million incremental loan facility.

At December 31, 2015, we had no borrowings outstanding under the credit agreement and we had outstanding letters of credit of $1 million secured under the credit agreement. No amounts have been drawn on these letters of credit. Accordingly, as of December 31, 2015, we had $999 million of remaining borrowing capacity under the credit agreement, none of which would be restricted by our financial covenant compliance requirement. We have other customary, arms-length relationships, including financial advisory and banking, with some parties to the credit agreement.

Commercial Paper

In October 2014, we entered into a commercial paper program pursuant to which we may issue short-term, unsecured commercial paper notes privately placed on a discount basis through certain broker dealers. Amounts available under the program may be borrowed, repaid and re-borrowed from time to time, with the aggregate face or principal amount outstanding under the program at any time not to exceed $1 billion. The net proceeds of issuances have been and are

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expected to be used for general corporate purposes. The maximum principal amount outstanding at any one time during the year endedDecember 31, 2015 was $414 million. There was $299 million outstanding at December 31, 2015.

Liquidity Requirements

We believe our cash balances, investment securities, operating cash flows, and funds available under our credit agreement and our commercial paper program or from other public or private financing sources, taken together, provide adequate resources to fund ongoing operating and regulatory requirements, acquisitions, future expansion opportunities, and capital expenditures for at least the next twelve months, as well as to refinance or repay debt, and repurchase shares.

Adverse changes in our credit rating may increase the rate of interest we pay and may impact the amount of credit available to us in the future. Our investment-grade credit rating at December 31, 2015 was BBB+ according to Standard & Poor’s Rating Services, or S&P, and Baa3 according to Moody’s Investors Services, Inc., or Moody’s. A downgrade by S&P to BB+ or by Moody’s to Ba1 triggers an interest rate increase of 25 basis points with respect to $750 million of our senior notes. Successive one notch downgrades increase the interest rate an additional 25 basis points, or annual interest expense by $2 million, up to a maximum 100 basis points, or annual interest expense by $8 million.

In addition, we operate as a holding company in a highly regulated industry. Humana Inc., our parent company, is dependent upon dividends and administrative expense reimbursements from our subsidiaries, most of which are subject to regulatory restrictions. We continue to maintain significant levels of aggregate excess statutory capital and surplus in our state-regulated operating subsidiaries. Cash, cash equivalents, and short-term investments at the parent company increased to $1.6 billion at December 31, 2015 from $1.4 billion at December 31, 2014. This increase primarily reflects proceeds from the sale of Concentra on June 1, 2015, proceeds from issuance of commercial paper and subsidiary dividends to the parent company, partially offset by funding of subsidiary working capital requirements, common stock repurchases, capital expenditures, and payment of stockholder dividends. Our use of operating cash derived from our non-insurance subsidiaries, such as our Healthcare Services segment, is generally not restricted by Departments of Insurance. Our regulated subsidiaries paid dividends to the parent of $493 million in 2015, $927 million in 2014, and $967 million in 2013. Subsidiary dividends in 2015 reflect the impact of losses for our individual commercial medical business compliant with the Health Care Reform Law and the November 5, 2015 revised statutory accounting guidance requiring the exclusion of risk corridor receivables from related statutory surplus described below. Refer to our parent company financial statements and accompanying notes in Schedule I - Parent Company Financial Information. Excluding Puerto Rico subsidiaries, the amount of ordinary dividends that may be paid to our parent company in2016is approximately$900 million, in the aggregate. Actual dividends paid may vary due to consideration of excess statutory capital and surplus and expected future surplus requirements related to, for example, premium volume and product mix.

On November 5, 2015, the National Association of Insurance Commissioners, or NAIC, issued statutory accounting guidance for receivables associated with the risk corridor provisions under the Health Care Reform Law, which requires the receivables to be excluded from subsidiary surplus. This accounting guidance required additional capital contributions into certain subsidiaries during 2015. This statutory accounting guidance does not affect our financial statements prepared in accordance with generally accepted accounting principles, under which we have recorded a receivable for risk corridor amounts due to us as an obligation of the United States Government under the Health Care Reform Law. At December 31, 2015, our gross risk corridor receivable for the 2014 and 2015 coverage years in the aggregate was $459 million. We expect to record a risk corridor receivable of approximately $340 million in 2016 for the 2016 coverage year.

Certain regulated subsidiaries recognized premium deficiency reserves for our individual commercial medical policies compliant with the Health Care Reform Law for the 2016 coverage year in the fourth quarter of 2015. Further, the statutory-based premium deficiency excludes the estimated benefit associated with the risk corridor provisions as a reduction in subsidiary surplus in accordance with the previously discussed November 5, 2015 statutory accounting guidance requiring the exclusion of risk corridor amounts from subsidiary surplus. As a result of the statutory-based premium deficiency, we will fund capital contributions into certain regulated subsidiaries of $450 million during the first quarter of 2016.

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In 2015, we paid the federal government $867 million for the annual health insurance industry fee and expect to pay a higher amount in 2016 given an increase in market share. The Consolidated Appropriations Act, 2016, enacted on December 18, 2015, included a one-time one year suspension in 2017 of the health insurer fee.

Regulatory Requirements

For a detailed discussion of our regulatory requirements, including aggregate statutory capital and surplus as well as dividends paid from the subsidiaries to the parent, please refer to Note 15 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

Contractual Obligations

We are contractually obligated to make payments for years subsequent to December 31, 2015 as follows:

	Payments Due by Period
	Total		Less than 1 Year		1-3 Years		3-5 Years		More than 5 Years
	(in millions)
Debt	$	4,099	$	299	$	800	$	400	$	2,600
Interest (1)	2,539		188		342		244		1,765
Operating leases (2)	697		173		286		148		90
Purchase obligations (3)	150		74		74		2		—
Future policy benefits payable and other long-term liabilities (4)	2,578		79		462		204		1,833
Total	$	10,063	$	813	$	1,964	$	998	$	6,288

(1) Interest includes the estimated contractual interest payments under our debt agreements.

(2) We lease facilities, computer hardware, and other furniture and equipment under long-term operating leases that are noncancelable and expire on various dates through 2026. We sublease facilities or partial facilities to third party tenants for space not used in our operations which partially mitigates our operating lease commitments. An operating lease is a type of off-balance sheet arrangement. Assuming we acquired the asset, rather than leased such asset, we would have recognized a liability for the financing of these assets. See also Note 16 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

(3) Purchase obligations include agreements to purchase services, primarily information technology related services, or to make improvements to real estate, in each case that are enforceable and legally binding on us and that specify all significant terms, including: fixed or minimum levels of service to be purchased; fixed, minimum or variable price provisions; and the appropriate timing of the transaction. Purchase obligations exclude agreements that are cancelable without penalty.

(4) Includes future policy benefits payable ceded to third parties through 100% coinsurance agreements as more fully described in Note 19 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data. We expect the assuming reinsurance carriers to fund these obligations and reflected these amounts as reinsurance recoverables included in other long-term assets on our consolidated balance sheet. Amounts payable in less than one year are included in trade accounts payable and accrued expenses in the consolidated balance sheet.

Off-Balance Sheet Arrangements

As of December 31, 2015, we were not involved in any special purpose entity, or SPE, transactions. For a detailed discussion off-balance sheet arrangements, please refer to Note 16 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

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Guarantees and Indemnifications

For a detailed discussion our guarantees and indemnifications, please refer to Note 16 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

Government Contracts

For a detailed discussion of our government contracts, including our Medicare, Military, and Medicaid contracts, please refer to Note 16 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

Critical Accounting Policies and Estimates

The discussion and analysis of our financial condition and results of operations is based upon our consolidated financial statements and accompanying notes, which have been prepared in accordance with accounting principles generally accepted in the United States of America. The preparation of these financial statements and accompanying notes requires us to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. We continuously evaluate our estimates and those critical accounting policies primarily related to benefits expense and revenue recognition as well as accounting for impairments related to our investment securities, goodwill, and long-lived assets. These estimates are based on knowledge of current events and anticipated future events and, accordingly, actual results ultimately may differ from those estimates. We believe the following critical accounting policies involve the most significant judgments and estimates used in the preparation of our consolidated financial statements.

Benefits Expense Recognition

Benefits expense is recognized in the period in which services are provided and includes an estimate of the cost of services which have been incurred but not yet reported, or IBNR. IBNR represents a substantial portion of our benefits payable as follows:

	December 31, 2015		Percentage of Total		December 31, 2014		Percentage of Total
	(dollars in millions)
IBNR	$	3,730	75.0	%	$	3,254	72.7	%
Reported claims in process	600		12.1	%	475		10.6	%
Premium deficiency reserve	176		3.5	%	—		—	%
Other benefits payable	470		9.4	%	746		16.7	%
Total benefits payable	$	4,976	100.0	%	$	4,475	100.0	%

Our reserving practice is to consistently recognize the actuarial best point estimate within a level of confidence required by actuarial standards. Actuarial standards of practice generally require a level of confidence such that the liabilities established for IBNR have a greater probability of being adequate versus being insufficient, or such that the liabilities established for IBNR are sufficient to cover obligations under an assumption of moderately adverse conditions. Adverse conditions are situations in which the actual claims are expected to be higher than the otherwise estimated value of such claims at the time of the estimate. Therefore, in many situations, the claim amounts ultimately settled will be less than the estimate that satisfies the actuarial standards of practice.

We develop our estimate for IBNR using actuarial methodologies and assumptions, primarily based upon historical claim experience. Depending on the period for which incurred claims are estimated, we apply a different method in determining our estimate. For periods prior to the most recent two months, the key assumption used in estimating our IBNR is that the completion factor pattern remains consistent over a rolling 12-month period after adjusting for known changes in claim inventory levels and known changes in claim payment processes. Completion factors result from the calculation of the percentage of claims incurred during a given period that have historically been adjudicated as of the reporting period. For the most recent two months, the incurred claims are estimated primarily from a trend analysis

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based upon per member per month claims trends developed from our historical experience in the preceding months, adjusted for known changes in estimates of recent hospital and drug utilization data, provider contracting changes, changes in benefit levels, changes in member cost sharing, changes in medical management processes, product mix, and weekday seasonality.

The completion factor method is used for the months of incurred claims prior to the most recent two months because the historical percentage of claims processed for those months is at a level sufficient to produce a consistently reliable result. Conversely, for the most recent two months of incurred claims, the volume of claims processed historically is not at a level sufficient to produce a reliable result, which therefore requires us to examine historical trend patterns as the primary method of evaluation. Changes in claim processes, including recoveries of overpayments, receipt cycle times, claim inventory levels, outsourcing, system conversions, and processing disruptions due to weather or other events affect views regarding the reasonable choice of completion factors. Claim payments to providers for services rendered are often net of overpayment recoveries for claims paid previously, as contractually allowed. Claim overpayment recoveries can result from many different factors, including retroactive enrollment activity, audits of provider billings, and/or payment errors. Changes in patterns of claim overpayment recoveries can be unpredictable and result in completion factor volatility, as they often impact older dates of service. The receipt cycle time measures the average length of time between when a medical claim was initially incurred and when the claim form was received. Increases in electronic claim submissions from providers decrease the receipt cycle time. If claims are submitted or processed on a faster (slower) pace than prior periods, the actual claim may be more (less) complete than originally estimated using our completion factors, which may result in reserves that are higher (lower) than required.

Medical cost trends potentially are more volatile than other segments of the economy. The drivers of medical cost trends include increases in the utilization of hospital facilities, physician services, new higher priced technologies and medical procedures, and new prescription drugs and therapies, as well as the inflationary effect on the cost per unit of each of these expense components. Other external factors such as government-mandated benefits or other regulatory changes, the tort liability system, increases in medical services capacity, direct to consumer advertising for prescription drugs and medical services, an aging population, lifestyle changes including diet and smoking, catastrophes, and epidemics also may impact medical cost trends. Internal factors such as system conversions, claims processing cycle times, changes in medical management practices and changes in provider contracts also may impact our ability to accurately predict estimates of historical completion factors or medical cost trends. All of these factors are considered in estimating IBNR and in estimating the per member per month claims trend for purposes of determining the reserve for the most recent two months. Additionally, we continually prepare and review follow-up studies to assess the reasonableness of the estimates generated by our process and methods over time. The results of these studies are also considered in determining the reserve for the most recent two months. Each of these factors requires significant judgment by management.

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The completion and claims per member per month trend factors are the most significant factors impacting the IBNR estimate. The portion of IBNR estimated using completion factors for claims incurred prior to the most recent two months is generally less variable than the portion of IBNR estimated using trend factors. The following table illustrates the sensitivity of these factors assuming moderate adverse experience and the estimated potential impact on our operating results caused by reasonably likely changes in these factors based on December 31, 2015 data:

Completion Factor (a):		Claims Trend Factor (b):
Factor Change (c)	Decrease in Benefits Payable	Factor Change (c)	Decrease in Benefits Payable
(dollars in millions)
0.60%	$(181)	(2.75)%	$(298)
0.50%	$(151)	(2.50)%	$(271)
0.40%	$(120)	(2.25)%	$(244)
0.30%	$(90)	(2.00)%	$(217)
0.20%	$(60)	(1.75)%	$(190)
0.10%	$(30)	(1.50)%	$(162)
—%	$—	(1.25)%	$(135)

(a) Reflects estimated potential changes in benefits payable at December 31, 2015 caused by changes in completion factors for incurred months prior to the most recent two months.

(b) Reflects estimated potential changes in benefits payable at December 31, 2015 caused by changes in annualized claims trend used for the estimation of per member per month incurred claims for the most recent two months.

(c) The factor change indicated represents the percentage point change.

The following table provides a historical perspective regarding the accrual and payment of our benefits payable, excluding military services. Components of the total incurred claims for each year include amounts accrued for current year estimated benefits expense as well as adjustments to prior year estimated accruals.

	2015			2014			2013
	(in millions)
Balances at January 1	$	4,475		$	3,893		$	3,775
Less: Reinsurance recoverables	(78		)	—			—
Balances at January 1, net	4,397			3,893			3,775
Acquisitions	—			—			5
Incurred related to:
Current year	44,397			38,641			32,711
Prior years	(236		)	(518		)	(474		)
Total incurred	44,161			38,123			32,237
Paid related to:
Current year	(39,802		)	(34,357		)	(29,103		)
Prior years	(4,041		)	(3,262		)	(3,021		)
Total paid	(43,843		)	(37,619		)	(32,124		)
Premium deficiency reserve	176			—			—
Reinsurance recoverable	85			78			—
Balances at December 31	$	4,976		$	4,475		$	3,893

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The following table summarizes the changes in estimate for incurred claims related to prior years attributable to our key assumptions. As previously described, our key assumptions consist of trend and completion factors estimated using an assumption of moderately adverse conditions. The amounts below represent the difference between our original estimates and the actual benefits expense ultimately incurred as determined from subsequent claim payments.

	Favorable Development by Changes in Key Assumptions
	2015					2014					2013
	Amount			Factor Change (a)		Amount			Factor Change (a)		Amount			Factor Change (a)
	(dollars in millions)
Trend factors	$	(145	)	(1.5	)%	$	(266	)	(3.7	)%	$	(233	)	(3.4	)%
Completion factors	(91		)	0.4	%	(252		)	1.2	%	(241		)	1.2	%
Total	$	(236	)			$	(518	)			$	(474	)

(a) The factor change indicated represents the percentage point change.

As previously discussed, our reserving practice is to consistently recognize the actuarial best estimate of our ultimate liability for claims. Actuarial standards require the use of assumptions based on moderately adverse experience, which generally results in favorable reserve development, or reserves that are considered redundant. We experienced favorable medical claims reserve development related to prior fiscal years of $236 million in 2015, $518 million in 2014, and $474 million in 2013. The table below details our favorable medical claims reserve development related to prior fiscal years by segment for 2015, 2014, and 2013.

	Favorable Medical Claims Reserve Development									Change
	2015			2014			2013			2015		2014
	(in millions)
Retail Segment	$	(228	)	$	(488	)	$	(428	)	$	260	$	(60	)
Group Segment	(7		)	(29		)	(42		)	22		13
Other Businesses	(1		)	(1		)	(4		)	—		3
Total	$	(236	)	$	(518	)	$	(474	)	$	282	$	(44	)

The favorable medical claims reserve development for 2015, 2014, and 2013 primarily reflects the consistent application of trend and completion factors estimated using an assumption of moderately adverse conditions. The decline in favorable prior period development in 2015 primarily was due to the impact of lower financial claim recoveries due in part to our gradual implementation during 2014 of inpatient authorization review prior to admission as opposed to post adjudication, as well as higher than expected flu associated claims from the fourth quarter of 2014 and continued volatility in claims associated with individual commercial medical products. The higher favorable prior period development during 2014 and 2013 resulted from increased membership, better than originally expected utilization across most of our major business lines and increased financial recoveries. The increase in financial recoveries primarily resulted from claim audit process enhancements as well as increased volume of claim audits and expanded audit scope. All lines of business benefited from these improvements.

We continually adjust our historical trend and completion factor experience with our knowledge of recent events that may impact current trends and completion factors when establishing our reserves. Because our reserving practice is to consistently recognize the actuarial best point estimate using an assumption of moderately adverse conditions as required by actuarial standards, there is a reasonable possibility that variances between actual trend and completion factors and those assumed in our December 31, 2015 estimates would fall towards the middle of the ranges previously presented in our sensitivity table.

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Benefits expense excluded from the previous table was as follows for the years ended December 31, 2015, 2014 and 2013:

	2015			2014		2013
	(in millions)
Premium deficiency reserve for short-duration policies	$	176		$	—	$	—
Military services	12			11		(27		)
Future policy benefits	(80		)	32		354
Total	$	108		$	43	$	327

In the fourth quarter of 2015, we recognized a premium deficiency reserve for our individual commercial medical business compliant with the Health Care Reform Law associated with the 2016 coverage year as discussed in more detail in Note 7 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

Military services benefits expense for 2015 and 2014 reflect expenses associated with our contracts with the Veterans Administration. Military services benefits expense for 2013 reflects the beneficial effect of a favorable settlement of contract claims with the DoD partially offset by expenses associated with our contracts with the Veterans Administration.

Certain health policies sold to individuals prior to 2014 (the first year plans compliant with the Health Care Reform Law were effective) are accounted for as long-duration as more fully described below. The reduction in future policy benefits in 2015 reflects the release of reserves as individual commercial medical members transition to plans compliant with the Health Care Reform Law.

Future policy benefits payable of $2.2 billion and $2.3 billion at December 31, 2015 and 2014, respectively, represent liabilities for long-duration insurance policies including long-term care insurance, life insurance, annuities, and certain health and other supplemental policies sold to individuals for which some of the premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. At policy issuance, these reserves are recognized on a net level premium method based on premium rate increase, interest rate, mortality, morbidity, persistency (the percentage of policies remaining in-force), and maintenance expense assumptions. Interest rates are based on our expected net investment returns on the investment portfolio supporting the reserves for these blocks of business. Mortality, a measure of expected death, and morbidity, a measure of health status, assumptions are based on published actuarial tables, modified based upon actual experience. The assumptions used to determine the liability for future policy benefits are established and locked in at the time each contract is issued and only change if our expected future experience deteriorates to the point that the level of the liability, together with the present value of future gross premiums, are not adequate to provide for future expected policy benefits and maintenance costs (i.e. the loss recognition date). Because these policies have long-term claim payout periods, there is a greater risk of significant variability in claims costs, either positive or negative. We perform loss recognition tests at least annually in the fourth quarter, and more frequently if adverse events or changes in circumstances indicate that the level of the liability, together with the present value of future gross premiums, may not be adequate to provide for future expected policy benefits and maintenance costs.

Future policy benefits payable include $1.5 billion at December 31, 2015 and2014associated with a non-strategic closed block of long-term care insurance policies acquired in connection with the 2007 acquisition of KMG. Approximately 31,800 policies remain in force as of December 31, 2015. No new policies have been written since 2005 under this closed block. Future policy benefits payable includes amounts charged to accumulated other comprehensive income for an additional liability that would exist on our closed-block of long-term care insurance policies if unrealized gains on the sale of the investments backing such products had been realized and the proceeds reinvested at then current yields. There was no additional liability at December 31, 2015 and $123 million of additional liability at December 31,2014. Amounts charged to accumulated other comprehensive income are net of applicable deferred taxes.

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Long-term care insurance policies provide nursing home and home health coverage for which premiums are collected many years in advance of benefits paid, if any. Therefore, our actual claims experience will emerge many years after assumptions have been established. The risk of a deviation of the actual interest, morbidity, mortality, and maintenance expense assumptions from those assumed in our reserves are particularly significant to our closed block of long-term care insurance policies. A prolonged period during which interest rates remain at levels lower than those anticipated in our reserving would result in shortfalls in investment income on assets supporting our obligation under long term care policies because the long duration of the policy obligations exceeds the duration of the supporting investment assets. Further, we monitor the loss experience of these long-term care insurance policies and, when necessary, apply for premium rate increases through a regulatory filing and approval process in the jurisdictions in which such products were sold. To the extent premium rate increases, interest rates, and/or loss experience vary from our loss recognition date assumptions, future material adjustments to reserves could be required.

During 2013, we recorded a loss for a premium deficiency. The premium deficiency was based on current and anticipated experience that had deteriorated from our locked-in assumptions from the previous December 31, 2010 loss recognition date, particularly as they related to emerging experience due to an increase in life expectancies and utilization of home health care services. Based on this deterioration, and combined with lower interest rates, we determined that our existing future policy benefits payable, together with the present value of future gross premiums, associated with our closed block of long-term care insurance policies were not adequate to provide for future policy benefits and maintenance costs under these policies; therefore we unlocked and modified our assumptions based on current expectations. Accordingly, during 2013 we recorded $243 million of additional benefits expense, with a corresponding increase in future policy benefits payable of $350 million partially offset by a related reinsurance recoverable of $107 million included in other long-term assets.

For our closed block of long-term care policies, actuarial assumptions used to estimate reserves are inherently uncertain due to the potential changes in trends in mortality, morbidity, persistency and interest rates as well as premium rate increases. As a result, our long term care reserves may be subject to material increases if these trends develop adversely to our expectations. The estimated increase in reserves and additional benefit expense from hypothetically modeling adverse variations in our actuarial assumptions, in the aggregate, could be up to $400 million, net of reinsurance. Although such hypothetical revisions are not currently appropriate, we believe they could occur based on past variances in experience and our expectation of the ranges of future experience that could reasonably occur, and any such revision could be material. Generally accepted accounting principles do not allow us to unlock our assumptions for favorable items.

In addition, future policy benefits payable includes amounts of $205 million at December 31, 2015, $210 million at December 31, 2014, and $215 million at December 31, 2013 which are subject to 100% coinsurance agreements as more fully described in Note 19 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data, and as such are offset by a related reinsurance recoverable included in other long-term assets.

Revenue Recognition

We generally establish one-year commercial membership contracts with employer groups, subject to cancellation by the employer group on 30-day written notice. Our Medicare contracts with CMS renew annually. Our military services contracts with the federal government and our contracts with various state Medicaid programs generally are multi-year contracts subject to annual renewal provisions.

Our commercial contracts establish rates on a per employee basis for each month of coverage based on the type of coverage purchased (single to family coverage options). Our Medicare and Medicaid contracts also establish monthly rates per member. However, our Medicare contracts also have additional provisions as outlined in the following separate section.

Premiums revenue and administrative services only, or ASO, fees are estimated by multiplying the membership covered under the various contracts by the contractual rates. In addition, we adjust revenues for estimated changes in an employer’s enrollment and individuals that ultimately may fail to pay, and for estimated rebates under the minimum benefit ratios required under the Health Care Reform Law. Enrollment changes not yet processed or not yet reported by an employer group or the government, also known as retroactive membership adjustments, are estimated based on

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available data and historical trends. We routinely monitor the collectibility of specific accounts, the aging of receivables, historical retroactivity trends, estimated rebates, as well as prevailing and anticipated economic conditions, and reflect any required adjustments in the current period’s revenue.

We bill and collect premium from employer groups and members in our Medicare and other individual products monthly. We receive monthly premiums from the federal government and various states according to government specified payment rates and various contractual terms. Changes in revenues from for our Medicare and individual commercial medical products resulting from the periodic changes in risk-adjustment scores derived from medical diagnoses for our membership are recognized when the amounts become determinable and the collectibility is reasonably assured.

Medicare Risk-Adjustment Provisions

CMS utilizes a risk-adjustment model which apportions premiums paid to Medicare Advantage plans according to health severity. The risk-adjustment model pays more for enrollees with predictably higher costs. Under the risk-adjustment methodology, all Medicare Advantage plans must collect and submit the necessary diagnosis code information from hospital inpatient, hospital outpatient, and physician providers to CMS within prescribed deadlines. The CMS risk-adjustment model uses this diagnosis data to calculate the risk-adjusted premium payment to Medicare Advantage plans. Rates paid to Medicare Advantage plans are established under an actuarial bid model, including a process that bases our payments on a comparison of our beneficiaries’ risk scores, derived from medical diagnoses, to those enrolled in the government’s Medicare FFS program. We generally rely on providers, including certain providers in our network who are our employees, to code their claim submissions with appropriate diagnoses, which we send to CMS as the basis for our payment received from CMS under the actuarial risk-adjustment model. We also rely on providers to appropriately document all medical data, including the diagnosis data submitted with claims. We estimate risk-adjustment revenues based on medical diagnoses for our membership. The risk-adjustment model is more fully described in Item 1. – Business under the section titled “Individual Medicare.”

Investment Securities

Investment securities totaled $9.1 billion, or 37% of total assets at December 31, 2015, and $9.5 billion, or 41% of total assets at December 31, 2014. Debt securities, detailed below, comprised this entire investment portfolio at December 31, 2015 and 2014. The fair value of debt securities were as follows at December 31, 2015 and 2014:

	December 31, 2015		Percentage of Total		December 31, 2014		Percentage of Total
	(dollars in millions)
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	332	3.6	%	$	374	3.9	%
Mortgage-backed securities	1,891		20.8	%	1,498		15.7	%
Tax-exempt municipal securities	2,668		29.3	%	3,068		32.1	%
Mortgage-backed securities:
Residential	13		0.1	%	17		0.2	%
Commercial	985		10.8	%	843		8.8	%
Asset-backed securities	263		2.9	%	29		0.3	%
Corporate debt securities	2,958		32.5	%	3,718		39.0	%
Total debt securities	$	9,110	100.0	%	$	9,547	100.0	%

Approximately 98% of our debt securities were investment-grade quality, with a weighted average credit rating of AA by S&P at December 31, 2015. Most of the debt securities that were below investment-grade were rated BB, the

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higher end of the below investment-grade rating scale. Our investment policy limits investments in a single issuer and requires diversification among various asset types.

Tax-exempt municipal securities included pre-refunded bonds of $178 million at December 31, 2015 and $199 million at December 31, 2014. These pre-refunded bonds were secured by an escrow fund consisting of U.S. government obligations sufficient to pay off all amounts outstanding at maturity. The ratings of these pre-refunded bonds generally assume the rating of the government obligations at the time the fund is established. Tax-exempt municipal securities that were not pre-refunded were diversified among general obligation bonds of U.S. states and local municipalities as well as special revenue bonds. General obligation bonds, which are backed by the taxing power and full faith of the issuer, accounted for $1.0 billion of these municipals in the portfolio. Special revenue bonds, issued by a municipality to finance a specific public works project such as utilities, water and sewer, transportation, or education, and supported by the revenues of that project, accounted for $1.4 billion of these municipals. Our general obligation bonds are diversified across the U.S. with no individual state exceeding 11%. In addition, certain monoline insurers guarantee the timely repayment of bond principal and interest when a bond issuer defaults and generally provide credit enhancement for bond issues related to our tax-exempt municipal securities. We have no direct exposure to these monoline insurers. We owned $173 million and $484 million at December 31, 2015 and 2014, respectively, of tax-exempt securities guaranteed by monoline insurers. The equivalent weighted average S&P credit rating of these tax-exempt securities without the guarantee from the monoline insurer was AA.

Our direct exposure to subprime mortgage lending is limited to investment in residential mortgage-backed securities and asset-backed securities backed by home equity loans. The fair value of securities backed by Alt-A and subprime loans was $1 million at December 31, 2015 and 2014. There are no collateralized debt obligations or structured investment vehicles in our investment portfolio. The percentage of corporate securities associated with the financial services industry was 25% at December 31, 2015 and 21% at December 31, 2014.

Gross unrealized losses and fair values aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position were as follows at December 31, 2015:

	Less than 12 months					12 months or more					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	(in millions)
December 31, 2015
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	195	$	(1	)	$	14	$	—		$	209	$	(1	)
Mortgage-backed securities	1,484		(20		)	86		(3		)	1,570		(23		)
Tax-exempt municipal securities	843		(3		)	52		(1		)	895		(4		)
Mortgage-backed securities:
Residential	2		—			4		—			6		—
Commercial	626		(13		)	265		(28		)	891		(41		)
Asset-backed securities	258		(2		)	—		—			258		(2		)
Corporate debt securities	918		(45		)	63		(10		)	981		(55		)
Total debt securities	$	4,326	$	(84	)	$	484	$	(42	)	$	4,810	$	(126	)

Under the other-than-temporary impairment model for debt securities held, we recognize an impairment loss in income in an amount equal to the full difference between the amortized cost basis and the fair value when we have the intent to sell the debt security or it is more likely than not we will be required to sell the debt security before recovery of our amortized cost basis. However, if we do not intend to sell the debt security, we evaluate the expected cash flows

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to be received as compared to amortized cost and determine if a credit loss has occurred. In the event of a credit loss, only the amount of the impairment associated with the credit loss is recognized currently in income with the remainder of the loss recognized in other comprehensive income.

When we do not intend to sell a security in an unrealized loss position, potential other-than-temporary impairment is considered using a variety of factors, including the length of time and extent to which the fair value has been less than cost; adverse conditions specifically related to the industry, geographic area or financial condition of the issuer or underlying collateral of a security; payment structure of the security; changes in credit rating of the security by the rating agencies; the volatility of the fair value changes; and changes in fair value of the security after the balance sheet date. For debt securities, we take into account expectations of relevant market and economic data. For example, with respect to mortgage and asset-backed securities, such data includes underlying loan level data and structural features such as seniority and other forms of credit enhancements. A decline in fair value is considered other-than-temporary when we do not expect to recover the entire amortized cost basis of the security. We estimate the amount of the credit loss component of a debt security as the difference between the amortized cost and the present value of the expected cash flows of the security. The present value is determined using the best estimate of future cash flows discounted at the implicit interest rate at the date of purchase. The risks inherent in assessing the impairment of an investment include the risk that market factors may differ from our expectations, facts and circumstances factored into our assessment may change with the passage of time, or we may decide to subsequently sell the investment. The determination of whether a decline in the value of an investment is other than temporary requires us to exercise significant diligence and judgment. The discovery of new information and the passage of time can significantly change these judgments. The status of the general economic environment and significant changes in the national securities markets influence the determination of fair value and the assessment of investment impairment. There is a continuing risk that declines in fair value may occur and additional material realized losses from sales or other-than-temporary impairments may be recorded in future periods.

The recoverability of our non-agency residential and commercial mortgage-backed securities is supported by factors such as seniority, underlying collateral characteristics and credit enhancements. These residential and commercial mortgage-backed securities at December 31, 2015 primarily were composed of senior tranches having high credit support, with over 99% of the collateral consisting of prime loans. The weighted average credit rating of all commercial mortgage-backed securities was AA+ at December 31, 2015.

All issuers of securities we own that were trading at an unrealized loss at December 31, 2015 remain current on all contractual payments. After taking into account these and other factors previously described, we believe these unrealized losses primarily were caused by an increase in market interest rates in the current markets than when the securities were purchased. At December 31, 2015, we did not intend to sell the securities with an unrealized loss position in accumulated other comprehensive income, and it is not likely that we will be required to sell these securities before recovery of their amortized cost basis. As a result, we believe that the securities with an unrealized loss were not other-than-temporarily impaired at December 31, 2015. There were no material other-than-temporary impairments in 2015, 2014, or 2013.

Goodwill and Long-lived Assets

At December 31, 2015, goodwill and other long-lived assets represented 20% of total assets and 48% of total stockholders’ equity, compared to 24% and 59%, respectively, at December 31, 2014.

We are required to test at least annually for impairment at a level of reporting referred to as the reporting unit, and more frequently if adverse events or changes in circumstances indicate that the asset may be impaired. A reporting unit either is our operating segments or one level below the operating segments, referred to as a component, which comprise our reportable segments. A component is considered a reporting unit if the component constitutes a business for which discrete financial information is available that is regularly reviewed by management. We are required to aggregate the components of an operating segment into one reporting unit if they have similar economic characteristics. Goodwill is assigned to the reporting unit that is expected to benefit from a specific acquisition. The carrying amount of goodwill for our reportable segments has been retrospectively adjusted to conform to the 2015 segment change discussed in Note 2 to the consolidated financial statements included in Item 8. – Financial Statements and Supplementary Data.

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We use a two-step process to review goodwill for impairment. The first step is a screen for potential impairment, and the second step measures the amount of impairment, if any. Our strategy, long-range business plan, and annual planning process support our goodwill impairment tests. These tests are performed, at a minimum, annually in the fourth quarter, and are based on an evaluation of future discounted cash flows. We rely on this discounted cash flow analysis to determine fair value. However outcomes from the discounted cash flow analysis are compared to other market approach valuation methodologies for reasonableness. We use discount rates that correspond to a market-based weighted-average cost of capital and terminal growth rates that correspond to long-term growth prospects, consistent with the long-term inflation rate. Key assumptions in our cash flow projections, including changes in membership, premium yields, medical and operating cost trends, and certain government contract extensions, are consistent with those utilized in our long-range business plan and annual planning process. If these assumptions differ from actual, including the impact of the Health Care Reform Law, the estimates underlying our goodwill impairment tests could be adversely affected. Goodwill impairment tests completed in each of the last three years did not result in an impairment loss. The fair value of our reporting units with significant goodwill exceeded carrying amounts by a substantial margin. A 100 basis point increase in the discount rate would not have a significant impact on the amount of margin for any of our reporting units with significant goodwill, with the exception of our provider services reporting unit in our Healthcare Services segment. The provider services reporting unit would decline to approximately 10% margin after factoring in a 100 basis point increase in the discount rate.

Long-lived assets consist of property and equipment and other finite-lived intangible assets. These assets are depreciated or amortized over their estimated useful life, and are subject to impairment reviews. We periodically review long-lived assets whenever adverse events or changes in circumstances indicate the carrying value of the asset may not be recoverable. In assessing recoverability, we must make assumptions regarding estimated future cash flows and other factors to determine if an impairment loss may exist, and, if so, estimate fair value. We also must estimate and make assumptions regarding the useful life we assign to our long-lived assets. If these estimates or their related assumptions change in the future, we may be required to record impairment losses or change the useful life, including accelerating depreciation or amortization for these assets. There were no material impairment losses in the last three years.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Our earnings and financial position are exposed to financial market risk, including those resulting from changes in interest rates.

The level of our pretax earnings is subject to market risk due to changes in interest rates and the resulting impact on investment income and interest expense. Prior to 2009, under interest rate swap agreements, we exchanged the fixed interest rate under all of our senior notes for a variable interest rate based on LIBOR using interest rate swap agreements. We terminated all of our interest rate swap agreements in 2008. We may re-enter into interest rate swap agreements in the future depending on market conditions and other factors. Amounts borrowed under the revolving credit portion of our $1.0 billion unsecured revolving credit agreement bear interest at either LIBOR plus a spread or the base rate plus a spread. There were no borrowings outstanding under our credit agreement at December 31, 2015 or December 31, 2014.

Interest rate risk also represents a market risk factor affecting our consolidated financial position due to our significant investment portfolio, consisting primarily of fixed maturity securities of investment-grade quality with a weighted average S&P credit rating of AA at December 31, 2015. Our net unrealized position decreased$383 million from a net unrealized gain position of $475 million at December 31, 2014 to a net unrealized gain position of $92 million at December 31, 2015. At December 31, 2015, we had gross unrealized losses of $126 million on our investment portfolio primarily due to an increase in market interest rates since the time the securities were purchased. There were no material other-than-temporary impairments during 2015. While we believe that these impairments are temporary and we currently do not have the intent to sell such securities, given the current market conditions and the significant judgments involved, there is a continuing risk that future declines in fair value may occur and material realized losses from sales or other-than-temporary impairments may be recorded in future periods.

Duration is the time-weighted average of the present value of the bond portfolio’s cash flow. Duration is indicative of the relationship between changes in fair value and changes in interest rates, providing a general indication of the

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sensitivity of the fair values of our fixed maturity securities to changes in interest rates. However, actual fair values may differ significantly from estimates based on duration. The average duration of our investment portfolio, including cash and cash equivalents, was approximately 4.1 years as of December 31, 2015 and 4.1 years as of December 31, 2014. Based on the duration including cash equivalents, a 1% increase in interest rates would generally decrease the fair value of our securities by approximately $459 million.

We have also evaluated the impact on our investment income and interest expense resulting from a hypothetical change in interest rates of 100, 200, and 300 basis points over the next twelve-month period, as reflected in the following table. The evaluation was based on our investment portfolio and our outstanding indebtedness at December 31, 2015 and 2014. Our investment portfolio consists of cash, cash equivalents, and investment securities. The modeling technique used to calculate the pro forma net change in pretax earnings considered the cash flows related to fixed income investments and debt, which are subject to interest rate changes during a prospective twelve-month period. This evaluation measures parallel shifts in interest rates and may not account for certain unpredictable events that may affect interest income, including unexpected changes of cash flows into and out of the portfolio, changes in the asset allocation, including shifts between taxable and tax-exempt securities, and spread changes specific to various investment categories. In the past ten years, changes in 3 month LIBOR rates during the year have exceeded 300 basis points once, have not changed between 200 and 300 basis points, have changed between 100 and 200 basis points two times, and have changed by less than 100 basis points seven times.

	Increase (decrease) in pretax earnings given an interest rate decrease of X basis points									Increase (decrease) in pretax earnings given an interest rate increase of X basis points
	(300)			(200)			(100)			100			200			300
	(in millions)
As of December 31, 2015
Investment income (a)	$	(33	)	$	(27	)	$	(21	)	$	41		$	82		$	124
Interest expense (b)	3			3			3			(3		)	(6		)	(9		)
Pretax	$	(30	)	$	(24	)	$	(18	)	$	38		$	76		$	115
As of December 31, 2014
Investment income (a)	$	(20	)	$	(15	)	$	(9	)	$	42		$	85		$	128
Interest expense (b)	—			—			—			—			—			—
Pretax	$	(20	)	$	(15	)	$	(9	)	$	42		$	85		$	128

(a) As of December 31, 2015 and 2014, some of our investments had interest rates below 3% so the assumed hypothetical change in pretax earnings does not reflect the full 3% point reduction.

(b) The interest rate under our senior notes is fixed. There were no borrowings outstanding under the credit agreement at December 31, 2015 or December 31, 2014. There was $299 million outstanding under our commercial paper program at December 31, 2015. As of December 31, 2015, our interest rate under our commercial paper program was less than 1% so the assumed hypothetical change in pretax earnings does not reflect the full 1% point reduction. There were no borrowings outstanding under our commercial paper program at December 31, 2014.

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ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Humana Inc.

CONSOLIDATED BALANCE SHEETS

	December 31,
	2015			2014
	(in millions, except share amounts)
ASSETS
Current assets:
Cash and cash equivalents	$	2,571		$	1,935
Investment securities	7,267			7,598
Receivables, less allowance for doubtful accounts of $101 in 2015 and $98 in 2014	1,161			1,053
Other current assets	4,712			4,007
Assets held-for-sale	—			943
Total current assets	15,711			15,536
Property and equipment, net	1,384			1,228
Long-term investment securities	1,843			1,949
Goodwill	3,265			3,231
Other long-term assets	2,502			1,583
Total assets	$	24,705		$	23,527
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Benefits payable	$	4,976		$	4,475
Trade accounts payable and accrued expenses	2,212			2,095
Book overdraft	301			334
Unearned revenues	364			361
Short-term borrowings	299			—
Liabilities held-for-sale	—			206
Total current liabilities	8,152			7,471
Long-term debt	3,821			3,825
Future policy benefits payable	2,151			2,349
Other long-term liabilities	235			236
Total liabilities	14,359			13,881
Commitments and contingencies (Note 16)
Stockholders’ equity:
Preferred stock, $1 par; 10,000,000 shares authorized; none issued	—			—
Common stock, $0.16 2/3 par; 300,000,000 shares authorized; 198,372,059 shares issued at December 31, 2015 and 197,951,551 shares issued at December 31, 2014	33			33
Capital in excess of par value	2,530			2,330
Retained earnings	11,017			9,916
Accumulated other comprehensive income	58			223
Treasury stock, at cost, 50,084,043 shares at December 31, 2015 and 48,347,541 shares at December 31, 2014	(3,292		)	(2,856		)
Total stockholders’ equity	10,346			9,646
Total liabilities and stockholders’ equity	$	24,705		$	23,527

The accompanying notes are an integral part of the consolidated financial statements.

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Humana Inc.

CONSOLIDATED STATEMENTS OF INCOME

	For the year ended December 31,
	2015		2014		2013
	(in millions, except per share results)
Revenues:
Premiums	$	52,409	$	45,959	$	38,829
Services	1,406		2,164		2,109
Investment income	474		377		375
Total revenues	54,289		48,500		41,313
Operating expenses:
Benefits	44,269		38,166		32,564
Operating costs	7,318		7,639		6,355
Depreciation and amortization	355		333		333
Total operating expenses	51,942		46,138		39,252
Income from operations	2,347		2,362		2,061
Gain on sale of business	270		—		—
Interest expense	186		192		140
Income before income taxes	2,431		2,170		1,921
Provision for income taxes	1,155		1,023		690
Net income	$	1,276	$	1,147	$	1,231
Basic earnings per common share	$	8.54	$	7.44	$	7.81
Diluted earnings per common share	$	8.44	$	7.36	$	7.73
Dividends declared per common share	$	1.15	$	1.11	$	1.07

The accompanying notes are an integral part of the consolidated financial statements.

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Humana Inc.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	For the year ended December 31,
	2015			2014			2013
	(in millions)
Net income	$	1,276		$	1,147		$	1,231
Other comprehensive (loss) income:
Change in gross unrealized investment gains/losses	(114		)	122			(338		)
Effect of income taxes	42			(44		)	124
Total change in unrealized investment gains/losses, net of tax	(72		)	78			(214		)
Reclassification adjustment for net realized gains included in investment income	(146		)	(20		)	(22		)
Effect of income taxes	53			7			8
Total reclassification adjustment, net of tax	(93		)	(13		)	(14		)
Other comprehensive (loss) income, net of tax	(165		)	65			(228		)
Comprehensive income	$	1,111		$	1,212		$	1,003

The accompanying notes are an integral part of the consolidated financial statements.

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Humana Inc.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

	Common Stock			Capital In Excess of Par Value			Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Treasury Stock			Total Stockholders’ Equity
	Issued Shares	Amount
	(dollars in millions, share amounts in thousands)
Balances, January 1, 2013	194,471	$	32	$	2,101		$	7,881		$	386		$	(1,553	)	$	8,847
Net income							1,231									1,231
Other comprehensive income										(228		)				(228		)
Common stock repurchases													(531		)	(531		)
Dividends and dividend equivalents				—			(170		)							(170		)
Stock-based compensation				92												92
Restricted stock unit vesting	563	—														—
Stock option exercises	1,242	1		66												67
Stock option and restricted stock tax benefit				8												8
Balances, December 31, 2013	196,276	33		2,267			8,942			158			(2,084		)	9,316
Net income							1,147									1,147
Other comprehensive loss										65						65
Common stock repurchases				(100		)							(772		)	(872		)
Dividends and dividend equivalents				—			(173		)							(173		)
Stock-based compensation				98												98
Restricted stock unit vesting	966	—														—
Stock option exercises	710	—		52												52
Stock option and restricted stock tax benefit				13												13
Balances, December 31, 2014	197,952	33		2,330			9,916			223			(2,856		)	9,646
Net income							1,276									1,276
Other comprehensive income										(165		)				(165		)
Common stock repurchases				100									(485		)	(385		)
Dividends and dividend equivalents				—			(175		)							(175		)
Stock-based compensation				109												109
Restricted stock unit vesting	159	—		(49		)							49			—
Stock option exercises	261	—		23												23
Stock option and restricted stock tax benefit				17												17
Balances, December 31, 2015	198,372	$	33	$	2,530		$	11,017		$	58		$	(3,292	)	$	10,346

The accompanying notes are an integral part of the consolidated financial statements.

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Humana Inc.

CONSOLIDATED STATEMENTS OF CASH FLOWS

	For the year ended December 31,
	2015			2014			2013
	(in millions)
Cash flows from operating activities
Net income	$	1,276		$	1,147		$	1,231
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of business	(270		)	—			—
Depreciation	354			328			309
Amortization	93			121			117
Stock-based compensation	109			98			92
Net realized capital gains	(146		)	(20		)	(22		)
(Benefit) provision for deferred income taxes	(2		)	(64		)	42
Provision for doubtful accounts	61			32			37
Changes in operating assets and liabilities, net of effect of businesses acquired and dispositions:
Receivables	(180		)	(264		)	(251		)
Other assets	(872		)	(952		)	(330		)
Benefits payable	501			582			109
Other liabilities	(129		)	413			313
Unearned revenues	3			155			(24		)
Other	70			42			93
Net cash provided by operating activities	868			1,618			1,716
Cash flows from investing activities
Acquisitions, net of cash acquired	(38		)	(18		)	(187		)
Proceeds from sale of business	1,061			72			34
Purchases of property and equipment	(523		)	(528		)	(441		)
Proceeds from sales of property and equipment	1			—			4
Purchases of investment securities	(6,739		)	(2,883		)	(3,261		)
Maturities of investment securities	1,065			885			1,077
Proceeds from sales of investment securities	5,493			2,409			1,592
Net cash provided by (used in) investing activities	320			(63		)	(1,182		)
Cash flows from financing activities
Receipts (withdrawals) from contract deposits, net	(296		)	(919		)	(150		)
Proceeds from issuance of senior notes, net	—			1,733			—
Proceeds from issuance of commercial paper, net	298			—			—
Repayment of long-term debt	—			(500		)	—
Common stock repurchases	(385		)	(872		)	(531		)
Dividends paid	(172		)	(172		)	(168		)
Excess tax benefit from stock-based compensation	15			12			8
Change in book overdraft	(33		)	(69		)	79
Proceeds from stock option exercises and other, net	21			29			60
Net cash used in financing activities	(552		)	(758		)	(702		)
Increase (decrease) in cash and cash equivalents	636			797			(168		)
Cash and cash equivalents at beginning of year	1,935			1,138			1,306
Cash and cash equivalents at end of year	$	2,571		$	1,935		$	1,138
Supplemental cash flow disclosures:
Interest payments	$	187		$	143		$	146
Income tax payments, net	$	1,179		$	1,030		$	734
Details of businesses acquired in purchase transactions:
Fair value of assets acquired, net of cash acquired	$	38		$	18		$	196
Less: Fair value of liabilities assumed	—			—			(9		)
Cash paid for acquired businesses, net of cash acquired	$	38		$	18		$	187

The accompanying notes are an integral part of the consolidated financial statements.

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Humana Inc.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. REPORTING ENTITY

Nature of Operations

Humana Inc., headquartered in Louisville, Kentucky, is a leading health and well-being company focused on making it easy for people to achieve their best health with clinical excellence through coordinated care. Our strategy integrates care delivery, the member experience, and clinical and consumer insights to encourage engagement, behavior change, proactive clinical outreach and wellness for the millions of people we serve across the country. References throughout these notes to consolidated financial statements to “we,” “us,” “our,” “Company,” and “Humana,” mean Humana Inc. and its subsidiaries. We derived approximately 73% of our total premiums and services revenue from contracts with the federal government in 2015, including 14% related to our federal government contracts with the Centers for Medicare and Medicaid Services, or CMS, to provide health insurance coverage for individual Medicare Advantage members in Florida. CMS is the federal government’s agency responsible for administering the Medicare program.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

Our financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of America. Our consolidated financial statements include the accounts of Humana Inc. and subsidiaries that the Company controls, including variable interest entities associated with medical practices for which we are the primary beneficiary. We do not own many of our medical practices but instead enter into exclusive management agreements with the affiliated Professional Associations, or P.A.s, that operate these medical practices. Based upon the provisions of these agreements, these affiliated P.A.s are variable interest entities and we are the primary beneficiary, and accordingly we consolidated the affiliated P.A.s. All significant intercompany balances and transactions have been eliminated.

The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America requires us to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. The areas involving the most significant use of estimates are the estimation of benefits payable, future policy benefits payable, the impact of risk adjustment provisions related to our Medicare contracts, the valuation and related impairment recognition of investmentsecurities, and the valuation and related impairment recognition of long-lived assets, including goodwill. These estimates are based on knowledge of current events and anticipated future events, and accordingly, actual results may ultimately differ materially from those estimates.

Certain amounts have been reclassified to conform to the current year presentation, including business segment reclassifications discussed below and the reclassification of Concentra Inc. assets and liabilities as held-for-sale in our December 31, 2014 balance sheet for comparative purposes. Refer to Note 3 for a discussion of the sale of Concentra in June 2015.

Aetna Merger

On July 2, 2015, we entered into an Agreement and Plan of Merger, which we refer to in this report as the Merger Agreement, with Aetna Inc. and certain wholly owned subsidiaries of Aetna Inc., which we refer to collectively as Aetna, which sets forth the terms and conditions under which we will merge with, and become a wholly owned subsidiary of Aetna, a transaction we refer to in this report as the Merger. Under the terms of the Merger Agreement, at the closing of the Merger, each outstanding share of our common stock will be converted into the right to receive (i) 0.8375 of a share of Aetna common stock and (ii) $125 in cash. The total transaction was estimated at approximately $37 billion including the assumption of Humana debt, based on the closing price of Aetna common shares on July 2, 2015. The Merger Agreement includes customary restrictions on the conduct of our business prior to the completion of the Merger, generally requiring us to conduct our business in the ordinary course and subjecting us to a variety of customary specified limitations absent Aetna’s prior written consent, including, for example, limitations on dividends (we agreed that our

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Humana Inc.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

quarterly dividend will not exceed $0.29 per share) and repurchases of our securities (we agreed to suspend our share repurchase program), restrictions on our ability to enter into material contracts, and negotiated thresholds for capital expenditures, capital contributions, acquisitions and divestitures of businesses.

On October 19, 2015, our stockholders approved the adoption of the Merger Agreement at a special stockholder meeting.Also on October 19, 2015, the holders of Aetna outstanding shares approved the issuance of Aetna common stock in the Merger at a special meeting of Aetna shareholders.

The Merger is subject to customary closing conditions, including, among other things, (i) the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the receipt of necessary approvals under state insurance and healthcare laws and regulations and pursuant to certain licenses of certain of Humana’s subsidiaries, (ii) the absence of legal restraints and prohibitions on the consummation of the Merger, (iii) listing of the Aetna common stock to be issued in the Merger on the New York Stock Exchange, (iv) subject to the relevant standards set forth in the Merger Agreement, the accuracy of the representations and warranties made by each party, (v) material compliance by each party with its covenants in the Merger Agreement, and (vi) no “Company Material Adverse Effect” with respect to us and no “Parent Material Adverse Effect” with respect to Aetna, in each case since the execution of and as defined in the Merger Agreement. In addition, Aetna’s obligation to consummate the Merger is subject to (a) the condition that the required regulatory approvals do not impose any condition that, individually or in the aggregate, would reasonably be expected to have a “Regulatory Material Adverse Effect” (as such term is defined in the Merger Agreement), and (b) CMS has not imposed any sanctions with respect to our Medicare Advantage, or MA, business that, individually or in the aggregate, is or would reasonably be expected to be material and adverse to us and our subsidiaries, taken as a whole. The Merger is currently expected to close in the second half of 2016.

Business Segment Reclassifications

On January 1, 2015, we realigned certain of our businesses among our reportable segments to correspond with internal management reporting changes and renamed our Employer Group segment to the Group segment. Our three reportable segments remain Retail, Group, and Healthcare Services. The more significant realignments included reclassifying Medicare benefits offered to groups to the Retail segment from the Group segment, bringing all of our Medicare offerings, which are now managed collectively, together in one segment, recognizing that in some instances we market directly to individuals that are part of a group Medicare account. In addition, we realigned our military services business, primarily consisting of our TRICARE South Region contract previously included in the Other Businesses category, to our Group segment as we consider this contract with the government to be a group account. Prior period segment financial information has been recast to conform to the 2015 presentation. See Note 17 for segment financial information and Note 9 for goodwill information by segment.

Health Care Reform

The Patient Protection and Affordable Care Act and The Health Care and Education Reconciliation Act of 2010 (which we collectively refer to as the Health Care Reform Law) enacted significant reforms to various aspects of the U.S. health insurance industry. Certain of these reforms became effective January 1, 2014, including an annual insurance industry premium-based fee and the establishment of federally-facilitated or state-based exchanges coupled with three premium stabilization programs, as described more fully below.

The Health Care Reform Law imposes an annual premium-based fee on health insurers for each calendar year beginning on or after January 1, 2014 which is not deductible for tax purposes. We are required to estimate a liability for the health insurer fee and record it in full once qualifying insurance coverage is provided in the applicable calendar year in which the fee is payable with a corresponding deferred cost that is amortized ratably to expense over the same calendar year. We record the liability for the health insurer fee in trade accounts payable and accrued expenses and record the deferred cost in other current assets in our consolidated financial statements. We pay the health insurer fee in September of each year. The Consolidated Appropriations Act, 2016, enacted on December 18, 2015, included a one-time one year suspension in 2017 of the health insurer fee. See Note 7 for detail regarding amounts paid for the annual health insurer fee.

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Humana Inc.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

The Health Care Reform Law also establishes risk spreading premium stabilization programs effective January 1, 2014. The risk spreading programs are applicable to certain of our commercial medical insurance products. In the aggregate, our commercial medical insurance products represented approximately 18% of our total premiums and services revenue for the year ended December 31, 2015, a subset of which is subject to these programs. These programs, commonly referred to as the 3Rs, include a permanent risk adjustment program, a transitional reinsurance program, and a temporary risk corridors program designed to more evenly spread the financial risk borne by issuers and to mitigate the risk that issuers would have mispriced products. The transitional reinsurance and temporary risk corridors programs are for years 2014 through 2016, with potential for additional reinsurance recoveries through 2018 to the extent funds are available. Policies issued prior to March 23, 2010 are considered grandfathered policies and are exempt from the 3Rs. Certain states have allowed non-grandfathered policies issued prior to January 1, 2014 to extend the date of required transition to policies compliant with the Health Care Reform Law to as late as 2017. Accordingly, such policies are exempt from the 3Rs until they transition to policies compliant with the Health Care Reform Law.

The permanent risk adjustment program adjusts the premiums that commercial individual and small group health insurance issuers receive based on the demographic factors and health status of each member as derived from current year medical diagnosis as reported throughout the year. This program transfers funds from lower risk plans to higher risk plans within similar plans in the same state. The risk adjustment program is applicable to commercial individual and small group health plans (except certain exempt and grandfathered plans as discussed above) operating both inside and outside of the health insurance exchanges established under the Health Care Reform Law. Under the risk adjustment program, a risk score is assigned to each covered member to determine an average risk score at the individual and small group level by legal entity in a particular market in a state. Additionally, an average risk score is determined for the entire subject population for each market in each state. Settlements are determined on a net basis by legal entity and state. Each health insurance issuer’s average risk score is compared to the state’s average risk score. Plans with an average risk score below the state average will pay into a pool and health insurance issuers with an average risk score that is greater than the state average risk score will receive money from that pool. We generally rely on providers, including certain network providers who are our employees, to appropriately document all medical data, including the diagnosis codes submitted with claims, as the basis for our risk scores under the program. Our estimate of amounts receivable and/or payable under the risk adjustment program is based on our estimate of both our own and the state average risk scores. Assumptions used in these estimates include but are not limited to published third party studies and other publicly available data including regulatory plan filings, geographic considerations including our historical experience in markets we have participated in over a long period of time, member demographics (including age and gender for our members and other health insurance issuers), our pricing model, sales data for each metal tier (different metal tiers yield different risk scores), and the mix of previously underwritten membership as compared to new members in plans compliant with the Health Care Reform Law. We refine our estimates as new information becomes available, including additional data released by the Department of Health and Human Services, or HHS, regarding estimates of state average risk scores. Risk adjustment is subject to audit by HHS beginning with the 2015 coverage year, however, there will be no payments associated with these audits for 2015, the pilot year for the audits.

The temporary risk corridor program applies to individual and small group Qualified Health Plans (or substantially equivalent plans), or QHPs, as defined by HHS, operating both inside and outside of the exchanges. Accordingly, plans subject to risk adjustment that are not QHPs, including our small group health plans, were not subject to the risk corridor program in 2014 or 2015. The risk corridor provisions limit issuer gains and losses by comparing allowable medical costs to a target amount, each defined/prescribed by HHS, and sharing the risk for allowable costs with the federal government. Allowable medical costs are adjusted for risk adjustment settlements, transitional reinsurance recoveries, and cost sharing reductions received from HHS. Variances from the target exceeding certain thresholds may result in HHS making additional payments to us or require us to refund HHS a portion of the premiums we received.

We estimate and recognize adjustments to premiums revenue for the risk adjustment and risk corridor provisions by projecting our ultimate premium for the calendar year separately for individual and group plans by state and legal entity. Estimated calendar year settlement amounts are recognized ratably during the year and are revised each period to reflect current experience, including changes in risk scores derived from medical diagnoses submitted by providers. We record receivables or payables at the individual or group level within each state and legal entity and classify the amounts as current or long-term in our consolidated balance sheets based on the timing of expected settlement.

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The transitional reinsurance program requires us to make reinsurance contributions for calendar years 2014 through 2016 to a state or HHS established reinsurance entity based on a national contribution rate per covered member as determined by HHS. While all commercial medical plans, including self-funded plans, are required to fund the reinsurance entity, only fully-insured non-grandfathered plans compliant with the Health Care Reform Law in the individual commercial market will be eligible for recoveries if individual claims exceed a specified threshold. Accordingly, we account for transitional reinsurance contributions associated with all commercial medical health plans other than these non-grandfathered individual plans as an assessment in operating costs in our consolidated statements of income. We account for contributions made by individual commercial plans compliant with the Health Care Reform Law, which are subject to recoveries, as ceded premiums (a reduction of premiums) and similarly we account for any recoveries as ceded benefits (a reduction of benefits expense) in our consolidated statements of income.

We are required to remit payment for our per member reinsurance contribution, exclusive of the portion payable to the U.S. Treasury, by January 15 of the year following the coverage year, or January 15, 2016 for the 2015 coverage year. The portion of the reinsurance contribution due to the U.S. Treasury must be paid by November 15 of the year following the coverage year, or November 15, 2016 for the 2015 coverage year. Risk adjustment calculations will be completed and HHS will notify us of recoveries due or payments owed to/from us under the risk adjustment and reinsurance programs by June 30 of the year following the coverage year. Following this notification, risk corridor calculations are then due by July 31 of the year following the coverage year. Payments due to HHS under the risk adjustment and risk corridor programs must be remitted within 30 days of notification for each program and will be collected prior to the distribution of recoveries by HHS under each program. Payment and recovery amounts associated with reinsurance and risk adjustment will generally be settled with HHS annually in the year following the coverage year. Accordingly, for the 2015 coverage year, we expect to receive recoveries and/or pay amounts due under these programs in 2016. The risk corridor program is a three year program. We are required to pay gross risk corridor payables in the second half of the year following the coverage year. Interim settlements of risk corridor receivables in the year following the coverage year are limited to risk corridor amounts collected by HHS and available for distribution in the year following the coverage year. HHS guidance provides that risk corridor collections over the life of the three year program will first be applied to any shortfalls from previous coverage years before application to current year obligations.Risk corridor payables to issuers are obligations of the United States Government under the Health Care Reform law which requires the Secretary of HHS to make full payments to issuers. In the event of a shortfall at the end of the three year program, HHS has asserted it will explore other sources of funding for risk corridor payments, subject to the availability of appropriations.

See Note 7 for detail regarding amounts recorded to the consolidated balance sheets related to the 3Rs.

In addition to the provisions discussed above, beginning in 2014, HHS pays us a portion of the health care costs for low-income individual members for which we assume no risk in accordance with the Health Care Reform Law. We account for these subsidies as a deposit in our consolidated balance sheets and as a financing activity in our consolidated statements of cash flows. We do not recognize premiums revenue or benefits expense for these subsidies. Receipt and payment activity is accumulated at the state and legal entity level and recorded in our consolidated balance sheet in other current assets or trade accounts payable and accrued expenses depending on the state and legal entity balance at the end of the reporting period. We will be notified of final settlement amounts by June 30 of the year following the coverage year. Receipts from HHS associated with cost sharing subsidies for which we do not assume risk were approximately $478 million, exceeding payments of $409 million by $69 million for the year ended December 31, 2015. For the year ended December 31, 2014, receipts from HHS associated with cost sharing subsidies for which we do not assume risk were approximately $281 million, exceeding payments of $255 million by $26 million. The program began in 2014, and as such, there were no receipts or payments from HHS for cost sharing subsidies in 2013.

Cash and Cash Equivalents

Cash and cash equivalents include cash, time deposits, money market funds, commercial paper, other money market instruments, and certain U.S. Government securities with an original maturity of three months or less. Carrying value approximates fair value due to the short-term maturity of the investments.

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Investment Securities

Investment securities, which consist entirely of debt securities, have been categorized as available for sale and, as a result, are stated at fair value. Investment securities available for current operations are classified as current assets. Investment securities available for our long-term insurance products and professional liability funding requirements, as well as restricted statutory deposits, are classified as long-term assets. For the purpose of determining gross realized gains and losses, which are included as a component of investment income in the consolidated statements of income, the cost of investment securities sold is based upon specific identification. Unrealized holding gains and losses, net of applicable deferred taxes, are included as a component of stockholders’ equity and comprehensive income until realized from a sale or other-than-temporary impairment.

Under the other-than-temporary impairment model for debt securities held, we recognize an impairment loss in income in an amount equal to the full difference between the amortized cost basis and the fair value when we have the intent to sell the debt security or it is more likely than not we will be required to sell the debt security before recovery of our amortized cost basis. However, if we do not intend to sell the debt security, we evaluate the expected cash flows to be received as compared to amortized cost and determine if a credit loss has occurred. In the event of a credit loss, only the amount of the impairment associated with the credit loss is recognized currently in income with the remainder of the loss recognized in other comprehensive income.

When we do not intend to sell a security in an unrealized loss position, potential other-than-temporary impairment is considered using a variety of factors, including the length of time and extent to which the fair value has been less than cost; adverse conditions specifically related to the industry, geographic area or financial condition of the issuer or underlying collateral of a security; payment structure of the security; changes in credit rating of the security by the rating agencies; the volatility of the fair value changes; and changes in fair value of the security after the balance sheet date. For debt securities, we take into account expectations of relevant market and economic data. For example, with respect to mortgage and asset-backed securities, such data includes underlying loan level data and structural features such as seniority and other forms of credit enhancements. A decline in fair value is considered other-than-temporary when we do not expect to recover the entire amortized cost basis of the security. We estimate the amount of the credit loss component of a debt security as the difference between the amortized cost and the present value of the expected cash flows of the security. The present value is determined using the best estimate of future cash flows discounted at the implicit interest rate at the date of purchase.

Receivables and Revenue Recognition

We generally establish one-year commercial membership contracts with employer groups, subject to cancellation by the employer group on 30-day written notice. Our Medicare contracts with CMS renew annually. Our military services contracts with the federal government and our contracts with various state Medicaid programs generally are multi-year contracts subject to annual renewal provisions. Individual polices are subject to the requirements of the Health Care Reform Law as discussed previously.

Premiums Revenue

We bill and collect premium from employer groups and members in our Medicare and other individual products monthly. We receive monthly premiums from the federal government and various states according to government specified payment rates and various contractual terms. Changes in revenues for our Medicare and individual commercial medical products resulting from the periodic changes in risk-adjustment scores derived from medical diagnoses for our membership and changes in risk corridor estimates are recognized when the amounts become determinable and the collectibility is reasonably assured.

Premiums revenue is estimated by multiplying the membership covered under the various contracts by the contractual rates. Premiums revenue is recognized as income in the period members are entitled to receive services, and is net of estimated uncollectible amounts, retroactive membership adjustments, and adjustments to recognize rebates under the minimum benefit ratios required under the Health Care Reform Law. We estimate policyholder rebates by projecting calendar year minimum benefit ratios for the individual, small group, and large group markets, as defined by the Health Care Reform Law using a methodology prescribed by HHS, separately by state and legal entity. Beginning

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in 2014, Medicare Advantage products were also subject to minimum benefit ratio requirements under the Health Care Reform Law. Estimated calendar year rebates recognized ratably during the year are revised each period to reflect current experience. Retroactive membership adjustments result from enrollment changes not yet processed, or not yet reported by an employer group or the government. We routinely monitor the collectibility of specific accounts, the aging of receivables, historical retroactivity trends, estimated rebates, as well as prevailing and anticipated economic conditions, and reflect any required adjustments in current operations. Premiums received prior to the service period are recorded as unearned revenues.

Medicare Part D

We cover prescription drug benefits in accordance with Medicare Part D under multiple contracts with CMS. The payments we receive monthly from CMS and members, which are determined from our annual bid, represent amounts for providing prescription drug insurance coverage. We recognize premiums revenue for providing this insurance coverage ratably over the term of our annual contract. Our CMS payment is subject to risk sharing through the Medicare Part D risk corridor provisions. In addition, receipts for reinsurance and low-income cost subsidies as well as receipts for certain discounts on brand name prescription drugs in the coverage gap represent payments for prescription drug costs for which we are not at risk.

The risk corridor provisions compare costs targeted in our bids to actual prescription drug costs, limited to actual costs that would have been incurred under the standard coverage as defined by CMS. Variances exceeding certain thresholds may result in CMS making additional payments to us or require us to refund to CMS a portion of the premiums we received. As risk corridor provisions are considered in our overall annual bid process, we estimate and recognize an adjustment to premiums revenue related to these provisions based upon pharmacy claims experience. We record a receivable or payable at the contract level and classify the amount as current or long-term in our consolidated balance sheets based on the timing of expected settlement.

Reinsurance and low-income cost subsidies represent funding from CMS in connection with the Medicare Part D program for which we assume no risk. Reinsurance subsidies represent funding from CMS for its portion of prescription drug costs which exceed the member’s out-of-pocket threshold, or the catastrophic coverage level. Low-income cost subsidies represent funding from CMS for all or a portion of the deductible, the coinsurance and co-payment amounts above the out-of-pocket threshold for low-income beneficiaries. Monthly prospective payments from CMS for reinsurance and low-income cost subsidies are based on assumptions submitted with our annual bid. A reconciliation and related settlement of CMS’s prospective subsidies against actual prescription drug costs we paid is made after the end of the year. The Health Care Reform Law mandates consumer discounts of 50% on brand name prescription drugs for Part D plan participants in the coverage gap. These discounts are funded by CMS and pharmaceutical manufacturers while we administer the application of these funds. We account for these subsidies and discounts as a deposit in our consolidated balance sheets and as a financing activity under receipts (withdrawals) from contract deposits in our consolidated statements of cash flows. For 2015, subsidy and discount payments of $8.9 billion exceeded reimbursements of $8.6 billion by $361 million. For 2014, subsidy and discount payments of $6.7 billion exceeded reimbursements of $5.8 billion by $945 million. For 2013, subsidy and discount payments of $4.8 billion exceeded reimbursements of $4.6 billion by $154 million. We do not recognize premiums revenue or benefit expenses for these subsidies or discounts. Receipt and payment activity is accumulated at the contract level and recorded in our consolidated balance sheets in other current assets or trade accounts payable and accrued expenses depending on the contract balance at the end of the reporting period.

Settlement of the reinsurance and low-income cost subsidies as well as the risk corridor payment is based on a reconciliation made approximately 9 months after the close of each calendar year. Settlement with CMS for brand name prescription drug discounts is based on a reconciliation made approximately 14 to 18 months after the close of each calendar year. We continue to revise our estimates with respect to the risk corridor provisions based on subsequent period pharmacy claims data. See Note 6 for detail regarding amounts recorded to our consolidated balance sheets related to the risk corridor settlement and subsidies from CMS.

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Services Revenue

Patient services revenue

Patient services include injury and illness care and related services as well as other healthcare services related to employer needs or as required by law. Patient services revenues are recognized in the period services are provided to the customer when the sales price is fixed or determinable, and are net of contractual allowances.

Administrative services fees

Administrative services fees cover the processing of claims, offering access to our provider networks and clinical programs, and responding to customer service inquiries from members of self-funded groups. Revenues from providing administration services, also known as administrative services only, or ASO, are recognized in the period services are performed and are net of estimated uncollectible amounts. ASO fees are estimated by multiplying the membership covered under the various contracts by the contractual rates. Under ASO contracts, self-funded employers retain the risk of financing substantially all of the cost of health benefits. However, many ASO customers purchase stop loss insurance coverage from us to cover catastrophic claims or to limit aggregate annual costs. Accordingly, we have recorded premiums revenue and benefits expense related to these stop loss insurance contracts. We routinely monitor the collectibility of specific accounts, the aging of receivables, as well as prevailing and anticipated economic conditions, and reflect any required adjustments in current operations. ASO fees received prior to the service period are recorded as unearned revenues.

Under our current TRICARE South Region contract with the Department of Defense, we provide administrative services, including offering access to our provider networks and clinical programs, claim processing, customer service, enrollment, and other services, while the federal government retains all of the risk of the cost of health benefits. We account for revenues under the current contract net of estimated health care costs similar to an administrative services fee only agreement. The current contract includes fixed administrative services fees and incentive fees and penalties. Administrative services fees are recognized as services are performed.

Our TRICARE members are served by both in-network and out-of-network providers in accordance with the current contract. We pay health care costs related to these services to the providers and are subsequently reimbursed by the DoD for such payments. We account for the payments of the federal government’s claims and the related reimbursements under deposit accounting in our consolidated balance sheets and as a financing activity under receipts (withdrawals) from contract deposits in our consolidated statements of cash flows. For 2015, health care cost reimbursements and payments were each approximately $3.3 billion, with payments exceeding reimbursements by $4 million for the year. For 2014, health care cost reimbursements and payments were each $3.2 billion. For 2013, health care cost reimbursements and payments were each approximately $3.2 billion, with reimbursements exceeding payments by $5 million for the year.

Receivables

Receivables, including premium receivables, patient services revenue receivables, and ASO fee receivables, are shown net of allowances for estimated uncollectible accounts, retroactive membership adjustments, and contractual allowances.

Policy Acquisition Costs

Policy acquisition costs are those costs that relate directly to the successful acquisition of new and renewal insurance policies. Such costs include commissions, costs of policy issuance and underwriting, and other costs we incur to acquire new business or renew existing business. We expense policy acquisition costs related to our employer-group prepaid health services policies as incurred. These short-duration employer-group prepaid health services policies typically have a 1-year term and may be cancelled upon 30 days notice by the employer group.

Life insurance, annuities, and certain health and other supplemental policies sold to individuals are accounted for as long-duration insurance products because they are expected to remain in force for an extended period beyond one year and premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. As

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a result, we defer policy acquisition costs, primarily consisting of commissions, and amortize them over the estimated life of the policies in proportion to premiums earned. Deferred acquisition costs are reviewed to determine if they are recoverable from future income. See Note 18.

Beginning in 2014, health policies sold to individuals that conform to the Health Care Reform Law are accounted for under a short-duration model and accordingly policy acquisition costs are expensed as incurred because premiums received in the current year are intended to pay anticipated benefits in that year. In addition, as previously underwritten members transition to plans compliant with the Health Care Reform Law, it results in policy lapses and the recognition of previously deferred acquisition costs.

Long-Lived Assets

Property and equipment is recorded at cost. Gains and losses on sales or disposals of property and equipment are included in operating costs. Certain costs related to the development or purchase of internal-use software are capitalized. Depreciation is computed using the straight-line method over estimated useful lives ranging from 3 to 10 years for equipment, 3 to 7 years for computer software, and 20 to 40 years for buildings. Improvements to leased facilities are depreciated over the shorter of the remaining lease term or the anticipated life of the improvement.

We periodically review long-lived assets, including property and equipment and other intangible assets, for impairment whenever adverse events or changes in circumstances indicate the carrying value of the asset may not be recoverable. Losses are recognized for a long-lived asset to be held and used in our operations when the undiscounted future cash flows expected to result from the use of the asset are less than its carrying value. We recognize an impairment loss based on the excess of the carrying value over the fair value of the asset. A long-lived asset held for sale is reported at the lower of the carrying amount or fair value less costs to sell. Depreciation expense is not recognized on assets held for sale. Losses are recognized for a long-lived asset to be abandoned when the asset ceases to be used. In addition, we periodically review the estimated lives of all long-lived assets for reasonableness.

Goodwill and Other Intangible Assets

Goodwill represents the unamortized excess of cost over the fair value of the net tangible and other intangible assets acquired. We are required to test at least annually for impairment at a level of reporting referred to as the reporting unit, and more frequently if adverse events or changes in circumstances indicate that the asset may be impaired. A reporting unit either is our operating segments or one level below the operating segments, referred to as a component, which comprise our reportable segments. A component is considered a reporting unit if the component constitutes a business for which discrete financial information is available that is regularly reviewed by management. We aggregate the components of an operating segment into one reporting unit if they have similar economic characteristics. Goodwill is assigned to the reporting unit that is expected to benefit from a specific acquisition.

We use a two-step process to review goodwill for impairment. The first step is a screen for potential impairment, and the second step measures the amount of impairment, if any. Impairment tests are performed, at a minimum, in the fourth quarter of each year supported by our long-range business plan and annual planning process. We rely on an evaluation of future discounted cash flows to determine fair value of our reporting units. Impairment tests completed for 2015, 2014, and 2013 did not result in an impairment loss.

Other intangible assets primarily relate to acquired customer contracts/relationships and are included with other long-term assets in the consolidated balance sheets. Other intangible assets are amortized over the useful life, based upon the pattern of future cash flows attributable to the asset. This sometimes results in an accelerated method of amortization for customer contracts because the asset tends to dissipate at a more rapid rate in earlier periods. Other than customer contracts, other intangible assets generally are amortized using the straight-line method. We review other finite-lived intangible assets for impairment under our long-lived asset policy.

Benefits Payable and Benefits Expense Recognition

Benefits expense includes claim payments, capitation payments, pharmacy costs net of rebates, allocations of certain centralized expenses and various other costs incurred to provide health insurance coverage to members, as well as estimates of future payments to hospitals and others for medical care and other supplemental benefits provided on

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or prior to the balance sheet date. Capitation payments represent monthly contractual fees disbursed to primary care and other providers who are responsible for providing medical care to members. Pharmacy costs represent payments for members’ prescription drug benefits, net of rebates from drug manufacturers. Receivables for such pharmacy rebates are included in other current assets in our consolidated balance sheets. Other supplemental benefits include dental, vision, and other supplemental health and financial protection products.

We estimate the costs of our benefits expense payments using actuarial methods and assumptions based upon claim payment patterns, medical cost inflation, historical developments such as claim inventory levels and claim receipt patterns, and other relevant factors, and record benefit reserves for future payments. We continually review estimates of future payments relating to claims costs for services incurred in the current and prior periods and make necessary adjustments to our reserves.

We reassess the profitability of our contracts for providing insurance coverage to our members when current operating results or forecasts indicate probable future losses. We establish a premium deficiency reserve in current operations to the extent that the sum of expected future costs, claim adjustment expenses, and maintenance costs exceeds related future premiums under contracts without consideration of investment income. For purposes of determining premium deficiencies, contracts are grouped in a manner consistent with our method of acquiring, servicing, and measuring the profitability of such contracts. Losses recognized as a premium deficiency result in a beneficial effect in subsequent periods as operating losses under these contracts are charged to the liability previously established. Because the majority of our member contracts renew annually, we would not record a material premium deficiency reserve, except when unanticipated adverse events or changes in circumstances indicate otherwise. In the fourth quarter of 2015, we recognized a premium deficiency reserve for our individual commercial medical business compliant with the Health Care Reform Law associated with the 2016 coverage year as discussed in more detail in Note 7.

We believe our benefits payable are adequate to cover future claims payments required. However, such estimates are based on knowledge of current events and anticipated future events. Therefore, the actual liability could differ materially from the amounts provided.

Future policy benefits payable

Future policy benefits payable include liabilities for long-duration insurance policies including long-term care, life insurance, annuities, and certain health and other supplemental policies sold to individuals for which some of the premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. At policy issuance, these reserves are recognized on a net level premium method based on interest rates, mortality, morbidity, and maintenance expense assumptions. Interest rates are based on our expected net investment returns on the investment portfolio supporting the reserves for these blocks of business. Mortality, a measure of expected death, and morbidity, a measure of health status, assumptions are based on published actuarial tables, modified based upon actual experience. Changes in estimates of these reserves are recognized as an adjustment to benefits expense in the period the changes occur. We perform loss recognition tests at least annually in the fourth quarter, and more frequently if adverse events or changes in circumstances indicate that the level of the liability, together with the present value of future gross premiums, may not be adequate to provide for future expected policy benefits and maintenance costs. We adjust future policy benefits payable for the additional liability that would have been recorded if investment securities backing the liability had been sold at their stated aggregate fair value and the proceeds reinvested at current yields. We include the impact of this adjustment, if any, net of applicable deferred taxes, with the change in unrealized investment gain (loss) in accumulated other comprehensive income in stockholders’ equity. As discussed previously, beginning in 2014, health policies sold to individuals that conform to the Health Care Reform Law are accounted for under a short-duration model under which policy reserves are not established because premiums received in the current year are intended to pay anticipated benefits in that year. In addition, as previously underwritten members transition to plans compliant with the Health Care Reform Law, it results in policy lapses and the release of reserves for future policy benefits.

Book Overdraft

Under our cash management system, checks issued but not yet presented to banks that would result in negative bank balances when presented are classified as a current liability in the consolidated balance sheets. Changes in book overdrafts from period to period are reported in the consolidated statement of cash flows as a financing activity.

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Income Taxes

We recognize an asset or liability for the deferred tax consequences of temporary differences between the tax bases of assets or liabilities and their reported amounts in the consolidated financial statements. These temporary differences will result in taxable or deductible amounts in future years when the reported amounts of the assets or liabilities are recovered or settled. We also recognize the future tax benefits such as net operating and capital loss carryforwards as deferred tax assets. A valuation allowance is provided against these deferred tax assets if it is more likely than not that some portion or all of the deferred tax assets will not be realized. Future years’ tax expense may be increased or decreased by adjustments to the valuation allowance or to the estimated accrual for income taxes.

We record tax benefits when it is more likely than not that the tax return position taken with respect to a particular transaction will be sustained. A liability, if recorded, is not considered resolved until the statute of limitations for the relevant taxing authority to examine and challenge the tax position has expired, or the tax position is ultimately settled through examination, negotiation, or litigation. We classify interest and penalties associated with uncertain tax positions in our provision for income taxes.

Derivative Financial Instruments

On October 29, 2012, we acquired a noncontrolling equity interest in MCCI Holdings, LLC, or MCCI, a privately held Medical Services Organization, or MSO, headquartered in Miami, Florida, that primarily coordinates medical care for Medicare Advantage beneficiaries in Florida, Texas and Georgia. Our agreement with MCCI includes a put option that would allow the controlling interest holder to put their interest to us beginning in 2018 as well as a call option that would allow us to purchase the controlling interest beginning in 2021. Accordingly, we recorded, at fair value, a liability and an asset associated with the put and call, respectively. Changes in the fair value of the liability and asset during the years ended December 31,2015, 2014, and 2013 were not material to our results of operations, financial condition, or cash flows.

At times, we may use interest-rate swap agreements to manage our exposure to interest rate risk. The differential between fixed and variable rates to be paid or received is accrued and recognized over the life of the agreements as adjustments to interest expense in the consolidated statements of income. We were not party to any interest-rate swap agreements in 2015, 2014, or 2013.

Related Party

As noted above, MCCI is a related party to Humana. In December 2015, we purchased a note receivable directly from a third-party bank syndicate related to the financing of MCCI's business and extended the exercise date of the put option to 2018 and the call option to 2021 as previously discussed. The $284 million note receivable bears interest at 10% annually, payable in quarterly installments, and matures in December 2020. We have also entered into a revolving note agreement providing a line of credit up to $55 million under which no amounts have been drawn. The note receivable is included with other long-term assets in our consolidated balance sheet and with purchases of investment securities in our consolidated statement of cash flows. The related interest income is included in investment income in our consolidated statement of income. MCCI provides services to Humana Medicare Advantage members under capitation contracts with our health plans. Under these capitation agreements with Humana, MCCI assumes the financial risk associated with these Medicare Advantage members. We also advanced MCCI $9 million, with repayment terms tied to the performance under the capitation agreements. We recognized benefits expense of approximately $1.0 billion in 2015, $962 million in 2014 and $873 million in 2013 under these capitation agreements with MCCI.

Stock-Based Compensation

We generally recognize stock-based compensation expense, as determined on the date of grant at fair value, on a straight-line basis over the period during which an employee is required to provide service in exchange for the award (the vesting period). In addition, for awards with both time and performance-based conditions, we generally recognize compensation expense on a straight line basis over the vesting period when it is probable that the performance condition will be achieved. However, prior to July 2, 2015, for awards granted to retirement eligible employees, compensation expense is recognized on a straight-line basis over the shorter of the requisite service period or the period from the date

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of grant to an employee’s eligible retirement date. For awards granted on or after July 2, 2015 to retirement eligible employees, we recognize expense on a straight-line basis over the service period (the vesting period). We estimate expected forfeitures and recognize compensation expense only for those awards which are expected to vest. We estimate the grant-date fair value of stock options using the Black-Scholes option-pricing model. In addition, we report certain tax effects of stock-based compensation as a financing activity rather than an operating activity in the consolidated statement of cash flows. Additional detail regarding our stock-based compensation plans is included in Note 13.

Earnings Per Common Share

We compute basic earnings per common share on the basis of the weighted-average number of unrestricted common shares outstanding. Diluted earnings per common share is computed on the basis of the weighted-average number of unrestricted common shares outstanding plus the dilutive effect of outstanding employee stock options and restricted shares, or units, using the treasury stock method.

Fair Value

Assets and liabilities measured at fair value are categorized into a fair value hierarchy based on whether the inputs to valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our own assumptions about the assumptions market participants would use. The fair value hierarchy includes three levels of inputs that may be used to measure fair value as described below.

Level 1 – Quoted prices in active markets for identical assets or liabilities. Level 1 assets and liabilities include debt securities that are traded in an active exchange market.

Level 2 – Observable inputs other than Level 1 prices such as quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments as well as debt securities whose value is determined using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data.

Level 3 – Unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities. Level 3 includes assets and liabilities whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques reflecting our own assumptions about the assumptions market participants would use as well as those requiring significant management judgment.

Fair value of actively traded debt securities are based on quoted market prices. Fair value of other debt securities are based on quoted market prices of identical or similar securities or based on observable inputs like interest rates generally using a market valuation approach, or, less frequently, an income valuation approach and are generally classified as Level 2. We obtain at least one price for each security from a third party pricing service. These prices are generally derived from recently reported trades for identical or similar securities, including adjustments through the reporting date based upon observable market information. When quoted prices are not available, the third party pricing service may use quoted market prices of comparable securities or discounted cash flow analyses, incorporating inputs that are currently observable in the markets for similar securities. Inputs that are often used in the valuation methodologies include benchmark yields, reported trades, credit spreads, broker quotes, default rates, and prepayment speeds. We are responsible for the determination of fair value and as such we perform analysis on the prices received from the third party pricing service to determine whether the prices are reasonable estimates of fair value. Our analysis includes a review of monthly price fluctuations as well as a quarterly comparison of the prices received from the pricing service to prices reported by our third party investment advisor. In addition, on a quarterly basis we examine the underlying inputs and assumptions for a sample of individual securities across asset classes, credit rating levels, and various durations.

Fair value of privately held debt securities, as well as auction rate securities, are estimated using a variety of valuation methodologies, including both market and income approaches, where an observable quoted market does not

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exist and are generally classified as Level 3. For privately-held debt securities, such methodologies include reviewing the value ascribed to the most recent financing, comparing the security with securities of publicly-traded companies in similar lines of business, and reviewing the underlying financial performance including estimating discounted cash flows. Auction rate securities are debt instruments with interest rates that reset through periodic short-term auctions. From time to time, liquidity issues in the credit markets have led to failed auctions. Given the liquidity issues, fair value could not be estimated based on observable market prices, and as such, unobservable inputs were used. For auction rate securities, valuation methodologies include consideration of the quality of the sector and issuer, underlying collateral, underlying final maturity dates, and liquidity.

Recently Issued Accounting Pronouncements

In January 2016, the Financial Accounting Standards Board, or FASB, issued new guidance related to classification and measurement of financial instruments which requires equity securities that are not accounted for using the equity method or that do not result in consolidation, to be accounted for at fair value with changes in fair value recognized through net income. The new guidance is effective for us beginning with annual and interim periods in 2018 with early adoption permitted under certain circumstances. We are currently evaluating the impact, if any, on our results of operations, financial position, and cash flows.

In November 2015, the FASB issued new guidance related to accounting for income taxes which changes the balance sheet classification of deferred taxes, requiring deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position. The new guidance is effective for us beginning with annual and interim periods in 2017, with early adoption permitted. We elected to early adopt the guidance and have classified all deferred tax liabilities and assets as noncurrent in our consolidated balance sheet at December 31, 2015 to simplify their presentation. Prior periods were not retrospectively adjusted. The adoption of the new guidance did not have any impact on our results of operations or cash flows.

In May 2015, the FASB issued new guidance requiring insurance entities to provide additional disclosures about claim liabilities including paid claims development information by accident year and claim frequency data and related methodologies. The guidance is effective for us beginning with the 2016 annual reporting period and interim periods beginning in 2017. We are currently evaluating the impact the new guidance will have on our disclosures.

In April 2015, the FASB issued new guidance to help entities determine whether a cloud computing arrangement contains a software license that should be accounted for as internal-use software or as a service contract. The guidance is effective for us beginning with interim and annual reporting periods in 2016, with early adoption permitted. Upon adoption, an entity has the option to apply the provisions either prospectively to all arrangements entered into or materially modified, or retrospectively. We are currently evaluating the impact, if any, on our results of operations, financial position, and cash flows.

In March 2015, the FASB issued new guidance which changes the presentation of debt issuance costs from an asset to a direct reduction of the related debt liability. The new guidance is effective for us beginning with annual and interim periods in 2016 with early adoption permitted. The adoption of the new guidance will not have a material impact on our results of operations, financial condition, or cash flows.

In February 2015, the FASB issued an amendment to current consolidation guidance that modifies the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, eliminating the presumption that a general partner should consolidate a limited partnership, and affects the consolidation analysis of reporting entities that are involved with variable interest entities. The new guidance is effective for us beginning with interim and annual reporting periods in 2016, with early adoption permitted. All legal entities are subject to reevaluation under the revised consolidation model. We are currently evaluating the impact, if any, on our results of operations, financial position, and cash flows.

In May 2014, the FASB issued new guidance that amends the accounting for revenue recognition. The amendments are intended to provide a more robust framework for addressing revenue issues, improve comparability of revenue recognition practices, and improve disclosure requirements. Insurance contracts are not included in the scope of this new guidance. In July 2015, the FASB decided to defer the effective date provided in the new revenue guidance by

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one year. Giving effect to this deferral, the new guidance is effective for us beginning with annual and interim periods in 2018. We are currently evaluating the impact on our results of operations, financial condition, and cash flows.

There are no other recently issued accounting standards that apply to us or that are expected to have a material impact on our results of operations, financial condition, or cash flows.

3. ACQUISITIONS AND DIVESTITURES

On June 1, 2015, we completed the sale of our wholly owned subsidiary, Concentra Inc., or Concentra, to MJ Acquisition Corporation, a joint venture between Select Medical Holdings Corporation and Welsh, Carson, Anderson & Stowe XII, L.P., a private equity fund, for approximately $1,055 million in cash, excluding approximately $22 million of transaction costs. In connection with the sale, we recognized a pre-tax gain, net of transaction costs, of $270 million which is reported as gain on sale of business in the accompanying condensed consolidated statements of income forthe year ended December 31, 2015.

In March 2015, we classified Concentra as held-for-sale and aggregated Concentra's assets and liabilities separately on the balance sheet, including a reclassification of the December 31, 2014 balance sheet for comparative purposes. The assets and liabilities of Concentra that were disposed of on June 1, 2015 and classified as held-for-sale as of December 31, 2014 were as follows:

	June 1, 2015		December 31, 2014
Assets	(in millions)
Receivables, net	$	130	$	115
Property and equipment, net	197		191
Goodwill	480		480
Other intangible assets, net	124		132
Other assets	27		25
Total assets disposed/held-for-sale	$	958	$	943
Liabilities
Trade accounts payable and accrued expenses	81		90
Other liabilities	114		116
Total liabilities disposed/held-for-sale	$	195	$	206
Net assets disposed	$	763	$	737

For the year ended December 31, 2015, the accompanying condensed consolidated statements of income include revenues related to Concentra of $411 million in 2015, $998 million in 2014, and $981 million in 2013.

On September 6, 2013, we acquired American Eldercare Inc., or American Eldercare, the largest provider of nursing home diversion services in the state of Florida, serving frail and elderly individuals in home and community-based settings. American Eldercare complements our core capabilities and strength in serving seniors and disabled individuals with a unique focus on individualized and integrated care, and has contracts to provide Medicaid long-term support services across the entire state of Florida. The enrollment effective dates for the various regions ranged from August 2013 to March 2014. The allocation of the purchase price resulted in goodwill of $76 million and other intangible assets of $75 million. The goodwill was assigned to the Retail segment. The other intangible assets, which primarily consist of customer contracts and technology, have a weighted average useful life of 9.3 years. Goodwill and other intangible assets are amortizable as deductible expenses for tax purposes.

The results of operations and financial condition of American Eldercare has been included in our consolidated statements of income and consolidated balance sheets from the acquisition date. In addition, during 2015, 2014 and

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2013, we acquired other health and wellness and technology related businesses which, individually or in the aggregate, have not had a material impact on our results of operations, financial condition, or cash flows. The results of operations and financial condition of these businesses have been included in our condensed consolidated statements of income and condensed consolidated balance sheets from the respective acquisition dates. Acquisition-related costs recognized in each of 2015, 2014, and 2013 were not material to our results of operations. The pro forma financial information assuming the acquisitions had occurred as of the beginning of the calendar year prior to the year of acquisition, as well as the revenues and earnings generated during the year of acquisition, were not material for disclosure purposes.

4. INVESTMENT SECURITIES

Investment securities classified as current and long-term were as follows at December 31, 2015 and 2014, respectively:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in millions)
December 31, 2015
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	331	$	2	$	(1	)	$	332
Mortgage-backed securities	1,902		12		(23		)	1,891
Tax-exempt municipal securities	2,611		61		(4		)	2,668
Mortgage-backed securities:
Residential	13		—		—			13
Commercial	1,024		2		(41		)	985
Asset-backed securities	264		1		(2		)	263
Corporate debt securities	2,873		140		(55		)	2,958
Total debt securities	$	9,018	$	218	$	(126	)	$	9,110
December 31, 2014
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	365	$	10	$	(1	)	$	374
Mortgage-backed securities	1,453		50		(5		)	1,498
Tax-exempt municipal securities	2,931		140		(3		)	3,068
Mortgage-backed securities:
Residential	17		—		—			17
Commercial	846		16		(19		)	843
Asset-backed securities	28		1		—			29
Corporate debt securities	3,432		299		(13		)	3,718
Total debt securities	$	9,072	$	516	$	(41	)	$	9,547

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Gross unrealized losses and fair values aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position were as follows at December 31, 2015 and 2014, respectively:

	Less than 12 months					12 months or more					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	(in millions)
December 31, 2015
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	195	$	(1	)	$	14	$	—		$	209	$	(1	)
Mortgage-backed securities	1,484		(20		)	86		(3		)	1,570		(23		)
Tax-exempt municipal securities	843		(3		)	52		(1		)	895		(4		)
Mortgage-backed securities:
Residential	2		—			4		—			6		—
Commercial	626		(13		)	265		(28		)	891		(41		)
Asset-backed securities	258		(2		)	—		—			258		(2		)
Corporate debt securities	918		(45		)	63		(10		)	981		(55		)
Total debt securities	$	4,326	$	(84	)	$	484	$	(42	)	$	4,810	$	(126	)
December 31, 2014
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	79	$	—		$	80	$	(1	)	$	159	$	(1	)
Mortgage-backed securities	22		—			320		(5		)	342		(5		)
Tax-exempt municipal securities	131		(1		)	118		(2		)	249		(3		)
Mortgage-backed securities:
Residential	1		—			4		—			5		—
Commercial	31		(1		)	267		(18		)	298		(19		)
Asset-backed securities	13		—			—		—			13		—
Corporate debt securities	219		(6		)	128		(7		)	347		(13		)
Total debt securities	$	496	$	(8	)	$	917	$	(33	)	$	1,413	$	(41	)

Approximately 98% of our debt securities were investment-grade quality, with a weighted average credit rating of AA by S&P at December 31, 2015. Most of the debt securities that were below investment-grade were rated BB, the higher end of the below investment-grade rating scale. At December 31, 2015, 7% of our tax-exempt municipal securities were pre-refunded, generally with U.S. government and agency securities. Tax-exempt municipal securities that were not pre-refunded were diversified among general obligation bonds of U.S. states and local municipalities as well as special revenue bonds. General obligation bonds, which are backed by the taxing power and full faith of the issuer, accounted for 42% of the tax-exempt municipals that were not pre-refunded in the portfolio. Special revenue bonds, issued by a municipality to finance a specific public works project such as utilities, water and sewer, transportation, or education, and supported by the revenues of that project, accounted for the remaining 58% of these municipals. Our general obligation bonds are diversified across the United States with no individual state exceeding 11%. In addition, 6% of our tax-exempt securities were insured by bond insurers and had an equivalent weighted average S&P credit rating of AA exclusive of the bond insurers’ guarantee. Our investment policy limits investments in a single issuer and requires diversification among various asset types.

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Residential mortgage back securities comprised approximately 98% of our agency mortgage-backed securities at December 31, 2015 and 99% at December 31, 2014.

The recoverability of our non-agency residential and commercial mortgage-backed securities is supported by factors such as seniority, underlying collateral characteristics and credit enhancements. These residential and commercial mortgage-backed securities at December 31, 2015 primarily were composed of senior tranches having high credit support, with over 99% of the collateral consisting of prime loans. The weighted average credit rating of all commercial mortgage-backed securities was AA+ at December 31, 2015.

The percentage of corporate securities associated with the financial services industry was 25% at December 31, 2015 and 21% at December 31, 2014.

Our unrealized loss from all securities was generated from approximately 690 positions out of a total of approximately 2,000 positions at December 31, 2015. All issuers of securities we own that were trading at an unrealized loss at December 31, 2015 remain current on all contractual payments. After taking into account these and other factors previously described, we believe these unrealized losses primarily were caused by an increase in market interest rates in the current markets than when the securities were purchased. At December 31, 2015, we did not intend to sell the securities with an unrealized loss position in accumulated other comprehensive income, and it is not likely that we will be required to sell these securities before recovery of their amortized cost basis. As a result, we believe that the securities with an unrealized loss were not other-than-temporarily impaired at December 31, 2015.

The detail of realized gains (losses) related to investment securities and included within investment income was as follows for the years ended December 31, 2015, 2014, and 2013:

	2015			2014			2013
	(in millions)
Gross realized gains	$	179		$	29		$	33
Gross realized losses	(33		)	(9		)	(11		)
Net realized capital gains	$	146		$	20		$	22

There were no material other-than-temporary impairments in 2015, 2014, or 2013.

The contractual maturities of debt securities available for sale at December 31, 2015, regardless of their balance sheet classification, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Amortized Cost		Fair Value
	(in millions)
Due within one year	$	438	$	439
Due after one year through five years	1,829		1,871
Due after five years through ten years	1,244		1,264
Due after ten years	2,304		2,384
Mortgage and asset-backed securities	3,203		3,152
Total debt securities	$	9,018	$	9,110

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5. FAIR VALUE

Financial Assets

The following table summarizes our fair value measurements at December 31, 2015 and 2014, respectively, for financial assets measured at fair value on a recurring basis:

			Fair Value Measurements Using
	Fair Value		Quoted Prices in Active Markets (Level 1)		Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
	(in millions)
December 31, 2015
Cash equivalents	$	2,229	$	2,229	$	—	$	—
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	332		—		332		—
Mortgage-backed securities	1,891		—		1,891		—
Tax-exempt municipal securities	2,668		—		2,663		5
Mortgage-backed securities:
Residential	13		—		13		—
Commercial	985		—		985		—
Asset-backed securities	263		—		263		—
Corporate debt securities	2,958		—		2,952		6
Total debt securities	9,110		—		9,099		11
Total invested assets	$	11,339	$	2,229	$	9,099	$	11
December 31, 2014
Cash equivalents	$	1,712	$	1,712	$	—	$	—
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	374		—		374		—
Mortgage-backed securities	1,498		—		1,498		—
Tax-exempt municipal securities	3,068		—		3,060		8
Mortgage-backed securities:
Residential	17		—		17		—
Commercial	843		—		843		—
Asset-backed securities	29		—		28		1
Corporate debt securities	3,718		—		3,695		23
Total debt securities	9,547		—		9,515		32
Total invested assets	$	11,259	$	1,712	$	9,515	$	32

There were no material transfers between Level 1 and Level 2 during 2015 or 2014.

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Our Level 3 assets had a fair value of $11 million at December 31, 2015, or 0.1% of our total invested assets. During the years ended December 31, 2015, 2014, and 2013, the changes in the fair value of the assets measured using significant unobservable inputs (Level 3) were comprised of the following:

	For the years ended December 31,
	2015									2014								2013
	Private Placements			Auction Rate Securities			Total			Private Placements		Auction Rate Securities			Total			Private Placements			Auction Rate Securities		Total
	(in millions)
Beginning balance at January 1	$	24		$	8		$	32		$	24	$	13		$	37		$	25		$	13	$	38
Total gains or losses:
Realized in earnings	(1		)	—			(1		)	—		—			—			—			—		—
Unrealized in other comprehensive income	—			—			—			—		—			—			—			—		—
Purchases	—			—			—			—		—			—			—			—		—
Sales	(17		)	(3		)	(20		)	—		(5		)	(5		)	—			—		—
Settlements	—			—			—			—		—			—			(1		)	—		(1		)
Balance at December 31	$	6		$	5		$	11		$	24	$	8		$	32		$	24		$	13	$	37

Financial Liabilities

Our long-term debt, recorded at carrying value in our consolidated balance sheets, was $3,821 million at December 31, 2015 and $3,825 million at December 31, 2014. The fair value of our long-term debt was $3,986 million at December 31, 2015 and $4,102 million at December 31, 2014. The fair value of our long-term debt is determined based on Level 2 inputs, including quoted market prices for the same or similar debt, or if no quoted market prices are available, on the current prices estimated to be available to us for debt with similar terms and remaining maturities.

Due to the short-term nature, carrying value approximates fair value for our commercial paper borrowings.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

As disclosed in Note 3, we completed our acquisition of American Eldercare and other companies during 2015, 2014, and 2013. The values of net tangible assets acquired and the resulting goodwill and other intangible assets were recorded at fair value using Level 3 inputs. The majority of the related tangible assets acquired and liabilities assumed were recorded at their carrying values as of the respective dates of acquisition, as their carrying values approximated their fair values due to their short-term nature. The fair values of goodwill and other intangible assets acquired in these acquisitions were internally estimated primarily based on the income approach. The income approach estimates fair value based on the present value of the cash flows that the assets are expected to generate in the future. We developed internal estimates for the expected cash flows and discount rates in the present value calculations. Other than assets acquired and liabilities assumed in these acquisitions, there were no material assets or liabilities measured at fair value on a nonrecurring basis during 2015, 2014, or 2013.

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6. MEDICARE PART D

As discussed in Note 2, we cover prescription drug benefits in accordance with Medicare Part D under multiple contracts with CMS. The accompanying consolidated balance sheets include the following amounts associated with Medicare Part D as of December 31, 2015 and 2014. CMS subsidies/discounts in the table below include the reinsurance and low-income cost subsidies funded by CMS for which we assume no risk as well as brand name prescription drug discounts for Part D plan participants in the coverage gap funded by CMS and pharmaceutical manufacturers.

	2015						2014
	Risk Corridor Settlement			CMS Subsidies/ Discounts			Risk Corridor Settlement			CMS Subsidies/ Discounts
	(in millions)
Other current assets	$	25		$	2,082		$	105		$	1,690
Trade accounts payable and accrued expenses	(47		)	(63		)	(36		)	(32		)
Net current (liability) asset	$	(22	)	$	2,019		$	69		$	1,658

7. HEALTH CARE REFORM

Operating results for our individual commercial medical business compliant with the Health Care Reform Law have been challenged primarily due to unanticipated modifications in the program subsequent to the passing of the Health Care Reform Law, resulting in higher covered population morbidity and the ensuing enrollment and claims issues causing volatility in claims experience. We took a number of actions in 2015 to improve the profitability of our individual commercial medical business in 2016.These actions were subject to regulatory restrictions in certain geographies and included premium increases for the 2016 coverage year related generally to the first half of 2015 claims experience, the discontinuation of certain products as well as exit of certain markets for 2016, network improvements, enhancements to claims and clinical processes and administrative cost control. Despite these actions, the deterioration in the second half of 2015 claims experience together with 2016 open enrollment results indicating the retention of many high-utilizing members for 2016 resulted in a probable future loss. As a result of our assessment of the profitability of our individual medical policies compliant with the Health Care Reform Law, in the fourth quarter of 2015, we recorded a provision for probable future losses (premium deficiency reserve) for the 2016 coverage year of $176 million in benefits payable in our consolidated balance sheet with a corresponding increase in benefits expense in our consolidated statement of income. The premium deficiency reserve includes the estimated benefit of approximately $340 million associated with risk corridor provisions expected for the 2016 coverage year.

On June 30, 2015 we received notification from CMS of risk adjustment and reinsurance settlement amounts for 2014. We revised our 2014 coverage year estimates to reflect actual amounts and also made a corresponding adjustment to our risk corridor estimate based on these results. The change in estimate for risk adjustment was substantially offset by the corresponding change in estimate for risk corridor, both of which are reflected as changes in premiums revenue in our consolidated statements of income. The change in estimate related to the 3Rs for the 2014 coverage year was a decline in the estimated net receivable of approximately $43 million for the year ended December 31, 2015. In addition, we revised our 3Rs estimates for the 2015 coverage year based on the data from CMS for 2014.

During the year ended December 31, 2015, we paid $186 million in risk adjustment charges and $1 million in risk corridor charges associated with the 2014 coverage year. We received payments of $521 million for reinsurance recoverables, $57 million for risk adjustment settlements, and $26 million for risk corridor settlements associated with the 2014 coverage year during the year ended December 31, 2015. We expect to collect the remaining risk adjustment receivable for the 2014 coverage year of approximately $4 million in 2016.

During 2015, we received our interim settlement associated with our risk corridor receivables for the 2014 coverage year. The interim settlement, representing only 12.6% of risk corridor receivables for the 2014 coverage year, was funded by HHS in accordance with previous guidance, utilizing funds HHS collected from us and other carriers under the 2014 risk corridor program. As discussed in Note 2, HHS provided guidance under the three year risk corridor program that future collections will first be applied to any shortfalls from previous coverage years before application

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to current year obligations. Risk corridor payables to issuers are obligations of the United States Government under the Health Care Reform law which requires the Secretary of HHS to make full payments to issuers. In the event of a shortfall at the end of the three year program, HHS has asserted it will explore other sources of funding for risk corridor payments, subject to the availability of appropriations. Based on the notice from CMS and collections in the fourth quarter of 2015, we classified our remaining gross risk corridor receivables for both the 2014 and 2015 coverage years as long-term because settlement is expected to exceed 12 months at December 31, 2015.

The accompanying consolidated balance sheets include the following amounts associated with the 3Rs at December 31, 2015 and December 31, 2014. Amounts classified as long-term represent settlements that we expect to exceed 12 months at December 31, 2015.

	2015							2014
	Risk Adjustment Settlement			Reinsurance Recoverables		Risk Corridor Settlement		Risk Adjustment Settlement			Reinsurance Recoverables		Risk Corridor Settlement
	(in millions)
2014 Coverage Year
Premiums receivable	$	4		$	—	$	—	$	131		$	—	$	—
Other current assets	—			—		—		—			586		55
Trade accounts payable and accrued expenses	—			—		—		(89		)	—		(4		)
Net current asset	4			—		—		42			586		51
Other long-term assets	—			—		215		—			—		—
Other long-term liabilities	—			—		—		—			—		—
Net long-term asset	—			—		215		—			—		—
Total 2014 coverage year net asset	4			—		215		42			586		51
2015 Coverage Year
Premiums receivable	122			—		—		—			—		—
Other current assets	—			610		—		—			—		—
Trade accounts payable and accrued expenses	(223		)	—		—		—			—		—
Net current (liability) asset	(101		)	610		—		—			—		—
Other long-term assets	10			—		244		—			—		—
Other long-term liabilities	—			—		—		—			—		—
Net long-term asset	10			—		244		—			—		—
Total 2015 coverage year net (liability) asset	(91		)	610		244		—			—		—
Total net (liability) asset	$	(87	)	$	610	$	459	$	42		$	586	$	51

In 2015, we paid the federal government $867 million for the annual health insurance industry fee attributed to calendar year 2015, in accordance with the Health Care Reform Law. In 2014, we paid the federal government $562 million for the annual health insurance industry fee attributed to calendar year 2014. This fee is not deductible for tax purposes.

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8. PROPERTY AND EQUIPMENT, NET

Property and equipment was comprised of the following at December 31, 2015 and 2014, excluding Concentra amounts classified as held-for-sale at December 31, 2014 for comparative purposes. Net property and equipment associated with Concentra and classified as held-for sale at December 31, 2014 was $191 million.

	2015			2014
	(in millions)
Land	$	20		$	18
Buildings and leasehold improvements	633			602
Equipment	645			631
Computer software	1,424			1,656
	2,722			2,907
Accumulated depreciation	(1,338		)	(1,679		)
Property and equipment, net	$	1,384		$	1,228

Depreciation expense was $354 million in 2015, $328 million in 2014, and $309 million in 2013, including amortization expense for capitalized internally developed and purchased software of $220 million in 2015, $191 million in 2014, and $172 million in 2013.

9. GOODWILL AND OTHER INTANGIBLE ASSETS

The carrying amounts of goodwill for our reportable segments have been retrospectively adjusted as of January 1, 2014 to conform to the 2015 segment change discussed in Note 2. Changes in the carrying amount of goodwill for our reportable segments for the years ended December 31, 2015 and 2014 were as follows:

	Retail		Group		Healthcare Services			Total
	(in millions)
Balance at January 1, 2014	$	1,069	$	385	$	1,799		$	3,253
Acquisitions	—		—		19			19
Dispositions	—		—		(40		)	(40		)
Subsequent payments/adjustments	—		—		(1		)	(1		)
Balance at December 31, 2014	1,069		385		1,777			3,231
Acquisitions	—		—		35			35
Dispositions	—		—		(1		)	(1		)
Balance at December 31, 2015	$	1,069	$	385	$	1,811		$	3,265

Healthcare Services segment goodwill of $480 million associated with the sale of Concentra was reclassified to assets held-for-sale as of January 1, 2014 for comparative purposes and excluded from the table above. This $480 million of goodwill was disposed of on June 1, 2015 with the completion of the sale of Concentra.

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The following table presents details of our other intangible assets included in other long-term assets in the accompanying consolidated balance sheets at December 31, 2015 and 2014 and excludes Concentra amounts classified as held-for-sale as of December 31, 2014 for comparative purposes. Net other intangible assets associated with Concentra and classified as held-for-sale at December 31, 2014 were $132 million.

	Weighted Average Life	2015						2014
		Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
		(in millions)
Other intangible assets:
Customer contracts/relationships	9.8 years	$	566	$	292	$	274	$	657	$	326	$	331
Trade names and technology	8.3 years	104		54		50		115		50		65
Provider contracts	14.6 years	51		24		27		52		21		31
Noncompetes and other	8.2 years	32		26		6		41		28		13
Total other intangible assets	9.8 years	$	753	$	396	$	357	$	865	$	425	$	440

Amortization expense for other intangible assets was approximately $93 million in 2015, $121 million in 2014, and $117 million in 2013. The following table presents our estimate of amortization expense for each of the five next succeeding fiscal years:

	(in millions)
For the years ending December 31,:
2016	$	78
2017	71
2018	62
2019	51
2020	47

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10. BENEFITS PAYABLE

Activity in benefits payable, excluding military services, was as follows for the years ended December 31, 2015, 2014 and 2013:

	2015			2014			2013
	(in millions)
Balances at January 1	$	4,475		$	3,893		$	3,775
Less: Reinsurance recoverables	(78		)	—			—
Balances at January 1, net	4,397			3,893			3,775
Acquisitions	—			—			5
Incurred related to:
Current year	44,397			38,641			32,711
Prior years	(236		)	(518		)	(474		)
Total incurred	44,161			38,123			32,237
Paid related to:
Current year	(39,802		)	(34,357		)	(29,103		)
Prior years	(4,041		)	(3,262		)	(3,021		)
Total paid	(43,843		)	(37,619		)	(32,124		)
Premium deficiency reserve	176			—			—
Reinsurance recoverable	85			78			—
Balances at December 31	$	4,976		$	4,475		$	3,893

Amounts incurred related to prior years vary from previously estimated liabilities as the claims ultimately are settled. Negative amounts reported for incurred related to prior years result from claims being ultimately settled for amounts less than originally estimated (favorable development).

Actuarial standards require the use of assumptions based on moderately adverse experience, which generally results in favorable reserve development, or reserves that are considered redundant. We experienced favorable medical claims reserve development related to prior fiscal years of $236 million in 2015, $518 million in 2014, and $474 million in 2013. The favorable medical claims reserve development for 2015, 2014, and 2013 primarily reflects the consistent application of trend and completion factors estimated using an assumption of moderately adverse conditions. The decline in favorable prior period development in 2015 primarily was due to the impact of lower financial claim recoveries due in part to our gradual implementation during 2014 of inpatient authorization review prior to admission as opposed to post adjudication, as well as higher than expected flu associated claims from the fourth quarter of 2014 and continued volatility in claims associated with individual commercial medical products. The higher favorable prior period development during 2014 and 2013 resulted from increased membership, better than originally expected utilization across most of our major business lines and increased financial recoveries. The increase in financial recoveries primarily resulted from claim audit process enhancements as well as increased volume of claim audits and expanded audit scope. All lines of business benefited from these improvements.

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Benefits expense excluded from the previous table was as follows for the years ended December 31, 2015, 2014 and 2013:

	2015			2014		2013
	(in millions)
Premium deficiency reserve for short-duration policies	$	176		$	—	$	—
Military services	12			11		(27		)
Future policy benefits	(80		)	32		354
Total	$	108		$	43	$	327

In the fourth quarter of 2015, we recognized a premium deficiency reserve for our individual commercial medical business compliant with the Health Care Reform Law associated with the 2016 coverage year as discussed in more detail in Note 7.

Military services benefits expense for 2015 and 2014 reflect expenses associated with our contracts with the Veterans Administration. Military services benefits expense for 2013 reflects the beneficial effect of a favorable settlement of contract claims with the DoD partially offset by expenses associated with our contracts with the Veterans Administration.

The decrease in benefits expense associated with future policy benefits payable in 2015 primarily reflects the release of reserves as individual commercial medical members transitioned to plans compliant with the Health Care Reform Law. The higher benefits expense associated with future policy benefits payable during 2013 relates to reserve strengthening for our closed block of long-term care insurance policies acquired in connection with the 2007 KMG America Corporation, or KMG, acquisition more fully described in Note 18.

11. INCOME TAXES

The provision for income taxes consisted of the following for the years ended December 31, 2015, 2014 and 2013:

	2015			2014			2013
	(in millions)
Current provision:
Federal	$	1,067		$	1,006		$	595
States and Puerto Rico	90			81			53
Total current provision	1,157			1,087			648
Deferred (benefit) provision	(2		)	(64		)	42
Provision for income taxes	$	1,155		$	1,023		$	690

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The provision for income taxes was different from the amount computed using the federal statutory rate for the years ended December 31, 2015, 2014 and 2013 due to the following:

	2015			2014			2013
	(in millions)
Income tax provision at federal statutory rate	$	851		$	759		$	672
States, net of federal benefit, and Puerto Rico	44			48			32
Tax exempt investment income	(24		)	(27		)	(26		)
Health insurer fee	314			204			—
Nondeductible executive compensation	18			22			6
Concentra sale	(67		)	—			—
Other, net	19			17			6
Provision for income taxes	$	1,155		$	1,023		$	690

The provision for income taxes for 2015, 2014, and 2013 reflects an $18 million, $22 million, and $6 million, respectively, estimated impact from limitations on the deductibility of annual compensation in excess of $500,000 per employee as mandated by the Health Care Reform Law. As of December 31, 2015, we do not have material uncertain tax positions reflected in our consolidated balance sheet.

Deferred income tax balances reflect the impact of temporary differences between the tax bases of assets or liabilities and their reported amounts in our consolidated financial statements, and are stated at enacted tax rates expected to be in effect when the reported amounts are actually recovered or settled. Principal components of our net deferred tax balances at December 31, 2015 and 2014 were as follows, excluding Concentra amounts classified as held-for-sale at December 31, 2014 for comparative purposes. The net deferred tax liability associated with Concentra and classified as held-for sale at December 31, 2014 was $55 million.

	Assets (Liabilities)
	2015			2014
	(in millions)
Future policy benefits payable	$	200		$	320
Compensation and other accrued expenses	130			168
Benefits payable	267			138
Net operating loss carryforward	47			52
Deferred acquisition costs	64			57
Unearned revenues	22			21
Other	13			17
Total deferred income tax assets	743			773
Valuation allowance	(42		)	(48		)
Total deferred income tax assets, net of valuation allowance	701			725
Depreciable property and intangible assets	(363		)	(346		)
Investment securities	(37		)	(168		)
Prepaid expenses	(45		)	(55		)
Total deferred income tax liabilities	(445		)	(569		)
Total net deferred income tax assets	$	256		$	156
Amounts recognized in the consolidated balance sheets:
Other current assets	$	—		$	79
Other long-term assets	256			77
Total net deferred income tax assets	$	256		$	156

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In November 2015, the FASB issued new guidance related to accounting for income taxes which changes the balance sheet classification of deferred taxes, requiring deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position.We elected to early adopt the guidance and have classified all deferred tax liabilities and assets as noncurrent in our consolidated balance sheet at December 31, 2015 to simplify their presentation. Prior periods were not retrospectively adjusted. If we had retrospectively adjusted our consolidated balance sheet, our other current assets would have declined by $79 million and, similarly, our other long-term assets would have increased by $79 million at December 31, 2014.

At December 31, 2015, we had approximately $126 million of net operating losses to carry forward related to prior acquisitions and our Puerto Rico subsidiaries. These net operating loss carryforwards, if not used to offset future taxable income, will expire from 2016 through 2033. Due to limitations and uncertainty regarding our ability to use some of the carryforwards, a valuation allowance was established on $105 million of these net operating loss carryforwards and $7 million of other items related to Puerto Rico. For the remainder of the net operating loss carryforwards and other cumulative temporary differences, based on our historical record of producing taxable income and profitability, we have concluded that future operating income will be sufficient to give rise to tax expense to recover all deferred tax assets.

We provide for income taxes on the undistributed earnings of our Puerto Rico operations using that jurisdiction’s tax rate, which has been lower historically than the U.S. statutory tax rate. Permanent investment of these earnings has resulted in cumulative unrecognized deferred tax liabilities of approximately $30 million as of December 31, 2015.

We file income tax returns in the United States and certain foreign jurisdictions. The U.S. Internal Revenue Service, or IRS, has completed its examinations of our consolidated income tax returns for 2013 and prior years. Our 2014 tax return is in the post-filing review period under the Compliance Assurance Process (CAP). Our 2015 tax return is under advance review by the IRS under CAP. With few exceptions, which are immaterial in the aggregate, we no longer are subject to state, local and foreign tax examinations for years before 2012. As of December 31, 2015, we are not aware of any material adjustments that may be proposed.

12. DEBT

The carrying value of long-term debt outstanding was as follows at December 31, 2015 and 2014:

	2015		2014
	(in millions)
Long-term debt:
Senior notes:
$500 million, 7.20% due June 15, 2018	$	503	$	504
$300 million, 6.30% due August 1, 2018	309		312
$400 million, 2.625% due October 1, 2019	400		400
$600 million, 3.15% due December 1, 2022	598		598
$600 million, 3.85% due October 1, 2024	599		599
$250 million, 8.15% due June 15, 2038	266		266
$400 million, 4.625% due December 1, 2042	400		400
$750 million, 4.95% due October 1, 2044	746		746
Total long-term debt	$	3,821	$	3,825

Senior Notes

In September 2014, we issued $400 million of 2.625% senior notes due October 1, 2019, $600 million of 3.85% senior notes due October 1, 2024 and $750 million of 4.95% senior notes due October 1, 2044. Our net proceeds, reduced for the underwriters' discount and commission and offering expenses, were $1.73 billion. We used a portion of the net proceeds to redeem the $500 million 6.45% senior unsecured notes as discussed below.

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In October 2014, we redeemed the $500 million 6.45% senior unsecured notes due June 1, 2016, at 100%of the principal amount plus applicable premium for early redemption and accrued and unpaid interest to the redemption date, for cash totaling approximately $560 million. We recognized a loss on extinguishment of debt of approximately $37 million in October 2014 for the redemption of these notes.

Our senior notes, which are unsecured, may be redeemed at our option at any time at 100% of the principal amount plus accrued interest and a specified make-whole amount. The 7.20% and 8.15% senior notes are subject to an interest rate adjustment if the debt ratings assigned to the notes are downgraded (or subsequently upgraded). In addition, our senior notes (other than the 6.30% senior notes) contain a change of control provision that may require us to purchase the notes under certain circumstances. On July 2, 2015 we entered into a Merger Agreement with Aetna that, when closed, may require redemption of the notes if the notes are downgraded below investment grade by both Standard & Poor’s Rating Services, or S&P and Moody’s Investors Services, Inc., or Moody’s.

Prior to 2009, we were parties to interest-rate swap agreements that exchanged the fixed interest rate under our senior notes for a variable interest rate based on LIBOR. As a result, the carrying value of the senior notes was adjusted to reflect changes in value caused by an increase or decrease in interest rates. During 2008, we terminated all of our swap agreements. The cumulative adjustment to the carrying value of our senior notes was $103 million as of the termination date which is being amortized as a reduction to interest expense over the remaining term of the senior notes. In October 2014, the redemption of our 6.45% senior notes reduced the unamortized carrying value adjustment by $12 million. The unamortized carrying value adjustment was $28 million as of December 31, 2015 and $32 million as of December 31, 2014.

Credit Agreement

Our5-year$1.0 billionunsecured revolving credit agreement expires July 2018. Under the credit agreement, at our option, we can borrow on either a competitive advance basis or a revolving credit basis. The revolving credit portion bears interest at either LIBOR plus a spread or the base rate plus a spread. The LIBOR spread, currently110basis points, varies depending on our credit ratings ranging from 90 to 150basis points. We also pay an annual facility fee regardless of utilization. This facility fee, currently15basis points, may fluctuate between10 and 25basis points, depending upon our credit ratings. The competitive advance portion of any borrowings will bear interest at market rates prevailing at the time of borrowing on either a fixed rate or a floating rate based on LIBOR, at our option.

The terms of the credit agreement include standard provisions related to conditions of borrowing, including a customary material adverse effect clause which could limit our ability to borrow additional funds. In addition, the credit agreement contains customary restrictive and financial covenants as well as customary events of default, including financial covenants regarding the maintenance of a minimum level of net worth of $8.5 billionat December 31, 2015and a maximum leverage ratio of 3.0:1. We are in compliance with the financial covenants, with actual net worth of$10.3 billionand an actual leverage ratio of 1.3:1, as measured in accordance with the credit agreement as of December 31,2015. In addition, the credit agreement includes an uncommitted $250 million incremental loan facility.

At December 31, 2015, we had no borrowings outstanding under the credit agreement and we had outstanding letters of credit of $1 million secured under the credit agreement. No amounts have been drawn on these letters of credit. Accordingly, as of December 31, 2015, we had $999 million of remaining borrowing capacity under the credit agreement, none of which would be restricted by our financial covenant compliance requirement. We have other customary, arms-length relationships, including financial advisory and banking, with some parties to the credit agreement.

Commercial Paper

In October 2014, we entered into a commercial paper program pursuant to which we may issue short-term, unsecured commercial paper notes privately placed on a discount basis through certain broker dealers. Amounts available under the program may be borrowed, repaid and re-borrowed from time to time, with the aggregate face or principal amount outstanding under the program at any time not to exceed $1 billion. The net proceeds of issuances have been and are expected to be used for general corporate purposes. The maximum principal amount outstanding at any one time during

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the year endedDecember 31, 2015 was $414 million, with $299 million outstanding at December 31, 2015. There were no outstanding borrowings at December 31, 2014.

13. EMPLOYEE BENEFIT PLANS

Employee Savings Plan

We have defined contribution retirement savings plans covering eligible employees which include matching contributions based on the amount of our employees’ contributions to the plans. The cost of these plans amounted to approximately $188 million in 2015, $176 million in 2014, and $155 million in 2013. The Company’s cash match is invested pursuant to the participant’s contribution direction. Based on the closing price of our common stock of $178.51 on December 31, 2015, approximately 13% of the retirement and savings plan’s assets were invested in our common stock, or approximately 2.5 million shares, representing 2% of the shares outstanding as of December 31, 2015. At December 31, 2015, approximately 3.4 million shares of our common stock were reserved for issuance under our defined contribution retirement savings plans.

Stock-Based Compensation

We have plans under which options to purchase our common stock and restricted stock units have been granted to executive officers, directors and key employees. For awards granted prior to July 2, 2015, our equity award agreements generally contain provisions whereby the awards automatically accelerate and vest upon change in control, including those granted to retirement-eligible participants described below. The Merger discussed in Note 2 qualifies as a change in control event under our equity award agreements. Awards granted on or after July 2, 2015 would generally require both a change in control and termination of employment within 2 years of the date of the change in control to accelerate the vesting, including those granted to retirement-eligible participants.

The terms and vesting schedules for stock-based awards vary by type of grant. Generally, the awards vest upon time-based conditions. We have also granted awards to certain employees that vest upon a combination of time and performance-based conditions. The stock awards of retirement-eligible participants granted prior to July 2, 2015 generally will continue to fully vest on the originally scheduled vest date upon retirement from the Company. For stock awards of retirement-eligible employees granted on or after July 2, 2015, awards are generally earned ratably over the service period for each tranche. Accordingly, upon retirement the earned portion of the current tranche will continue to vest on the originally scheduled vest date and any remaining unearned portion of the award will be forfeited. Our equity award program includes a retirement provision that generally treats employees with a combination of age and years of services with the Company totaling 65 or greater, with a minimum required age of 55 and a minimum requirement of 5 years of service, as retirement-eligible. Upon exercise, stock-based compensation awards are settled with authorized but unissued company stock or treasury stock.

The compensation expense that has been charged against income for these plans was as follows for the years ended December 31,2015, 2014, and 2013:

	2015			2014			2013
	(in millions)
Stock-based compensation expense by type:
Restricted stock	$	99		$	91		$	84
Stock options	10			7			8
Total stock-based compensation expense	109			98			92
Tax benefit recognized	(26		)	(22		)	(22		)
Stock-based compensation expense, net of tax	$	83		$	76		$	70

The tax benefit recognized in our consolidated financial statements is based on the amount of compensation expense recorded for book purposes, subject to limitations on the deductibility of annual compensation in excess of $500,000 per employee as mandated by the Health Care Reform Law. The actual tax benefit realized in our tax return is based

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on the intrinsic value, or the excess of the market value over the exercise or purchase price, of stock options exercised and restricted stock vested during the period, subject to limitations on the deductibility of annual compensation in excess of $500,000 per employee as mandated by the Health Care Reform Law. The actual tax benefit realized for the deductions taken on our tax returns from option exercises and restricted stock vesting totaled $34 million in 2015, $30 million in 2014, and $20 million in 2013. There was no capitalized stock-based compensation expense during these years.

At December 31, 2015, there were 18.1 million shares reserved for stock award plans. These reserved shares included giving effect to, under the 2011 Plan, 8.7 million shares of common stock available for future grants assuming all stock options were granted or 3.8 million shares available for future grants assuming all restricted stock were granted. Shares may be issued from authorized but unissued company stock or treasury stock.

Restricted Stock

Restricted stock is granted with a fair value equal to the market price of our common stock on the date of grant and generally vests three years from the date of grant. Restricted stock granted on or after July 2, 2015, generally vests in equal annual tranches over a three year period from the date of grant. Certain of our restricted stock units also include performance-based conditions generally associated with strategic membership growth and return on invested capital. Restricted stock units have forfeitable dividend equivalent rights equal to the dividend paid on common stock. The weighted-average grant date fair value of our restricted stock was $165.26 in 2015, $103.57 in 2014, and $73.50 in 2013. Activity for our restricted stock was as follows for the year ended December 31, 2015:

	Shares		Weighted- Average Grant-Date Fair Value
	(shares in thousands)
Nonvested restricted stock at December 31, 2014	3,635		$	85.52
Granted	837		165.26
Vested	(919	)	84.95
Forfeited	(188	)	98.92
Nonvested restricted stock at December 31, 2015	3,365		$	104.58

Approximately 30% of the nonvested restricted stock at December 31, 2015 included performance-based conditions.

The fair value of shares vested was $153 million during 2015, $99 million during 2014, and $52 million during 2013. Total compensation expense not yet recognized related to nonvested restricted stock was $88 million at December 31, 2015. We expect to recognize this compensation expense over a weighted-average period of approximately 1.4 years. There are no other contractual terms covering restricted stock once vested.

Stock Options

Stock options are granted with an exercise price equal to the fair market value of the underlying common stock on the date of grant. Our stock plans, as approved by the Board of Directors and stockholders, define fair market value as the average of the highest and lowest stock prices reported on the composite tape by the New York Stock Exchange on a given date. Exercise provisions vary, but most options vest in whole or in part 1 to 3 years after grant and expire 7 years after grant.

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The weighted-average fair value of each option granted during 2015, 2014, and 2013 is provided below. The fair value was estimated on the date of grant using the Black-Scholes pricing model with the weighted-average assumptions indicated below:

	2015			2014			2013
Weighted-average fair value at grant date	$	36.91		$	22.45		$	21.80
Expected option life (years)	4.2 years			4.3 years			4.4 years
Expected volatility	27.4		%	27.6		%	38.8		%
Risk-free interest rate at grant date	1.4		%	1.3		%	0.8		%
Dividend yield	0.7		%	1.1		%	1.5		%

When valuing employee stock options, we stratify the employee population into three homogenous groups that historically have exhibited similar exercise behaviors. These groups are executive officers, directors, and all other employees. We value the stock options based on the unique assumptions for each of these employee groups.

We calculate the expected term for our employee stock options based on historical employee exercise behavior and base the risk-free interest rate on a traded zero-coupon U.S. Treasury bond with a term substantially equal to the option’s expected term.

The volatility used to value employee stock options is based on historical volatility. We calculate historical volatility using a simple-average calculation methodology based on daily price intervals as measured over the expected term of the option.

Activity for our option plans was as follows for the year ended December 31, 2015:

	Shares  Under Option		Weighted-Average Exercise Price
	(shares in thousands)
Options outstanding at December 31, 2014	768		$	82.45
Granted	377		164.80
Exercised	(304	)	76.25
Forfeited	(6	)	83.58
Options outstanding at December 31, 2015	835		$	121.89
Options exercisable at December 31, 2015	203		$	78.30

As of December 31, 2015, outstanding stock options, substantially all of which are expected to vest, had an aggregate intrinsic value of $48 million, and a weighted-average remaining contractual term of 5.0 years. As of December 31, 2015, exercisable stock options had an aggregate intrinsic value of $20 million, and a weighted-average remaining contractual term of 3.5 years. The total intrinsic value of stock options exercised during 2015 was $28 million, compared with $32 million during 2014 and $39 million during 2013. Cash received from stock option exercises totaled $23 million in 2015, $52 million in 2014, and $67 million in 2013.

Total compensation expense not yet recognized related to nonvested options was $10 million at December 31, 2015. We expect to recognize this compensation expense over a weighted-average period of approximately 1.9 years.

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14. EARNINGS PER COMMON SHARE COMPUTATION

Detail supporting the computation of basic and diluted earnings per common share was as follows for the years ended December 31, 2015, 2014 and 2013:

	2015		2014		2013
	(dollars in millions, except per common share results, number of shares/options in thousands)
Net income available for common stockholders	$	1,276	$	1,147	$	1,231
Weighted-average outstanding shares of common stock used to compute basic earnings per common share	149,455		154,187		157,503
Dilutive effect of:
Employee stock options	192		230		322
Restricted stock	1,495		1,457		1,326
Shares used to compute diluted earnings per common share	151,142		155,874		159,151
Basic earnings per common share	$	8.54	$	7.44	$	7.81
Diluted earnings per common share	$	8.44	$	7.36	$	7.73
Number of antidilutive stock options and restricted stock awards excluded from computation	415		320		704

15. STOCKHOLDERS’ EQUITY

Dividends

The following table provides details of dividend payments, excluding dividend equivalent rights, in 2013, 2014, and 2015 under our Board approved quarterly cash dividend policy:

Payment Date	Amount per Share	Total Amount
		(in millions)
2013	$1.06	$167
2014	$1.10	$170
2015	$1.14	$170

The Merger Agreement discussed in Note 2 does not impact our ability and intent to continue quarterly dividend payments prior to the closing of the Merger consistent with our historical dividend payments. Under the terms of the Merger Agreement, we have agreed with Aetna that our quarterly dividend will not exceed $0.29 per share prior to the closing of the Merger. Declaration and payment of future quarterly dividends is at the discretion of our Board and may be adjusted as business needs or market conditions change. In addition, under the terms of the Merger Agreement, we have agreed with Aetna to coordinate the declaration and payment of dividends so that our stockholders do not fail to receive a quarterly dividend around the time of the closing of the Merger.

On October 29, 2015, the Board declared a cash dividend of $0.29 per share that was paid on January 29, 2016 to stockholders of record on December 30, 2015, for an aggregate amount of $43 million.

Stock Repurchases

In September 2014, our Board of Directors replaced a previous share repurchase authorization of up to $1 billion (of which $816 million remained unused) with a new current authorization for repurchases of up to $2 billion of our common shares exclusive of shares repurchased in connection with employee stock plans, expiring on December 31, 2016. Under the share repurchase authorization, shares may be purchased from time to time at prevailing prices in the

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open market, by block purchases, through plans designed to comply with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended, or in privately-negotiated transactions (including pursuant to accelerated share repurchase agreements with investment banks), subject to certain regulatory restrictions on volume, pricing, and timing. Pursuant to the Merger Agreement, after July 2, 2015, we are prohibited from repurchasing any of our outstanding securities without the prior written consent of Aetna, other than repurchases of shares of our common stock in connection with the exercise of outstanding stock options or the vesting or settlement of outstanding restricted stock awards. Accordingly, as announced on July 3, 2015, we have suspended our share repurchase program. Our remaining repurchase authorization was$1.04 billion as of July 3, 2015.

Excluding shares acquired in connection with employee stock plans as well as 0.36 million shares received in March 2015 upon final settlement of our accelerated share repurchase agreement, or ASR Agreement, described below for which no cash was paid during the period, share repurchases were as follows during the years ended December 31, 2015, 2014 and 2013:

			Year Ended December 31,
			2015			2014				2013
Authorization Date	Purchase Not to Exceed		Shares	Cost		Shares	Cost			Shares	Cost
	(in millions)
September 2014	$	2,000	1.85	$	329	4.10	$	635	(a)	—	$	—
April 2014	1,000		—	—		1.50	184			—	—
April 2013	1,000		—	—		0.10	11			4.55	420
April 2012	1,000		—	—		—	—			1.22	82
Total repurchases			1.85	$	329	5.70	$	830		5.77	$	502

(a) Includes $100 millionheld back by Goldman Sachs pending final settlement of the ASR

Agreement in March 2015 at which time we received an additional 0.36 million shares which

are excluded from the table above.

On November 7, 2014, we announced that we had entered into an accelerated share repurchase agreement, or ASR Agreement, with Goldman, Sachs & Co., or Goldman Sachs, to repurchase $500 million of our common stock as part of the $2 billion share repurchase program authorized in September 2014. Under the ASR Agreement, on November 10, 2014, we made a payment of $500 million to Goldman Sachs from available cash on hand and received an initial delivery of 3.06 million shares of our common stock from Goldman Sachs based on the then current market price of Humana common stock.  The payment to Goldman Sachs was recorded as a reduction to stockholders’ equity, consisting of a$400 million increase in treasury stock, which reflected the value of the initial 3.06 million shares received upon initial settlement, and a $100 million decrease in capital in excess of par value, which reflected the value of stock held back by Goldman Sachs pending final settlement of the ASR Agreement. Upon settlement of the ASR on March 13, 2015, we received an additional 0.36 million shares as determined by the average daily volume weighted-average share price of our common stock during the term of the ASR Agreement of $146.21,bringing the total shares received under this program to3.42 million. In addition, upon settlement we reclassified the $100 million value of stock initially held back by Goldman Sachs from capital in excess of par value to treasury stock.

In connection with employee stock plans, we acquired 0.3 million common shares for $56 million in 2015, 0.4 million common shares for $42 million in 2014, and 0.3 million common shares for $29 million in 2013.

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Regulatory Requirements

Certain of our subsidiaries operate in states that regulate the payment of dividends, loans, or other cash transfers to Humana Inc., our parent company, and require minimum levels of equity as well as limit investments to approved securities. The amount of dividends that may be paid to Humana Inc. by these subsidiaries, without prior approval by state regulatory authorities, or ordinary dividends, is limited based on the entity’s level of statutory income and statutory capital and surplus. In most states, prior notification is provided before paying a dividend even if approval is not required.

Although minimum required levels of equity are largely based on premium volume, product mix, and the quality of assets held, minimum requirements vary significantly at the state level. Our state regulated insurances subsidiaries had aggregate statutory capital and surplus of approximately$6.6 billion and $6.0 billion as of December 31, 2015 and 2014, respectively, which exceeded aggregate minimum regulatory requirements of$4.6 billion and $4.1 billion, respectively. Subsidiary dividends are subject to state regulatory approval, the amount and timing of which could be reduced or delayed. Excluding Puerto Rico subsidiaries, the amount of ordinary dividends that may be paid to our parent company in2016is approximately$900 millionin the aggregate. This compares to dividends that were paid to our parent company in2015of approximately$493 million. Actual dividends paid may vary due to consideration of excess statutory capital and surplus and expected future surplus requirements related to, for example, premium volume and product mix.

16. COMMITMENTS, GUARANTEES AND CONTINGENCIES

Leases

We lease facilities, computer hardware, and other furniture and equipment under long-term operating leases that are noncancelable and expire on various dates through 2026. We sublease facilities or partial facilities to third party tenants for space not used in our operations. Rent with scheduled escalation terms are accounted for on a straight-line basis over the lease term. Rent expense and sublease rental income, which are recorded net as an operating cost, for all operating leases were as follows for the years ended December 31, 2015, 2014 and 2013:

	2015			2014			2013
	(in millions)
Rent expense	$	201		$	226		$	227
Sublease rental income	(25		)	(14		)	(11		)
Net rent expense	$	176		$	212		$	216

Future annual minimum payments due subsequent to December 31, 2015 under all of our noncancelable operating leases with initial terms in excess of one year are as follows:

	Minimum Lease Payments		Sublease Rental Receipts			Net  Lease Commitments
	(in millions)
For the years ending December 31,:
2016	$	173	$	(16	)	$	157
2017	159		(16		)	143
2018	127		(14		)	113
2019	94		(11		)	83
2020	54		(7		)	47
Thereafter	90		(45		)	45
Total	$	697	$	(109	)	$	588

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Purchase Obligations

We have agreements to purchase services, primarily information technology related services, or to make improvements to real estate, in each case that are enforceable and legally binding on us and that specify all significant terms, including: fixed or minimum levels of service to be purchased; fixed, minimum or variable price provisions; and the appropriate timing of the transaction. We have purchase obligation commitments of $74 million in 2016, $44 million in 2017, $30 million in 2018, $1 million in 2019, and $1 million thereafter. Purchase obligations exclude agreements that are cancelable without penalty.

Off-Balance Sheet Arrangements

As part of our ongoing business, we do not participate or knowingly seek to participate in transactions that generate relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities, or SPEs, which would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. As of December 31, 2015, we were not involved in any SPE transactions.

Guarantees and Indemnifications

Through indemnity agreements approved by the state regulatory authorities, certain of our regulated subsidiaries generally are guaranteed by Humana Inc., our parent company, in the event of insolvency for (1) member coverage for which premium payment has been made prior to insolvency; (2) benefits for members then hospitalized until discharged; and (3) payment to providers for services rendered prior to insolvency. Our parent also has guaranteed the obligations of our military services subsidiaries.

In the ordinary course of business, we enter into contractual arrangements under which we may agree to indemnify a third party to such arrangement from any losses incurred relating to the services they perform on behalf of us, or for losses arising from certain events as defined within the particular contract, which may include, for example, litigation or claims relating to past performance. Such indemnification obligations may not be subject to maximum loss clauses. Historically, payments made related to these indemnifications have been immaterial.

Government Contracts

Our Medicare products, which accounted for approximately 72% of our total premiums and services revenue for the year ended December 31, 2015, primarily consisted of products covered under the Medicare Advantage and Medicare Part D Prescription Drug Plan contracts with the federal government. These contracts are renewed generally for a calendar year term unless CMS notifies us of its decision not to renew by May 1 of the calendar year in which the contract would end, or we notify CMS of our decision not to renew by the first Monday in June of the calendar year in which the contract would end. All material contracts between Humana and CMS relating to our Medicare products have been renewed for 2016, and all of our product offerings filed with CMS for 2016 have been approved.

CMS uses a risk-adjustment model which apportions premiums paid to Medicare Advantage, or MA, plans according to health severity of covered members. The risk-adjustment model pays more for enrollees with predictably higher costs. Under this model, rates paid to MA plans are based on actuarially determined bids, which include a process whereby our prospective payments are based on a comparison of our beneficiaries’ risk scores, derived from medical diagnoses, to those enrolled in the government’s traditional fee-for-service Medicare program (referred to as "Medicare FFS"). Under the risk-adjustment methodology, all MA plans must collect and submit the necessary diagnosis code information from hospital inpatient, hospital outpatient, and physician providers to CMS within prescribed deadlines. The CMS risk-adjustment model uses the diagnosis data to calculate the risk-adjusted premium payment to MA plans, which CMS adjusts for coding pattern differences between the health plans and the government fee-for-service program. We generally rely on providers, including certain providers in our network who are our employees, to code their claim submissions with appropriate diagnoses, which we send to CMS as the basis for our payment received from CMS under the actuarial risk-adjustment model. We also rely on these providers to document appropriately all medical data, including the diagnosis data submitted with claims. In addition, we conduct medical record reviews as part of our data

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and payment accuracy compliance efforts, to more accurately reflect diagnosis conditions under the risk adjustment model. These compliance efforts include the internal contract level audits described in more detail below.

CMS is continuing to perform audits of various companies’ selected MA contracts related to this risk adjustment diagnosis data. We refer to these audits as Risk-Adjustment Data Validation Audits, or RADV audits. RADV audits review medical records in an attempt to validate provider medical record documentation and coding practices which influence the calculation of premium payments to MA plans.

In 2012, CMS released a “Notice of Final Payment Error Calculation Methodology for Part C Medicare Advantage Risk Adjustment Data Validation (RADV) Contract-Level Audits.” The payment error calculation methodology provides that, in calculating the economic impact of audit results for an MA contract, if any, the results of the audit sample will be extrapolated to the entire MA contract based upon a comparison to “benchmark” audit data in Medicare FFS (which we refer to as the "FFS Adjuster"). This comparison to the FFS Adjuster is necessary to determine the economic impact, if any, of audit results because the government program data set, including any attendant errors that are present in that data set, provides the basis for MA plans’ risk adjustment to payment rates. CMS already makes other adjustments to payment rates based on a comparison of coding pattern differences between MA plans and Medicare FFS data (such as for frequency of coding for certain diagnoses in MA plan data versus the government program data set).

The final methodology, including the first application of extrapolated audit results to determine audit settlements, is expected to be applied to RADV contract level audits currently being conducted for contract year 2011 in which two of our Medicare Advantage plans are being audited. Per CMS guidance, selected MA contracts will be notified of an audit at some point after the close of the final reconciliation for the payment year being audited. The final reconciliation occurs in August of the calendar year following the payment year. We were notified on September 15, 2015, that five of our Medicare Advantage contracts have been selected for audit for contract year 2012.

Estimated audit settlements are recorded as a reduction of premiums revenue in our consolidated statements of income, based upon available information. We perform internal contract level audits based on the RADV audit methodology prescribed by CMS. Included in these internal contract level audits is an audit of our Private Fee-For-Service business which we used to represent a proxy of the FFS Adjuster which has not yet been released. We based our accrual of estimated audit settlements for each contract year on the results of these internal contract level audits and update our estimates as each audit is completed. Estimates derived from these results were not material to our results of operations, financial position, or cash flows. However, as indicated, we are awaiting additional guidance from CMS regarding the FFS Adjuster. Accordingly, we cannot determine whether such RADV audits will have a material adverse effect on our results of operations, financial position, or cash flows.

In addition, CMS' comments in formalized guidance regarding “overpayments” to MA plans appear to be inconsistent with CMS' prior RADV audit guidance. These statements, contained in the preamble to CMS’ final rule release regarding Medicare Advantage and Part D prescription drug benefit program regulations for Contract Year 2015, appear to equate each Medicare Advantage risk adjustment data error with an “overpayment” without reconciliation to the principles underlying the FFS Adjuster referenced above. We will continue to work with CMS to ensure that MA plans are paid accurately and that payment model principles are in accordance with the requirements of the Social Security Act, which, if not implemented correctly could have a material adverse effect on our results of operations, financial position, or cash flows.

At December 31, 2015, our military services business, which accounted for approximately 1% of our total premiums and services revenue for the year ended December 31, 2015, primarily consisted of the TRICARE South Region contract. The current 5-year South Region contract, which expires March 31, 2017, is subject to annual renewals on April 1 of each year during its term at the government’s option. On January 22, 2016, we received notice from the Defense Health Agency, or DHA, of its intent to exercise its option to extend the TRICARE South Region contract through March 31, 2017. On April 24, 2015, a request for proposal was issued for the next generation of TRICARE contracts for the period beginning April 1, 2017. The request for proposal provides for the consolidation of three regions into two - East and West. The current North Region and South Region are to be combined to form the East Region. We responded to the request for proposal on July 22, 2015. On January 15, 2016, we received a request for Final Proposal Revisions that we responded to on February 16, 2016.

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Our state-based Medicaid business accounted for approximately 4% of our total premiums and services revenue for the year ended December 31, 2015. In addition to our state-based Temporary Assistance for Needy Families, or TANF, Medicaid contracts in Florida and Kentucky, we have contracts in Illinois and Virginia for stand-alone dual eligible demonstration programs serving individuals dually eligible for both the federal Medicare program and the applicable state-based Medicaid program as well as an Integrated Care Program, or ICP, Medicaid contract in Illinois. We began serving members in Illinois in the first quarter of 2014 and in Virginia in the second quarter of 2014. In addition, we began serving members in Long-Term Support Services (LTSS) regions in Florida at various effective dates ranging from the second half of 2013 through the first quarter of 2014.

The loss of any of the contracts above or significant changes in these programs as a result of legislative or regulatory action, including reductions in premium payments to us, regulatory restrictions on profitability, including by comparison of our Medicare Advantage profitability to our non-Medicare Advantage business profitability and a requirement that they remain within certain ranges of each other, or increases in member benefits without corresponding increases in premium payments to us, may have a material adverse effect on our results of operations, financial position, and cash flows.

Legal Proceedings and Certain Regulatory Matters

Florida Matters

On January 6, 2012, the Civil Division of the United States Attorney’s Office for the Southern District of Florida advised us that it is seeking documents and information from us and several of our affiliates relating to several matters including the coding of medical claims by one or more South Florida medical providers, and loans to physician practices. On May 1, 2014, the U.S. Attorney's Office filed a Notice of Non-Intervention in connection with a civil qui tam suit related to one of these matters captioned United States of America ex rel. Olivia Graves v. Plaza Medical Centers, et al., and the Court ordered the complaint unsealed. Subsequently, the individual plaintiff amended the complaint and served the Company, opting to continue to pursue the action. The individual plaintiff has filed a third amended complaint which we answered on October 16, 2015. The Court has ordered trial to commence on October 3, 2016 if the matter is not resolved prior to trial. We continue to cooperate with and respond to information requests from the U.S. Attorney’s office. These matters could result in additional qui tam litigation.

As previously disclosed, the Civil Division of the United States Department of Justice had provided us with an information request, separate from but related to the Plaza Medical matter, concerning our Medicare Part C risk adjustment practices. The request relates to our oversight and submission of risk adjustment data generated by providers in our Medicare Advantage network, including the providers identified in the Plaza Medical matter, as well as to our business and compliance practices related to risk adjustment data generated by our providers and by us, including medical record reviews conducted as part of our data and payment accuracy compliance efforts, the use of health and well-being assessments, and our fraud detection efforts. We believe that this request for information is in connection with a wider review of Medicare Risk Adjustment generally that includes a number of Medicare Advantage plans, providers and vendors. We continue to cooperate with and voluntarily respond to the information requests from the Department of Justice and the U.S. Attorney’s Office. These matters are expected to result in additional qui tam litigation.

On June 16, 2015, the U.S. Attorney’s Office filed a Declination Notice, indicating its intent not to intervene, in connection with a civil qui tam suit captioned U.S. ex rel. Ramsey-Ledesma v. Censeo, et al., and the Court ordered the complaint unsealed. Subsequently, the individual plaintiff filed a second amended complaint and served the Company, opting to continue to pursue the action. The plaintiff’s second amended complaint names several other defendants, including CenseoHealth. On January 8, 2016, we and the other defendants each filed a motion to dismiss the second amended complaint.

Litigation Related to the Merger

In connection with the Merger, three putative class action complaints were filed by purported Humana stockholders challenging the Merger, two in the Circuit Court of Jefferson County, Kentucky and one in the Court of Chancery of the State of Delaware. The complaints are captioned Solak v. Broussard et al., Civ. Act. No. 15CI03374 (Kentucky

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state court), Litwin v. Broussard et al., Civ. Act. No. 15CI04054 (Kentucky state court) and Scott v. Humana Inc. et al., C.A. No. 11323-VCL (Delaware state court). The complaints name as defendants each member of Humana’s board of directors, Aetna, and, in the case of the Delaware complaint, Humana. The complaints generally allege, among other things, that the individual members of our board of directors breached their fiduciary duties owed to our stockholders by entering into the Merger Agreement, approving the mergers as contemplated by the Merger Agreement, and failing to take steps to maximize the value of Humana to our stockholders, and that Aetna, and, in the case of the Delaware complaint, Humana aided and abetted such breaches of fiduciary duties. In addition, the complaints allege that the merger undervalues Humana, that the process leading up to the execution of the Merger Agreement was flawed, that the members of our board of directors improperly placed their own financial interests ahead of those of our stockholders, and that certain provisions of the Merger Agreement improperly favor Aetna and impede a potential alternative transaction. Among other remedies, the complaints seek equitable relief rescinding the Merger Agreement and enjoining the defendants from completing the mergers as well as costs and attorneys’ fees. We refer to all these cases collectively in this report as the Merger Litigation. On August 20, 2015, the parties in the Kentucky state cases filed a stipulation and proposed order with the court to consolidate these cases into a single action captioned In re Humana Inc. Shareholder Litigation, Civ. Act. No. 15CI03374.

On October 9, 2015, solely to avoid the costs, risks, and uncertainties inherent in litigation, and without admitting any liability or wrongdoing, we and the other named defendants in the Merger Litigation signed a memorandum of understanding, which we refer to as the MOU, to settle the Merger Litigation. Subject to court approval and further definitive documentation in a stipulation of settlement that will be subject to customary conditions, the MOU resolved the claims brought in the Merger Litigation and provided that we would make certain additional disclosures related to the proposed mergers. The MOU further provided for, among other things, dismissal of the Merger Litigation with prejudice and a release and settlement by the purported class of our stockholders of all claims against the defendants and their affiliates and agents in connection with the Merger Agreement and transactions and disclosures related to the Merger Agreement. The asserted claims will not be released until such stipulation of settlement receives court approval. The foregoing terms and conditions will be defined by the stipulation of settlement, and class members will receive a separate notice describing the settlement terms and their rights in connection with the approval of the settlement. In connection with the settlement, the parties contemplate that plaintiffs’ counsel will file a petition for an award of attorneys’ fees and expenses. We will pay or cause to be paid any court awarded attorneys’ fees and expenses. There can be no assurance that the parties will ultimately enter into a stipulation of settlement or that a court will approve such settlement even if the parties were to enter into such stipulation. In such event, the proposed settlement as contemplated by the MOU may be terminated. Because the MOU contemplates that the Kentucky court will be asked to approve the settlement, the plaintiffs have already withdrawn the Delaware case.

Other Lawsuits and Regulatory Matters

Our current and past business practices are subject to review or other investigations by various state insurance and health care regulatory authorities and other state and federal regulatory authorities. These authorities regularly scrutinize the business practices of health insurance, health care delivery and benefits companies. These reviews focus on numerous facets of our business, including claims payment practices, statutory capital requirements, provider contracting, risk adjustment, competitive practices, commission payments, privacy issues, utilization management practices, pharmacy benefits, access to care, and sales practices, among others. Some of these reviews have historically resulted in fines imposed on us and some have required changes to some of our practices. We continue to be subject to these reviews, which could result in additional fines or other sanctions being imposed on us or additional changes in some of our practices.

We also are involved in various other lawsuits that arise, for the most part, in the ordinary course of our business operations, certain of which may be styled as class-action lawsuits. Among other matters, this litigation may include employment matters, claims of medical malpractice, bad faith, nonacceptance or termination of providers, anticompetitive practices, improper rate setting, provider contract rate disputes, failure to disclose network discounts and various other provider arrangements, general contractual matters, intellectual property matters, and challenges to subrogation practices. For example, a number of hospitals and other providers have asserted that, under their network provider contracts, we are not entitled to reduce Medicare Advantage payments to these providers in connection with changes in Medicare payment systems and in accordance with the Balanced Budget and Emergency Deficit Control

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Act of 1985, as amended (commonly referred to as “sequestration”). Those challenges have led and could lead to arbitration demands or other litigation. Also, under state guaranty assessment laws, including those related to state cooperative failures in the industry, we may be assessed (up to prescribed limits) for certain obligations to the policyholders and claimants of insolvent insurance companies that write the same line or lines of business as we do.

As a government contractor, we may also be subject to qui tam litigation brought by individuals who seek to sue on behalf of the government, alleging that the government contractor submitted false claims to the government including, among other allegations, those resulting from coding and review practices under the Medicare risk adjustment model. Qui tam litigation is filed under seal to allow the government an opportunity to investigate and to decide if it wishes to intervene and assume control of the litigation. If the government does not intervene, the lawsuit is unsealed, and the individual may continue to prosecute the action on his or her own, on behalf of the government. We also are subject to other allegations of non-performance of contractual obligations to providers, members, and others, including failure to properly pay claims, improper policy terminations, challenges to our implementation of the Medicare Part D prescription drug program and other litigation.

A limited number of the claims asserted against us are subject to insurance coverage. Personal injury claims, claims for extracontractual damages, care delivery malpractice, and claims arising from medical benefit denials are covered by insurance from our wholly owned captive insurance subsidiary and excess carriers, except to the extent that claimants seek punitive damages, which may not be covered by insurance in certain states in which insurance coverage for punitive damages is not permitted. In addition, insurance coverage for all or certain forms of liability has become increasingly costly and may become unavailable or prohibitively expensive in the future.

We record accruals for the contingencies discussed in the sections above to the extent that we conclude it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. No estimate of the possible loss or range of loss in excess of amounts accrued, if any, can be made at this time regarding the matters specifically described above because of the inherently unpredictable nature of legal proceedings, which also may be exacerbated by various factors, including: (i) the damages sought in the proceedings are unsubstantiated or indeterminate; (ii) discovery is not complete; (iii) the proceeding is in its early stages; (iv) the matters present legal uncertainties; (v) there are significant facts in dispute; (vi) there are a large number of parties (including where it is uncertain how liability, if any, will be shared among multiple defendants); or (vii) there is a wide range of potential outcomes.

The outcome of any current or future litigation or governmental or internal investigations, including the matters described above, cannot be accurately predicted, nor can we predict any resulting judgments, penalties, fines or other sanctions that may be imposed at the discretion of federal or state regulatory authorities or as a result of actions by third parties. Nevertheless, it is reasonably possible that any such outcome of litigation, judgments, penalties, fines or other sanctions could be substantial, and the outcome of these matters may have a material adverse effect on our results of operations, financial position, and cash flows, and may also affect our reputation.

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17. SEGMENT INFORMATION

On January 1, 2015, we realigned certain of our businesses among our reportable segments to correspond with internal management reporting changes and renamed our Employer Group segment to the Group segment. Our three reportable segments remain Retail, Group, and Healthcare Services. The more significant realignments included reclassifying Medicare benefits offered to groups to the Retail segment from the Group segment, bringing all of our Medicare offerings, which are now managed collectively, together in one segment, recognizing that in some instances we market directly to individuals that are part of a group Medicare account. In addition, we realigned our military services business, primarily consisting of our TRICARE South Region contract previously included in the Other Businesses category, to our Group segment as we consider this contract with the government to be a group account. Prior period segment financial information has been recast to conform to the 2015 presentation.

We manage our business with three reportable segments: Retail, Group, and Healthcare Services. In addition, the Other Businesses category includes businesses that are not individually reportable because they do not meet the quantitative thresholds required by generally accepted accounting principles. These segments are based on a combination of the type of health plan customer and adjacent businesses centered on well-being solutions for our health plans and other customers, as described below. These segment groupings are consistent with information used by our Chief Executive Officer to assess performance and allocate resources.

The Retail segment consists of Medicare benefits, marketed to individuals or directly via group accounts, as well as individual commercial fully-insured medical and specialty health insurance benefits, including dental, vision, and other supplemental health and financial protection products. In addition, the Retail segment also includes our contract with CMS to administer the LI-NET prescription drug plan program and contracts with various states to provide Medicaid, dual eligible, and Long-Term Support Services benefits, collectively our state-based contracts. The Group segment consists of employer group commercial fully-insured medical and specialty health insurance benefits, including dental, vision, and other supplemental health and voluntary insurance benefits, as well as administrative services only, or ASO products. In addition, our Group segment includes our health and wellness products (primarily marketed to employer groups) and military services business, primarily our TRICARE South Region contract. The Healthcare Services segment includes services offered to our health plan members as well as to third parties, including pharmacy solutions, provider services, home based services, and clinical programs, as well as services and capabilities to advance population health. We will continue to report under the category of Other Businesses those businesses which do not align with the reportable segments described above, primarily our closed-block long-term care insurance policies.

Our Healthcare Services intersegment revenues primarily relate to managing prescription drug coverage for members of our other segments through Humana Pharmacy Solutions^®, or HPS, and includes the operations of Humana Pharmacy, Inc., our mail order pharmacy business. These revenues consist of the prescription price (ingredient cost plus dispensing fee), including the portion to be settled with the member (co-share) or with the government (subsidies), plus any associated administrative fees. Services revenues related to the distribution of prescriptions by third party retail pharmacies in our networks are recognized when the claim is processed and product revenues from dispensing prescriptions from our mail order pharmacies are recorded when the prescription or product is shipped. Our pharmacy operations, which are responsible for designing pharmacy benefits, including defining member co-share responsibilities, determining formulary listings, contracting with retail pharmacies, confirming member eligibility, reviewing drug utilization, and processing claims, act as a principal in the arrangement on behalf of members in our other segments. As principal, our Healthcare Services segment reports revenues on a gross basis including co-share amounts from members collected by third party retail pharmacies at the point of service.

In addition, our Healthcare Services intersegment revenues include revenues earned by certain owned providers derived from risk-based and non risk-based managed care agreements with our health plans. Under risk based agreements, the provider receives a monthly capitated fee that varies depending on the demographics and health status of the member, for each member assigned to these owned providers by our health plans. The owned provider assumes the economic risk of funding the assigned members’ healthcare services. Under non risk-based agreements, our health plans retain the economic risk of funding the assigned members' healthcare services. Our Healthcare Services segment reports provider services revenues associated with risk-based agreements on a gross basis, whereby capitation fee

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revenue is recognized in the period in which the assigned members are entitled to receive healthcare services. Provider services revenues associated with non risk-based agreements are presented net of associated healthcare costs.

We present our consolidated results of operations from the perspective of the health plans. As a result, the cost of providing benefits to our members, whether provided via a third party provider or internally through a stand-alone subsidiary, is classified as benefits expense and excludes the portion of the cost for which the health plans do not bear responsibility, including member co-share amounts and government subsidies of $12.3 billion in 2015, $9.7 billion in 2014, and $7.3 billion in 2013. In addition, depreciation and amortization expense associated with certain businesses in our Healthcare Services segment delivering benefits to our members, primarily associated with our provider services and pharmacy operations, are included with benefits expense. The amount of this expense was $92 million in 2015, $116 million in 2014, and $93 million in 2013.

Other than those described previously, the accounting policies of each segment are the same and are described in Note 2. Transactions between reportable segments primarily consist of sales of services rendered by our Healthcare Services segment, primarily pharmacy, provider, and home based services as well as clinical programs, to our Retail and Group customers. Intersegment sales and expenses are recorded at fair value and eliminated in consolidation. Members served by our segments often use the same provider networks, enabling us in some instances to obtain more favorable contract terms with providers. Our segments also share indirect costs and assets. As a result, the profitability of each segment is interdependent. We allocate most operating expenses to our segments. Assets and certain corporate income and expenses are not allocated to the segments, including the portion of investment income not supporting segment operations, interest expense on corporate debt, and certain other corporate expenses. These items are managed at a corporate level. These corporate amounts are reported separately from our reportable segments and are included with intersegment eliminations in the tables presenting segment results below.

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Our segment results were as follows for the years ended December 31, 2015, 2014, and 2013:

	Retail		Group		Healthcare Services		Other Businesses		Eliminations/ Corporate			Consolidated
	(in millions)
2015
Revenues—external customers
Premiums:
Individual Medicare Advantage	$	29,526	$	—	$	—	$	—	$	—		$	29,526
Group Medicare Advantage	5,588		—		—		—		—			5,588
Medicare stand-alone PDP	3,846		—		—		—		—			3,846
Total Medicare	38,960		—		—		—		—			38,960
Fully-insured	4,243		5,493		—		—		—			9,736
Specialty	261		1,055		—		—		—			1,316
Medicaid and other	2,341		21		—		35		—			2,397
Total premiums	45,805		6,569		—		35		—			52,409
Services revenue:
Provider	—		40		655		—		—			695
ASO and other	9		658		—		14		—			681
Pharmacy	—		—		30		—		—			30
Total services revenue	9		698		685		14		—			1,406
Total revenues—external customers	45,814		7,267		685		49		—			53,815
Intersegment revenues
Services	—		93		17,997		—		(18,090		)	—
Products	—		—		4,923		—		(4,923		)	—
Total intersegment revenues	—		93		22,920		—		(23,013		)	—
Investment income	134		26		—		76		238			474
Total revenues	45,948		7,386		23,605		125		(22,775		)	54,289
Operating expenses:
Benefits	39,708		5,266		—		87		(792		)	44,269
Operating costs	5,118		1,769		22,481		14		(22,064		)	7,318
Depreciation and amortization	192		93		143		—		(73		)	355
Total operating expenses	45,018		7,128		22,624		101		(22,929		)	51,942
Income from operations	930		258		981		24		154			2,347
Gain on sale of business	—		—		—		—		270			270
Interest expense	—		—		—		—		186			186
Income before income taxes	$	930	$	258	$	981	$	24	$	238		$	2,431

Premium and services revenues derived from our contracts with the federal government, as a percentage of our total premium and services revenues, was approximately 73% for 2015, compared to 73% for 2014, and 75% for 2013.

Benefits expense for the Retail segment for 2015 includes $176 million for a provision for probable future losses (premium deficiency) for individual commercial medical business compliant with the Health Care Reform Law for the 2016 coverage year as discussed more fully in Note 7.

130

Humana Inc.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

	Retail		Group		Healthcare Services		Other Businesses		Eliminations/ Corporate			Consolidated
	(in millions)
2014
Revenues—external customers
Premiums:
Individual Medicare Advantage	$	25,782	$	—	$	—	$	—	$	—		$	25,782
Group Medicare Advantage	5,490		—		—		—		—			5,490
Medicare stand-alone PDP	3,404		—		—		—		—			3,404
Total Medicare	34,676		—		—		—		—			34,676
Fully-insured	3,265		5,339		—		—		—			8,604
Specialty	256		1,098		—		—		—			1,354
Medicaid and other	1,255		19		—		51		—			1,325
Total premiums	39,452		6,456		—		51		—			45,959
Services revenue:
Provider	—		23		1,254		—		—			1,277
ASO and other	39		740		—		9		—			788
Pharmacy	—		—		99		—		—			99
Total services revenue	39		763		1,353		9		—			2,164
Total revenues—external customers	39,491		7,219		1,353		60		—			48,123
Intersegment revenues
Services	—		78		15,098		—		(15,176		)	—
Products	—		—		3,749		—		(3,749		)	—
Total intersegment revenues	—		78		18,847		—		(18,925		)	—
Investment income	97		23		—		60		197			377
Total revenues	39,588		7,320		20,200		120		(18,728		)	48,500
Operating expenses:
Benefits	33,508		5,130		—		102		(574		)	38,166
Operating costs	4,576		1,936		19,307		17		(18,197		)	7,639
Depreciation and amortization	165		103		155		—		(90		)	333
Total operating expenses	38,249		7,169		19,462		119		(18,861		)	46,138
Income from operations	1,339		151		738		1		133			2,362
Interest expense	—		—		—		—		192			192
Income (loss) before income taxes	$	1,339	$	151	$	738	$	1	$	(59	)	$	2,170

131

Humana Inc.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

	Retail		Group		Healthcare Services		Other Businesses			Eliminations/ Corporate			Consolidated
	(in millions)
2013
Revenues—external customers
Premiums:
Individual Medicare Advantage	$	22,481	$	—	$	—	$	—		$	—		$	22,481
Group Medicare Advantage	4,710		—		—		—			—			4,710
Medicare stand-alone PDP	3,033		—		—		—			—			3,033
Total Medicare	30,224		—		—		—			—			30,224
Fully-insured	1,160		5,117		—		—			—			6,277
Specialty	210		1,095		—		—			—			1,305
Medicaid and other	328		25		—		670			—			1,023
Total premiums	31,922		6,237		—		670			—			38,829
Services revenue:
Provider	—		21		1,291		—			—			1,312
ASO and other	18		714		—		6			—			738
Pharmacy	—		—		59		—			—			59
Total services revenue	18		735		1,350		6			—			2,109
Total revenues—external customers	31,940		6,972		1,350		676			—			40,938
Intersegment revenues
Services	—		51		11,890		—			(11,941		)	—
Products	—		—		2,803		—			(2,803		)	—
Total intersegment revenues	—		51		14,693		—			(14,744		)	—
Investment income	92		24		—		59			200			375
Total revenues	32,032		7,047		16,043		735			(14,544		)	41,313
Operating expenses:
Benefits	27,164		4,847		—		962			(409		)	32,564
Operating costs	3,232		1,860		15,372		56			(14,165		)	6,355
Depreciation and amortization	146		100		151		6			(70		)	333
Total operating expenses	30,542		6,807		15,523		1,024			(14,644		)	39,252
Income (loss) from operations	1,490		240		520		(289		)	100			2,061
Interest expense	—		—		—		—			140			140
Income (loss) before income taxes	$	1,490	$	240	$	520	$	(289	)	$	(40	)	$	1,921

Benefits expense for Other Businesses for 2013 includes $243 million for reserve strengthening associated with our closed block of long-term care insurance policies as discussed more fully in Note 18.

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Humana Inc.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

18. EXPENSES ASSOCIATED WITH LONG-DURATION INSURANCE PRODUCTS

Premiums associated with our long-duration insurance products accounted for approximately 1% of our consolidated premiums and services revenue for the year ended December 31, 2015. We use long-duration accounting for products such as long-term care, life insurance, annuities, and certain health and other supplemental policies sold to individuals because they are expected to remain in force for an extended period beyond one year and because premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. As a result, we defer policy acquisition costs, primarily consisting of commissions, and amortize them over the estimated life of the policies in proportion to premiums earned.

In addition, we establish reserves for future policy benefits in recognition of the fact that some of the premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. At policy issuance, these reserves are recognized on a net level premium method based on premium rate increase, interest rate, mortality, morbidity, persistency (the percentage of policies remaining in-force), and maintenance expense assumptions. The assumptions used to determine the liability for future policy benefits are established and locked in at the time each contract is issued and only change if our expected future experience deteriorates to the point that the level of the liability, together with the present value of future gross premiums, are not adequate to provide for future expected policy benefits and maintenance costs (i.e. the loss recognition date). As discussed in Note 2, beginning in 2014, health policies sold to individuals that conform to the Health Care Reform Law are accounted for under a short-duration model because premiums received in the current year are intended to pay anticipated benefits in that year.

The table below presents deferred acquisition costs and future policy benefits payable associated with our long-duration insurance products for the years ended December 31, 2015 and 2014.

	2015					2014
	Deferred acquisition costs		Future policy benefits payable			Deferred acquisition costs		Future policy benefits payable
	(in millions)
Other long-term assets	$	135	$	—		$	167	$	—
Trade accounts payable and accrued expenses	—		(64		)	—		(68		)
Long-term liabilities	—		(2,151		)	—		(2,349		)
Total asset (liability)	$	135	$	(2,215	)	$	167	$	(2,417	)

In addition, future policy benefits payable include amounts of $205 million at December 31, 2015 and $210 million at December 31, 2014 which are subject to 100% coinsurance agreements as more fully described in Note 19.

In 2015, we recorded a net reduction in benefits expense of $80 million associated with future policy benefits primarily due to the release of reserves as individual commercial medical members transitioned to plans compliant with the Health Care Reform Law. Benefits expense associated with future policy benefits payable was $32 million in 2014 and $354 million in 2013. Benefits expense for 2013 included net charges of $243 million associated with our closed block of long-term care insurance policies discussed further below. Amortization of deferred acquisition costs included in operating costs was $63 million in 2015, $39 million in 2014, and $55 million in 2013. The increase in amortization in 2015 primarily reflects the effect of existing previously underwritten members transitioning to policies compliant with the Health Care Reform Law with us and other carriers.

Future policy benefits payable include $1.5 billion at December 31, 2015 and2014associated with a non-strategic closed block of long-term care insurance policies acquired in connection with the 2007 acquisition of KMG.Future policy benefits payable includes amounts charged to accumulated other comprehensive income for an additional liability that would exist on our closed-block of long-term care insurance policies if unrealized gains on the sale of the investments backing such products had been realized and the proceeds reinvested at then current yields. There was no additional liability at December 31, 2015 and $123 million of additional liability at December 31,2014. Amounts charged to accumulated other comprehensive income are net of applicable deferred taxes.

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Humana Inc.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

Long-term care insurance policies provide nursing home and home health coverage for which premiums are collected many years in advance of benefits paid, if any. Therefore, our actual claims experience will emerge many years after assumptions have been established. The risk of a deviation of the actual premium rate increase, interest, morbidity, mortality, persistency, and maintenance expense assumptions from those assumed in our reserves are particularly significant to our closed block of long-term care insurance policies. We monitor the loss experience of these long-term care insurance policies and, when necessary, apply for premium rate increases through a regulatory filing and approval process in the jurisdictions in which such products were sold. To the extent premium rate increases, interest rates, and/or loss experience vary from our loss recognition date assumptions, material future adjustments to reserves could be required.

During 2013, we recorded a loss for a premium deficiency. The premium deficiency was based on current and anticipated experience that had deteriorated from our locked-in assumptions from the previous December 31, 2010 loss recognition date, particularly as they related to emerging experience due to an increase in life expectancies and utilization of home health care services. Based on this deterioration, and combined with lower interest rates, we determined that our existing future policy benefits payable, together with the present value of future gross premiums, associated with our closed block of long-term care insurance policies were not adequate to provide for future policy benefits and maintenance costs under these policies; therefore we unlocked and modified our assumptions based on current expectations. Accordingly, during 2013 we recorded $243 million of additional benefits expense, with a corresponding increase in future policy benefits payable of $350 million partially offset by a related reinsurance recoverable of $107 million included in other long-term assets.

Deferred acquisition costs included $26 million and $59 million associated with our individual commercial medical policies at December 31, 2015 and December 31, 2014, respectively. Future policy benefits payable associated with our individual commercial medical policies were $180 million at December 31, 2015 and $297 million at December 31, 2014. The decline in deferred acquisition costs and future policy benefits payable primarily reflects the effect of existing previously underwritten members transitioning to policies compliant with the Health Care Reform Law with us and other carriers.

19. REINSURANCE

Certain blocks of insurance assumed in acquisitions, primarily life, long-term care, and annuities in run-off status, are subject to reinsurance where some or all of the underwriting risk related to these policies has been ceded to a third party. In addition, a large portion of our reinsurance takes the form of 100% coinsurance agreements where, in addition to all of the underwriting risk, all administrative responsibilities, including premium collections and claim payment, have also been ceded to a third party. We acquired these policies and related reinsurance agreements with the purchase of stock of companies in which the policies were originally written. We acquired these companies for business reasons unrelated to these particular policies, including the companies’ other products and licenses necessary to fulfill strategic plans.

A reinsurance agreement between two entities transfers the underwriting risk of policyholder liabilities to a reinsurer while the primary insurer retains the contractual relationship with the ultimate insured. As such, these reinsurance agreements do not completely relieve us of our potential liability to the ultimate insured. However, given the transfer of underwriting risk, our potential liability is limited to the credit exposure which exists should the reinsurer be unable to meet its obligations assumed under these reinsurance agreements.

Reinsurance recoverables represent the portion of future policy benefits payable and benefits payable that are covered by reinsurance. Amounts recoverable from reinsurers are estimated in a manner consistent with the methods used to determine future policy benefits payable as detailed in Note 2. Excluding reinsurance associated with the Health Care Reform Law discussed in Note 2, reinsurance recoverables, included in other current and long-term assets, were $668 million at December 31, 2015 and $646 million at December 31, 2014. The percentage of these reinsurance recoverables resulting from 100% coinsurance agreements was approximately 43% at December 31, 2015 and approximately 45% at December 31, 2014. Premiums ceded were $821 million in 2015, $357 million in 2014 and $33 million in 2013. Benefits ceded were $666 million in 2015, $272 million in 2014, and $70 million in 2013. Ceded premium and benefits reflect a July 1, 2014 amendment ceding all risk under a Medicaid contract to a third party reinsurer.

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Humana Inc.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—(Continued)

We evaluate the financial condition of these reinsurers on a regular basis. These reinsurers are well-known and well-established, as evidenced by the strong financial ratings at December 31, 2015 presented below:

Reinsurer	Total Recoverable		A.M. Best Rating at December 31, 2015
	(in millions)
Protective Life Insurance Company	$	184	A+ (superior)
Munich American Reassurance Company	155		A+ (superior
Employers Reassurance Corporation	91		A- (excellent)
General Re Life Corporation	90		A++ (superior)
All others	148		A+ to B++ (superior to good)
	$	668

The all other category represents 18 reinsurers with individual balances less than $85 million. Three of these reinsurers with recoverables of $104 million are subject to trust or funds withheld accounts, requiring amounts at least equal to the total recoverable from each of these reinsurers.

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Report of Independent Registered Public Accounting Firm

Tothe Board of Directors and Stockholders of Humana Inc.:

In our opinion, the consolidated balance sheets and the related consolidated statements of income, of comprehensive income, of stockholders’ equity and of cash flows present fairly, in all material respects, the financial position of Humana Inc. and its subsidiariesat December 31, 2015 and 2014, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2015in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedules listed in the index appearing under Item 15(a)(2)present fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidatedfinancial statements. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company's management is responsible for these financial statements and financial statement schedules, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in Management's Report on Internal Control Over Financial Reporting appearing under Item 9A. Our responsibility is to express opinions on these financial statements, on the financial statement schedules, and on the Company's internal control over financial reporting based on our integrated audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ PricewaterhouseCoopers LLP

Louisville, Kentucky

February 18, 2016

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Humana Inc.

QUARTERLY FINANCIAL INFORMATION

(Unaudited)

A summary of our quarterly unaudited results of operations for the years ended December 31, 2015 and 2014 follows:

	2015
	First		Second		Third		Fourth (2)
	(in millions, except per share results)
Total revenues	$	13,833	$	13,732	$	13,363	$	13,361
Income before income taxes	744		793		648		246
Net income	430		431		314		101
Basic earnings per common share	$	2.86	$	2.88	$	2.11	$	0.68
Diluted earnings per common share (1)	$	2.82	$	2.85	$	2.09	$	0.67
	2014
	First		Second		Third		Fourth
	(in millions, except per share results)
Total revenues	$	11,712	$	12,222	$	12,238	$	12,328
Income before income taxes	686		646		551		287
Net income	368		344		290		145
Basic earnings per common share	$	2.37	$	2.22	$	1.87	$	0.96
Diluted earnings per common share (1)	$	2.35	$	2.19	$	1.85	$	0.94

(1) The calculation of diluted earnings per common share is based on the weighted average shares outstanding during each quarter and, accordingly, the sum may not equal the total for the year.

(2) The fourth quarter of 2015 includes an expense of $176 million ($112 million after tax, or $0.74 per diluted common share) for a premium deficiency reserve associated with our individual commercial medical policies compliant with the Health Care Reform Law associated with the 2016 coverage year.

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ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

Not applicable.

ITEM 9A. CONTROLS AND PROCEDURES

Management’s Responsibility for Financial Statements and Other Information

We are responsible for the preparation and integrity of the consolidated financial statements appearing in our Annual Report. The consolidated financial statements were prepared in conformity with accounting principles generally accepted in the United States and include amounts based on our estimates and judgments. All other financial information in this report has been presented on a basis consistent with the information included in the financial statements.

Our control environment is the foundation for our system of internal control over financial reporting and is embodied in our Code of Ethics and Business Conduct, which we currently refer to as the Humana Inc. Ethics Every Day. It sets the tone of our organization and includes factors such as integrity and ethical values. Our internal control over financial reporting is supported by formal policies and procedures which are reviewed, modified and improved as changes occur in business conditions and operations.

The Audit Committee of the Board of Directors, which is composed solely of independent outside directors, meets periodically with members of management, the internal auditors and our independent registered public accounting firm to review and discuss internal controls over financial reporting and accounting and financial reporting matters. Our independent registered public accounting firm and internal auditors report to the Audit Committee and accordingly have full and free access to the Audit Committee at any time.

Evaluation of Disclosure Controls and Procedures

We have established disclosure controls and procedures to ensure that material information relating to the Company, including its consolidated subsidiaries, is made known to members of senior management and the Board of Directors.

Based on our evaluation as of December 31, 2015, we as the principal executive officer and the principal financial officer and the principal accounting officer of the Company have concluded that the Company’s disclosure controls and procedures (as defined in the Securities Exchange Act of 1934) are effective to ensure that the information required to be disclosed by the Company in the reports that it files or submits under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported as specified in Securities and Exchange Commission rules and forms.

Management’s Report on Internal Control Over Financial Reporting

We are responsible for establishing and maintaining effective internal control over financial reporting as defined in Rule 13a-15(f) under the Securities Exchange Act of 1934. The Company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate or that the degree of compliance with the policies or procedures may deteriorate.

138

We assessed the effectiveness of the Company’s internal control over financial reporting as of December 31, 2015. In making this assessment, we used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control – Integrated Framework (2013). Based on our assessment, we determined that, as of December 31, 2015, the Company’s internal control over financial reporting was effective based on those criteria.

The effectiveness of our internal control over financial reporting as of December 31, 2015 has been audited by PricewaterhouseCoopers LLP, our independent registered public accounting firm, who also audited the Company’s consolidated financial statements included in our Annual Report on Form 10-K, as stated in their report which appears on page 136.

Changes in Internal Control over Financial Reporting

There have been no changes in the Company’s internal control over financial reporting during the quarter ended December 31, 2015 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

Bruce D. Broussard

President and Chief Executive Officer (Principal Executive Officer)

Brian A. Kane

Senior Vice President and Chief Financial Officer (Principal Financial Officer)

Cynthia H. Zipperle

Vice President, Chief Accounting Officer and Controller (Principal Accounting Officer)

ITEM 9B. OTHER INFORMATION

None.

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PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Directors

The information required by this Item is herein incorporated by reference from our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 21, 2016 appearing under the caption “Proposal One: Election of Directors” in such Proxy Statement.

Executive Officers of the Registrant

Set forth below are names and ages of all of our current executive officers as of February 1, 2016, their positions, and the date first elected an officer:

Name	Age	Position	First Elected Officer
Bruce D. Broussard	53	President and Chief Executive Officer, Director	12/11	(1)
James E. Murray	62	Executive Vice President and Chief Operating Officer	08/90	(2)
Roy A. Beveridge, M.D.	58	Senior Vice President and Chief Medical Officer	06/13	(3)
Jody L. Bilney	54	Senior Vice President and Chief Consumer Officer	04/13	(4)
Christopher H. Hunter	47	Senior Vice President and Chief Strategy Officer	01/14	(5)
Timothy S. Huval	49	Senior Vice President and Chief Human Resources Officer	12/12	(6)
Brian A. Kane	43	Senior Vice President and Chief Financial Officer	06/14	(7)
Christopher Kay	50	Senior Vice President and Chief Innovation Officer	03/14	(8)
Brian P. LeClaire	55	Senior Vice President and Chief Information Officer	08/11	(9)
Heidi S. Margulis	62	Senior Vice President – Corporate Affairs	12/95	(10)
Christopher M. Todoroff	53	Senior Vice President and General Counsel	08/08	(11)
Cynthia H. Zipperle	53	Vice President, Chief Accounting Officer and Controller	12/14	(12)

(1) Mr. Broussard currently serves as Director, President and Chief Executive Officer (Principal Executive Officer), having held these positions since January 1, 2013. Mr. Broussard was elected President upon joining the Company in December 2011 and served in that capacity through December 2012. Prior to joining the Company, Mr. Broussard was Chief Executive Officer of McKesson Specialty/US Oncology, Inc. US Oncology was purchased by McKesson in December 2010. At US Oncology, Mr. Broussard served in a number of senior executive roles, including Chief Financial Officer, Chief Executive Officer, and Chairman of the Board.

(2) Mr. Murray currently serves as Executive Vice President and Chief Operating Officer, having held this position since December 2011. Mr. Murray has held the position of Chief Operating Officer since February 2006, and was the Chief Operating Officer – Market and Business Segment Operations from September 2002 to February 2006. Mr. Murray joined the Company in December 1989.

(3) Dr. Beveridge currently serves as Senior Vice President and Chief Medical Officer, having held this position since joining the Company in June 2013. Prior to joining the Company, Dr. Beveridge served as Chief Medical Officer for McKesson Specialty Health from December 2010 until June 2013. Prior to McKesson’s acquisition

140

of US Oncology, Dr. Beveridge served as the Executive Vice President and Medical Director at US Oncology from September 2009 through December 2010.

(4) Ms. Bilney currently serves as Senior Vice President and Chief Consumer Officer, having held this position since joining the Company in April 2013. Prior to joining the Company, Ms. Bilney served as Executive Vice President and Chief Brand Officer for Bloomin’ Brands, Inc. from 2006 until April 2013.

(5) Mr. Hunter currently serves as Senior Vice President and Chief Strategy Officer, having held this position since joining the Company in January 2014. Prior to joining the Company, Mr. Hunter served as President of Provider Markets at The TriZetto Group, Inc. from July 2012 until December 2013, and as Senior Vice President, Emerging Markets at BlueCross BlueShield of Tennessee from 2009 through July 2012. While at BlueCross BlueShield of Tennessee, Mr. Hunter was simultaneously President and Chief Executive Officer of Onlife Health, a national health and wellness subsidiary of BlueCross BlueShield of Tennessee.

(6) Mr. Huval currently serves as Senior Vice President and Chief Human Resources Officer, having been elected to this position in December 2012. Prior to joining the Company, Mr. Huval spent 10 years at Bank of America in multiple senior-level roles, including Human Resources executive and Chief Information Officer for Global Wealth & Investment Management, as well as Human Resources executive for both Global Treasury Services and Technology & Global Operations.

(7) Mr. Kane currently serves as Senior Vice President and Chief Financial Officer, having been elected to this position in June 2014. Prior to joining the Company, Mr. Kane spent nearly 17 years at Goldman, Sachs & Co. As a managing director, he was responsible for client relationships as well as for leading strategic and financing transactions for a number of companies in multiple industries.

(8) Mr. Kay currently serves of Senior Vice President and Chief Innovation Officer, having been elected to this position in March 2014. Prior to joining the Company, Mr. Kay was most recently Managing Director and CEO of Citi Ventures, Citigroup’s global corporate venturing arm. Prior to joining Citi in 2007, Mr. Kay held several leadership positions at Target over a 12-year period.

(9) Mr. LeClaire currently serves as Senior Vice President and Chief Information Officer, having held this position since January 2014. Prior to that, he served as Senior Vice President and Chief Service and Information Officer from August 2011 to January 2014, and as Chief Technology Officer from 2002 to August 2011. Mr. LeClaire joined the Company in August 1999.

(10) Ms. Margulis currently serves as Senior Vice President – Corporate Affairs, having held this position since January 2000. Ms. Margulis joined the Company in November 1985.

(11) Mr. Todoroff currently serves as Senior Vice President and General Counsel, having held this position since August 2008. Prior to joining the Company, Mr. Todoroff served as Vice President, Senior Corporate Counsel and Corporate Secretary for Aetna Inc. from 2006 through July 2008. Mr. Todoroff joined Aetna’s Legal Department in 1995 and held various positions of increasing responsibility.

(12) Mrs. Zipperle currently serves as Vice President, Chief Accounting Officer and Controller, having held this position since December 2014. Mrs. Zipperle previously served as the Vice President - Finance from January 2013 until her election to her current role, and as the Assistant Controller from January 1998 until January 2013.

Executive officers are elected annually by our Board of Directors and serve until their successors are elected or until resignation or removal. There are no family relationships among any of our executive officers.

Section 16(a) Beneficial Ownership Reporting Compliance

The information required by this Item is herein incorporated by reference from our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 21, 2016 appearing under the caption “Section 16(a) Beneficial Ownership Reporting Compliance” of such Proxy Statement.

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Code of Conduct for Chief Executive Officer and Senior Financial Officers

We have adopted a Code of Conduct for the Chief Executive Officer and Senior Financial Officers, violations of which should be reported to the Audit Committee. The code may be viewed through the Investor Relations section of our web site at www.humana.com. Any amendment to or waiver of the application of the Code of Conduct for the Chief Executive Officer and Senior Financial Officers will be promptly disclosed through the Investor Relations section of our web site at www.humana.com.

Code of Business Conduct and Ethics

Since 1995, we have operated under an omnibus Code of Ethics and Business Conduct, currently known as the Humana Inc. Ethics Every Day. All employees and directors are required to annually affirm in writing their acceptance of the code. The Humana Inc. Ethics Every Day was adopted by our Board of Directors in June 2014, replacing a previous iteration of our Code of Ethics and Business Conduct – the Humana Inc. Principles of Business Ethics – as the document to comply with the New York Stock Exchange Corporate Governance Standard 303A.10. The Humana Inc. Ethics Every Day is available on our web site at www.humana.com. Any waiver of the application of the Humana Inc. Principles of Business Ethics to directors or executive officers must be made by the Board of Directors and will be promptly disclosed on our web site at www.humana.com.

Corporate Governance Items

We have made available free of charge on or through the Investor Relations section of our web site at www.humana.com our annual reports on Form 10-K, quarterly reports on Form 10-Q, proxy statements, and all of our other reports, and, if applicable, amendments to those reports filed or furnished pursuant to Section 13(a) of the Exchange Act, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. Also available on our Internet web site is information about our corporate governance, including:

• a determination of independence for each member of our Board of Directors;

• the name, membership, role, and charter of each of the various committees of our Board of Directors;

• the name(s) of the directors designated as a financial expert under rules and regulations promulgated by the SEC;

• the responsibility of the Company’s Lead Independent Director, if applicable, to convene, set the agenda for, and lead executive sessions of the non-management directors;

• the pre-approval process of non-audit services provided by our independent accountants;

• our by-laws and Certificate of Incorporation;

• our Majority Vote policy;

• our Related Persons Transaction Policy;

• the process by which interested parties can communicate with directors;

• the process by which stockholders can make director nominations (pursuant to our By-laws);

• our Corporate Governance Guidelines;

• our Policy Regarding Transactions in Company Securities, Inside Information and Confidentiality;

• Stock Ownership Guidelines for directors and for executive officers;

• the Humana Inc. Ethics Every Day and any waivers thereto; and

• the Code of Conduct for the Chief Executive Officer and Senior Financial Officers and any waivers thereto.

Additional information about these items can be found in, and is incorporated by reference to, our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 21, 2016.

Material Changes to the Procedures by which Security Holders May Recommend Nominees to the Registrant’s Board of Directors

None.

142

Audit Committee Financial Expert

The information required by this Item is herein incorporated by reference from our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 21, 2016 appearing under the caption “Corporate Governance – Audit Committee” of such Proxy Statement.

Audit Committee Composition and Independence

The information required by this Item is herein incorporated by reference from our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 21, 2016 appearing under the caption “Corporate Governance – Committee Membership and Attendance” of such Proxy Statement.

ITEM 11. EXECUTIVE COMPENSATION

Additional information required by this Item is incorporated herein by reference from our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 21, 2016 appearing under the captions “Corporate Governance – Organization & Compensation Committee – Compensation Committee Interlocks and Insider Participation,” “Director Compensation,” “Compensation Discussion and Analysis,” “Organization & Compensation Committee Report,” and “Executive Compensation” of such Proxy Statement.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

Equity compensation plan information

We maintain plans under which options to purchase our common stock and awards of restricted stock may be made to officers, directors, key employees, and consultants. Stock options are granted with an exercise price equal to the fair market value of the underlying common stock on the date of grant. Our stock plans, as approved by the Board of Directors and stockholders, define fair market value as the average of the highest and lowest stock prices reported on the composite tape by the New York Stock Exchange on a given date. Exercise provisions vary, but most options vest in whole or in part 1 to 3 years after grant and expire up to 7 years after grant.

Information concerning stock option awards and the number of securities remaining available for future issuance under our equity compensation plans in effect as of December 31, 2015 follows:

Plan category	(a) Number of  securities to be issued upon exercise of outstanding options, warrants and rights	(b) Weighted-average exercise price of outstanding options, warrants and rights		(c) Number of  securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column(a))
Equity compensation plans approved by     security holders (1)	835,123	$	121.889	8,734,399	(2)(3)
Equity compensation plans not approved     by security holders	—	—		—
Total	835,123	$	121.889	8,734,399

(1) The above table does not include awards of shares of restricted stock or restricted stock units. For information concerning these awards, see Note 13.

(2) The Humana Inc. 2011 Stock Incentive Plan was approved by stockholders at the Annual Meeting held on April 21, 2011. On July 5, 2011, 18.5 million shares were registered with the Securities and Exchange Commission on Form S-8.

(3) Of the number listed above, 3,814,148 can be issued as restricted stock at December 31, 2015 (giving effect to the provision that one restricted share is equivalent to 2.29 stock options in the 2011 Plan).

143

The information under the captions “Security Ownership of Certain Beneficial Owners of Company Common Stock” and “Security Ownership of Directors and Executive Officers” in our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 21, 2016, is herein incorporated by reference.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by this Item is herein incorporated by reference from our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 21, 2016 appearing under the captions “Certain Transactions with Management and Others” and “Corporate Governance – Independent Directors” of such Proxy Statement.

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

The information required by this Item is herein incorporated by reference from our Proxy Statement for the Annual Meeting of Stockholders scheduled to be held on April 21, 2016 appearing under the caption “Audit Committee Report” of such Proxy Statement.

144

PART IV

ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(a)	The financial statements, financial statement schedules and exhibits set forth below are filed as part of this report.
(1)	Financial Statements – The response to this portion of Item 15 is submitted as Item 8 of Part II of this report.
(2)	The following Consolidated Financial Statement Schedules are included herein:
	Schedule I	Parent Company Financial Information
	Schedule II	Valuation and Qualifying Accounts

All other schedules have been omitted because they are not applicable.

(3) Exhibits:

2.1	Agreement and Plan of Merger, dated as of July 2, 2015 among Aetna Inc., Echo Merger Sub, Inc., Echo Merger Sub, LLC and Humana Inc. (incorporated herein by reference to Exhibit 2.1 to Humana Inc.’s Current Report on Form 8-K filed on July 7, 2015).
3(a)	Restated Certificate of Incorporation of Humana Inc. filed with the Secretary of State of Delaware on November 9, 1989, as restated to incorporate the amendment of January 9, 1992, and the correction of March 23, 1992 (incorporated herein by reference to Exhibit 4(i) to Humana Inc.’s Post-Effective Amendment No.1 to the Registration Statement on Form S-8 (Reg. No. 33-49305) filed February 2, 1994).
(b)	By-Laws of Humana Inc., as amended on January 4, 2007 (incorporated herein by reference to Exhibit 3 to Humana Inc.’s Annual Report on Form 10-K for the year ended December 31, 2006).
4(a)	Indenture, dated as of August 5, 2003, by and between Humana Inc. and The Bank of New York, as trustee (incorporated herein by reference to Exhibit 4.1 to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2003).
(b)	First Supplemental Indenture, dated as of August 5, 2003, by and between Humana Inc. and The Bank of New York, as trustee (incorporated herein by reference to Exhibit 4.2 to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2003).
(c)	Second Supplemental Indenture, dated as of May 31, 2006, by and between Humana Inc. and The Bank of New York Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.1 to Humana Inc.’s Current Report on Form 8-K filed on May 31, 2006).
(d)	Third Supplemental Indenture, dated as of June 5, 2008, by and between Humana Inc. and The Bank of New York Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.1 to Humana Inc.’s Current Report on Form 8-K filed on June 5, 2008).
(e)	Fourth Supplemental Indenture, dated as of June 5, 2008, by and between Humana Inc. and The Bank of New York Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.3 to Humana Inc.’s Current Report on Form 8-K filed on June 5, 2008).
(f)	Indenture, dated as of March 30, 2006, by and between Humana Inc. and The Bank of New York Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.2 to Humana Inc.’s Registration Statement on Form S-3 filed on March 31, 2006).
(g)	There are no instruments defining the rights of holders with respect to long-term debt in excess of 10 percent of the total assets of Humana Inc. on a consolidated basis. Other long-term indebtedness of Humana Inc. is described herein in Note 12 to Consolidated Financial Statements. Humana Inc. agrees to furnish copies of all such instruments defining the rights of the holders of such indebtedness not otherwise filed as an Exhibit to this Annual Report on Form 10-K to the Commission upon request.

145

(h)	Fifth Supplemental Indenture, dated as of December 10, 2012, by and between Humana Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.1 to Humana Inc.’s Current Report on Form 8-K filed on December 10, 2012).
(i)	Sixth Supplemental Indenture, dated as of December 10, 2012, by and between Humana Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.3 to Humana Inc.’s Current Report on Form 8-K filed on December 10, 2012).
(j)	Seventh Supplemental Indenture, dated as of September 19, 2014, by and between Humana Inc. and The Bank of New York, Mellon Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.2 to Humana Inc.’s Current Report on Form 8-K filed on September 19, 2014).
(k)	Eighth Supplemental Indenture, dated as of September 19, 2014, by and between Humana Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.4 to Humana Inc.’s Current Report on Form 8-K filed on September 19, 2014).
(l)	Ninth Supplemental Indenture, dated as of September 19, 2014, by and between Humana Inc. and The Bank of New York Mellon Trust Company, N.A., as trustee (incorporated herein by reference to Exhibit 4.6 to Humana Inc.’s Current Report on Form 8-K filed on September 19, 2014).
10(a)*†	Form of Company’s Restricted Stock Unit Agreement and Agreement not to Compete or Solicit under the 2011 Stock Incentive Plan (with retirement provisions)
(b)*†	Form of Company’s Restricted Stock Unit Agreement and Agreement not to Compete or Solicit under the 2011 Stock Incentive Plan (without retirement provisions).
(c)*	Humana Inc. Amended and Restated 2003 Stock Incentive Plan (incorporated herein by reference to Appendix A to Humana Inc.’s Proxy Statement with respect to the Annual Meeting of Stockholders held on April 27, 2006).
(d)*	Humana Inc. Executive Management Incentive Compensation Plan, as amended and restated February 1, 2008 (incorporated herein by reference to Appendix A to Humana Inc.’s Proxy Statement with respect to the Annual Meeting of Stockholders held on April 24, 2008).
(e)*	Form of Change of Control Agreement (incorporated herein by reference to Exhibit 10.2 to Humana Inc.’s current report on Form 8-K filed on February 24, 2014).
(f)*	Trust under Humana Inc. Deferred Compensation Plans (incorporated herein by reference to Exhibit 10(p) to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 1999).
(g)*	The Humana Inc. Deferred Compensation Plan for Non-Employee Directors (as amended on October 18, 2012) (incorporated herein by reference to Exhibit 10(m) to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012).
(h)*	Severance policy as amended and restated on October 23, 2007 (incorporated herein by reference to Exhibit 10(r) to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2007).
(i)*	Humana Inc. Deferred Compensation Plan (incorporated herein by reference to Exhibit 4.1 to the Company’s Registration Statement on Form S-8 (Reg. No. 333-171616), filed on January 7, 2011).
(j)*	Humana Retirement Equalization Plan, as amended and restated as of January 1, 2011 (incorporated herein by reference to Exhibit 10(p) to Humana Inc.’s Annual Report on Form 10-K filed on February 17, 2011).
(k)*	Letter agreement with Humana Inc. officers concerning health insurance availability (incorporated herein by reference to Exhibit 10(mm) to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 1994).
(l)*	Executive Long-Term Disability Program (incorporated herein by reference to Exhibit 10(a) to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2004).

146

(m)*	Indemnity Agreement (incorporated herein by reference to Appendix B to Humana Inc.’s Proxy Statement with respect to the Annual Meeting of Stockholders held on January 8, 1987).
(n)* **	Form of Company’s Restricted Stock Unit Agreement with Time/Performance Vesting and Agreement not to Compete or Solicit, under the 2011 Stock Incentive Plan (incorporated herein by reference to Exhibit 10(t) to Humana Inc.’s Annual Report on Form 10-K/A filed on January 30, 2014).
(o)*†	Form of Company’s Restricted Stock Unit Agreement and Agreement not to Solicit under the 2011 Stock Incentive Plan (with retirement provisions).
(p)*	Summary of the Company’s Financial Planning Program for our executive officers (incorporated herein by reference to Exhibit 10(v) to Humana’s Inc.’s Annual Report on Form 10-K filed on February 22, 2013.
(q)*†	Form of Company’s Restricted Stock Unit Agreement and Agreement not to Solicit under the 2011 Stock Incentive Plan (without retirement provisions).
(r)	Five-Year Credit Agreement, dated as of July 9, 2013 (incorporated herein by reference to Exhibit 10 to Humana Inc.’s Current Report on Form 8-K filed on July 10, 2013).
(s)	Form of CMS Coordinated Care Plan Agreement (incorporated herein by reference to Exhibit 10.1 to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2005).
(t)	Form of CMS Private Fee for Service Agreement (incorporated herein by reference to Exhibit 10.2 to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2005).
(u)	Addendum to Agreement Providing for the Operation of a Medicare Voluntary Prescription Drug Plan (incorporated herein by reference to Exhibit 10.3 to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2005).
(v)	Addendum to Agreement Providing for the Operation of an Employer/Union-only Group Medicare Advantage Prescription Drug Plan (incorporated herein by reference to Exhibit 10.4 to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2005).
(w)	Addendum to Agreement Providing for the Operation of an Employer/Union-only Group Medicare Advantage-Only Plan (incorporated herein by reference to Exhibit 10.5 to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2005).
(x)	Addendum to Agreement Providing for the Operation of a Medicare Advantage Regional Coordinated Care Plan (incorporated herein by reference to Exhibit 10.6 to Humana Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2005).
(y)	Explanatory Note regarding Medicare Prescription Drug Plan Contracts between Humana and CMS (incorporated herein by reference to Exhibit 10(nn) to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2005).
(z)*	Humana Inc. 2011 Stock Incentive Plan (incorporated herein by reference to Appendix A to Humana Inc.’s Proxy Statement with respect to the Annual Meeting of Stockholders held on April 21, 2011).
(aa)*	Form of Company’s Stock Option Agreement under the 2011 Stock Incentive Plan (Non-Qualified Stock Options with Non-Compete/Non-Solicit) (incorporated herein by reference to Exhibit 10(oo) to Humana Inc.’s Annual Report on Form 10-K filed on February 24, 2012).
(bb)*	Form of Company’s Stock Option Agreement under the 2011 Stock Incentive Plan (Incentive Stock Options with Non-Compete/Non-Solicit) (incorporated herein by reference to Exhibit 10(pp) to Humana Inc.’s Annual Report on Form 10-K filed on February 24, 2012).
(cc)*	Form of Company’s Restricted Stock Unit Agreement and Agreement not to Compete or Solicit under the 2011 Stock Incentive Plan (incorporated herein by reference to Exhibit 10(rr) to Humana Inc.’s Annual Report on Form 10-K filed on February 24, 2012).

147

(dd)*	Amended and Restated Employment Agreement, dated as of February 27, 2014, by and between Humana Inc. and Bruce D. Broussard (incorporated herein by reference to Exhibit 10.1 to Humana Inc.’s current report on Form 8-K filed on February 28, 2014).
(ee)*	Amendment to the Amended and Restated Employment Agreement between Humana Inc. and Bruce D. Broussard, dated July 2, 2015 (incorporated herein by reference to Exhibit 10.1 to Humana Inc.’s current report on Form 8-K filed on July 9, 2015).
(ff)**	Agreement between the United States Department of Defense and Humana Military Healthcare Services, Inc., a wholly owned subsidiary of Humana Inc., dated as March 3, 2011 (incorporated herein by reference to Exhibit 10(mm) to Humana Inc.’s Annual Report on Form 10-K filed on February 24, 2012).
(gg)*	Form of Amendment to Change of Control Agreement between Humana Inc. and various executive officers (incorporated herein by reference to Exhibit 10.1 to Humana Inc.’s current report on Form 8-K filed on February 24, 2014).
(hh)	Form of Commercial Paper Dealer Agreement between Humana Inc., as Issuer, and the Dealer party thereto (incorporated herein by reference to Exhibit 10.1 to Humana Inc.’s current report on Form 8-K filed on October 6, 2014).
(ii)	Master Confirmation by and between Humana Inc. and Goldman, Sachs & Co., dated November 7, 2014 (incorporated herein by reference to Humana Inc.’s current report on Form 8-K filed on November 10, 2014).
(jj)*†	Form of Company's Stock Option Agreement under the 2011 Stock Incentive Plan (Incentive Stock Options).
(kk)*†	Form of Company's Stock Option Agreement under the 2011 Stock Incentive Plan (Non-Qualified Stock Options with Non-Compete/Non-Solicit).
12 †	Computation of ratio of earnings to fixed charges.
14	Code of Conduct for Chief Executive Officer & Senior Financial Officers (incorporated herein by reference to Exhibit 14 to Humana Inc.’s Annual Report on Form 10-K for the fiscal year ended December 31, 2003).
21 †	List of subsidiaries.
23 †	Consent of PricewaterhouseCoopers LLP.
31.1 †	CEO certification pursuant to Rule 13a-14(a)/15d-14(a).
31.2 †	CFO certification pursuant to Rule 13a-14(a)/15d-14(a).
32 †	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes – Oxley Act of 2002.

101 The following materials from Humana Inc.'s Annual Report on Form 10-K formatted in XBRL (Extensible Business Reporting Language): (i) the Consolidated Balance Sheets at December 31, 2015 and 2014; (ii) the Consolidated Statements of Income for the years ended December 31, 2015, 2014 and 2013; (iii) the Consolidated Statements of Comprehensive Income for the years ended December 31, 2015, 2014 and 2013; (iv) the Consolidated Statements of Stockholders’ Equity as of December 31, 2015, 2014, and 2013; (v) the Consolidated Statements of Cash Flows for the years ended December 31, 2015, 2014 and 2013; and (vi) Notes to Consolidated Financial Statements.

*Exhibits 10(a) through and including 10(q) and 10(z) through and including 10(ee),10(gg),10(jj) and 10(ii) are compensatory plans or management contracts.

**Pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended, confidential portions of this exhibit have been omitted and filed separately with the Securities and Exchange Commission pursuant to a request for confidential treatment.

†Submitted electronically with this report.

148

Humana Inc.

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

CONDENSED BALANCE SHEETS

	December 31,
	2015			2014
	(in millions, except share amounts)
ASSETS
Current assets:
Cash and cash equivalents	$	1,389		$	1,211
Investment securities	256			201
Receivable from operating subsidiaries	1,124			873
Other current assets	224			180
Total current assets	2,993			2,465
Property and equipment, net	1,011			885
Investments in subsidiaries	14,276			13,983
Other long-term assets	437			114
Total assets	$	18,717		$	17,447
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Payable to operating subsidiaries	$	3,322		$	3,130
Current portion of notes payable to operating subsidiaries	28			28
Book overdraft	38			54
Short-term borrowings	299			—
Other current liabilities	572			562
Total current liabilities	4,259			3,774
Long-term debt	3,821			3,825
Notes payable to operating subsidiaries	9			9
Other long-term liabilities	282			193
Total liabilities	8,371			7,801
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $1 par; 10,000,000 shares authorized; none issued	—			—
Common stock, $0.16 2/3 par; 300,000,000 shares authorized; 198,372,059 shares issued at December 31, 2015 and 197,951,551 shares issued at December 31, 2014	33			33
Capital in excess of par value	2,530			2,330
Retained earnings	11,017			9,916
Accumulated other comprehensive income	58			223
Treasury stock, at cost, 50,084,043 shares at December 31, 2015 and 48,347,541 shares at December 31, 2014	(3,292		)	(2,856		)
Total stockholders’ equity	10,346			9,646
Total liabilities and stockholders’ equity	$	18,717		$	17,447

See accompanying notes to the parent company financial statements.

149

Humana Inc.

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

CONDENSED STATEMENTS OF INCOME

	For the year ended December 31,
	2015			2014			2013
	(in millions)
Revenues:
Management fees charged to operating subsidiaries	$	1,469		$	1,509		$	1,370
Investment and other income, net	5			4			3
	1,474			1,513			1,373
Expenses:
Operating costs	1,370			1,434			1,366
Depreciation	252			212			193
Interest	186			192			141
	1,808			1,838			1,700
Loss before gain on sale of business, income taxes and equity in net earnings of subsidiaries	(334		)	(325		)	(327		)
Gain on sale of business	270			—			—
Loss before income taxes and equity in net earnings of subsidiaries	(64		)	(325		)	(327		)
Benefit for income taxes	(70		)	(81		)	(107		)
Income (loss) before equity in net earnings of subsidiaries	6			(244		)	(220		)
Equity in net earnings of subsidiaries	1,270			1,391			1,451
Net income	$	1,276		$	1,147		$	1,231

See accompanying notes to the parent company financial statements.

150

Humana Inc.

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

CONDENSED STATEMENTS OF COMPREHENSIVE INCOME

	For the year ended December 31,
	2015			2014			2013
	(in millions)
Net income	$	1,276		$	1,147		$	1,231
Other comprehensive (loss) income:
Change in gross unrealized investment gains/losses	(114		)	122			(338		)
Effect of income taxes	42			(44		)	124
Total change in unrealized investment gains/losses, net of tax	(72		)	78			(214		)
Reclassification adjustment for net realized gains included in investment income	(146		)	(20		)	(22		)
Effect of income taxes	53			7			8
Total reclassification adjustment, net of tax	(93		)	(13		)	(14		)
Other comprehensive (loss) income, net of tax	(165		)	65			(228		)
Comprehensive income	$	1,111		$	1,212		$	1,003

See accompanying notes to the parent company financial statements.

151

Humana Inc.

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

CONDENSED STATEMENTS OF CASH FLOWS

	For the year ended December 31,
	2015			2014			2013
	(in millions)
Net cash provided by operating activities	$	953		$	1,499		$	1,554
Cash flows from investing activities:
Proceeds from sale of business	1,055			—			—
Acquisitions	—			—			—
Capital contributions to operating subsidiaries	(833		)	(442		)	(521		)
Purchases of investment securities	(507		)	(629		)	(320		)
Proceeds from sale of investment securities	18			606			35
Maturities of investment securities	108			149			104
Purchases of property and equipment, net	(378		)	(380		)	(223		)
Net cash used in investing activities	(537		)	(696		)	(925		)
Cash flows from financing activities:
Proceeds from issuance of senior notes, net	—			1,733			—
Proceeds from issuance of commercial paper, net	298			—			—
Repayment of long-term debt	—			(500		)	—
Change in book overdraft	(16		)	(5		)	7
Common stock repurchases	(385		)	(872		)	(531		)
Dividends paid	(172		)	(172		)	(168		)
Tax benefit from stock-based compensation	15			12			8
Proceeds from stock option exercises and other	22			51			65
Net cash (used in) provided by financing activities	(238		)	247			(619		)
Increase in cash and cash equivalents	178			1,050			10
Cash and cash equivalents at beginning of year	1,211			161			151
Cash and cash equivalents at end of year	$	1,389		$	1,211		$	161

See accompanying notes to the parent company financial statements.

152

Humana Inc.

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

NOTES TO CONDENSED FINANCIAL STATEMENTS

1. BASIS OF PRESENTATION

Parent company financial information has been derived from our consolidated financial statements and excludes the accounts of all operating subsidiaries. This information should be read in conjunction with our consolidated financial statements.

Related Party

Refer to Note 2 of the notes to consolidated financial statements in this Annual Report on Form 10-K for a description of our related party transactions. A related party note receivable in the amount of $284 million is included with other long-term assets in our condensed balance sheet at December 31, 2015 and with purchases of investment securities in our condensed statement of cash flows. The related interest income is included in investment income in our consolidated statement of income.

2. TRANSACTIONS WITH SUBSIDIARIES

Management Fee

Through intercompany service agreements approved, if required, by state regulatory authorities, Humana Inc., our parent company, charges a management fee for reimbursement of certain centralized services provided to its subsidiaries including information systems, disbursement, investment and cash administration, marketing, legal, finance, and medical and executive management oversight.

Dividends

Cash dividends received from subsidiaries and included as a component of net cash provided by operating activities were $493 million in 2015, $927 million in 2014, and $967 million in 2013. Subsidiary dividends in 2015 reflect the impact of losses for our individual commercial medical business compliant with the Health Care Reform Law and the November 5, 2015 revised statutory accounting guidance requiring the exclusion of risk corridor receivables from related statutory surplus discussed in Note 3 below.

Guarantee

Through indemnity agreements approved by state regulatory authorities, certain of our regulated subsidiaries generally are guaranteed by our parent company in the event of insolvency for: (1) member coverage for which premium payment has been made prior to insolvency; (2) benefits for members then hospitalized until discharged; and (3) payment to providers for services rendered prior to insolvency. Our parent has also guaranteed the obligations of our military services subsidiaries.

Notes Receivables from Operating Subsidiaries

We funded certain subsidiaries with surplus note agreements. These notes are generally non-interest bearing and may not be entered into or repaid without the prior approval of the applicable Departments of Insurance or other state regulatory authorities.

Notes Payable to Operating Subsidiaries

We borrowed funds from certain subsidiaries with notes generally collateralized by real estate. These notes, which have various payment and maturity terms, bear interest ranging from 1.51% to 6.65% and are payable in 2016 and 2019. We recorded interest expense of $1 million related to these notes for each of the years ended December 31, 2015, 2014 and 2013.

153

Humana Inc.

SCHEDULE I—PARENT COMPANY FINANCIAL INFORMATION

NOTES TO CONDENSED FINANCIAL STATEMENTS—(Continued)

3. REGULATORY REQUIREMENTS

Certain of our insurance subsidiaries operate in states that regulate the payment of dividends, loans, or other cash transfers to Humana Inc., our parent company, and require minimum levels of equity as well as limit investments to approved securities. The amount of dividends that may be paid to Humana Inc. by these insurance subsidiaries, without prior approval by state regulatory authorities, or ordinary dividends, is limited based on the entity’s level of statutory income and statutory capital and surplus. In most states, prior notification is provided before paying a dividend even if approval is not required.

Although minimum required levels of equity are largely based on premium volume, product mix, and the quality of assets held, minimum requirements vary significantly at the state level. Our state regulated insurances subsidiaries had aggregate statutory capital and surplus of approximately$6.6 billion and $6.0 billion as of December 31, 2015 and 2014, respectively, which exceeded aggregate minimum regulatory requirements of$4.6 billion and $4.1 billion, respectively. Subsidiary dividends are subject to state regulatory approval, the amount and timing of which could be reduced or delayed. Excluding Puerto Rico subsidiaries, the amount of ordinary dividends that may be paid to our parent company in2016is approximately$900 millionin the aggregate. This compares to dividends that were paid to our parent company in2015of approximately$493 million. Actual dividends paid may vary due to consideration of excess statutory capital and surplus and expected future surplus requirements related to, for example, premium volume and product mix.

On November 5, 2015, the National Association of Insurance Commissioners, or NAIC, issued statutory accounting guidance for receivables associated with the risk corridor provisions under the Health Care Reform Law, which requires the receivables to be excluded from subsidiary surplus. This accounting guidance required additional capital contributions into certain subsidiaries during 2015.

Certain regulated subsidiaries recognized premium deficiency reserves for our individual commercial medical policies compliant with the Health Care Reform Law for the 2016 coverage year in the fourth quarter of 2015. Further, the statutory-based premium deficiency excludes the estimated benefit associated with the risk corridor provisions as a reduction in subsidiary surplus in accordance with the previously discussed November 5, 2015 statutory accounting guidance requiring the exclusion of risk corridor amounts from subsidiary surplus. As a result of the statutory-based premium deficiency, we will fund capital contributions into certain regulated subsidiaries of $450 million during the first quarter of 2016.

Our use of operating cash flows derived from our non-insurance subsidiaries, such as in our Healthcare Services segment, is generally not restricted by state departments of insurance (or comparable state regulators).

4. ACQUISITIONS AND DIVESTITURES

Refer to Note 3 of the notes to consolidated financial statements in this Annual Report on Form 10-K for a description of certain acquisitions and divestitures. On June 1, 2015, we completed the sale of our wholly owned subsidiary, Concentra Inc. During 2015, 2014 and 2013, we funded certain non-regulated subsidiary acquisitions, including the acquisition of American Eldercare Inc., with contributions from Humana Inc., our parent company, included in capital contributions in the condensed statement of cash flows.

5. INCOME TAXES

Refer to Note 11 of the notes to consolidated financial statements included in this Annual Report on Form 10-K for a description of income taxes.

6. DEBT

Refer to Note 12 of the notes to consolidated financial statements included in this Annual Report on Form 10-K for a description of debt.

7. STOCKHOLDER’S EQUITY

Refer to Note 15 of the notes to consolidated financial statements included in this Annual Report on Form 10-K for a description of stockholders’ equity, including stock repurchases and stockholder dividends.

154

Humana Inc.

SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS

For the Years Ended December 31, 2015, 2014, and 2013

(in millions)

							Additions
	Balance  at Beginning of Period			Acquired/(Disposed) Balances			Charged (Credited)  to Costs and Expenses			Charged  to Other Accounts (1)			Deductions or Write-offs			Balance at End  of Period
Allowance for loss on receivables:
2015	$	137		$	(39	)	$	61		$	(7	)	$	(51	)	$	101
2014	118			—			32			28			(41		)	137
2013	94			—			37			18			(31		)	118
Deferred tax asset valuation allowance:
2015	(48		)	—			6			—			—			(42		)
2014	(28		)	—			(20		)	—			—			(48		)
2013	(28		)	—			—			—			—			(28		)

(1) Represents changes in retroactive membership adjustments to premiums revenue and contractual allowances adjustments to services revenue as more fully described in Note 2 to the consolidated financial statements included in this annual report on Form 10-K.

155

SIGNATURES

Pursuant to the requirements of Sections 13 or 15(d) of the Securities Exchange Act of 1934, the Company has duly caused this report to be signed on its behalf by the undersigned, thereto duly authorized.

HUMANA INC.
By:	/s/    BRIAN A. KANE
	Brian A. Kane
	Senior Vice President and Chief Financial Officer  (Principal Financial Officer)
Date:	February 18, 2016

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Company and in the capacities and on the date indicated.

Signature	Title	Date
/s/    BRIAN A. KANE	Senior Vice President and Chief Financial Officer (Principal Financial Officer)	February 18, 2016
Brian A. Kane
/s/    CYNTHIA H. ZIPPERLE	Vice President, Chief Accounting Officer and Controller (Principal Accounting Officer)	February 18, 2016
Cynthia H. Zipperle
/s/    BRUCE D. BROUSSARD	President and Chief Executive Officer, Director (Principal Executive Officer)	February 18, 2016
Bruce D. Broussard
/s/    KURT J. HILZINGER	Chairman of the Board	February 18, 2016
Kurt J. Hilzinger
/s/    FRANK A. D’AMELIO	Director	February 18, 2016
Frank A. D’Amelio
/s/    W. ROY DUNBAR	Director	February 18, 2016
W. Roy Dunbar
/s/    DAVID A. JONES, JR.	Director	February 18, 2016
David A. Jones, Jr.
/s/    WILLIAM J. MCDONALD	Director	February 18, 2016
William J. McDonald
/s/    WILLIAM E. MITCHELL	Director	February 18, 2016
William E. Mitchell
/s/    DAVID B. NASH, M.D.	Director	February 18, 2016
David B. Nash, M.D.
/s/    JAMES J. O’BRIEN	Director	February 18, 2016
James J. O’Brien
/s/    MARISSA T. PETERSON	Director	February 18, 2016
Marissa T. Peterson

156

EX-10.A

HUMANA INC.

RSU – NCNS - RE

RESTRICTED STOCK UNIT AGREEMENT

AND AGREEMENT NOT TO COMPETE OR SOLICIT

UNDER THE 2011 STOCK INCENTIVE PLAN

THIS RESTRICTED STOCK UNIT AGREEMENT ("Agreement") made as of <award_date>(the “Date of Grant”) by and between HUMANA INC., a corporation duly organized and existing under the laws of the State of Delaware (hereinafter referred to as the "Company"), and <first_name> <middle_name> <last_name>, an employee of the Company (hereinafter referred to as "Grantee").

WITNESSETH:

WHEREAS, the Humana Inc. 2011 Stock Incentive Plan (the "Plan") was approved by the Company's Board of Directors (the "Board") and stockholders; and

WHEREAS, the Company desires to award to Grantee Restricted Stock Units in accordance with the Plan.

NOW, THEREFORE, in consideration of the award of Restricted Stock Units to Grantee, the promises and mutual covenants hereinafter set forth, and other good and valuable consideration, the Company and Grantee agree as follows:

I.    RESTRICTED STOCK UNIT GRANT

A.Grant. Subject to the terms and conditions hereinafter set forth, and in accordance with the provisions of the Plan, the Company hereby grants to Grantee, and Grantee hereby accepts from the Company <shares_awarded> Restricted Stock Units. Each Restricted Stock Unit represents the right of the Grantee to receive (i) one (1) Share on the date of distribution provided for in Section 1.E. In addition, the Grantee shall also have the right to receive all of the cash or in-kind dividends that are paid with respect to the Shares represented by the Restricted Stock Units to which this award relates (“DERs”). Dividend equivalents with respect to any such Share shall be paid on the same date that such Share is issued to the Grantee pursuant to Section I.E. hereof. The DERs shall be subject to the same terms and conditions applicable to the Restricted Stock Units, including, without limitation, the restrictions and non-transferability, vesting, forfeiture and distribution provisions contained in Sections I.B through I.E., inclusive, of this Agreement. In the event that the Restricted Stock Units are forfeited pursuant to Section I.D. hereof, the related DER shall also be forfeited.

B.    Restrictions and Non-Transferability. The Restricted Stock Units and DERs may not be sold, transferred, pledged, assigned or otherwise alienated or hypothecated. In addition, such Restricted Stock Units and DERs shall be subject to forfeiture in accordance with the provisions of Section I.D.

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C.    Vesting of Restricted Stock Units. The Restricted Stock Units shall vest in three equal installments, with the first installment vesting on December 15 of the year in which the Date of Grant occurs, and the next two installments vesting on December 15 of each of the next two years (each such date, a “Vesting Date” and the period between each Vesting Date, a “Vesting Period”); provided, however, that (i) all of the unvested Restricted Stock Units and DERs will immediately vest on (A) the date of termination due to the death of the Grantee or (B) the date of termination of the Grantee’s employment by the Company or its applicable affiliate for any reason other than Cause, or by the Grantee with Good Reason (as defined below), in each case within two (2) years following a Change in Control (a “Change in Control Termination”), if such termination of employment occurs prior to a Vesting Date or (ii) upon the termination of the Grantee’s employment due to Retirement, a prorated portion of the Restricted Stock Units (and related DERs) that would have vested on the next scheduled Vesting Date shall vest on the next scheduled Vesting Date, with the proration to be determined by calculating the product of (A) the quotient of (x) the number of completed months the Grantee has been employed since the Date of Grant or the most recent Vesting Date, as applicable, divided by (y) the number of months in the current restricted Vesting Period, multiplied by (B) the total number of Restricted Stock Units that were scheduled to vest on the next scheduled Vesting Date. For purposes of the foregoing calculation, a month is complete on the day in the following month that corresponds to the Date of Grant. For the purposes of this Agreement, “Good Reason” means, (a) if the Grantee is a party to an employment or a severance agreement with the Company or one of its Subsidiaries in which “Good Reason” is defined, the occurrence of any circumstances defined as “Good Reason” in such employment or severance agreement, or (b) if the Grantee is not a party to an employment or severance agreement with the Company or one of the Subsidiaries in which “Good Reason” is defined, the relocation of the Grantee’s office at which the Grantee is to perform his or her duties to a location more than thirty (30) miles from the location at which the Grantee performed his or her duties prior to the Change in Control.

D.Forfeiture.    Upon the termination of Grantee's employment with the Company prior to the time the Restricted Stock Units have vested pursuant to Section I.C., other than a termination in the event of Grantee’s Retirement, death, Disability or a Change in Control Termination, the Restricted Stock Units and DERs shall thereupon be forfeited immediately by Grantee. In the event of Grantee’s Retirement a prorated portion of the Restricted Stock Units and DERs that would have vested on the next Vesting Date shall vest in accordance with Section I.C.(ii) and the Grantee shall forfeit the remaining unvested portion of the Restricted Stock Units and DERs; provided, however, that the Committee may determine, in its sole discretion, that some or all of the unvested Restricted Stock Units and DERs held by the Grantee that would otherwise be forfeited as of the date of Retirement shall vest. For the avoidance of doubt, no Restricted Stock Units or DERs shall be forfeited upon Grantee’s termination of employment due to Disability, with such Restricted Stock Units and DERs continuing to vest in accordance with the Vesting Dates provided in Section I.C.

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E.Distributions. The Company shall issue to Grantee (or, if applicable, the Grantee’s estate or personal representative) Shares (or such other securities or other property into which the Shares have been converted, with any partial Shares or other securities to be settled in cash) with respect to the Grantee’s Restricted Stock Units and dividend equivalents accrued pursuant to the DERs with respect to such Restricted Stock Units, within 30 days of the date that the Restricted Stock Units vest in accordance with Section I.C hereof; provided, however, that, to the extent that the Restricted Stock Units are considered deferred compensation subject to Section 409A of the Code and the Restricted Stock Units vest in connection with the Grantee’s Change in Control Termination, then unless the Change in Control is a Section 409A Change in Control, the distribution of Shares (or such other securities or other property into which the Shares have been converted) shall not be accelerated to the vesting date but such distribution shall instead occur based on the Vesting Dates set forth in Section I.C. hereof. A “Section 409A Change in Control” shall mean a Change in Control that also constitutes a “change in ownership or effective control” of the Company or a “change in ownership of a substantial portion of the assets of” the Company, in each case within the meaning of Section 409A of the Code. Notwithstanding anything to the contrary contained herein, no Shares may be transferred to any person other than the Grantee unless such other person demonstrates to the reasonable satisfaction of the Company such person’s right to the transfer.

F.    Taxes. Federal, state and local income and employment taxes and other amounts as may be required by law to be collected by the Company (“Withholding Taxes”) in connection with the distribution of Shares, cash or other property or, to the extent applicable, vesting of the Restricted Stock Units or DERs hereunder, shall be paid by Grantee at such time. Notwithstanding the foregoing, the Company shall withhold delivery of a number of Shares with a Fair Market Value as of the distribution date equal to the Withholding Taxes required to be withheld in connection with such distribution.

II.    AGREEMENT NOT TO COMPETE AND AGREEMENT NOT TO SOLICIT. Grantee acknowledges that Grantee’s continued employment with the Company and the grant of the Restricted Stock Units evidenced hereby is sufficient consideration for this Agreement, including, without limitation, the restrictions imposed by this Section II.

A.    Agreement Not To Compete. Grantee hereby covenants and agrees that for a period commencing on the date hereof and ending twelve (12) months after the effective date of Grantee's termination of employment with the Company, Grantee shall not, directly or indirectly, personally, or as an employee, officer, director, partner, member, owner, material shareholder, investor or principal of, or consultant or independent contractor with, another entity, engage in business with, be employed by, or render any consultation or business advice or other services with respect to, any

- 3 -

business which provides or offers products or services which compete with any Company Business, in any geographic areas in which the Company and/or any of its affiliates is then currently doing Company Business.

B.    Agreement Not To Solicit. Grantee hereby covenants and agrees that for a period commencing on the date hereof and ending twelve (12) months after the effective date of Grantee's termination of employment with the Company, Grantee, directly or indirectly, personally, or as an employee, officer, director, partner, member, owner, material shareholder, investor or principal of, or consultant or independent contractor with, another entity, shall not:

1.    Interfere with the relationship of the Company and/or any of its affiliates and any of its employees, agents, representatives, consultants or advisors.

2.    Divert, or attempt to cause the diversion from the Company and/or any of its affiliates, any Company Business, nor interfere with relationships of the Company and/or any of its affiliates with its policyholders, agents, brokers, dealers, distributors, marketers, sources of supply or customers.

3.    Solicit, recruit or otherwise induce or influence any employee of the Company and/or any of its affiliates to accept employment in any business which competes with the Company Business, in any of the geographic areas in which the Company and/or any of its affiliates is then currently doing Company Business.

C.Definitions.

For purposes of Sections II.A and B, the following definitions apply.

1.    “Company Business” shall mean any business related to a service or product offered by the Company and/or any of its affiliates during the two-year period immediately preceding the Grantee’s termination date that Grantee engaged in or rendered any consultation or business advice or other services with respect to, during Grantee’s employment with the Company and/or any of its affiliates.

2    “Geographic area” shall mean any state, commonwealth or territory of the United States or any equivalent entity in any foreign country.

D.    Effect of Termination of Employment other than a Change in Control Termination on Agreements Not to Compete and Not to Solicit.

1.    In the event Grantee voluntarily resigns or is discharged by Company with Cause at any time prior to the vesting of the Restricted Stock Unit, the prohibitions on Grantee set forth in Sections II.A and II.B shall remain in full force and effect.

2.    In the event Grantee is discharged by Company other than with Cause prior to the vesting herein of the Restricted Stock Unit, the prohibitions set forth in Section II.A shall remain in full force and effect only if the Company, solely at its option, pays to Grantee an amount at least equal to Grantee's then current annual base salary, whether such amount is paid pursuant to this provision or pursuant to any other severance or separation plan or other plan or agreement between Grantee and Company.

- 4 -

3.    In the event Grantee is discharged by Company other than with Cause prior to vesting herein of the Restricted Stock Unit, the prohibitions set forth in Section II.B above shall remain in full force and effect.

4.    After the vesting of the Restricted Stock Unit, the prohibitions on Grantee set forth herein shall remain in full force and effect, except as otherwise provided in Section II.E.

E.    Effect Of a Change In Control Termination on Agreements Not to Compete and Not to Solicit.

1.    Notwithstanding anything set forth in Section II.D., in the event of a Change in Control Termination, the prohibitions on Grantee set forth in Section II.A shall remain in full force and effect only if the acquirer or successor to the Company following the Change in Control shall, solely at its option, pay, within thirty (30) days following Grantee's employment termination date with the Company or its successor, to the Grantee the Non-Compete Payment. Notwithstanding any previous agreement between Grantee and the Company relating to the prohibitions on Grantee set forth in Section II.A and, to the extent Grantee has previously been granted equity awards pursuant to the Plan (“Prior Awards”), from the date hereof until the earlier of (a) two years following the closing of the merger of the Company with Aetna Inc., pursuant to that certain Agreement and Plan of Merger dated as of July 2, 2015, among Aetna Inc., Echo Merger Sub, Inc., Echo Merger Sub, LLC and Humana Inc. (the “Aetna Merger Agreement”), and (b) termination of the Aetna Merger Agreement (such earlier date, the “Trigger Date”), the “Non-Compete Payment” shall be an amount at least equal to Grantee's then current annual base salary, plus Grantee's maximum potential bonus pursuant to any bonus plan in which Grantee participated as of the date of the Change in Control. From and after the Trigger Date, or, if Grantee has not been granted Prior Awards, at any time, the “Non-Compete Payment” shall be an amount at least equal to Grantee’s then current annual base salary, plus Grantee’s target potential bonus pursuant to any bonus plan in which Grantee participated as of the date of the Change in Control. Such sums shall be in addition to any other amounts paid or payable to Grantee with respect to other change in control agreements. For the avoidance of doubt, the provisions of this Section IIE shall supersede any agreement between Grantee and the Company relating to the prohibitions on Grantee set forth in Section II.A, with the exception of any similar agreement contained in (i) any employment agreement between Grantee and the Company, or (ii) any agreement between Grantee and the Company not related to the employment of Grantee by the Company.

2.    In the event of a Change in Control Termination, the prohibitions on Grantee set forth in Section II.B. shall remain in full force and effect.

F.    Governing Law. Notwithstanding any other provision herein to the contrary, the provisions of this Section II of the Agreement, shall be governed by, and construed in accordance with, the laws of the Commonwealth of Kentucky without regard to its conflicts or choice of laws rules or principles that might otherwise refer construction or interpretation of this Section II to the substantive law of another jurisdiction.

G.    Injunctive Relief; Invalidity of Any Provision. Grantee acknowledges that (1) his or her services to the Company are of a special, unique and extraordinary character, (2) his or her position with the Company will

- 5 -

place him or her in a position of confidence and trust with respect to the operations of the Company, (3) he or she will benefit from continued employment with the Company, (4) the nature and periods of restrictions imposed by the covenants contained in this Section II hereof are fair, reasonable and necessary to protect the Company, (5) the Company would sustain immediate and irreparable loss and damage if Grantee were to breach any of such covenants, and (6) the Company’s remedy at law for such a breach will be inadequate. Accordingly, Grantee agrees and consents that the Company, in addition to the recovery of damages and all other remedies available to it, at law or in equity, shall be entitled to seek both preliminary and permanent injunctions to prevent and/or halt a breach or threatened breach by Grantee of any covenant contained in Section II hereof. If any provision of this Section II is determined by a court of competent jurisdiction to be invalid in whole or in part, it shall be deemed to have been amended, whether as to time, area covered or otherwise, as and to the extent required for its validity under applicable law, and as so amended, shall be enforceable. The parties further agree to execute all documents necessary to evidence such amendment.

III.    MISCELLANEOUS PROVISIONS

A.    Binding Effect & Adjustment.    This Agreement shall be binding and conclusive upon each successor and assign of the Company. Grantee’s obligations hereunder shall not be assignable to any other person or entity. It is the intent of the parties to this Agreement that the benefits of any appreciation of the underlying Common Stock during the term of the Award shall be preserved in any event, including but not limited to a recapitalization, merger, consolidation, reorganization, stock dividend, stock split, reverse stock split, spin-off or similar transaction, or other change in corporate structure affecting the Shares, as more fully described in Sections 4.6 and 11 of the Plan. All obligations imposed upon Grantee and all rights granted to Grantee and to the Company shall be binding upon Grantee's heirs and legal representatives.

B.    Amendment. This Agreement may only be amended by a writing executed by each of the parties hereto.

C.    Governing Law. Except as to matters of federal law and the provisions of Section II hereof, this Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware without regard to its conflict of laws rules. This Agreement shall also be governed by, and construed in accordance with, the terms of the Plan.

D.No Employment Agreement. Nothing herein confers on the Grantee any rights with respect to the continuance of employment or other service with the Company, nor will it interfere with any right the Company would otherwise have to terminate or modify the terms of Grantee's employment or other service at any time.

E.    Severability. If any provision of this Agreement is or becomes or is deemed invalid, illegal or unenforceable in any relevant jurisdiction, or would disqualify this Award under any law deemed applicable by the Committee, such provision shall be construed or deemed amended to conform to applicable laws or if it cannot be

- 6 -

construed or deemed amended without, in the determination of the Committee, materially altering the intent of the Plan, it shall be stricken and the remainder of the Agreement shall remain in full force and effect.

F.    Defined Terms. Any term used herein and not otherwise defined herein shall have the same meaning as in the Plan. Any conflict between this Agreement and the Plan will be resolved in favor of the Plan.Any disputes or questions of right or obligation which shall result from or relate to any interpretation of this Agreement shall be determined by the Committee. Any such determination shall be binding and conclusive upon Grantee and any person or persons claiming through Grantee as to any rights hereunder.

G.    Execution. If Grantee shall fail to execute this Agreement, either manually with a paper document, or through the online grant agreement procedure with the Company’s designated broker–dealer, and, if manually executed, return the executed original to the Secretary of the Company, the Award shall be null and void. The choice of form will be at the Company’s discretion.

F.    Section 409A.  All Restricted Stock Units granted pursuant to this Agreement are intended either to be exempt from Section 409A of the Code, or, if subject to Section 409A of the Code, to be administered, operated and construed in compliance with Section 409A of the Code and any guidance issued thereunder. This Agreement and the Plan shall be administered in a manner consistent with this intent and any provision that would cause the Agreement or Plan to fail to satisfy the first sentence of this section shall have no force and effect. Notwithstanding anything contained herein to the contrary, Restricted Stock Units (and related DERs) that (a) constitute “nonqualified deferred compensation” as defined under Section 409A of the Code and (b) vest as a consequence of the Grantee’s termination of employment, shall not be delivered until the date that the Grantee incurs a “separation from service” within the meaning of Section 409A of the Code (or, if the Grantee is a “specified employee” within the meaning of Section 409A of the Code and any guidance issued thereunder, the date that is six months and one day following the date of such “separation from service” (or on the date of the Grantee’s death, if earlier)). In addition, each amount to be paid or benefit to be provided to the Grantee pursuant to this Agreement that constitutes deferred compensation subject to Section 409A of the Code, shall be construed as a separate identified payment for purposes of Section 409A of the Code.

- 7 -

IN WITNESS WHEREOF, Company has caused this Agreement to be executed on its behalf by its duly authorized officer, and Grantee has executed this Agreement, each as of the day first above written.

		"Company"
ATTEST:		HUMANA INC.
BY:	/s/ JOAN O. LENAHAN	BY:	/s/ BRUCE D. BROUSSARD
	JOAN O. LENAHAN		BRUCE D. BROUSSARD
	Vice President and Corporate Secretary		President & Chief Executive Officer
		“Grantee”
		<first_name><middle_name><last_name>

- 8 -

EX-10.B

HUMANA INC.

RSU – NCNS – NO RE

RESTRICTED STOCK UNIT AGREEMENT

AND AGREEMENT NOT TO COMPETE OR SOLICIT

UNDER THE 2011 STOCK INCENTIVE PLAN

THIS RESTRICTED STOCK UNIT AGREEMENT ("Agreement") made as of <award_date>(the “Date of Grant”) by and between HUMANA INC., a corporation duly organized and existing under the laws of the State of Delaware (hereinafter referred to as the "Company"), and <first_name> <middle_name> <last_name>, an employee of the Company (hereinafter referred to as "Grantee").

WITNESSETH:

WHEREAS, the Humana Inc. 2011 Stock Incentive Plan (the "Plan") was approved by the Company's Board of Directors (the "Board") and stockholders; and

WHEREAS, the Company desires to award to Grantee Restricted Stock Units in accordance with the Plan.

NOW, THEREFORE, in consideration of the award of Restricted Stock Units to Grantee, the promises and mutual covenants hereinafter set forth, and other good and valuable consideration, the Company and Grantee agree as follows:

I.    RESTRICTED STOCK UNIT GRANT

A.Grant. Subject to the terms and conditions hereinafter set forth, and in accordance with the provisions of the Plan, the Company hereby grants to Grantee, and Grantee hereby accepts from the Company <shares_awarded> Restricted Stock Units. Each Restricted Stock Unit represents the right of the Grantee to receive (i) one (1) Share on the date of distribution provided for in Section 1.E. In addition, the Grantee shall also have the right to receive all of the cash or in-kind dividends that are paid with respect to the Shares represented by the Restricted Stock Units to which this award relates (“DERs”). Dividend equivalents with respect to any such Share shall be paid on the same date that such Share is issued to the Grantee pursuant to Section I.E. hereof. The DERs shall be subject to the same terms and conditions applicable to the Restricted Stock Units, including, without limitation, the restrictions and non-transferability, vesting, forfeiture and distribution provisions contained in Sections I.B through I.E., inclusive, of this Agreement. In the event that the Restricted Stock Units are forfeited pursuant to Section I.D. hereof, the related DER shall also be forfeited.

B.    Restrictions and Non-Transferability. The Restricted Stock Units and DERs may not be sold, transferred, pledged, assigned or otherwise alienated or hypothecated. In addition, such Restricted Stock Units and DERs shall be subject to forfeiture in accordance with the provisions of Section I.D.

- 1 -

C.    Vesting of Restricted Stock Units. The Restricted Stock Units shall vest in three equal annual installments, with the first annual installment vesting on the first anniversary of the Date of Grant, and the next two annual installments vesting on each of the next two anniversaries of the Date of Grant (each such date, a “Vesting Date”); provided, however, that all of the unvested Restricted Stock Units and DERs will immediately vest on (i) the date of termination due to the death of the Grantee or (ii) the date of termination of the Grantee’s employment by the Company or its applicable affiliate for any reason other than Cause, or by the Grantee with Good Reason (as defined below), in each case within two (2) years following a Change in Control (a “Change in Control Termination”), if such termination of employment occurs prior to a Vesting Date. For purposes of the foregoing calculation, a month is complete on the day in the following month that corresponds to the Date of Grant. For the purposes of this Agreement, “Good Reason” means, (a) if the Grantee is a party to an employment or a severance agreement with the Company or one of its Subsidiaries in which “Good Reason” is defined, the occurrence of any circumstances defined as “Good Reason” in such employment or severance agreement, or (b) if the Grantee is not a party to an employment or severance agreement with the Company or one of the Subsidiaries in which “Good Reason” is defined, the relocation of the Grantee’s office at which the Grantee is to perform his or her duties to a location more than thirty (30) miles from the location at which the Grantee performed his or her duties prior to the Change in Control.

D.Forfeiture.    Upon the termination of Grantee's employment with the Company prior to the time the Restricted Stock Units have vested pursuant to Section I.C., other than a termination in the event of Grantee’s death, Disability or a Change in Control Termination, the Restricted Stock Units and DERs shall thereupon be forfeited immediately by Grantee. For the avoidance of doubt, no Restricted Stock Units or DERs shall be forfeited upon Grantee’s termination of employment due to Disability, with such Restricted Stock Units and DERs continuing to vest in accordance with the Vesting Dates provided in Section I.C.

E.Distributions. The Company shall issue to Grantee (or, if applicable, the Grantee’s estate or personal representative) Shares (or such other securities or other property into which the Shares have been converted, with any partial Shares or other securities to be settled in cash) with respect to the Grantee’s Restricted Stock Units and dividend equivalents accrued pursuant to the DERs with respect to such Restricted Stock Units, within 30 days of the date that the Restricted Stock Units vest in accordance with Section I.C hereof; provided, however, that, to the extent that the Restricted Stock Units are considered deferred compensation subject to Section 409A of the Code and the Restricted Stock Units vest in connection with the Grantee’s Change in Control Termination, then unless the Change in Control is a Section 409A Change in Control, the distribution of Shares (or such other securities or other property into which the Shares have been converted) shall not be accelerated to the vesting date but such distribution shall instead occur based on the Vesting Dates set forth in Section I.C. hereof. A “Section 409A Change in Control” shall mean a Change in Control that also constitutes a “change in ownership or effective control” of the Company or a “change in ownership of a substantial portion of the assets of” the Company, in each case within the meaning of Section 409A of the Code.

- 2 -

Notwithstanding anything to the contrary contained herein, no Shares may be transferred to any person other than the Grantee unless such other person demonstrates to the reasonable satisfaction of the Company such person’s right to the transfer.

F.    Taxes. Federal, state and local income and employment taxes and other amounts as may be required by law to be collected by the Company (“Withholding Taxes”) in connection with the distribution of Shares, cash or other property or, to the extent applicable, vesting of the Restricted Stock Units or DERs hereunder, shall be paid by Grantee at such time. Notwithstanding the foregoing, the Company shall withhold delivery of a number of Shares with a Fair Market Value as of the distribution date equal to the Withholding Taxes required to be withheld in connection with such distribution.

II.    AGREEMENT NOT TO COMPETE AND AGREEMENT NOT TO SOLICIT. Grantee acknowledges that Grantee’s continued employment with the Company and the grant of the Restricted Stock Units evidenced hereby is sufficient consideration for this Agreement, including, without limitation, the restrictions imposed by this Section II.

A.    Agreement Not To Compete. Grantee hereby covenants and agrees that for a period commencing on the date hereof and ending twelve (12) months after the effective date of Grantee's termination of employment with the Company, Grantee shall not, directly or indirectly, personally, or as an employee, officer, director, partner, member, owner, material shareholder, investor or principal of, or consultant or independent contractor with, another entity, engage in business with, be employed by, or render any consultation or business advice or other services with respect to, any business which provides or offers products or services which compete with any Company Business, in any geographic areas in which the Company and/or any of its affiliates is then currently doing Company Business.

B.    Agreement Not To Solicit. Grantee hereby covenants and agrees that for a period commencing on the date hereof and ending twelve (12) months after the effective date of Grantee's termination of employment with the Company, Grantee, directly or indirectly, personally, or as an employee, officer, director, partner, member, owner, material shareholder, investor or principal of, or consultant or independent contractor with, another entity, shall not:

1.    Interfere with the relationship of the Company and/or any of its affiliates and any of its employees, agents, representatives, consultants or advisors.

2.    Divert, or attempt to cause the diversion from the Company and/or any of its affiliates, any Company Business, nor interfere with relationships of the Company and/or any of its affiliates with its policyholders, agents, brokers, dealers, distributors, marketers, sources of supply or customers.

3.    Solicit, recruit or otherwise induce or influence any employee of the Company and/or any of its affiliates to accept employment in any business which competes with the Company Business, in any of the geographic areas in which the Company and/or any of its affiliates is then currently doing Company Business.

C.Definitions.

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For purposes of Sections II.A and B, the following definitions apply.

1.    “Company Business” shall mean any business related to a service or product offered by the Company and/or any of its affiliates during the two-year period immediately preceding the Grantee’s termination date that Grantee engaged in or rendered any consultation or business advice or other services with respect to, during Grantee’s employment with the Company and/or any of its affiliates.

2    “Geographic area” shall mean any state, commonwealth or territory of the United States or any equivalent entity in any foreign country.

D.    Effect of Termination of Employment other than a Change in Control Termination on Agreements Not to Compete and Not to Solicit.

1.    In the event Grantee voluntarily resigns or is discharged by Company with Cause at any time prior to the vesting of the Restricted Stock Unit, the prohibitions on Grantee set forth in Sections II.A and II.B shall remain in full force and effect.

2.    In the event Grantee is discharged by Company other than with Cause prior to the vesting herein of the Restricted Stock Unit, the prohibitions set forth in Section II.A shall remain in full force and effect only if the Company, solely at its option, pays to Grantee an amount at least equal to Grantee's then current annual base salary, whether such amount is paid pursuant to this provision or pursuant to any other severance or separation plan or other plan or agreement between Grantee and Company.

3.    In the event Grantee is discharged by Company other than with Cause prior to vesting herein of the Restricted Stock Unit, the prohibitions set forth in Section II.B above shall remain in full force and effect.

4.    After the vesting of the Restricted Stock Unit, the prohibitions on Grantee set forth herein shall remain in full force and effect, except as otherwise provided in Section II.E.

E.    Effect Of a Change In Control Termination on Agreements Not to Compete and Not to Solicit.

1.    Notwithstanding anything set forth in Section II.D., in the event of a Change in Control Termination, the prohibitions on Grantee set forth in Section II.A shall remain in full force and effect only if the acquirer or successor to the Company following the Change in Control shall, solely at its option, pay, within thirty (30) days following Grantee's employment termination date with the Company or its successor, to the Grantee the Non-Compete Payment. Notwithstanding any previous agreement between Grantee and the Company relating to the prohibitions on Grantee set forth in Section II.A and, to the extent Grantee has previously been granted equity awards pursuant to the Plan (“Prior Awards”), from the date hereof until the earlier of (a) two years following the closing of the merger of the Company with Aetna Inc., pursuant to that certain Agreement and Plan of Merger dated as of July 2, 2015, among Aetna Inc., Echo Merger Sub, Inc., Echo Merger Sub, LLC and Humana Inc. (the “Aetna Merger Agreement”), and

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(b) termination of the Aetna Merger Agreement (such earlier date, the “Trigger Date”), the “Non-Compete Payment” shall be an amount at least equal to Grantee's then current annual base salary, plus Grantee's maximum potential bonus pursuant to any bonus plan in which Grantee participated as of the date of the Change in Control. From and after the Trigger Date, or, if Grantee has not been granted Prior Awards, at any time, the “Non-Compete Payment” shall be an amount at least equal to Grantee’s then current annual base salary, plus Grantee’s target potential bonus pursuant to any bonus plan in which Grantee participated as of the date of the Change in Control. Such sums shall be in addition to any other amounts paid or payable to Grantee with respect to other change in control agreements. For the avoidance of doubt, the provisions of this Section IIE shall supersede any agreement between Grantee and the Company relating to the prohibitions on Grantee set forth in Section II.A, with the exception of any similar agreement contained in (i) any employment agreement between Grantee and the Company, or (ii) any agreement between Grantee and the Company not related to the employment of Grantee by the Company.

2.    In the event of a Change in Control Termination, the prohibitions on Grantee set forth in Section II.B. shall remain in full force and effect.

F.    Governing Law. Notwithstanding any other provision herein to the contrary, the provisions of this Section II of the Agreement, shall be governed by, and construed in accordance with, the laws of the Commonwealth of Kentucky without regard to its conflicts or choice of laws rules or principles that might otherwise refer construction or interpretation of this Section II to the substantive law of another jurisdiction.

G.    Injunctive Relief; Invalidity of Any Provision. Grantee acknowledges that (1) his or her services to the Company are of a special, unique and extraordinary character, (2) his or her position with the Company will place him or her in a position of confidence and trust with respect to the operations of the Company, (3) he or she will benefit from continued employment with the Company, (4) the nature and periods of restrictions imposed by the covenants contained in this Section II hereof are fair, reasonable and necessary to protect the Company, (5) the Company would sustain immediate and irreparable loss and damage if Grantee were to breach any of such covenants, and (6) the Company’s remedy at law for such a breach will be inadequate. Accordingly, Grantee agrees and consents that the Company, in addition to the recovery of damages and all other remedies available to it, at law or in equity, shall be entitled to seek both preliminary and permanent injunctions to prevent and/or halt a breach or threatened breach by Grantee of any covenant contained in Section II hereof. If any provision of this Section II is determined by a court of competent jurisdiction to be invalid in whole or in part, it shall be deemed to have been amended, whether as to time, area covered or otherwise, as and to the extent required for its validity under applicable law, and as so amended, shall be enforceable. The parties further agree to execute all documents necessary to evidence such amendment.

III.    MISCELLANEOUS PROVISIONS

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A.    Binding Effect & Adjustment.    This Agreement shall be binding and conclusive upon each successor and assign of the Company. Grantee’s obligations hereunder shall not be assignable to any other person or entity. It is the intent of the parties to this Agreement that the benefits of any appreciation of the underlying Common Stock during the term of the Award shall be preserved in any event, including but not limited to a recapitalization, merger, consolidation, reorganization, stock dividend, stock split, reverse stock split, spin-off or similar transaction, or other change in corporate structure affecting the Shares, as more fully described in Sections 4.6 and 11 of the Plan. All obligations imposed upon Grantee and all rights granted to Grantee and to the Company shall be binding upon Grantee's heirs and legal representatives.

B.    Amendment. This Agreement may only be amended by a writing executed by each of the parties hereto.

C.    Governing Law. Except as to matters of federal law and the provisions of Section II hereof, this Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware without regard to its conflict of laws rules. This Agreement shall also be governed by, and construed in accordance with, the terms of the Plan.

D.No Employment Agreement. Nothing herein confers on the Grantee any rights with respect to the continuance of employment or other service with the Company, nor will it interfere with any right the Company would otherwise have to terminate or modify the terms of Grantee's employment or other service at any time.

E.    Severability. If any provision of this Agreement is or becomes or is deemed invalid, illegal or unenforceable in any relevant jurisdiction, or would disqualify this Award under any law deemed applicable by the Committee, such provision shall be construed or deemed amended to conform to applicable laws or if it cannot be construed or deemed amended without, in the determination of the Committee, materially altering the intent of the Plan, it shall be stricken and the remainder of the Agreement shall remain in full force and effect.

F.    Defined Terms. Any term used herein and not otherwise defined herein shall have the same meaning as in the Plan. Any conflict between this Agreement and the Plan will be resolved in favor of the Plan.Any disputes or questions of right or obligation which shall result from or relate to any interpretation of this Agreement shall be determined by the Committee. Any such determination shall be binding and conclusive upon Grantee and any person or persons claiming through Grantee as to any rights hereunder.

G.    Execution. If Grantee shall fail to execute this Agreement, either manually with a paper document, or through the online grant agreement procedure with the Company’s designated broker–dealer, and, if manually executed, return the executed original to the Secretary of the Company, the Award shall be null and void. The choice of form will be at the Company’s discretion.

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F.    Section 409A.  All Restricted Stock Units granted pursuant to this Agreement are intended either to be exempt from Section 409A of the Code, or, if subject to Section 409A of the Code, to be administered, operated and construed in compliance with Section 409A of the Code and any guidance issued thereunder. This Agreement and the Plan shall be administered in a manner consistent with this intent and any provision that would cause the Agreement or Plan to fail to satisfy the first sentence of this section shall have no force and effect. Notwithstanding anything contained herein to the contrary, Restricted Stock Units (and related DERs) that (a) constitute “nonqualified deferred compensation” as defined under Section 409A of the Code and (b) vest as a consequence of the Grantee’s termination of employment, shall not be delivered until the date that the Grantee incurs a “separation from service” within the meaning of Section 409A of the Code (or, if the Grantee is a “specified employee” within the meaning of Section 409A of the Code and any guidance issued thereunder, the date that is six months and one day following the date of such “separation from service” (or on the date of the Grantee’s death, if earlier)). In addition, each amount to be paid or benefit to be provided to the Grantee pursuant to this Agreement that constitutes deferred compensation subject to Section 409A of the Code, shall be construed as a separate identified payment for purposes of Section 409A of the Code.

IN WITNESS WHEREOF, Company has caused this Agreement to be executed on its behalf by its duly authorized officer, and Grantee has executed this Agreement, each as of the day first above written.

		"Company"
ATTEST:		HUMANA INC.
BY:	/s/ JOAN O. LENAHAN	BY:	/s/ BRUCE D. BROUSSARD
	JOAN O. LENAHAN		BRUCE D. BROUSSARD
	Vice President and Corporate Secretary		President & Chief Executive Officer
		“Grantee”
		<first_name><middle_name><last_name>

- 7 -

EX-10.JJ

HUMANA INC.

INCENTIVE STOCK OPTION AGREEMENT

UNDER THE 2011 STOCK INCENTIVE PLAN

THIS STOCK OPTION AGREEMENT (“Agreement”) made as of <award_date>(the “Grant Date”) by and between HUMANA INC., a corporation duly organized and existing under the laws of the State of Delaware (hereinafter referred to as the "Company"), and <first_name> <middle_name> <last_name>, an employee of the Company (hereinafter referred to as "Optionee").

WITNESSETH:

WHEREAS, the Humana Inc. 2011 Stock Incentive Plan (the "Plan") was approved by the Company’s Board of Directors (the "Board") and stockholders; and

WHEREAS, the Company desires to grant to Optionee an option to purchase shares of common stock of the Company in accordance with the Plan.

NOW, THEREFORE, in consideration of the premises, mutual covenants hereinafter set forth, and other good and valuable consideration, the Company and Optionee agree as follows:

1.    The Company hereby grants to Optionee, as a matter of separate inducement and agreement and not in lieu of salary or other compensation for services, an Incentive Stock Option to purchase <shares_awarded> shares of the $.16‑2/3 par value common stock of the Company ("Common Stock") at the purchase price of $<award_price> per share (the "Option") exercisable on the terms and conditions set forth herein.

2.    The term of the Option shall commence upon the date of grant, <award_date>, and shall expire on <expire_Date> (“Expiration Date”).

3.    Except as otherwise set forth herein, this Option shall be exercisable in full by Optionee or his/her personal representative per the attached schedule.

4.    A.    If the employment of Optionee by the Company is terminated for Cause, all the rights of Optionee under this Agreement, whether or not exercisable, shall terminate immediately.

B.    If the employment of Optionee is terminated for any reason other than for Cause, Retirement, death or Disability, unless otherwise specified herein, all the rights of Optionee under this Agreement then exercisable shall remain exercisable at any time within ninety (90) days after the date of such termination, but in no event beyond the Expiration Date.

C.    In the event of Optionee’s Retirement, (i) to the extent that this Option (or portion hereof) is exercisable as of the date of such Retirement, this Option (or portion hereof) shall be exercisable at any time within two (2) years after the date of Retirement, but in no event beyond the Expiration Date, and only to the extent the Option (or portion hereof) was exercisable at the date of Retirement, and (ii) to the extent that this Option (or portion hereof) is not exercisable as of the date of such Retirement, an additional portion of the Option shall immediately vest and become exercisable upon the Optionee’s Retirement, with such additional portion to be the annual increment of the Option that would have vested during the one (1) year period beginning on the date of the Optionee’s Retirement, and the portion of the Option that vests pursuant to this clause (ii) shall be exercisable at any time within two (2) years

1

following the date of Optionee’s Retirement, but in no event beyond the Expiration Date. Any portion of the Option that is not exercisable on the date of Optionee’s Retirement and could not become exercisable after taking into account the provisions of this Section I.D.3. shall be immediately forfeited upon Optionee’s Retirement.

D.    In the event of termination due to death or Disability of Optionee while in the employ of the Company, this Option shall become exercisable within 30 days of the termination due to death or Disability of Optionee and shall remain exercisable by Optionee or the person or the persons to whom those rights pass by will or by the laws of descent and distribution or, if appropriate, by the legal representative of the Optionee or the estate of the Optionee at any time within two (2) years after the date of such death or Disability.

5.    A.    This Option shall be exercisable only by written notice to the Secretary of the Company at the Company's principal executive offices, or through the on-line procedure to such broker-dealer as designated by the Company, by Optionee or his/her legal representative as herein provided. Such notice shall state the number of shares with respect to which the Option is being exercised and shall be signed by Optionee or his/her legal representative, as applicable.

B.    The purchase price shall be paid as follows:

i)    In full in cash upon the exercise of the Option; or

ii)    By tendering to the Company shares of the Common Stock of Company owned by him/her prior to the date of exercise and having an aggregate Fair Market Value equal to the cash exercise price applicable to his/her Option; or

iii)    A combination of 5(B)(i) and 5(B)(ii) above.

C.    Federal, state and local income and employment taxes and other amounts as may be required by law to be collected by the Company (“Withholding Taxes”) in connection with the exercise of this Option shall be paid pursuant to the Plan by Grantee at the time such Withholding Taxes become due. The Company shall, at the Grantee’s election, withhold delivery of a number of Shares with a Fair Market Value as of the exercise date equal to the Withholding Taxes in satisfaction of the Grantee’s obligations hereunder.

6.    The Option granted under this Agreement to Optionee may not be assigned, transferred, pledged, alienated or hypothecated in any manner during Optionee's lifetime, but shall be solely and exclusively the right of Optionee to exercise during his/her lifetime. Should Optionee attempt to assign, transfer, pledge, alienate or hypothecate this Option or any rights hereunder in any manner whatsoever, such action shall constitute a breach of the covenants hereunder and Company may terminate this Option as to any then unexercised shares.

7.    In the event of a Change in Control, if the employment of Optionee is terminated within two (2) years following the Change in Control (i) by the Company or its acquirer or successor for any reason other than Cause or (ii) by Optionee with Good Reason (as defined below) (a “Change in Control Termination”), this Option (or any option or other award for which this Option is substituted or into which this Option is converted into in connection with the Change in Control) shall become fully vested and immediately exercisable in its entirety, and this Option (or any substitute award) shall remain exercisable until the [second] anniversary of the date of the termination of the Optionee’s employment, but in no event beyond the Expiration Date. For the purposes of this Agreement, “Good Reason” means,

2

(a) if Optionee is a party to an employment or a severance agreement with the Company or one of its Subsidiaries in which “Good Reason” is defined, the occurrence of any circumstances defined as “Good Reason” in such employment or severance agreement, or (b) if Optionee is not a party to an employment or severance agreement with the Company or one of the Subsidiaries in which “Good Reason” is defined, the relocation of Optionee’s office at which Optionee is to perform his or her duties to a location more than thirty (30) miles from the location at which Optionee performed his or her duties prior to the Change in Control.

8.This Agreement shall be binding and conclusive upon each successor and assign of the Company. This Agreement may be amended only by a writing signed by each of the parties hereto. It is the intent of the parties to this Agreement that the benefits of any appreciation of the underlying Common Stock during the term of the Option shall be preserved in any event, including but not limited to a recapitalization, merger, consolidation, reorganization, stock dividend, stock split, reverse stock split, spin-off or similar transaction, or other change in corporate structure affecting the Shares, as more fully described in Sections 4.6 and 11 of the Plan. All obligations imposed upon Optionee and all rights granted to Optionee and to the Company shall be binding upon Optionee's heirs and legal representatives.

9.    Except as to matters of federal law, this Agreement shall be governed by and construed and enforced in accordance with the laws of the State of Delaware without giving effect to the conflicts of laws principles thereof.

10.    If any provision of this Agreement is or becomes or is deemed invalid, illegal or unenforceable in any relevant jurisdiction, or would disqualify the Optionee under any law deemed applicable by the Committee, such provision shall be construed or deemed amended to conform to applicable laws or if it cannot be construed or deemed amended without, in the determination of the Committee, materially altering the intent of the Plan, it shall be stricken and the remainder of the Agreement shall remain in full force and effect. Any provision in this Agreement determined by competent authority to be in conflict with 422 of the Internal Revenue Code of 1986, as amended, or its successor, in regard to qualifying this Option as an incentive stock option shall be ineffective ab initio to the extent of such conflict.

11.    Any term used herein and not otherwise defined herein shall have the same meaning as in the Plan. Any conflict between this Agreement and the Plan will be resolved in favor of the Plan. Any disputes or questions of right or obligation which shall result from or relate to any interpretation of this Agreement shall be determined by the Committee. Any such determination shall be binding and conclusive upon Optionee, his/her assigns, and any person or persons claiming through Optionee as to any rights hereunder.

3

IN WITNESS WHEREOF, Company has caused this Agreement to be executed on its behalf by its duly authorized officer, and Optionee has executed this Agreement, each as of the day first above written.

		"Company"
ATTEST:		HUMANA INC.
BY:	/s/ JOAN O. LENAHAN	BY:	/s/ BRUCE D. BROUSSARD
	JOAN O. LENAHAN		BRUCE D. BROUSSARD
	Vice President and Corporate Secretary		President & Chief Executive Officer
		“Optionee”
		<first_name><middle_name><last_name>

4

EX-10.KK

HUMANA INC.

STOCK OPTION AGREEMENT

AND AGREEMENT NOT TO COMPETE OR SOLICIT

UNDER THE 2011 STOCK INCENTIVE PLAN

THIS AGREEMENT (“Agreement”) made as of <award_date>(the “Grant Date”)by and between HUMANA INC., a corporation duly organized and existing under the laws of the State of Delaware (hereinafter referred to as the "Company"), and <first_name> <middle_name> <last_name>, an employee of the Company (hereinafter referred to as "Optionee").

WITNESSETH

WHEREAS, the Humana Inc. 2011 Stock Incentive Plan (the "Plan"), was approved by the Company’s Board of Directors (the "Board") and stockholders; and

WHEREAS, the Company desires to grant to Optionee an option to purchase shares of common stock of the Company in accordance with the Plan;

NOW, THEREFORE, in consideration of the premises and mutual covenants hereinafter set forth, and other good and valuable consideration, the Company and Optionee agree as follows:

I.    OPTION GRANT

A.    Grant of Option. The Company hereby grants to Optionee, as a matter of separate inducement and agreement and not in lieu of salary or other compensation for services, a Non-Qualified Stock Option to purchase <shares_awarded> shares of the $.16‑2/3 par value common stock of the Company ("Common Stock") at the purchase price of <award_price> per share (the "Option") exercisable on the terms and conditions set forth herein.

B.    Term. The term of the Option shall commence upon the date of grant <award_date>, and shall expire on <expire_Date> (“Expiration Date”).

C.Vesting of Option. Except as otherwise set forth herein, this Option shall be exercisable by Optionee or his/her personal representative on and after the first anniversary of the Grant Date in cumulative annual installments of one-third of the number of Shares covered hereby.

D.    Effect of Termination of Employment on Option.

1.    If the employment of Optionee by the Company is terminated for Cause, all the rights of Optionee under this Agreement, whether or not exercisable, shall terminate immediately.

2.    If the employment of Optionee is terminated for any reason other than for Cause, Retirement, death or Disability, unless otherwise specified herein, all the rights of Optionee under this Agreement then exercisable shall remain exercisable at any time within ninety (90) days after the date of such termination, but in no event beyond the Expiration Date.

3.    In the event of Optionee’s Retirement, (i) to the extent that this Option (or portion hereof) is exercisable as of the date of such Retirement, this Option (or portion hereof) shall be exercisable at any time within

1

two (2) years after the date of Retirement, but in no event beyond the Expiration Date, and only to the extent the Option (or portion hereof) was exercisable at the date of Retirement, and (ii) to the extent that this Option (or portion hereof) is not exercisable as of the date of such Retirement, an additional portion of the Option shall immediately vest and become exercisable upon the date of Optionee’s Retirement, with such additional portion to be the annual increment of the Option that would have vested during the one (1) year period beginning on the date of the Optionee’s Retirement, and the portion of the Option that vests pursuant to this clause (ii) shall be exercisable at any time within two (2) years following the date of Optionee’s Retirement, but in no event beyond the Expiration Date. Any portion of the Option that is not exercisable on the date of Optionee’s Retirement and could not become exercisable after taking into account the provisions of this Section I.D.3. shall be immediately forfeited upon Optionee’s Retirement.

4.    In the event of termination due to death or Disability of Optionee while in the employ of the Company, this Option shall become exercisable within 30 days of the termination due to death or Disability of Optionee and shall remain exercisable by Optionee or the person or the persons to whom those rights pass by will or by the laws of descent and distribution or, if appropriate, by the legal representative of Optionee or the estate of Optionee at any time within two (2) years after the date of such death or Disability, regardless of the Expiration Date.

5.    In the event of a Change in Control, if the employment of Optionee is terminated within two (2) years following the Change in Control (i) by the Company or its acquirer or successor for any reason other than Cause or (ii) by Optionee with Good Reason (as defined below) (a “Change in Control Termination”), this Option (or any option or other award for which this Option is substituted or into which this Option is converted into in connection with the Change in Control) shall become fully vested and immediately exercisable in its entirety, and this Option (or any substitute award) shall remain exercisable until the second anniversary of the date of the termination of the Optionee’s employment, but in no event beyond the Expiration Date. For the purposes of this Agreement, “Good Reason” means, (a) if Optionee is a party to an employment or a severance agreement with the Company or one of its Subsidiaries in which “Good Reason” is defined, the occurrence of any circumstances defined as “Good Reason” in such employment or severance agreement, or (b) if Optionee is not a party to an employment or severance agreement with the Company or one of the Subsidiaries in which “Good Reason” is defined, the relocation of Optionee’s office at which Optionee is to perform his or her duties to a location more than thirty (30) miles from the location at which Optionee performed his or her duties prior to the Change in Control.

E.    Exercise of Option.

1.    This Option shall be exercisable only by written notice to the Secretary of the Company at the Company's principal executive offices, or through the on-line procedure to such broker-dealer as designated by the Company, by Optionee or his/her legal representative as herein provided. Such notice shall state the number of shares with respect to which the Option is being exercised and shall be signed, or authorized electronically, by Optionee or his/her legal representative, as applicable.

2.    The purchase price shall be paid as follows:

a)    In full in cash upon the exercise of the Option; or

2

b)    By tendering to the Company shares of the Common Stock of Company owned by him/her prior to the date of exercise and having an aggregate fair market value equal to the cash exercise price applicable to his/her Option

c)    A combination of I.E.(2)(a) and I.E.(2)(b) above; or

d)    Through the cashless exercise provisions of the designated broker-dealer as described in the procedures communicated to Optionee by the Company.

3.    Federal, state and local income and employment taxes and other amounts as may be required by law to be collected by the Company (“Withholding Taxes”) in connection with the exercise of this Option shall be paid pursuant to the Plan by Optionee prior to the delivery of any Common Stock under this Agreement. The Company shall, at Optionee’s election, withhold delivery of a number of Shares with a Fair Market Value as of the exercise date equal to the Withholding Taxes in satisfaction of Optionee’s obligations hereunder.

II.    AGREEMENT NOT TO COMPETE AND AGREEMENT NOT TO SOLICIT. Optionee acknowledges that Optionee’s continued employment with the Company and the grant of the Options evidenced hereby is sufficient consideration for this Agreement, including, without limitation, the restrictions imposed by this Section II.

A.    Agreement Not To Compete. Optionee hereby covenants and agrees that for a period commencing on the Grant Date and ending twelve (12) months after the effective date of Optionee's termination of employment with the Company, Optionee shall not, directly or indirectly, personally, or as an employee, officer, director, partner, member, owner, material shareholder, investor or principal of, or consultant or independent contractor with, another entity, engage in business with, be employed by, or render any consultation or business advice or other services with respect to, any business which provides or offers products or services which compete with any Company Business, in any geographic areas in which the Company and/or any of its affiliates is then currently doing Company Business.

B.    Agreement Not To Solicit. Optionee hereby covenants and agrees that for a period commencing on the Grant Date and ending twelve (12) months after the effective date of Optionee's termination of employment with the Company, Optionee, directly or indirectly, personally, or as an employee, officer, director, partner, member, owner, material shareholder, investor or principal of, or consultant or independent contractor with, another entity, shall not:

1.    Interfere with the relationship of the Company and/or any of its affiliates and any of its employees, agents, representatives, consultants or advisors.

2.    Divert, or attempt to cause the diversion from the Company and/or any of its affiliates, any Company Business, nor interfere with relationships of the Company and/or any of its affiliates with its policyholders, agents, brokers, dealers, distributors, marketers, sources of supply or customers.

3.    Solicit, recruit or otherwise induce or influence any employee of the Company and/or any of its affiliates to accept employment in any business which competes with the Company Business, in any of the geographic areas in which the Company and/or any of its affiliates is then currently doing Company Business.

C.Definitions. For purposes of Sections II.A and B, the following definitions apply.

3

1.    “Company Business” shall mean any business related to a service or product offered by the Company and/or any of its affiliates during the two-year period immediately preceding the Optionee’s termination date that Optionee engaged in or rendered any consultation or business advice or other services with respect to, during Optionee’s employment with the Company and/or any of its affiliates.

2    “Geographic area” shall mean any state, commonwealth or territory of the United States or any equivalent entity in any foreign country.

D.    Effect of Termination of Employment other than a Change in Control Termination on Agreements Not to Compete and Not to Solicit.

1.    In the event Optionee voluntarily resigns or is discharged by Company with Cause at any time prior to the vesting of the Option, the prohibitions on Optionee set forth in Sections II.A and II.B shall remain in full force and effect.

2.    In the event Optionee is discharged by Company other than with Cause prior to the vesting herein of the Option, the prohibitions set forth in Section II.A shall remain in full force and effect only if the Company, solely at its option, pays to Optionee an amount at least equal to Optionee's then current annual base salary, whether such amount is paid pursuant to this provision or pursuant to any other severance or separation plan or other plan or agreement between Optionee and Company.

3.    In the event Optionee is discharged by Company other than with Cause prior to vesting herein of the Option, the prohibitions set forth in Section II.B above shall remain in full force and effect.

4.    After the vesting of the Option, the prohibitions on Optionee set forth herein shall remain in full force and effect, except as otherwise provided in Section II.E.

E.    Effect of a Change in Control Termination on Agreements Not to Compete and Not to Solicit.

1.    Notwithstanding anything set forth in Section II.D., in the event of a Change in Control Termination, the prohibitions on Optionee set forth in Section II.A shall remain in full force and effect only if the acquirer or successor to the Company following the Change in Control shall, solely at its option, pay, within thirty (30) days following Optionee's employment termination date with the Company or its successor, to the Optionee the Non-Compete Payment. Notwithstanding any previous agreement between Optionee and the Company relating to the prohibitions set forth in Section II.A and, to the extent Optionee has previously been granted equity award agreements pursuant to the Plan (“Prior Awards”), from the date hereof until the earlier of (a) two years following the closing of the merger of the Company with Aetna Inc., pursuant to that certain Agreement and Plan of Merger dated as of July 2, 2015, among Aetna Inc., Echo Merger Sub, Inc., Echo Merger Sub, LLC and Humana Inc. (the “Aetna Merger Agreement”), and (b) termination of the Aetna Merger Agreement (such earlier date, the “Trigger Date”), the “Non-Compete Payment” shall be an amount at least equal to Optionee's then current annual base salary, plus Optionee’s maximum potential bonus pursuant to any bonus plan in which Optionee participated as of the date of the Change in Control. From and after the Trigger Date, or, if Optionee has not been granted Prior Awards, at any time, the “Non-

4

Compete Payment” shall be an amount at least equal to Optionee’s then current annual base salary, plus Optionee’s target potential bonus pursuant to any bonus plan in which Optionee participated as of the date of the Change in Control. Such sums shall be in addition to any other amounts paid or payable to Optionee with respect to other change in control agreements. For the avoidance of doubt, the provisions of this Section IIE shall supersede any agreement between Optionee and the Company relating to the prohibitions on Optionee set forth in Section II.A, with the exception of any similar agreement contained in (i) any employment agreement between Optionee and the Company, or (ii) any agreement between Optionee and the Company not related to the employment of Optionee by the Company.

2.    In the event of a Change in Control Termination, the prohibitions on Optionee set forth in Section II.B. shall remain in full force and effect.

F.    Governing Law. Notwithstanding any other provision herein to the contrary, the provisions of this Section II of the Agreement, shall be governed by, and construed in accordance with, the laws of the Commonwealth of Kentucky without regard to its conflicts or choice of laws rules or principles that might otherwise refer construction or interpretation of this Section II to the substantive law of another jurisdiction.

G.    Injunctive Relief; Invalidity of Any Provision. Optionee acknowledges that (1) his or her services to the Company are of a special, unique and extraordinary character, (2) his or her position with the Company will place him or her in a position of confidence and trust with respect to the operations of the Company, (3) he or she will benefit from continued employment with the Company, (4) the nature and periods of restrictions imposed by the covenants contained in this Section II hereof are fair, reasonable and necessary to protect the Company, (5) the Company would sustain immediate and irreparable loss and damage if Optionee were to breach any of such covenants, and (6) the Company’s remedy at law for such a breach will be inadequate. Accordingly, Optionee agrees and consents that the Company, in addition to the recovery of damages and all other remedies available to it, at law or in equity, shall be entitled to seek both preliminary and permanent injunctions to prevent and/or halt a breach or threatened breach by Optionee of any covenant contained in Section II hereof. If any provision of this Section II is determined by a court of competent jurisdiction to be invalid in whole or in part, it shall be deemed to have been amended, whether as to time, area covered or otherwise, as and to the extent required for its validity under applicable law, and as so amended, shall be enforceable. The parties further agree to execute all documents necessary to evidence such amendment.

III.    MISCELLANEOUS PROVISIONS

A.    Binding Effect & Adjustment.    This Agreement shall be binding and conclusive upon each successor and assign of the Company. Optionee’s obligations hereunder shall not be assignable to any other person or entity. It is the intent of the parties to this Agreement that the benefits of any appreciation of the underlying Common Stock during the term of the Award shall be preserved in any event, including but not limited to a recapitalization, merger, consolidation, reorganization, stock dividend, stock split, reverse stock split, spin-off or similar transaction, or other change in corporate structure affecting the Shares, as more fully described in Sections 4.6 and 11 of the Plan. All

5

obligations imposed upon Optionee and all rights granted to Optionee and to the Company shall be binding upon Optionee's heirs and legal representatives.

B.    Amendment. This Agreement may only be amended by a writing executed by each of the parties hereto.

C.    Governing Law. Except as to matters of federal law and the provisions of Section II hereof, this Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware without regard to its conflict of laws rules.

D.Jurisdiction; Service of Process. Any action or proceeding seeking to enforce any provision of, or based on any right arising out of, this Agreement may be brought against any of the parties in the courts of the Commonwealth of Kentucky, County of Jefferson, or, if it has or can acquire jurisdiction, in the United States District Court for the Western District of Kentucky, and each of the parties consents to the jurisdiction of such courts (and of the appropriate appellate courts) in any such action or proceeding and waives any objection to venue laid therein. Process in any action or proceeding referred to in the preceding sentence may be served on any party anywhere in the world.

E.No Employment Agreement. Nothing herein confers on the Optionee any rights with respect to the continuance of employment or other service with the Company, nor will it interfere with any right the Company would otherwise have to terminate or modify the terms of Optionee's employment or other service at any time.

F.    Severability. If any provision of this Agreement is or becomes or is deemed invalid, illegal or unenforceable in any relevant jurisdiction, or would disqualify this Award under any law deemed applicable by the Committee, such provision shall be construed or deemed amended to conform to applicable laws or if it cannot be construed or deemed amended without, in the determination of the Committee, materially altering the intent of the Plan, it shall be stricken and the remainder of the Agreement shall remain in full force and effect.

G.Assignment. The Option granted under this Agreement to Optionee may not be assigned, transferred, pledged, alienated or hypothecated in any manner during Optionee's lifetime, but shall be solely and exclusively the right of Optionee to exercise during his/her lifetime. Should Optionee attempt to assign, transfer, pledge, alienate or hypothecate this Option or any rights hereunder in any manner whatsoever, such action shall constitute a breach of the covenants hereunder and Company may terminate this Option as to any then unexercised shares.

H.    Defined Terms. Any term used herein and not otherwise defined herein shall have the same meaning as in the Plan. Any conflict between this Agreement and the Plan will be resolved in favor of the Plan. Any disputes or questions of right or obligation which shall result from or relate to any interpretation of this Agreement shall be determined by the Committee. Any such determination shall be binding and conclusive upon Optionee and any person or persons claiming through Optionee as to any rights hereunder.

I.    Execution. If Optionee shall fail to execute this Agreement, either manually with a paper document, or through the on-line grant agreement procedure with the Company’s designated broker–dealer, and, if manually executed, return the executed original to the Secretary of the Company, the Award shall be null and void. The choice of form will be at the Company’s discretion.

6

IN WITNESS WHEREOF, Company has caused this Agreement to be executed on its behalf by its duly authorized officer, and Optionee has executed this Agreement, each as of the day first above written.

		"Company"
ATTEST:		HUMANA INC.
BY:	/s/ JOAN O. LENAHAN	BY:	/s/ BRUCE D. BROUSSARD
	JOAN O. LENAHAN		BRUCE D. BROUSSARD
	Vice President and Corporate Secretary		President & Chief Executive Officer
		“Optionee”
		<first_name><middle_name><last_name>

7

EX-10.O

HUMANA INC.

RSU – NS - RE

RESTRICTED STOCK UNIT AGREEMENT

AND AGREEMENT NOT TO SOLICIT

UNDER THE 2011 STOCK INCENTIVE PLAN

THIS RESTRICTED STOCK UNIT AGREEMENT ("Agreement") made as of <award_date>(the “Date of Grant”) by and between HUMANA INC., a corporation duly organized and existing under the laws of the State of Delaware (hereinafter referred to as the "Company"), and <first_name> <middle_name> <last_name>, an employee of the Company (hereinafter referred to as "Grantee").

WITNESSETH:

WHEREAS, the Humana Inc. 2011 Stock Incentive Plan (the "Plan") was approved by the Company's Board of Directors (the "Board") and stockholders; and

WHEREAS, the Company desires to award to Grantee Restricted Stock Units in accordance with the Plan.

NOW, THEREFORE, in consideration of the award of Restricted Stock Units to Grantee, the promises and mutual covenants hereinafter set forth, and other good and valuable consideration, the Company and Grantee agree as follows:

I.    RESTRICTED STOCK UNIT GRANT

A.Grant. Subject to the terms and conditions hereinafter set forth, and in accordance with the provisions of the Plan, the Company hereby grants to Grantee, and Grantee hereby accepts from the Company <shares_awarded> Restricted Stock Units. Each Restricted Stock Unit represents the right of the Grantee to receive (i) one (1) Share on the date of distribution provided for in Section 1.E. In addition, the Grantee shall also have the right to receive all of the cash or in-kind dividends that are paid with respect to the Shares represented by the Restricted Stock Units to which this award relates (“DERs”). Dividend equivalents with respect to any such Share shall be paid on the same date that such Share is issued to the Grantee pursuant to Section I.E. hereof. The DERs shall be subject to the same terms and conditions applicable to the Restricted Stock Units, including, without limitation, the restrictions and non-transferability, vesting, forfeiture and distribution provisions contained in Sections I.B through I.E., inclusive, of this Agreement. In the event that the Restricted Stock Units are forfeited pursuant to Section I.D. hereof, the related DER shall also be forfeited.

B.    Restrictions and Non-Transferability. The Restricted Stock Units and DERs may not be sold, transferred, pledged, assigned or otherwise alienated or hypothecated. In addition, such Restricted Stock Units and DERs shall be subject to forfeiture in accordance with the provisions of Section I.D.

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C.    Vesting of Restricted Stock Units. The Restricted Stock Units shall vest in three equal installments, with the first installment vesting on December 15 of the year in which the Date of Grant occurs, and the next two installments vesting on December 15 of each of the next two years (each such date, a “Vesting Date” and the period between each Vesting Date, a “Vesting Period”); provided, however, that (i) all of the unvested Restricted Stock Units and DERs will immediately vest on (A) the date of termination due to the death of the Grantee or (B) the date of termination of the Grantee’s employment by the Company or its applicable affiliate for any reason other than Cause, or by the Grantee with Good Reason (as defined below), in each case within two (2) years following a Change in Control (a “Change in Control Termination”), if such termination of employment occurs prior to a Vesting Date or (ii) upon the termination of the Grantee’s employment due to Retirement, a prorated portion of the Restricted Stock Units (and related DERs) that would have vested on the next scheduled Vesting Date shall vest on the next scheduled Vesting Date, with the proration to be determined by calculating the product of (A) the quotient of (x) the number of completed months the Grantee has been employed since the Date of Grant or the most recent Vesting Date, as applicable, divided by (y) the number of months in the current restricted Vesting Period, multiplied by (B) the total number of Restricted Stock Units that were scheduled to vest on the next scheduled Vesting Date. For purposes of the foregoing calculation, a month is complete on the day in the following month that corresponds to the Date of Grant. For the purposes of this Agreement, “Good Reason” means, (a) if the Grantee is a party to an employment or a severance agreement with the Company or one of its Subsidiaries in which “Good Reason” is defined, the occurrence of any circumstances defined as “Good Reason” in such employment or severance agreement, or (b) if the Grantee is not a party to an employment or severance agreement with the Company or one of the Subsidiaries in which “Good Reason” is defined, the relocation of the Grantee’s office at which the Grantee is to perform his or her duties to a location more than thirty (30) miles from the location at which the Grantee performed his or her duties prior to the Change in Control.

D.Forfeiture.    Upon the termination of Grantee's employment with the Company prior to the time the Restricted Stock Units have vested pursuant to Section I.C., other than a termination in the event of Grantee’s Retirement, death, Disability or a Change in Control Termination, the Restricted Stock Units and DERs shall thereupon be forfeited immediately by Grantee. In the event of Grantee’s Retirement a prorated portion of the Restricted Stock Units and DERs that would have vested on the next Vesting Date shall vest in accordance with Section I.C.(ii) and the Grantee shall forfeit the remaining unvested portion of the Restricted Stock Units and DERs; provided, however, that the Committee may determine, in its sole discretion, that some or all of the unvested Restricted Stock Units and DERs held by the Grantee that would otherwise be forfeited as of the date of Retirement shall vest. For the avoidance of doubt, no Restricted Stock Units or DERs shall be forfeited upon Grantee’s termination of employment due to Disability, with such Restricted Stock Units and DERs continuing to vest in accordance with the Vesting Dates provided in Section I.C.

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E.Distributions. The Company shall issue to Grantee (or, if applicable, the Grantee’s estate or personal representative) Shares (or such other securities or other property into which the Shares have been converted, with any partial Shares or other securities to be settled in cash) with respect to the Grantee’s Restricted Stock Units and dividend equivalents accrued pursuant to the DERs with respect to such Restricted Stock Units, within 30 days of the date that the Restricted Stock Units vest in accordance with Section I.C hereof; provided, however, that, to the extent that the Restricted Stock Units are considered deferred compensation subject to Section 409A of the Code and the Restricted Stock Units vest in connection with the Grantee’s Change in Control Termination, then unless the Change in Control is a Section 409A Change in Control, the distribution of Shares (or such other securities or other property into which the Shares have been converted) shall not be accelerated to the vesting date but such distribution shall instead occur based on the Vesting Dates set forth in Section I.C. hereof. A “Section 409A Change in Control” shall mean a Change in Control that also constitutes a “change in ownership or effective control” of the Company or a “change in ownership of a substantial portion of the assets of” the Company, in each case within the meaning of Section 409A of the Code. Notwithstanding anything to the contrary contained herein, no Shares may be transferred to any person other than the Grantee unless such other person demonstrates to the reasonable satisfaction of the Company such person’s right to the transfer.

F.    Taxes. Federal, state and local income and employment taxes and other amounts as may be required by law to be collected by the Company (“Withholding Taxes”) in connection with the distribution of Shares, cash or other property or, to the extent applicable, vesting of the Restricted Stock Units or DERs hereunder, shall be paid by Grantee at such time. Notwithstanding the foregoing, the Company shall withhold delivery of a number of Shares with a Fair Market Value as of the distribution date equal to the Withholding Taxes required to be withheld in connection with such distribution.

II.    AGREEMENT NOT TO SOLICIT. Grantee acknowledges that Grantee’s continued employment with the Company and the grant of the Restricted Stock Units evidenced hereby is sufficient consideration for this Agreement, including, without limitation, the restrictions imposed by this Section II.

A.    Agreement Not To Solicit. Grantee hereby covenants and agrees that for a period commencing on the date hereof and ending twelve (12) months after the effective date of Grantee's termination of employment with the Company, Grantee, directly or indirectly, personally, or as an employee, officer, director, partner, member, owner, material shareholder, investor or principal of, or consultant or independent contractor with, another entity, shall not:

1.    Interfere with the relationship of the Company and/or any of its affiliates and any of its employees, agents, representatives, consultants or advisors.

2.    Divert, or attempt to cause the diversion from the Company and/or any of its affiliates, any Company Business, nor interfere with relationships of the Company and/or any of its affiliates with its policyholders, agents, brokers, dealers, distributors, marketers, sources of supply or customers.

- 3 -

3.    Solicit, recruit or otherwise induce or influence any employee of the Company and/or any of its affiliates to accept employment in any business which competes with the Company Business, in any of the geographic areas in which the Company and/or any of its affiliates is then currently doing Company Business.

B.Definitions.

For purposes of Section II.A, the following definitions apply.

1.    “Company Business” shall mean any business related to a service or product offered by the Company and/or any of its affiliates during the two-year period immediately preceding the Grantee’s termination date that Grantee engaged in or rendered any consultation or business advice or other services with respect to, during Grantee’s employment with the Company and/or any of its affiliates.

2    “Geographic area” shall mean any state, commonwealth or territory of the United States or any equivalent entity in any foreign country.

C.    Effect of Termination of Employment other than a Change in Control Termination on the Agreement Not to Solicit.

1.    In the event Grantee voluntarily resigns or is discharged by Company with Cause at any time prior to the vesting of the Restricted Stock Unit, the prohibitions on Grantee set forth in Sections II.A shall remain in full force and effect.

2.    In the event Grantee is discharged by Company other than with Cause prior to vesting herein of the Restricted Stock Unit, the prohibitions set forth in Section II.A above shall remain in full force and effect.

3.    After the vesting of the Restricted Stock Unit, the prohibitions on Grantee set forth herein shall remain in full force and effect.

D.    Effect Of a Change In Control Termination on Agreement Not to Solicit. In the event of a Change in Control Termination, the prohibitions on Grantee set forth in Section II.A. shall remain in full force and effect.

F.    Governing Law. Notwithstanding any other provision herein to the contrary, the provisions of this Section II of the Agreement, shall be governed by, and construed in accordance with, the laws of the Commonwealth of Kentucky without regard to its conflicts or choice of laws rules or principles that might otherwise refer construction or interpretation of this Section II to the substantive law of another jurisdiction.

G.    Injunctive Relief; Invalidity of Any Provision. Grantee acknowledges that (1) his or her services to the Company are of a special, unique and extraordinary character, (2) his or her position with the Company will place him or her in a position of confidence and trust with respect to the operations of the Company, (3) he or she will benefit from continued employment with the Company, (4) the nature and periods of restrictions imposed by the covenants contained in this Section II hereof are fair, reasonable and necessary to protect the Company, (5) the Company

- 4 -

would sustain immediate and irreparable loss and damage if Grantee were to breach any of such covenants, and (6) the Company’s remedy at law for such a breach will be inadequate. Accordingly, Grantee agrees and consents that the Company, in addition to the recovery of damages and all other remedies available to it, at law or in equity, shall be entitled to seek both preliminary and permanent injunctions to prevent and/or halt a breach or threatened breach by Grantee of any covenant contained in Section II hereof. If any provision of this Section II is determined by a court of competent jurisdiction to be invalid in whole or in part, it shall be deemed to have been amended, whether as to time, area covered or otherwise, as and to the extent required for its validity under applicable law, and as so amended, shall be enforceable. The parties further agree to execute all documents necessary to evidence such amendment.

III.    MISCELLANEOUS PROVISIONS

A.    Binding Effect & Adjustment.    This Agreement shall be binding and conclusive upon each successor and assign of the Company. Grantee’s obligations hereunder shall not be assignable to any other person or entity. It is the intent of the parties to this Agreement that the benefits of any appreciation of the underlying Common Stock during the term of the Award shall be preserved in any event, including but not limited to a recapitalization, merger, consolidation, reorganization, stock dividend, stock split, reverse stock split, spin-off or similar transaction, or other change in corporate structure affecting the Shares, as more fully described in Sections 4.6 and 11 of the Plan. All obligations imposed upon Grantee and all rights granted to Grantee and to the Company shall be binding upon Grantee's heirs and legal representatives.

B.    Amendment. This Agreement may only be amended by a writing executed by each of the parties hereto.

C.    Governing Law. Except as to matters of federal law and the provisions of Section II hereof, this Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware without regard to its conflict of laws rules. This Agreement shall also be governed by, and construed in accordance with, the terms of the Plan.

D.No Employment Agreement. Nothing herein confers on the Grantee any rights with respect to the continuance of employment or other service with the Company, nor will it interfere with any right the Company would otherwise have to terminate or modify the terms of Grantee's employment or other service at any time.

E.    Severability. If any provision of this Agreement is or becomes or is deemed invalid, illegal or unenforceable in any relevant jurisdiction, or would disqualify this Award under any law deemed applicable by the Committee, such provision shall be construed or deemed amended to conform to applicable laws or if it cannot be construed or deemed amended without, in the determination of the Committee, materially altering the intent of the Plan, it shall be stricken and the remainder of the Agreement shall remain in full force and effect.

- 5 -

F.    Defined Terms. Any term used herein and not otherwise defined herein shall have the same meaning as in the Plan. Any conflict between this Agreement and the Plan will be resolved in favor of the Plan.Any disputes or questions of right or obligation which shall result from or relate to any interpretation of this Agreement shall be determined by the Committee. Any such determination shall be binding and conclusive upon Grantee and any person or persons claiming through Grantee as to any rights hereunder.

G.    Execution. If Grantee shall fail to execute this Agreement, either manually with a paper document, or through the online grant agreement procedure with the Company’s designated broker–dealer, and, if manually executed, return the executed original to the Secretary of the Company, the Award shall be null and void. The choice of form will be at the Company’s discretion.

F.    Section 409A.  All Restricted Stock Units granted pursuant to this Agreement are intended either to be exempt from Section 409A of the Code, or, if subject to Section 409A of the Code, to be administered, operated and construed in compliance with Section 409A of the Code and any guidance issued thereunder. This Agreement and the Plan shall be administered in a manner consistent with this intent and any provision that would cause the Agreement or Plan to fail to satisfy the first sentence of this section shall have no force and effect. Notwithstanding anything contained herein to the contrary, Restricted Stock Units (and related DERs) that (a) constitute “nonqualified deferred compensation” as defined under Section 409A of the Code and (b) vest as a consequence of the Grantee’s termination of employment, shall not be delivered until the date that the Grantee incurs a “separation from service” within the meaning of Section 409A of the Code (or, if the Grantee is a “specified employee” within the meaning of Section 409A of the Code and any guidance issued thereunder, the date that is six months and one day following the date of such “separation from service” (or on the date of the Grantee’s death, if earlier)). In addition, each amount to be paid or benefit to be provided to the Grantee pursuant to this Agreement that constitutes deferred compensation subject to Section 409A of the Code, shall be construed as a separate identified payment for purposes of Section 409A of the Code.

IN WITNESS WHEREOF, Company has caused this Agreement to be executed on its behalf by its duly authorized officer, and Grantee has executed this Agreement, each as of the day first above written.

- 6 -

		"Company"
ATTEST:		HUMANA INC.
BY:	/s/ JOAN O. LENAHAN	BY:	/s/ BRUCE D. BROUSSARD
	JOAN O. LENAHAN		BRUCE D. BROUSSARD
	Vice President and Corporate Secretary		President & Chief Executive Officer
		“Grantee”
		<first_name><middle_name><last_name>

- 7 -

EX-10.Q

HUMANA INC.

RSU – NS – NO RE

RESTRICTED STOCK UNIT AGREEMENT

AND AGREEMENT NOT TO SOLICIT

UNDER THE 2011 STOCK INCENTIVE PLAN

THIS RESTRICTED STOCK UNIT AGREEMENT ("Agreement") made as of <award_date>(the “Date of Grant”) by and between HUMANA INC., a corporation duly organized and existing under the laws of the State of Delaware (hereinafter referred to as the "Company"), and <first_name> <middle_name> <last_name>, an employee of the Company (hereinafter referred to as "Grantee").

WITNESSETH:

WHEREAS, the Humana Inc. 2011 Stock Incentive Plan (the "Plan") was approved by the Company's Board of Directors (the "Board") and stockholders; and

WHEREAS, the Company desires to award to Grantee Restricted Stock Units in accordance with the Plan.

NOW, THEREFORE, in consideration of the award of Restricted Stock Units to Grantee, the promises and mutual covenants hereinafter set forth, and other good and valuable consideration, the Company and Grantee agree as follows:

I.    RESTRICTED STOCK UNIT GRANT

A.Grant. Subject to the terms and conditions hereinafter set forth, and in accordance with the provisions of the Plan, the Company hereby grants to Grantee, and Grantee hereby accepts from the Company <shares_awarded> Restricted Stock Units. Each Restricted Stock Unit represents the right of the Grantee to receive (i) one (1) Share on the date of distribution provided for in Section 1.E. In addition, the Grantee shall also have the right to receive all of the cash or in-kind dividends that are paid with respect to the Shares represented by the Restricted Stock Units to which this award relates (“DERs”). Dividend equivalents with respect to any such Share shall be paid on the same date that such Share is issued to the Grantee pursuant to Section I.E. hereof. The DERs shall be subject to the same terms and conditions applicable to the Restricted Stock Units, including, without limitation, the restrictions and non-transferability, vesting, forfeiture and distribution provisions contained in Sections I.B through I.E., inclusive, of this Agreement. In the event that the Restricted Stock Units are forfeited pursuant to Section I.D. hereof, the related DER shall also be forfeited.

B.    Restrictions and Non-Transferability. The Restricted Stock Units and DERs may not be sold, transferred, pledged, assigned or otherwise alienated or hypothecated. In addition, such Restricted Stock Units and DERs shall be subject to forfeiture in accordance with the provisions of Section I.D.

- 1 -

C.    Vesting of Restricted Stock Units. The Restricted Stock Units shall vest in three equal annual installments, with the first annual installment vesting on the first anniversary of the Date of Grant, and the next two annual installments vesting on each of the next two anniversaries of the Date of Grant (each such date, a “Vesting Date”); provided, however, that all of the unvested Restricted Stock Units and DERs will immediately vest on (i) the date of termination due to the death of the Grantee or (ii) the date of termination of the Grantee’s employment by the Company or its applicable affiliate for any reason other than Cause, or by the Grantee with Good Reason (as defined below), in each case within two (2) years following a Change in Control (a “Change in Control Termination”), if such termination of employment occurs prior to a Vesting Date. For the purposes of this Agreement, “Good Reason” means, (a) if the Grantee is a party to an employment or a severance agreement with the Company or one of its Subsidiaries in which “Good Reason” is defined, the occurrence of any circumstances defined as “Good Reason” in such employment or severance agreement, or (b) if the Grantee is not a party to an employment or severance agreement with the Company or one of the Subsidiaries in which “Good Reason” is defined, the relocation of the Grantee’s office at which the Grantee is to perform his or her duties to a location more than thirty (30) miles from the location at which the Grantee performed his or her duties prior to the Change in Control.

D.Forfeiture.    Upon the termination of Grantee's employment with the Company prior to the time the Restricted Stock Units have vested pursuant to Section I.C., other than a termination in the event of Grantee’s death, Disability or a Change in Control Termination, the Restricted Stock Units and DERs shall thereupon be forfeited immediately by Grantee. For the avoidance of doubt, no Restricted Stock Units or DERs shall be forfeited upon Grantee’s termination of employment due to Disability, with such Restricted Stock Units and DERs continuing to vest in accordance with the Vesting Dates provided in Section I.C.

E.Distributions. The Company shall issue to Grantee (or, if applicable, the Grantee’s estate or personal representative) Shares (or such other securities or other property into which the Shares have been converted, with any partial Shares or other securities to be settled in cash) with respect to the Grantee’s Restricted Stock Units and dividend equivalents accrued pursuant to the DERs with respect to such Restricted Stock Units, within 30 days of the date that the Restricted Stock Units vest in accordance with Section I.C hereof; provided, however, that, to the extent that the Restricted Stock Units are considered deferred compensation subject to Section 409A of the Code and the Restricted Stock Units vest in connection with the Grantee’s Change in Control Termination, then unless the Change in Control is a Section 409A Change in Control, the distribution of Shares (or such other securities or other property into which the Shares have been converted) shall not be accelerated to the vesting date but such distribution shall instead occur based on the Vesting Dates set forth in Section I.C. hereof. A “Section 409A Change in Control” shall mean a Change in Control that also constitutes a “change in ownership or effective control” of the Company or a “change in ownership of a substantial portion of the assets of” the Company, in each case within the meaning of Section 409A of the Code. Notwithstanding anything to the contrary contained herein, no Shares may be transferred to any person other than the

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Grantee unless such other person demonstrates to the reasonable satisfaction of the Company such person’s right to the transfer.

F.    Taxes. Federal, state and local income and employment taxes and other amounts as may be required by law to be collected by the Company (“Withholding Taxes”) in connection with the distribution of Shares, cash or other property or, to the extent applicable, vesting of the Restricted Stock Units or DERs hereunder, shall be paid by Grantee at such time. Notwithstanding the foregoing, the Company shall withhold delivery of a number of Shares with a Fair Market Value as of the distribution date equal to the Withholding Taxes required to be withheld in connection with such distribution.

II.    AGREEMENT NOT TO SOLICIT. Grantee acknowledges that Grantee’s continued employment with the Company and the grant of the Restricted Stock Units evidenced hereby is sufficient consideration for this Agreement, including, without limitation, the restrictions imposed by this Section II.

A.    Agreement Not To Solicit. Grantee hereby covenants and agrees that for a period commencing on the date hereof and ending twelve (12) months after the effective date of Grantee's termination of employment with the Company, Grantee, directly or indirectly, personally, or as an employee, officer, director, partner, member, owner, material shareholder, investor or principal of, or consultant or independent contractor with, another entity, shall not:

1.    Interfere with the relationship of the Company and/or any of its affiliates and any of its employees, agents, representatives, consultants or advisors.

2.    Divert, or attempt to cause the diversion from the Company and/or any of its affiliates, any Company Business, nor interfere with relationships of the Company and/or any of its affiliates with its policyholders, agents, brokers, dealers, distributors, marketers, sources of supply or customers.

3.    Solicit, recruit or otherwise induce or influence any employee of the Company and/or any of its affiliates to accept employment in any business which competes with the Company Business, in any of the geographic areas in which the Company and/or any of its affiliates is then currently doing Company Business.

B.Definitions.

For purposes of Section II.A, the following definitions apply.

1.    “Company Business” shall mean any business related to a service or product offered by the Company and/or any of its affiliates during the two-year period immediately preceding the Grantee’s termination date that Grantee engaged in or rendered any consultation or business advice or other services with respect to, during Grantee’s employment with the Company and/or any of its affiliates.

2    “Geographic area” shall mean any state, commonwealth or territory of the United States or any equivalent entity in any foreign country.

C.    Effect of Termination of Employment other than a Change in Control Termination on the Agreement Not to Solicit.

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1.    In the event Grantee voluntarily resigns or is discharged by Company with Cause at any time prior to the vesting of the Restricted Stock Unit, the prohibitions on Grantee set forth in Sections II.A shall remain in full force and effect.

2.    In the event Grantee is discharged by Company other than with Cause prior to vesting herein of the Restricted Stock Unit, the prohibitions set forth in Section II.A above shall remain in full force and effect.

3.    After the vesting of the Restricted Stock Unit, the prohibitions on Grantee set forth herein shall remain in full force and effect.

D.    Effect Of a Change In Control Termination on Agreement Not to Solicit. In the event of a Change in Control Termination, the prohibitions on Grantee set forth in Section II.A. shall remain in full force and effect.

F.    Governing Law. Notwithstanding any other provision herein to the contrary, the provisions of this Section II of the Agreement, shall be governed by, and construed in accordance with, the laws of the Commonwealth of Kentucky without regard to its conflicts or choice of laws rules or principles that might otherwise refer construction or interpretation of this Section II to the substantive law of another jurisdiction.

G.    Injunctive Relief; Invalidity of Any Provision. Grantee acknowledges that (1) his or her services to the Company are of a special, unique and extraordinary character, (2) his or her position with the Company will place him or her in a position of confidence and trust with respect to the operations of the Company, (3) he or she will benefit from continued employment with the Company, (4) the nature and periods of restrictions imposed by the covenants contained in this Section II hereof are fair, reasonable and necessary to protect the Company, (5) the Company would sustain immediate and irreparable loss and damage if Grantee were to breach any of such covenants, and (6) the Company’s remedy at law for such a breach will be inadequate. Accordingly, Grantee agrees and consents that the Company, in addition to the recovery of damages and all other remedies available to it, at law or in equity, shall be entitled to seek both preliminary and permanent injunctions to prevent and/or halt a breach or threatened breach by Grantee of any covenant contained in Section II hereof. If any provision of this Section II is determined by a court of competent jurisdiction to be invalid in whole or in part, it shall be deemed to have been amended, whether as to time, area covered or otherwise, as and to the extent required for its validity under applicable law, and as so amended, shall be enforceable. The parties further agree to execute all documents necessary to evidence such amendment.

III.    MISCELLANEOUS PROVISIONS

A.    Binding Effect & Adjustment.    This Agreement shall be binding and conclusive upon each successor and assign of the Company. Grantee’s obligations hereunder shall not be assignable to any other person or entity. It is the intent of the parties to this Agreement that the benefits of any appreciation of the underlying Common

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Stock during the term of the Award shall be preserved in any event, including but not limited to a recapitalization, merger, consolidation, reorganization, stock dividend, stock split, reverse stock split, spin-off or similar transaction, or other change in corporate structure affecting the Shares, as more fully described in Sections 4.6 and 11 of the Plan. All obligations imposed upon Grantee and all rights granted to Grantee and to the Company shall be binding upon Grantee's heirs and legal representatives.

B.    Amendment. This Agreement may only be amended by a writing executed by each of the parties hereto.

C.    Governing Law. Except as to matters of federal law and the provisions of Section II hereof, this Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware without regard to its conflict of laws rules. This Agreement shall also be governed by, and construed in accordance with, the terms of the Plan.

D.No Employment Agreement. Nothing herein confers on the Grantee any rights with respect to the continuance of employment or other service with the Company, nor will it interfere with any right the Company would otherwise have to terminate or modify the terms of Grantee's employment or other service at any time.

E.    Severability. If any provision of this Agreement is or becomes or is deemed invalid, illegal or unenforceable in any relevant jurisdiction, or would disqualify this Award under any law deemed applicable by the Committee, such provision shall be construed or deemed amended to conform to applicable laws or if it cannot be construed or deemed amended without, in the determination of the Committee, materially altering the intent of the Plan, it shall be stricken and the remainder of the Agreement shall remain in full force and effect.

F.    Defined Terms. Any term used herein and not otherwise defined herein shall have the same meaning as in the Plan. Any conflict between this Agreement and the Plan will be resolved in favor of the Plan.Any disputes or questions of right or obligation which shall result from or relate to any interpretation of this Agreement shall be determined by the Committee. Any such determination shall be binding and conclusive upon Grantee and any person or persons claiming through Grantee as to any rights hereunder.

G.    Execution. If Grantee shall fail to execute this Agreement, either manually with a paper document, or through the online grant agreement procedure with the Company’s designated broker–dealer, and, if manually executed, return the executed original to the Secretary of the Company, the Award shall be null and void. The choice of form will be at the Company’s discretion.

F.    Section 409A.  All Restricted Stock Units granted pursuant to this Agreement are intended either to be exempt from Section 409A of the Code, or, if subject to Section 409A of the Code, to be administered, operated and construed in compliance with Section 409A of the Code and any guidance issued thereunder. This Agreement and the Plan shall be administered in a manner consistent with this intent and any provision that would cause the Agreement or Plan to fail to satisfy the first sentence of this section shall have no force and effect. Notwithstanding anything

- 5 -

contained herein to the contrary, Restricted Stock Units (and related DERs) that (a) constitute “nonqualified deferred compensation” as defined under Section 409A of the Code and (b) vest as a consequence of the Grantee’s termination of employment, shall not be delivered until the date that the Grantee incurs a “separation from service” within the meaning of Section 409A of the Code (or, if the Grantee is a “specified employee” within the meaning of Section 409A of the Code and any guidance issued thereunder, the date that is six months and one day following the date of such “separation from service” (or on the date of the Grantee’s death, if earlier)). In addition, each amount to be paid or benefit to be provided to the Grantee pursuant to this Agreement that constitutes deferred compensation subject to Section 409A of the Code, shall be construed as a separate identified payment for purposes of Section 409A of the Code.

- 6 -

IN WITNESS WHEREOF, Company has caused this Agreement to be executed on its behalf by its duly authorized officer, and Grantee has executed this Agreement, each as of the day first above written.

		"Company"
ATTEST:		HUMANA INC.
BY:	/s/ JOAN O. LENAHAN	BY:	/s/ BRUCE D. BROUSSARD
	JOAN O. LENAHAN		BRUCE D. BROUSSARD
	Vice President and Corporate Secretary		President & Chief Executive Officer
		“Grantee”
		<first_name><middle_name><last_name>

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EX-12

Exhibit 12

Humana Inc.
Computation of Ratio of Earnings to Fixed Charges

	For the twelve months ended December 31,
	2015		2014		2013		2012		2011
	(Dollars in millions)
Income before income taxes	$	2,431	$	2,170	$	1,921	$	1,911	$	2,235
Fixed charges	253		267		216		178		178
Total earnings	$	2,684	$	2,437	$	2,137	$	2,089	$	2,413
Interest charged to expense	$	186	$	192	$	140	$	105	$	109
One-third of rent expense	67		75		76		73		69
Total fixed charges	$	253	$	267	$	216	$	178	$	178
Ratio of earnings to fixed charges (1)(2)	10.6x		9.1x		9.9x		11.7x		13.6x

Notes

(1) For the purposes of determining the ratio of earnings to fixed charges, earnings consist of income before income taxes and fixed charges. Fixed charges include gross interest expense, amortization of deferred financing expenses and an amount equivalent to interest included in rental charges. One-third of rental expense represents a reasonable approximation of the interest amount.

(2) There are no shares of preferred stock outstanding.

EX-21

EXHIBIT 21

HUMANA INC.

SUBSIDIARY LIST

ARIZONA

1. SeniorBridge Family Companies (AZ), Inc.

ARKANSAS

1.    Humana Regional Health Plan, Inc.

CALIFORNIA

1.    HRI Humana of California Inc.

2.    Humana Health Plan of California, Inc.

3.    SeniorBridge Family Companies (CA), Inc.

CONNECTICUT

1.    SeniorBridge Family Companies (CT), Inc.

DELAWARE

1.    American Tax Credit Corporate Georgia Fund III, L.L.C.

2.    Availity, L.L.C.

3.    B-Cycle, LLC

4.    CompBenefits Corporation

5.    CompBenefits Direct, Inc.

6.    DefenseWeb Technologies, Inc.

7.    Emphesys, Inc.

8.    Health Value Management, Inc.

9.    HUM INT, LLC

10.    Humana at Home, Inc.

11.    Humana Government Business, Inc.

12    Humana Inc.

13.    Humana Innovation Enterprises, Inc.

14.    Humana Pharmacy, Inc.

15.    Humana Veterans Healthcare Services, Inc.

16.    Humana WellWorks LLC

17.    HumanaDental, Inc.

18.    HumanaVitality, LLC

19.    Primary Care Holdings, Inc.

20.    Symphony Health Partners-Midwest, LLC

21.    Symphony Health Partners, Inc.

22.    Transcend Insights, Inc.

23.    Transcend Population Health Management, LLC

FLORIDA

1.    154th Street Medical Plaza, Inc.

2.    1st Choice Home Health Care, LLC

3.    54th Street Medical Plaza, Inc.

4.    American Eldercare of North Florida, LLC

5.    American Eldercare, Inc.

6.    CAC Medical Center Holdings, Inc.

7.    CAC-Florida Medical Centers, LLC

8.    Care Partners Home Care, LLC

9.    CarePlus Health Plans, Inc.

10.    CNU Blue 2, LLC

11.    CompBenefits Company

12.    Complex Clinical Management, Inc.

13.    Continucare Corporation

14.    Continucare Managed Care, Inc.

15.    Continucare MDHC, LLC

16.    Continucare Medical Management, Inc.

17.    Continucare MSO, Inc.

18.    DataLink Solutions, Inc.

19.    HUM-e-FL, Inc.

20.    Humana At Home 1, Inc.

21.    Humana Dental Company

22.    Humana Health Insurance Company of Florida, Inc.

23.    Humana Medical Plan, Inc.

24.    METCARE of Florida, Inc.

25.    Metropolitan Health Networks, Inc.

26.    Naples Health Care Specialists, LLC

27.    Nursing Solutions, LLC

28.    Partners in Integrated Care, Inc.

29.    SeniorBridge Family Companies (FL), Inc.

30.    SeniorBridge-Florida, LLC

31.    Seredor Corporation

GEORGIA

1.    Humana Employers Health Plan of Georgia, Inc.

ILLINOIS

1.    CompBenefits Dental, Inc.

2.    Comprehensive Health Insights, Inc.

3.    Dental Care Plus Management, Corp.

4.    Humana Benefit Plan of Illinois, Inc.

5.    Humana Dental Concern, Ltd.

6.    SeniorBridge Family Companies (IL), Inc.

INDIANA

1.    SeniorBridge Family Companies (IN), Inc.

KENTUCKY

1.    516-526 West Main Street Condominium Council of Co-Owners, Inc.

2.    CHA HMO, Inc.

3.    CHA Service Company

4.    HUM-Holdings International, Inc.

5.    Humana Active Outlook, Inc.

6.    Humana Health Plan, Inc.

7.    Humana Insurance Company of Kentucky

8.    Humana MarketPOINT, Inc.

9.    Humana Pharmacy Solutions, Inc.

10.    Humco, Inc.

11.    Preservation on Main, Inc.

12.    The Dental Concern, Inc.

LOUISIANA

1.    Humana Health Benefit Plan of Louisiana, Inc.

MARYLAND

1. SeniorBridge Family Companies (MD), Inc.

MASSACHUSETTS

1.    Humana at Home (MA), Inc.    

MICHIGAN

1.    Humana Medical Plan of Michigan, Inc.

MISSOURI

1.    SeniorBridge Family Companies (MO), Inc.

NEW JERSEY

1.    SeniorBridge Family Companies (NJ), Inc.

NEW YORK

1.    Harris, Rothenberg International Inc.

2.    Humana Health Company of New York, Inc.

3.    Humana Insurance Company of New York

4.    SeniorBridge Care Management, Inc.

5.    SeniorBridge Family Companies (NY), Inc.

NORTH CAROLINA

1.    Premier Sleep Services, LLC

2.    SeniorBridge (NC), Inc.

OHIO

1.    Humana Health Plan of Ohio, Inc.

2.    Hummingbird Coaching Systems LLC

3.    SeniorBridge Family Companies (OH), Inc.

PENNSYLVANIA

1.    Humana Medical Plan of Pennsylvania, Inc.

2.    SeniorBridge Family Companies (PA), Inc.

PUERTO RICO

1.    Humana Health Plans of Puerto Rico, Inc.

2.    Humana Insurance of Puerto Rico, Inc.

3.    Humana MarketPOINT of Puerto Rico, Inc.

SOUTH CAROLINA

1. Kanawha Insurance Company

TENNESSEE

1. Cariten Health Plan Inc.

2.    PHP Companies, Inc.

3.    Preferred Health Partnership, Inc.

TEXAS

1.    CompBenefits Insurance Company

2.    Corphealth Provider Link, Inc.

3.    DentiCare, Inc.

4.    Emphesys Insurance Company

5.    Humana At Home (Dallas), Inc.

6.    Humana At Home (Houston), Inc.

7.    Humana At Home (TLC), Inc.

8.    Humana Behavioral Health, Inc.

9.    Humana Health Plan of Texas, Inc.

10.    ROHC, L.L.C.

11.    SeniorBridge Family Companies (TX), Inc.

12.    Texas Dental Plans, Inc.

UTAH

1.    Humana Medical Plan of Utah, Inc.

VERMONT

1.    Managed Care Indemnity, Inc.

VIRGINIA

1.    KMG America Corporation

2.    SeniorBridge Family Companies (VA), Inc.

WASHINGTON

1.    Arcadian Health Plan, Inc.

WISCONSIN

1.    CareNetwork, Inc.

2.    Humana Insurance Company

3.    Humana Wisconsin Health Organization Insurance Corporation

4.    HumanaDental Insurance Company

5.    Independent Care Health Plan

EX-23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (No. 33-49305, No. 333-04435, No. 333-57095, No. 333-86801, No. 333-41408, No. 333-86280, No. 333-105622, No. 333-134887, No. 333-162747, No. 333-171616, and No. 333-175350) and Form S-3 (No. 333-180023) of Humana Inc. of our reportdated February 18, 2016 relating to the financial statements, financial statement schedules and the effectiveness of internal control over financial reporting, which appears in this Form 10‑K.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

Louisville, Kentucky

February 18, 2016

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO SECTION 302 OF SARBANES-OXLEY ACT OF 2002

I, Bruce D. Broussard, principal executive officer of Humana Inc., certify that:

1. I have reviewed this annual report on Form 10-K of Humana Inc.;

2. Based on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.     The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	February 18, 2016
Signature:	/s/ BRUCE D. BROUSSARD
	Bruce D. Broussard Principal Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO SECTION 302 OF SARBANES-OXLEY ACT OF 2002

I, Brian A. Kane, principal financial officer of Humana Inc., certify that:

1. I have reviewed this annual report on Form 10-K of Humana Inc.;

2. Based on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	February 18, 2016
Signature:	/s/ BRIAN A. KANE
	Brian A. Kane Principal Financial Officer

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Humana Inc. (the “Company”) on Form 10-K for the period ended December 31, 2015 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned hereby certifies, pursuant to 18 U.S.C. Sec. 1350, as adopted pursuant to Sec. 906 of the Sarbanes-Oxley Act of 2002, in his capacity as an officer of Humana Inc., that:

(1) The Report fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/ BRUCE D. BROUSSARD

Bruce D. Broussard

President and Chief Executive Officer,

Director (Principal Executive Officer)

February 18, 2016

/s/ BRIAN A. KANE

Brian A. Kane

Senior Vice President and Chief Financial Officer
(Principal Financial Officer)

February 18, 2016

A signed original of this written statement required by Section 906 has been provided to Humana Inc. and will be retained by Humana Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Jan. 31, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Entity Registrant Name	HUMANA INC
Trading Symbol	HUM
Entity Central Index Key	0000049071
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		148,303,389
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 28,626,230,036

XML

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 2,571	$ 1,935
Investment securities	7,267	7,598
Receivables, less allowance for doubtful accounts of $101 in 2015 and $98 in 2014	1,161	1,053
Other current assets	4,712	4,007
Assets held-for-sale	0	943
Total current assets	15,711	15,536
Property and equipment, net	1,384	1,228
Long-term investment securities	1,843	1,949
Goodwill	3,265	3,231
Other long-term assets	2,502	1,583
Total assets	24,705	23,527
Current liabilities:
Benefits payable	4,976	4,475
Trade accounts payable and accrued expenses	2,212	2,095
Book overdraft	301	334
Unearned revenues	364	361
Short-term borrowings	299	0
Liabilities held-for-sale	0	206
Total current liabilities	8,152	7,471
Long-term debt	3,821	3,825
Future policy benefits payable	2,151	2,349
Other long-term liabilities	235	236
Total liabilities	$ 14,359	$ 13,881
Commitments and contingencies (Note 16)
Stockholders’ equity:
Preferred stock, $1 par; 10,000,000 shares authorized; none issued	$ 0	$ 0
Common stock, $0.16 2/3 par; 300,000,000 shares authorized; 198,372,059 shares issued at December 31, 2015 and 197,951,551 shares issued at December 31, 2014	33	33
Capital in excess of par value	2,530	2,330
Retained earnings	11,017	9,916
Accumulated other comprehensive income	58	223
Treasury stock, at cost, 50,084,043 shares at December 31, 2015 and 48,347,541 shares at December 31, 2014	(3,292)	(2,856)
Total stockholders’ equity	10,346	9,646
Total liabilities and stockholders’ equity	$ 24,705	$ 23,527

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Receivables, allowance for doubtful accounts	$ 101	$ 98
Preferred stock, par	$ 1	$ 1
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, issued	0	0
Common stock, par	$ 0.1667	$ 0.1667
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	198,372,059	197,951,551
Treasury stock, shares	50,084,043	48,347,541

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Consolidated Statements Of Income - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Premiums									$ 52,409	$ 45,959	$ 38,829
Services									1,406	2,164	2,109
Investment income									474	377	375
Total revenues	$ 13,361	$ 13,363	$ 13,732	$ 13,833	$ 12,328	$ 12,238	$ 12,222	$ 11,712	54,289	48,500	41,313
Operating expenses:
Benefits									44,269	38,166	32,564
Operating costs									7,318	7,639	6,355
Depreciation and amortization									355	333	333
Total operating expenses									51,942	46,138	39,252
Income from operations									2,347	2,362	2,061
Gain on sale of business									270	0	0
Interest expense									186	192	140
Income before income taxes	246	648	793	744	287	551	646	686	2,431	2,170	1,921
Provision for income taxes									1,155	1,023	690
Net income	$ 101	$ 314	$ 431	$ 430	$ 145	$ 290	$ 344	$ 368	$ 1,276	$ 1,147	$ 1,231
Basic earnings per common share (in dollars per share)	$ 0.68	$ 2.11	$ 2.88	$ 2.86	$ 0.96	$ 1.87	$ 2.22	$ 2.37	$ 8.54	$ 7.44	$ 7.81
Diluted earnings per common share (in dollars per share)	$ 0.67	$ 2.09	$ 2.85	$ 2.82	$ 0.94	$ 1.85	$ 2.19	$ 2.35	8.44	7.36	7.73
Dividends declared per common share (in dollars per share)									$ 1.15	$ 1.11	$ 1.07

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Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 101	$ 314	$ 431	$ 430	$ 145	$ 290	$ 344	$ 368	$ 1,276	$ 1,147	$ 1,231
Other comprehensive (loss) income:
Change in gross unrealized investment gains/losses									(114)	122	(338)
Effect of income taxes									42	(44)	124
Total change in unrealized investment gains/losses, net of tax									(72)	78	(214)
Reclassification adjustment for net realized gains included in investment income									(146)	(20)	(22)
Effect of income taxes									53	7	8
Total reclassification adjustment, net of tax									(93)	(13)	(14)
Other comprehensive (loss) income, net of tax									(165)	65	(228)
Comprehensive income									$ 1,111	$ 1,212	$ 1,003

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Consolidated Statements Of Stockholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Capital In Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at Dec. 31, 2012	$ 8,847	$ 32	$ 2,101	$ 7,881	$ 386	$ (1,553)
Balances, issued shares at Dec. 31, 2012		194,471
Net income	1,231			1,231
Other comprehensive income	(228)				(228)
Common stock repurchases	(531)					(531)
Dividends and dividend equivalents	(170)		0	(170)
Stock-based compensation	92		92
Restricted stock grants and restricted stock unit vesting	0	$ 0
Restricted stock grants and restricted stock unit vesting, issued shares		563
Stock option exercises	67	$ 1	66
Stock option exercises, issued shares		1,242
Stock option and restricted stock tax benefit	8		8
Balance at Dec. 31, 2013	9,316	$ 33	2,267	8,942	158	(2,084)
Balances, issued shares at Dec. 31, 2013		196,276
Net income	1,147			1,147
Other comprehensive income	65				65
Common stock repurchases	(872)		(100)			(772)
Dividends and dividend equivalents	(173)		0	(173)
Stock-based compensation	98		98
Restricted stock grants and restricted stock unit vesting	0	$ 0
Restricted stock grants and restricted stock unit vesting, issued shares		966
Stock option exercises	52	$ 0	52
Stock option exercises, issued shares		710
Stock option and restricted stock tax benefit	13		13
Balance at Dec. 31, 2014	9,646	$ 33	2,330	9,916	223	(2,856)
Balances, issued shares at Dec. 31, 2014		197,952
Net income	1,276			1,276
Other comprehensive income	(165)				(165)
Common stock repurchases	(385)		100			(485)
Dividends and dividend equivalents	(175)		0	(175)
Stock-based compensation	109		109
Restricted stock grants and restricted stock unit vesting	0	$ 0	(49)			49
Restricted stock grants and restricted stock unit vesting, issued shares		159
Stock option exercises	$ 23	$ 0	23
Stock option exercises, issued shares	304	261
Stock option and restricted stock tax benefit	$ 17		17
Balance at Dec. 31, 2015	$ 10,346	$ 33	$ 2,530	$ 11,017	$ 58	$ (3,292)
Balances, issued shares at Dec. 31, 2015		198,372

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Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities
Net income	$ 1,276	$ 1,147	$ 1,231
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of business	(270)	0	0
Depreciation	354	328	309
Amortization	93	121	117
Stock-based compensation	109	98	92
Net realized capital gains	(146)	(20)	(22)
(Benefit) provision for deferred income taxes	(2)	(64)	42
Provision for doubtful accounts	61	32	37
Changes in operating assets and liabilities, net of effect of businesses acquired and dispositions:
Receivables	(180)	(264)	(251)
Other assets	(872)	(952)	(330)
Benefits payable	501	582	109
Other liabilities	(129)	413	313
Unearned revenues	3	155	(24)
Other	70	42	93
Net cash provided by operating activities	868	1,618	1,716
Cash flows from investing activities
Acquisitions, net of cash acquired	(38)	(18)	(187)
Proceeds from sale of business	1,061	72	34
Purchases of property and equipment	(523)	(528)	(441)
Proceeds from sales of property and equipment	1	0	4
Purchases of investment securities	(6,739)	(2,883)	(3,261)
Maturities of investment securities	1,065	885	1,077
Proceeds from sales of investment securities	5,493	2,409	1,592
Net cash provided by (used in) investing activities	320	(63)	(1,182)
Cash flows from financing activities
Receipts (withdrawals) from contract deposits, net	(296)	(919)	(150)
Proceeds from issuance of senior notes, net	0	1,733	0
Proceeds from issuance of commercial paper, net	298	0	0
Repayment of long-term debt	0	(500)	0
Common stock repurchases	(385)	(872)	(531)
Dividends paid	(172)	(172)	(168)
Excess tax benefit from stock-based compensation	15	12	8
Change in book overdraft	(33)	(69)	79
Proceeds from stock option exercises and other, net	21	29	60
Net cash used in financing activities	(552)	(758)	(702)
Increase (decrease) in cash and cash equivalents	636	797	(168)
Cash and cash equivalents at beginning of year	1,935	1,138	1,306
Cash and cash equivalents at end of year	2,571	1,935	1,138
Supplemental cash flow disclosures:
Interest payments	187	143	146
Income tax payments, net	1,179	1,030	734
Details of businesses acquired in purchase transactions:
Fair value of assets acquired, net of cash acquired	38	18	196
Less: Fair value of liabilities assumed	0	0	(9)
Cash paid for acquired businesses, net of cash acquired	$ 38	$ 18	$ 187

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REPORTING ENTITY

12 Months Ended

Dec. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

REPORTING ENTITY

REPORTING ENTITY

Nature of Operations

Humana Inc., headquartered in Louisville, Kentucky, is a leading health and well-being company focused on making it easy for people to achieve their best health with clinical excellence through coordinated care. Our strategy integrates care delivery, the member experience, and clinical and consumer insights to encourage engagement, behavior change, proactive clinical outreach and wellness for the millions of people we serve across the country. References throughout these notes to consolidated financial statements to “we,” “us,” “our,” “Company,” and “Humana,” mean Humana Inc. and its subsidiaries. We derived approximately 73% of our total premiums and services revenue from contracts with the federal government in 2015, including 14% related to our federal government contracts with the Centers for Medicare and Medicaid Services, or CMS, to provide health insurance coverage for individual Medicare Advantage members in Florida. CMS is the federal government’s agency responsible for administering the Medicare program.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

Our financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of America. Our consolidated financial statements include the accounts of Humana Inc. and subsidiaries that the Company controls, including variable interest entities associated with medical practices for which we are the primary beneficiary. We do not own many of our medical practices but instead enter into exclusive management agreements with the affiliated Professional Associations, or P.A.s, that operate these medical practices. Based upon the provisions of these agreements, these affiliated P.A.s are variable interest entities and we are the primary beneficiary, and accordingly we consolidated the affiliated P.A.s. All significant intercompany balances and transactions have been eliminated.

The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America requires us to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. The areas involving the most significant use of estimates are the estimation of benefits payable, future policy benefits payable, the impact of risk adjustment provisions related to our Medicare contracts, the valuation and related impairment recognition of investmentsecurities, and the valuation and related impairment recognition of long-lived assets, including goodwill. These estimates are based on knowledge of current events and anticipated future events, and accordingly, actual results may ultimately differ materially from those estimates.

Certain amounts have been reclassified to conform to the current year presentation, including business segment reclassifications discussed below and the reclassification of Concentra Inc. assets and liabilities as held-for-sale in our December 31, 2014 balance sheet for comparative purposes. Refer to Note 3 for a discussion of the sale of Concentra in June 2015.

Aetna Merger

On July 2, 2015, we entered into an Agreement and Plan of Merger, which we refer to in this report as the Merger Agreement, with Aetna Inc. and certain wholly owned subsidiaries of Aetna Inc., which we refer to collectively as Aetna, which sets forth the terms and conditions under which we will merge with, and become a wholly owned subsidiary of Aetna, a transaction we refer to in this report as the Merger. Under the terms of the Merger Agreement, at the closing of the Merger, each outstanding share of our common stock will be converted into the right to receive (i) 0.8375 of a share of Aetna common stock and (ii) $125 in cash. The total transaction was estimated at approximately $37 billion including the assumption of Humana debt, based on the closing price of Aetna common shares on July 2, 2015. The Merger Agreement includes customary restrictions on the conduct of our business prior to the completion of the Merger, generally requiring us to conduct our business in the ordinary course and subjecting us to a variety of customary specified limitations absent Aetna’s prior written consent, including, for example, limitations on dividends (we agreed that our quarterly dividend will not exceed $0.29 per share) and repurchases of our securities (we agreed to suspend our share repurchase program), restrictions on our ability to enter into material contracts, and negotiated thresholds for capital expenditures, capital contributions, acquisitions and divestitures of businesses.

On October 19, 2015, our stockholders approved the adoption of the Merger Agreement at a special stockholder meeting.Also on October 19, 2015, the holders of Aetna outstanding shares approved the issuance of Aetna common stock in the Merger at a special meeting of Aetna shareholders.

The Merger is subject to customary closing conditions, including, among other things, (i) the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the receipt of necessary approvals under state insurance and healthcare laws and regulations and pursuant to certain licenses of certain of Humana’s subsidiaries, (ii) the absence of legal restraints and prohibitions on the consummation of the Merger, (iii) listing of the Aetna common stock to be issued in the Merger on the New York Stock Exchange, (iv) subject to the relevant standards set forth in the Merger Agreement, the accuracy of the representations and warranties made by each party, (v) material compliance by each party with its covenants in the Merger Agreement, and (vi) no “Company Material Adverse Effect” with respect to us and no “Parent Material Adverse Effect” with respect to Aetna, in each case since the execution of and as defined in the Merger Agreement. In addition, Aetna’s obligation to consummate the Merger is subject to (a) the condition that the required regulatory approvals do not impose any condition that, individually or in the aggregate, would reasonably be expected to have a “Regulatory Material Adverse Effect” (as such term is defined in the Merger Agreement), and (b) CMS has not imposed any sanctions with respect to our Medicare Advantage, or MA, business that, individually or in the aggregate, is or would reasonably be expected to be material and adverse to us and our subsidiaries, taken as a whole. The Merger is currently expected to close in the second half of 2016.

Business Segment Reclassifications

On January 1, 2015, we realigned certain of our businesses among our reportable segments to correspond with internal management reporting changes and renamed our Employer Group segment to the Group segment. Our three reportable segments remain Retail, Group, and Healthcare Services. The more significant realignments included reclassifying Medicare benefits offered to groups to the Retail segment from the Group segment, bringing all of our Medicare offerings, which are now managed collectively, together in one segment, recognizing that in some instances we market directly to individuals that are part of a group Medicare account. In addition, we realigned our military services business, primarily consisting of our TRICARE South Region contract previously included in the Other Businesses category, to our Group segment as we consider this contract with the government to be a group account. Prior period segment financial information has been recast to conform to the 2015 presentation. See Note 17 for segment financial information and Note 9 for goodwill information by segment.

Health Care Reform

The Patient Protection and Affordable Care Act and The Health Care and Education Reconciliation Act of 2010 (which we collectively refer to as the Health Care Reform Law) enacted significant reforms to various aspects of the U.S. health insurance industry. Certain of these reforms became effective January 1, 2014, including an annual insurance industry premium-based fee and the establishment of federally-facilitated or state-based exchanges coupled with three premium stabilization programs, as described more fully below.

The Health Care Reform Law imposes an annual premium-based fee on health insurers for each calendar year beginning on or after January 1, 2014 which is not deductible for tax purposes. We are required to estimate a liability for the health insurer fee and record it in full once qualifying insurance coverage is provided in the applicable calendar year in which the fee is payable with a corresponding deferred cost that is amortized ratably to expense over the same calendar year. We record the liability for the health insurer fee in trade accounts payable and accrued expenses and record the deferred cost in other current assets in our consolidated financial statements. We pay the health insurer fee in September of each year. The Consolidated Appropriations Act, 2016, enacted on December 18, 2015, included a one-time one year suspension in 2017 of the health insurer fee. See Note 7 for detail regarding amounts paid for the annual health insurer fee.

The Health Care Reform Law also establishes risk spreading premium stabilization programs effective January 1, 2014. The risk spreading programs are applicable to certain of our commercial medical insurance products. In the aggregate, our commercial medical insurance products represented approximately 18% of our total premiums and services revenue for the year ended December 31, 2015, a subset of which is subject to these programs. These programs, commonly referred to as the 3Rs, include a permanent risk adjustment program, a transitional reinsurance program, and a temporary risk corridors program designed to more evenly spread the financial risk borne by issuers and to mitigate the risk that issuers would have mispriced products. The transitional reinsurance and temporary risk corridors programs are for years 2014 through 2016, with potential for additional reinsurance recoveries through 2018 to the extent funds are available. Policies issued prior to March 23, 2010 are considered grandfathered policies and are exempt from the 3Rs. Certain states have allowed non-grandfathered policies issued prior to January 1, 2014 to extend the date of required transition to policies compliant with the Health Care Reform Law to as late as 2017. Accordingly, such policies are exempt from the 3Rs until they transition to policies compliant with the Health Care Reform Law.

The permanent risk adjustment program adjusts the premiums that commercial individual and small group health insurance issuers receive based on the demographic factors and health status of each member as derived from current year medical diagnosis as reported throughout the year. This program transfers funds from lower risk plans to higher risk plans within similar plans in the same state. The risk adjustment program is applicable to commercial individual and small group health plans (except certain exempt and grandfathered plans as discussed above) operating both inside and outside of the health insurance exchanges established under the Health Care Reform Law. Under the risk adjustment program, a risk score is assigned to each covered member to determine an average risk score at the individual and small group level by legal entity in a particular market in a state. Additionally, an average risk score is determined for the entire subject population for each market in each state. Settlements are determined on a net basis by legal entity and state. Each health insurance issuer’s average risk score is compared to the state’s average risk score. Plans with an average risk score below the state average will pay into a pool and health insurance issuers with an average risk score that is greater than the state average risk score will receive money from that pool. We generally rely on providers, including certain network providers who are our employees, to appropriately document all medical data, including the diagnosis codes submitted with claims, as the basis for our risk scores under the program. Our estimate of amounts receivable and/or payable under the risk adjustment program is based on our estimate of both our own and the state average risk scores. Assumptions used in these estimates include but are not limited to published third party studies and other publicly available data including regulatory plan filings, geographic considerations including our historical experience in markets we have participated in over a long period of time, member demographics (including age and gender for our members and other health insurance issuers), our pricing model, sales data for each metal tier (different metal tiers yield different risk scores), and the mix of previously underwritten membership as compared to new members in plans compliant with the Health Care Reform Law. We refine our estimates as new information becomes available, including additional data released by the Department of Health and Human Services, or HHS, regarding estimates of state average risk scores. Risk adjustment is subject to audit by HHS beginning with the 2015 coverage year, however, there will be no payments associated with these audits for 2015, the pilot year for the audits.

The temporary risk corridor program applies to individual and small group Qualified Health Plans (or substantially equivalent plans), or QHPs, as defined by HHS, operating both inside and outside of the exchanges. Accordingly, plans subject to risk adjustment that are not QHPs, including our small group health plans, were not subject to the risk corridor program in 2014 or 2015. The risk corridor provisions limit issuer gains and losses by comparing allowable medical costs to a target amount, each defined/prescribed by HHS, and sharing the risk for allowable costs with the federal government. Allowable medical costs are adjusted for risk adjustment settlements, transitional reinsurance recoveries, and cost sharing reductions received from HHS. Variances from the target exceeding certain thresholds may result in HHS making additional payments to us or require us to refund HHS a portion of the premiums we received.

We estimate and recognize adjustments to premiums revenue for the risk adjustment and risk corridor provisions by projecting our ultimate premium for the calendar year separately for individual and group plans by state and legal entity. Estimated calendar year settlement amounts are recognized ratably during the year and are revised each period to reflect current experience, including changes in risk scores derived from medical diagnoses submitted by providers. We record receivables or payables at the individual or group level within each state and legal entity and classify the amounts as current or long-term in our consolidated balance sheets based on the timing of expected settlement.

The transitional reinsurance program requires us to make reinsurance contributions for calendar years 2014 through 2016 to a state or HHS established reinsurance entity based on a national contribution rate per covered member as determined by HHS. While all commercial medical plans, including self-funded plans, are required to fund the reinsurance entity, only fully-insured non-grandfathered plans compliant with the Health Care Reform Law in the individual commercial market will be eligible for recoveries if individual claims exceed a specified threshold. Accordingly, we account for transitional reinsurance contributions associated with all commercial medical health plans other than these non-grandfathered individual plans as an assessment in operating costs in our consolidated statements of income. We account for contributions made by individual commercial plans compliant with the Health Care Reform Law, which are subject to recoveries, as ceded premiums (a reduction of premiums) and similarly we account for any recoveries as ceded benefits (a reduction of benefits expense) in our consolidated statements of income.

We are required to remit payment for our per member reinsurance contribution, exclusive of the portion payable to the U.S. Treasury, by January 15 of the year following the coverage year, or January 15, 2016 for the 2015 coverage year. The portion of the reinsurance contribution due to the U.S. Treasury must be paid by November 15 of the year following the coverage year, or November 15, 2016 for the 2015 coverage year. Risk adjustment calculations will be completed and HHS will notify us of recoveries due or payments owed to/from us under the risk adjustment and reinsurance programs by June 30 of the year following the coverage year. Following this notification, risk corridor calculations are then due by July 31 of the year following the coverage year. Payments due to HHS under the risk adjustment and risk corridor programs must be remitted within 30 days of notification for each program and will be collected prior to the distribution of recoveries by HHS under each program. Payment and recovery amounts associated with reinsurance and risk adjustment will generally be settled with HHS annually in the year following the coverage year. Accordingly, for the 2015 coverage year, we expect to receive recoveries and/or pay amounts due under these programs in 2016. The risk corridor program is a three year program. We are required to pay gross risk corridor payables in the second half of the year following the coverage year. Interim settlements of risk corridor receivables in the year following the coverage year are limited to risk corridor amounts collected by HHS and available for distribution in the year following the coverage year. HHS guidance provides that risk corridor collections over the life of the three year program will first be applied to any shortfalls from previous coverage years before application to current year obligations.Risk corridor payables to issuers are obligations of the United States Government under the Health Care Reform law which requires the Secretary of HHS to make full payments to issuers. In the event of a shortfall at the end of the three year program, HHS has asserted it will explore other sources of funding for risk corridor payments, subject to the availability of appropriations.

See Note 7 for detail regarding amounts recorded to the consolidated balance sheets related to the 3Rs.

In addition to the provisions discussed above, beginning in 2014, HHS pays us a portion of the health care costs for low-income individual members for which we assume no risk in accordance with the Health Care Reform Law. We account for these subsidies as a deposit in our consolidated balance sheets and as a financing activity in our consolidated statements of cash flows. We do not recognize premiums revenue or benefits expense for these subsidies. Receipt and payment activity is accumulated at the state and legal entity level and recorded in our consolidated balance sheet in other current assets or trade accounts payable and accrued expenses depending on the state and legal entity balance at the end of the reporting period. We will be notified of final settlement amounts by June 30 of the year following the coverage year. Receipts from HHS associated with cost sharing subsidies for which we do not assume risk were approximately $478 million, exceeding payments of $409 million by $69 million for the year ended December 31, 2015. For the year ended December 31, 2014, receipts from HHS associated with cost sharing subsidies for which we do not assume risk were approximately $281 million, exceeding payments of $255 million by $26 million. The program began in 2014, and as such, there were no receipts or payments from HHS for cost sharing subsidies in 2013.

Cash and Cash Equivalents

Cash and cash equivalents include cash, time deposits, money market funds, commercial paper, other money market instruments, and certain U.S. Government securities with an original maturity of three months or less. Carrying value approximates fair value due to the short-term maturity of the investments.

Investment Securities

Investment securities, which consist entirely of debt securities, have been categorized as available for sale and, as a result, are stated at fair value. Investment securities available for current operations are classified as current assets. Investment securities available for our long-term insurance products and professional liability funding requirements, as well as restricted statutory deposits, are classified as long-term assets. For the purpose of determining gross realized gains and losses, which are included as a component of investment income in the consolidated statements of income, the cost of investment securities sold is based upon specific identification. Unrealized holding gains and losses, net of applicable deferred taxes, are included as a component of stockholders’ equity and comprehensive income until realized from a sale or other-than-temporary impairment.

Under the other-than-temporary impairment model for debt securities held, we recognize an impairment loss in income in an amount equal to the full difference between the amortized cost basis and the fair value when we have the intent to sell the debt security or it is more likely than not we will be required to sell the debt security before recovery of our amortized cost basis. However, if we do not intend to sell the debt security, we evaluate the expected cash flows to be received as compared to amortized cost and determine if a credit loss has occurred. In the event of a credit loss, only the amount of the impairment associated with the credit loss is recognized currently in income with the remainder of the loss recognized in other comprehensive income.

When we do not intend to sell a security in an unrealized loss position, potential other-than-temporary impairment is considered using a variety of factors, including the length of time and extent to which the fair value has been less than cost; adverse conditions specifically related to the industry, geographic area or financial condition of the issuer or underlying collateral of a security; payment structure of the security; changes in credit rating of the security by the rating agencies; the volatility of the fair value changes; and changes in fair value of the security after the balance sheet date. For debt securities, we take into account expectations of relevant market and economic data. For example, with respect to mortgage and asset-backed securities, such data includes underlying loan level data and structural features such as seniority and other forms of credit enhancements. A decline in fair value is considered other-than-temporary when we do not expect to recover the entire amortized cost basis of the security. We estimate the amount of the credit loss component of a debt security as the difference between the amortized cost and the present value of the expected cash flows of the security. The present value is determined using the best estimate of future cash flows discounted at the implicit interest rate at the date of purchase.

Receivables and Revenue Recognition

We generally establish one-year commercial membership contracts with employer groups, subject to cancellation by the employer group on 30-day written notice. Our Medicare contracts with CMS renew annually. Our military services contracts with the federal government and our contracts with various state Medicaid programs generally are multi-year contracts subject to annual renewal provisions. Individual polices are subject to the requirements of the Health Care Reform Law as discussed previously.

Premiums Revenue

We bill and collect premium from employer groups and members in our Medicare and other individual products monthly. We receive monthly premiums from the federal government and various states according to government specified payment rates and various contractual terms. Changes in revenues for our Medicare and individual commercial medical products resulting from the periodic changes in risk-adjustment scores derived from medical diagnoses for our membership and changes in risk corridor estimates are recognized when the amounts become determinable and the collectibility is reasonably assured.

Premiums revenue is estimated by multiplying the membership covered under the various contracts by the contractual rates. Premiums revenue is recognized as income in the period members are entitled to receive services, and is net of estimated uncollectible amounts, retroactive membership adjustments, and adjustments to recognize rebates under the minimum benefit ratios required under the Health Care Reform Law. We estimate policyholder rebates by projecting calendar year minimum benefit ratios for the individual, small group, and large group markets, as defined by the Health Care Reform Law using a methodology prescribed by HHS, separately by state and legal entity. Beginning in 2014, Medicare Advantage products were also subject to minimum benefit ratio requirements under the Health Care Reform Law. Estimated calendar year rebates recognized ratably during the year are revised each period to reflect current experience. Retroactive membership adjustments result from enrollment changes not yet processed, or not yet reported by an employer group or the government. We routinely monitor the collectibility of specific accounts, the aging of receivables, historical retroactivity trends, estimated rebates, as well as prevailing and anticipated economic conditions, and reflect any required adjustments in current operations. Premiums received prior to the service period are recorded as unearned revenues.

Medicare Part D

We cover prescription drug benefits in accordance with Medicare Part D under multiple contracts with CMS. The payments we receive monthly from CMS and members, which are determined from our annual bid, represent amounts for providing prescription drug insurance coverage. We recognize premiums revenue for providing this insurance coverage ratably over the term of our annual contract. Our CMS payment is subject to risk sharing through the Medicare Part D risk corridor provisions. In addition, receipts for reinsurance and low-income cost subsidies as well as receipts for certain discounts on brand name prescription drugs in the coverage gap represent payments for prescription drug costs for which we are not at risk.

The risk corridor provisions compare costs targeted in our bids to actual prescription drug costs, limited to actual costs that would have been incurred under the standard coverage as defined by CMS. Variances exceeding certain thresholds may result in CMS making additional payments to us or require us to refund to CMS a portion of the premiums we received. As risk corridor provisions are considered in our overall annual bid process, we estimate and recognize an adjustment to premiums revenue related to these provisions based upon pharmacy claims experience. We record a receivable or payable at the contract level and classify the amount as current or long-term in our consolidated balance sheets based on the timing of expected settlement.

Reinsurance and low-income cost subsidies represent funding from CMS in connection with the Medicare Part D program for which we assume no risk. Reinsurance subsidies represent funding from CMS for its portion of prescription drug costs which exceed the member’s out-of-pocket threshold, or the catastrophic coverage level. Low-income cost subsidies represent funding from CMS for all or a portion of the deductible, the coinsurance and co-payment amounts above the out-of-pocket threshold for low-income beneficiaries. Monthly prospective payments from CMS for reinsurance and low-income cost subsidies are based on assumptions submitted with our annual bid. A reconciliation and related settlement of CMS’s prospective subsidies against actual prescription drug costs we paid is made after the end of the year. The Health Care Reform Law mandates consumer discounts of 50% on brand name prescription drugs for Part D plan participants in the coverage gap. These discounts are funded by CMS and pharmaceutical manufacturers while we administer the application of these funds. We account for these subsidies and discounts as a deposit in our consolidated balance sheets and as a financing activity under receipts (withdrawals) from contract deposits in our consolidated statements of cash flows. For 2015, subsidy and discount payments of $8.9 billion exceeded reimbursements of $8.6 billion by $361 million. For 2014, subsidy and discount payments of $6.7 billion exceeded reimbursements of $5.8 billion by $945 million. For 2013, subsidy and discount payments of $4.8 billion exceeded reimbursements of $4.6 billion by $154 million. We do not recognize premiums revenue or benefit expenses for these subsidies or discounts. Receipt and payment activity is accumulated at the contract level and recorded in our consolidated balance sheets in other current assets or trade accounts payable and accrued expenses depending on the contract balance at the end of the reporting period.

Settlement of the reinsurance and low-income cost subsidies as well as the risk corridor payment is based on a reconciliation made approximately 9 months after the close of each calendar year. Settlement with CMS for brand name prescription drug discounts is based on a reconciliation made approximately 14 to 18 months after the close of each calendar year. We continue to revise our estimates with respect to the risk corridor provisions based on subsequent period pharmacy claims data. See Note 6 for detail regarding amounts recorded to our consolidated balance sheets related to the risk corridor settlement and subsidies from CMS.

Services Revenue

Patient services revenue

Patient services include injury and illness care and related services as well as other healthcare services related to employer needs or as required by law. Patient services revenues are recognized in the period services are provided to the customer when the sales price is fixed or determinable, and are net of contractual allowances.

Administrative services fees

Administrative services fees cover the processing of claims, offering access to our provider networks and clinical programs, and responding to customer service inquiries from members of self-funded groups. Revenues from providing administration services, also known as administrative services only, or ASO, are recognized in the period services are performed and are net of estimated uncollectible amounts. ASO fees are estimated by multiplying the membership covered under the various contracts by the contractual rates. Under ASO contracts, self-funded employers retain the risk of financing substantially all of the cost of health benefits. However, many ASO customers purchase stop loss insurance coverage from us to cover catastrophic claims or to limit aggregate annual costs. Accordingly, we have recorded premiums revenue and benefits expense related to these stop loss insurance contracts. We routinely monitor the collectibility of specific accounts, the aging of receivables, as well as prevailing and anticipated economic conditions, and reflect any required adjustments in current operations. ASO fees received prior to the service period are recorded as unearned revenues.

Under our current TRICARE South Region contract with the Department of Defense, we provide administrative services, including offering access to our provider networks and clinical programs, claim processing, customer service, enrollment, and other services, while the federal government retains all of the risk of the cost of health benefits. We account for revenues under the current contract net of estimated health care costs similar to an administrative services fee only agreement. The current contract includes fixed administrative services fees and incentive fees and penalties. Administrative services fees are recognized as services are performed.

Our TRICARE members are served by both in-network and out-of-network providers in accordance with the current contract. We pay health care costs related to these services to the providers and are subsequently reimbursed by the DoD for such payments. We account for the payments of the federal government’s claims and the related reimbursements under deposit accounting in our consolidated balance sheets and as a financing activity under receipts (withdrawals) from contract deposits in our consolidated statements of cash flows. For 2015, health care cost reimbursements and payments were each approximately $3.3 billion, with payments exceeding reimbursements by $4 million for the year. For 2014, health care cost reimbursements and payments were each $3.2 billion. For 2013, health care cost reimbursements and payments were each approximately $3.2 billion, with reimbursements exceeding payments by $5 million for the year.

Receivables

Receivables, including premium receivables, patient services revenue receivables, and ASO fee receivables, are shown net of allowances for estimated uncollectible accounts, retroactive membership adjustments, and contractual allowances.

Policy Acquisition Costs

Policy acquisition costs are those costs that relate directly to the successful acquisition of new and renewal insurance policies. Such costs include commissions, costs of policy issuance and underwriting, and other costs we incur to acquire new business or renew existing business. We expense policy acquisition costs related to our employer-group prepaid health services policies as incurred. These short-duration employer-group prepaid health services policies typically have a 1-year term and may be cancelled upon 30 days notice by the employer group.

Life insurance, annuities, and certain health and other supplemental policies sold to individuals are accounted for as long-duration insurance products because they are expected to remain in force for an extended period beyond one year and premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. As a result, we defer policy acquisition costs, primarily consisting of commissions, and amortize them over the estimated life of the policies in proportion to premiums earned. Deferred acquisition costs are reviewed to determine if they are recoverable from future income. See Note 18.

Beginning in 2014, health policies sold to individuals that conform to the Health Care Reform Law are accounted for under a short-duration model and accordingly policy acquisition costs are expensed as incurred because premiums received in the current year are intended to pay anticipated benefits in that year. In addition, as previously underwritten members transition to plans compliant with the Health Care Reform Law, it results in policy lapses and the recognition of previously deferred acquisition costs.

Long-Lived Assets

Property and equipment is recorded at cost. Gains and losses on sales or disposals of property and equipment are included in operating costs. Certain costs related to the development or purchase of internal-use software are capitalized. Depreciation is computed using the straight-line method over estimated useful lives ranging from 3 to 10 years for equipment, 3 to 7 years for computer software, and 20 to 40 years for buildings. Improvements to leased facilities are depreciated over the shorter of the remaining lease term or the anticipated life of the improvement.

We periodically review long-lived assets, including property and equipment and other intangible assets, for impairment whenever adverse events or changes in circumstances indicate the carrying value of the asset may not be recoverable. Losses are recognized for a long-lived asset to be held and used in our operations when the undiscounted future cash flows expected to result from the use of the asset are less than its carrying value. We recognize an impairment loss based on the excess of the carrying value over the fair value of the asset. A long-lived asset held for sale is reported at the lower of the carrying amount or fair value less costs to sell. Depreciation expense is not recognized on assets held for sale. Losses are recognized for a long-lived asset to be abandoned when the asset ceases to be used. In addition, we periodically review the estimated lives of all long-lived assets for reasonableness.

Goodwill and Other Intangible Assets

Goodwill represents the unamortized excess of cost over the fair value of the net tangible and other intangible assets acquired. We are required to test at least annually for impairment at a level of reporting referred to as the reporting unit, and more frequently if adverse events or changes in circumstances indicate that the asset may be impaired. A reporting unit either is our operating segments or one level below the operating segments, referred to as a component, which comprise our reportable segments. A component is considered a reporting unit if the component constitutes a business for which discrete financial information is available that is regularly reviewed by management. We aggregate the components of an operating segment into one reporting unit if they have similar economic characteristics. Goodwill is assigned to the reporting unit that is expected to benefit from a specific acquisition.

We use a two-step process to review goodwill for impairment. The first step is a screen for potential impairment, and the second step measures the amount of impairment, if any. Impairment tests are performed, at a minimum, in the fourth quarter of each year supported by our long-range business plan and annual planning process. We rely on an evaluation of future discounted cash flows to determine fair value of our reporting units. Impairment tests completed for 2015, 2014, and 2013 did not result in an impairment loss.

Other intangible assets primarily relate to acquired customer contracts/relationships and are included with other long-term assets in the consolidated balance sheets. Other intangible assets are amortized over the useful life, based upon the pattern of future cash flows attributable to the asset. This sometimes results in an accelerated method of amortization for customer contracts because the asset tends to dissipate at a more rapid rate in earlier periods. Other than customer contracts, other intangible assets generally are amortized using the straight-line method. We review other finite-lived intangible assets for impairment under our long-lived asset policy.

Benefits Payable and Benefits Expense Recognition

Benefits expense includes claim payments, capitation payments, pharmacy costs net of rebates, allocations of certain centralized expenses and various other costs incurred to provide health insurance coverage to members, as well as estimates of future payments to hospitals and others for medical care and other supplemental benefits provided on or prior to the balance sheet date. Capitation payments represent monthly contractual fees disbursed to primary care and other providers who are responsible for providing medical care to members. Pharmacy costs represent payments for members’ prescription drug benefits, net of rebates from drug manufacturers. Receivables for such pharmacy rebates are included in other current assets in our consolidated balance sheets. Other supplemental benefits include dental, vision, and other supplemental health and financial protection products.

We estimate the costs of our benefits expense payments using actuarial methods and assumptions based upon claim payment patterns, medical cost inflation, historical developments such as claim inventory levels and claim receipt patterns, and other relevant factors, and record benefit reserves for future payments. We continually review estimates of future payments relating to claims costs for services incurred in the current and prior periods and make necessary adjustments to our reserves.

We reassess the profitability of our contracts for providing insurance coverage to our members when current operating results or forecasts indicate probable future losses. We establish a premium deficiency reserve in current operations to the extent that the sum of expected future costs, claim adjustment expenses, and maintenance costs exceeds related future premiums under contracts without consideration of investment income. For purposes of determining premium deficiencies, contracts are grouped in a manner consistent with our method of acquiring, servicing, and measuring the profitability of such contracts. Losses recognized as a premium deficiency result in a beneficial effect in subsequent periods as operating losses under these contracts are charged to the liability previously established. Because the majority of our member contracts renew annually, we would not record a material premium deficiency reserve, except when unanticipated adverse events or changes in circumstances indicate otherwise. In the fourth quarter of 2015, we recognized a premium deficiency reserve for our individual commercial medical business compliant with the Health Care Reform Law associated with the 2016 coverage year as discussed in more detail in Note 7.

We believe our benefits payable are adequate to cover future claims payments required. However, such estimates are based on knowledge of current events and anticipated future events. Therefore, the actual liability could differ materially from the amounts provided.

Future policy benefits payable

Future policy benefits payable include liabilities for long-duration insurance policies including long-term care, life insurance, annuities, and certain health and other supplemental policies sold to individuals for which some of the premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. At policy issuance, these reserves are recognized on a net level premium method based on interest rates, mortality, morbidity, and maintenance expense assumptions. Interest rates are based on our expected net investment returns on the investment portfolio supporting the reserves for these blocks of business. Mortality, a measure of expected death, and morbidity, a measure of health status, assumptions are based on published actuarial tables, modified based upon actual experience. Changes in estimates of these reserves are recognized as an adjustment to benefits expense in the period the changes occur. We perform loss recognition tests at least annually in the fourth quarter, and more frequently if adverse events or changes in circumstances indicate that the level of the liability, together with the present value of future gross premiums, may not be adequate to provide for future expected policy benefits and maintenance costs. We adjust future policy benefits payable for the additional liability that would have been recorded if investment securities backing the liability had been sold at their stated aggregate fair value and the proceeds reinvested at current yields. We include the impact of this adjustment, if any, net of applicable deferred taxes, with the change in unrealized investment gain (loss) in accumulated other comprehensive income in stockholders’ equity. As discussed previously, beginning in 2014, health policies sold to individuals that conform to the Health Care Reform Law are accounted for under a short-duration model under which policy reserves are not established because premiums received in the current year are intended to pay anticipated benefits in that year. In addition, as previously underwritten members transition to plans compliant with the Health Care Reform Law, it results in policy lapses and the release of reserves for future policy benefits.

Book Overdraft

Under our cash management system, checks issued but not yet presented to banks that would result in negative bank balances when presented are classified as a current liability in the consolidated balance sheets. Changes in book overdrafts from period to period are reported in the consolidated statement of cash flows as a financing activity.

Income Taxes

We recognize an asset or liability for the deferred tax consequences of temporary differences between the tax bases of assets or liabilities and their reported amounts in the consolidated financial statements. These temporary differences will result in taxable or deductible amounts in future years when the reported amounts of the assets or liabilities are recovered or settled. We also recognize the future tax benefits such as net operating and capital loss carryforwards as deferred tax assets. A valuation allowance is provided against these deferred tax assets if it is more likely than not that some portion or all of the deferred tax assets will not be realized. Future years’ tax expense may be increased or decreased by adjustments to the valuation allowance or to the estimated accrual for income taxes.

We record tax benefits when it is more likely than not that the tax return position taken with respect to a particular transaction will be sustained. A liability, if recorded, is not considered resolved until the statute of limitations for the relevant taxing authority to examine and challenge the tax position has expired, or the tax position is ultimately settled through examination, negotiation, or litigation. We classify interest and penalties associated with uncertain tax positions in our provision for income taxes.

Derivative Financial Instruments

On October 29, 2012, we acquired a noncontrolling equity interest in MCCI Holdings, LLC, or MCCI, a privately held Medical Services Organization, or MSO, headquartered in Miami, Florida, that primarily coordinates medical care for Medicare Advantage beneficiaries in Florida, Texas and Georgia. Our agreement with MCCI includes a put option that would allow the controlling interest holder to put their interest to us beginning in 2018 as well as a call option that would allow us to purchase the controlling interest beginning in 2021. Accordingly, we recorded, at fair value, a liability and an asset associated with the put and call, respectively. Changes in the fair value of the liability and asset during the years ended December 31,2015, 2014, and 2013 were not material to our results of operations, financial condition, or cash flows.

At times, we may use interest-rate swap agreements to manage our exposure to interest rate risk. The differential between fixed and variable rates to be paid or received is accrued and recognized over the life of the agreements as adjustments to interest expense in the consolidated statements of income. We were not party to any interest-rate swap agreements in 2015, 2014, or 2013.

Related Party

As noted above, MCCI is a related party to Humana. In December 2015, we purchased a note receivable directly from a third-party bank syndicate related to the financing of MCCI's business and extended the exercise date of the put option to 2018 and the call option to 2021 as previously discussed. The $284 million note receivable bears interest at 10% annually, payable in quarterly installments, and matures in December 2020. We have also entered into a revolving note agreement providing a line of credit up to $55 million under which no amounts have been drawn. The note receivable is included with other long-term assets in our consolidated balance sheet and with purchases of investment securities in our consolidated statement of cash flows. The related interest income is included in investment income in our consolidated statement of income. MCCI provides services to Humana Medicare Advantage members under capitation contracts with our health plans. Under these capitation agreements with Humana, MCCI assumes the financial risk associated with these Medicare Advantage members. We also advanced MCCI $9 million, with repayment terms tied to the performance under the capitation agreements. We recognized benefits expense of approximately $1.0 billion in 2015, $962 million in 2014 and $873 million in 2013 under these capitation agreements with MCCI.

Stock-Based Compensation

We generally recognize stock-based compensation expense, as determined on the date of grant at fair value, on a straight-line basis over the period during which an employee is required to provide service in exchange for the award (the vesting period). In addition, for awards with both time and performance-based conditions, we generally recognize compensation expense on a straight line basis over the vesting period when it is probable that the performance condition will be achieved. However, prior to July 2, 2015, for awards granted to retirement eligible employees, compensation expense is recognized on a straight-line basis over the shorter of the requisite service period or the period from the date of grant to an employee’s eligible retirement date. For awards granted on or after July 2, 2015 to retirement eligible employees, we recognize expense on a straight-line basis over the service period (the vesting period). We estimate expected forfeitures and recognize compensation expense only for those awards which are expected to vest. We estimate the grant-date fair value of stock options using the Black-Scholes option-pricing model. In addition, we report certain tax effects of stock-based compensation as a financing activity rather than an operating activity in the consolidated statement of cash flows. Additional detail regarding our stock-based compensation plans is included in Note 13.

Earnings Per Common Share

We compute basic earnings per common share on the basis of the weighted-average number of unrestricted common shares outstanding. Diluted earnings per common share is computed on the basis of the weighted-average number of unrestricted common shares outstanding plus the dilutive effect of outstanding employee stock options and restricted shares, or units, using the treasury stock method.

Fair Value

Assets and liabilities measured at fair value are categorized into a fair value hierarchy based on whether the inputs to valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our own assumptions about the assumptions market participants would use. The fair value hierarchy includes three levels of inputs that may be used to measure fair value as described below.

Level 1 – Quoted prices in active markets for identical assets or liabilities. Level 1 assets and liabilities include debt securities that are traded in an active exchange market.

Level 2 – Observable inputs other than Level 1 prices such as quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments as well as debt securities whose value is determined using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data.

Level 3 – Unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities. Level 3 includes assets and liabilities whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques reflecting our own assumptions about the assumptions market participants would use as well as those requiring significant management judgment.

Fair value of actively traded debt securities are based on quoted market prices. Fair value of other debt securities are based on quoted market prices of identical or similar securities or based on observable inputs like interest rates generally using a market valuation approach, or, less frequently, an income valuation approach and are generally classified as Level 2. We obtain at least one price for each security from a third party pricing service. These prices are generally derived from recently reported trades for identical or similar securities, including adjustments through the reporting date based upon observable market information. When quoted prices are not available, the third party pricing service may use quoted market prices of comparable securities or discounted cash flow analyses, incorporating inputs that are currently observable in the markets for similar securities. Inputs that are often used in the valuation methodologies include benchmark yields, reported trades, credit spreads, broker quotes, default rates, and prepayment speeds. We are responsible for the determination of fair value and as such we perform analysis on the prices received from the third party pricing service to determine whether the prices are reasonable estimates of fair value. Our analysis includes a review of monthly price fluctuations as well as a quarterly comparison of the prices received from the pricing service to prices reported by our third party investment advisor. In addition, on a quarterly basis we examine the underlying inputs and assumptions for a sample of individual securities across asset classes, credit rating levels, and various durations.

Fair value of privately held debt securities, as well as auction rate securities, are estimated using a variety of valuation methodologies, including both market and income approaches, where an observable quoted market does not exist and are generally classified as Level 3. For privately-held debt securities, such methodologies include reviewing the value ascribed to the most recent financing, comparing the security with securities of publicly-traded companies in similar lines of business, and reviewing the underlying financial performance including estimating discounted cash flows. Auction rate securities are debt instruments with interest rates that reset through periodic short-term auctions. From time to time, liquidity issues in the credit markets have led to failed auctions. Given the liquidity issues, fair value could not be estimated based on observable market prices, and as such, unobservable inputs were used. For auction rate securities, valuation methodologies include consideration of the quality of the sector and issuer, underlying collateral, underlying final maturity dates, and liquidity.

Recently Issued Accounting Pronouncements

In January 2016, the Financial Accounting Standards Board, or FASB, issued new guidance related to classification and measurement of financial instruments which requires equity securities that are not accounted for using the equity method or that do not result in consolidation, to be accounted for at fair value with changes in fair value recognized through net income. The new guidance is effective for us beginning with annual and interim periods in 2018 with early adoption permitted under certain circumstances. We are currently evaluating the impact, if any, on our results of operations, financial position, and cash flows.

In November 2015, the FASB issued new guidance related to accounting for income taxes which changes the balance sheet classification of deferred taxes, requiring deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position. The new guidance is effective for us beginning with annual and interim periods in 2017, with early adoption permitted. We elected to early adopt the guidance and have classified all deferred tax liabilities and assets as noncurrent in our consolidated balance sheet at December 31, 2015 to simplify their presentation. Prior periods were not retrospectively adjusted. The adoption of the new guidance did not have any impact on our results of operations or cash flows.

In May 2015, the FASB issued new guidance requiring insurance entities to provide additional disclosures about claim liabilities including paid claims development information by accident year and claim frequency data and related methodologies. The guidance is effective for us beginning with the 2016 annual reporting period and interim periods beginning in 2017. We are currently evaluating the impact the new guidance will have on our disclosures.

In April 2015, the FASB issued new guidance to help entities determine whether a cloud computing arrangement contains a software license that should be accounted for as internal-use software or as a service contract. The guidance is effective for us beginning with interim and annual reporting periods in 2016, with early adoption permitted. Upon adoption, an entity has the option to apply the provisions either prospectively to all arrangements entered into or materially modified, or retrospectively. We are currently evaluating the impact, if any, on our results of operations, financial position, and cash flows.

In March 2015, the FASB issued new guidance which changes the presentation of debt issuance costs from an asset to a direct reduction of the related debt liability. The new guidance is effective for us beginning with annual and interim periods in 2016 with early adoption permitted. The adoption of the new guidance will not have a material impact on our results of operations, financial condition, or cash flows.

In February 2015, the FASB issued an amendment to current consolidation guidance that modifies the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, eliminating the presumption that a general partner should consolidate a limited partnership, and affects the consolidation analysis of reporting entities that are involved with variable interest entities. The new guidance is effective for us beginning with interim and annual reporting periods in 2016, with early adoption permitted. All legal entities are subject to reevaluation under the revised consolidation model. We are currently evaluating the impact, if any, on our results of operations, financial position, and cash flows.

In May 2014, the FASB issued new guidance that amends the accounting for revenue recognition. The amendments are intended to provide a more robust framework for addressing revenue issues, improve comparability of revenue recognition practices, and improve disclosure requirements. Insurance contracts are not included in the scope of this new guidance. In July 2015, the FASB decided to defer the effective date provided in the new revenue guidance by one year. Giving effect to this deferral, the new guidance is effective for us beginning with annual and interim periods in 2018. We are currently evaluating the impact on our results of operations, financial condition, and cash flows.

There are no other recently issued accounting standards that apply to us or that are expected to have a material impact on our results of operations, financial condition, or cash flows.

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ACQUISITIONS AND DIVESTITURES

12 Months Ended

Dec. 31, 2015

Business Combinations [Abstract]

ACQUISITIONS AND DIVESTITURES

ACQUISITIONS AND DIVESTITURES

On June 1, 2015, we completed the sale of our wholly owned subsidiary, Concentra Inc., or Concentra, to MJ Acquisition Corporation, a joint venture between Select Medical Holdings Corporation and Welsh, Carson, Anderson & Stowe XII, L.P., a private equity fund, for approximately $1,055 million in cash, excluding approximately $22 million of transaction costs. In connection with the sale, we recognized a pre-tax gain, net of transaction costs, of $270 million which is reported as gain on sale of business in the accompanying condensed consolidated statements of income forthe year ended December 31, 2015.

In March 2015, we classified Concentra as held-for-sale and aggregated Concentra's assets and liabilities separately on the balance sheet, including a reclassification of the December 31, 2014 balance sheet for comparative purposes. The assets and liabilities of Concentra that were disposed of on June 1, 2015 and classified as held-for-sale as of December 31, 2014 were as follows:

	June 1, 2015		December 31, 2014
Assets	(in millions)
Receivables, net	$	130	$	115
Property and equipment, net	197		191
Goodwill	480		480
Other intangible assets, net	124		132
Other assets	27		25
Total assets disposed/held-for-sale	$	958	$	943
Liabilities
Trade accounts payable and accrued expenses	81		90
Other liabilities	114		116
Total liabilities disposed/held-for-sale	$	195	$	206
Net assets disposed	$	763	$	737

For the year ended December 31, 2015, the accompanying condensed consolidated statements of income include revenues related to Concentra of $411 million in 2015, $998 million in 2014, and $981 million in 2013.

On September 6, 2013, we acquired American Eldercare Inc., or American Eldercare, the largest provider of nursing home diversion services in the state of Florida, serving frail and elderly individuals in home and community-based settings. American Eldercare complements our core capabilities and strength in serving seniors and disabled individuals with a unique focus on individualized and integrated care, and has contracts to provide Medicaid long-term support services across the entire state of Florida. The enrollment effective dates for the various regions ranged from August 2013 to March 2014. The allocation of the purchase price resulted in goodwill of $76 million and other intangible assets of $75 million. The goodwill was assigned to the Retail segment. The other intangible assets, which primarily consist of customer contracts and technology, have a weighted average useful life of 9.3 years. Goodwill and other intangible assets are amortizable as deductible expenses for tax purposes.

The results of operations and financial condition of American Eldercare has been included in our consolidated statements of income and consolidated balance sheets from the acquisition date. In addition, during 2015, 2014 and 2013, we acquired other health and wellness and technology related businesses which, individually or in the aggregate, have not had a material impact on our results of operations, financial condition, or cash flows. The results of operations and financial condition of these businesses have been included in our condensed consolidated statements of income and condensed consolidated balance sheets from the respective acquisition dates. Acquisition-related costs recognized in each of 2015, 2014, and 2013 were not material to our results of operations. The pro forma financial information assuming the acquisitions had occurred as of the beginning of the calendar year prior to the year of acquisition, as well as the revenues and earnings generated during the year of acquisition, were not material for disclosure purposes.

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INVESTMENT SECURITIES

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Investment Securities

INVESTMENT SECURITIES

Investment securities classified as current and long-term were as follows at December 31, 2015 and 2014, respectively:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in millions)
December 31, 2015
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	331	$	2	$	(1	)	$	332
Mortgage-backed securities	1,902		12		(23		)	1,891
Tax-exempt municipal securities	2,611		61		(4		)	2,668
Mortgage-backed securities:
Residential	13		—		—			13
Commercial	1,024		2		(41		)	985
Asset-backed securities	264		1		(2		)	263
Corporate debt securities	2,873		140		(55		)	2,958
Total debt securities	$	9,018	$	218	$	(126	)	$	9,110
December 31, 2014
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	365	$	10	$	(1	)	$	374
Mortgage-backed securities	1,453		50		(5		)	1,498
Tax-exempt municipal securities	2,931		140		(3		)	3,068
Mortgage-backed securities:
Residential	17		—		—			17
Commercial	846		16		(19		)	843
Asset-backed securities	28		1		—			29
Corporate debt securities	3,432		299		(13		)	3,718
Total debt securities	$	9,072	$	516	$	(41	)	$	9,547

Gross unrealized losses and fair values aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position were as follows at December 31, 2015 and 2014, respectively:

	Less than 12 months					12 months or more					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	(in millions)
December 31, 2015
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	195	$	(1	)	$	14	$	—		$	209	$	(1	)
Mortgage-backed securities	1,484		(20		)	86		(3		)	1,570		(23		)
Tax-exempt municipal securities	843		(3		)	52		(1		)	895		(4		)
Mortgage-backed securities:
Residential	2		—			4		—			6		—
Commercial	626		(13		)	265		(28		)	891		(41		)
Asset-backed securities	258		(2		)	—		—			258		(2		)
Corporate debt securities	918		(45		)	63		(10		)	981		(55		)
Total debt securities	$	4,326	$	(84	)	$	484	$	(42	)	$	4,810	$	(126	)
December 31, 2014
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	79	$	—		$	80	$	(1	)	$	159	$	(1	)
Mortgage-backed securities	22		—			320		(5		)	342		(5		)
Tax-exempt municipal securities	131		(1		)	118		(2		)	249		(3		)
Mortgage-backed securities:
Residential	1		—			4		—			5		—
Commercial	31		(1		)	267		(18		)	298		(19		)
Asset-backed securities	13		—			—		—			13		—
Corporate debt securities	219		(6		)	128		(7		)	347		(13		)
Total debt securities	$	496	$	(8	)	$	917	$	(33	)	$	1,413	$	(41	)

Approximately 98% of our debt securities were investment-grade quality, with a weighted average credit rating of AA by S&P at December 31, 2015. Most of the debt securities that were below investment-grade were rated BB, the higher end of the below investment-grade rating scale. At December 31, 2015, 7% of our tax-exempt municipal securities were pre-refunded, generally with U.S. government and agency securities. Tax-exempt municipal securities that were not pre-refunded were diversified among general obligation bonds of U.S. states and local municipalities as well as special revenue bonds. General obligation bonds, which are backed by the taxing power and full faith of the issuer, accounted for 42% of the tax-exempt municipals that were not pre-refunded in the portfolio. Special revenue bonds, issued by a municipality to finance a specific public works project such as utilities, water and sewer, transportation, or education, and supported by the revenues of that project, accounted for the remaining 58% of these municipals. Our general obligation bonds are diversified across the United States with no individual state exceeding 11%. In addition, 6% of our tax-exempt securities were insured by bond insurers and had an equivalent weighted average S&P credit rating of AA exclusive of the bond insurers’ guarantee. Our investment policy limits investments in a single issuer and requires diversification among various asset types.

Residential mortgage back securities comprised approximately 98% of our agency mortgage-backed securities at December 31, 2015 and 99% at December 31, 2014.

The recoverability of our non-agency residential and commercial mortgage-backed securities is supported by factors such as seniority, underlying collateral characteristics and credit enhancements. These residential and commercial mortgage-backed securities at December 31, 2015 primarily were composed of senior tranches having high credit support, with over 99% of the collateral consisting of prime loans. The weighted average credit rating of all commercial mortgage-backed securities was AA+ at December 31, 2015.

The percentage of corporate securities associated with the financial services industry was 25% at December 31, 2015 and 21% at December 31, 2014.

Our unrealized loss from all securities was generated from approximately 690 positions out of a total of approximately 2,000 positions at December 31, 2015. All issuers of securities we own that were trading at an unrealized loss at December 31, 2015 remain current on all contractual payments. After taking into account these and other factors previously described, we believe these unrealized losses primarily were caused by an increase in market interest rates in the current markets than when the securities were purchased. At December 31, 2015, we did not intend to sell the securities with an unrealized loss position in accumulated other comprehensive income, and it is not likely that we will be required to sell these securities before recovery of their amortized cost basis. As a result, we believe that the securities with an unrealized loss were not other-than-temporarily impaired at December 31, 2015.

The detail of realized gains (losses) related to investment securities and included within investment income was as follows for the years ended December 31, 2015, 2014, and 2013:

	2015			2014			2013
	(in millions)
Gross realized gains	$	179		$	29		$	33
Gross realized losses	(33		)	(9		)	(11		)
Net realized capital gains	$	146		$	20		$	22

There were no material other-than-temporary impairments in 2015, 2014, or 2013.

The contractual maturities of debt securities available for sale at December 31, 2015, regardless of their balance sheet classification, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Amortized Cost		Fair Value
	(in millions)
Due within one year	$	438	$	439
Due after one year through five years	1,829		1,871
Due after five years through ten years	1,244		1,264
Due after ten years	2,304		2,384
Mortgage and asset-backed securities	3,203		3,152
Total debt securities	$	9,018	$	9,110

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FAIR VALUE

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

FAIR VALUE

FAIR VALUE

Financial Assets

The following table summarizes our fair value measurements at December 31, 2015 and 2014, respectively, for financial assets measured at fair value on a recurring basis:

			Fair Value Measurements Using
	Fair Value		Quoted Prices in Active Markets (Level 1)		Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
	(in millions)
December 31, 2015
Cash equivalents	$	2,229	$	2,229	$	—	$	—
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	332		—		332		—
Mortgage-backed securities	1,891		—		1,891		—
Tax-exempt municipal securities	2,668		—		2,663		5
Mortgage-backed securities:
Residential	13		—		13		—
Commercial	985		—		985		—
Asset-backed securities	263		—		263		—
Corporate debt securities	2,958		—		2,952		6
Total debt securities	9,110		—		9,099		11
Total invested assets	$	11,339	$	2,229	$	9,099	$	11
December 31, 2014
Cash equivalents	$	1,712	$	1,712	$	—	$	—
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	374		—		374		—
Mortgage-backed securities	1,498		—		1,498		—
Tax-exempt municipal securities	3,068		—		3,060		8
Mortgage-backed securities:
Residential	17		—		17		—
Commercial	843		—		843		—
Asset-backed securities	29		—		28		1
Corporate debt securities	3,718		—		3,695		23
Total debt securities	9,547		—		9,515		32
Total invested assets	$	11,259	$	1,712	$	9,515	$	32

There were no material transfers between Level 1 and Level 2 during 2015 or 2014.

Our Level 3 assets had a fair value of $11 million at December 31, 2015, or 0.1% of our total invested assets. During the years ended December 31, 2015, 2014, and 2013, the changes in the fair value of the assets measured using significant unobservable inputs (Level 3) were comprised of the following:

	For the years ended December 31,
	2015									2014								2013
	Private Placements			Auction Rate Securities			Total			Private Placements		Auction Rate Securities			Total			Private Placements			Auction Rate Securities		Total
	(in millions)
Beginning balance at January 1	$	24		$	8		$	32		$	24	$	13		$	37		$	25		$	13	$	38
Total gains or losses:
Realized in earnings	(1		)	—			(1		)	—		—			—			—			—		—
Unrealized in other comprehensive income	—			—			—			—		—			—			—			—		—
Purchases	—			—			—			—		—			—			—			—		—
Sales	(17		)	(3		)	(20		)	—		(5		)	(5		)	—			—		—
Settlements	—			—			—			—		—			—			(1		)	—		(1		)
Balance at December 31	$	6		$	5		$	11		$	24	$	8		$	32		$	24		$	13	$	37

Financial Liabilities

Our long-term debt, recorded at carrying value in our consolidated balance sheets, was $3,821 million at December 31, 2015 and $3,825 million at December 31, 2014. The fair value of our long-term debt was $3,986 million at December 31, 2015 and $4,102 million at December 31, 2014. The fair value of our long-term debt is determined based on Level 2 inputs, including quoted market prices for the same or similar debt, or if no quoted market prices are available, on the current prices estimated to be available to us for debt with similar terms and remaining maturities.

Due to the short-term nature, carrying value approximates fair value for our commercial paper borrowings.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

As disclosed in Note 3, we completed our acquisition of American Eldercare and other companies during 2015, 2014, and 2013. The values of net tangible assets acquired and the resulting goodwill and other intangible assets were recorded at fair value using Level 3 inputs. The majority of the related tangible assets acquired and liabilities assumed were recorded at their carrying values as of the respective dates of acquisition, as their carrying values approximated their fair values due to their short-term nature. The fair values of goodwill and other intangible assets acquired in these acquisitions were internally estimated primarily based on the income approach. The income approach estimates fair value based on the present value of the cash flows that the assets are expected to generate in the future. We developed internal estimates for the expected cash flows and discount rates in the present value calculations. Other than assets acquired and liabilities assumed in these acquisitions, there were no material assets or liabilities measured at fair value on a nonrecurring basis during 2015, 2014, or 2013.

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MEDICARE PART D

12 Months Ended

Dec. 31, 2015

Insurance [Abstract]

MEDICARE PART D

MEDICARE PART D

As discussed in Note 2, we cover prescription drug benefits in accordance with Medicare Part D under multiple contracts with CMS. The accompanying consolidated balance sheets include the following amounts associated with Medicare Part D as of December 31, 2015 and 2014. CMS subsidies/discounts in the table below include the reinsurance and low-income cost subsidies funded by CMS for which we assume no risk as well as brand name prescription drug discounts for Part D plan participants in the coverage gap funded by CMS and pharmaceutical manufacturers.

	2015						2014
	Risk Corridor Settlement			CMS Subsidies/ Discounts			Risk Corridor Settlement			CMS Subsidies/ Discounts
	(in millions)
Other current assets	$	25		$	2,082		$	105		$	1,690
Trade accounts payable and accrued expenses	(47		)	(63		)	(36		)	(32		)
Net current (liability) asset	$	(22	)	$	2,019		$	69		$	1,658

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HEALTH CARE REFORM

12 Months Ended

Dec. 31, 2015

Insurance [Abstract]

HEALTH CARE REFORM

HEALTH CARE REFORM

Operating results for our individual commercial medical business compliant with the Health Care Reform Law have been challenged primarily due to unanticipated modifications in the program subsequent to the passing of the Health Care Reform Law, resulting in higher covered population morbidity and the ensuing enrollment and claims issues causing volatility in claims experience. We took a number of actions in 2015 to improve the profitability of our individual commercial medical business in 2016.These actions were subject to regulatory restrictions in certain geographies and included premium increases for the 2016 coverage year related generally to the first half of 2015 claims experience, the discontinuation of certain products as well as exit of certain markets for 2016, network improvements, enhancements to claims and clinical processes and administrative cost control. Despite these actions, the deterioration in the second half of 2015 claims experience together with 2016 open enrollment results indicating the retention of many high-utilizing members for 2016 resulted in a probable future loss. As a result of our assessment of the profitability of our individual medical policies compliant with the Health Care Reform Law, in the fourth quarter of 2015, we recorded a provision for probable future losses (premium deficiency reserve) for the 2016 coverage year of $176 million in benefits payable in our consolidated balance sheet with a corresponding increase in benefits expense in our consolidated statement of income. The premium deficiency reserve includes the estimated benefit of approximately $340 million associated with risk corridor provisions expected for the 2016 coverage year.

On June 30, 2015 we received notification from CMS of risk adjustment and reinsurance settlement amounts for 2014. We revised our 2014 coverage year estimates to reflect actual amounts and also made a corresponding adjustment to our risk corridor estimate based on these results. The change in estimate for risk adjustment was substantially offset by the corresponding change in estimate for risk corridor, both of which are reflected as changes in premiums revenue in our consolidated statements of income. The change in estimate related to the 3Rs for the 2014 coverage year was a decline in the estimated net receivable of approximately $43 million for the year ended December 31, 2015. In addition, we revised our 3Rs estimates for the 2015 coverage year based on the data from CMS for 2014.

During the year ended December 31, 2015, we paid $186 million in risk adjustment charges and $1 million in risk corridor charges associated with the 2014 coverage year. We received payments of $521 million for reinsurance recoverables, $57 million for risk adjustment settlements, and $26 million for risk corridor settlements associated with the 2014 coverage year during the year ended December 31, 2015. We expect to collect the remaining risk adjustment receivable for the 2014 coverage year of approximately $4 million in 2016.

During 2015, we received our interim settlement associated with our risk corridor receivables for the 2014 coverage year. The interim settlement, representing only 12.6% of risk corridor receivables for the 2014 coverage year, was funded by HHS in accordance with previous guidance, utilizing funds HHS collected from us and other carriers under the 2014 risk corridor program. As discussed in Note 2, HHS provided guidance under the three year risk corridor program that future collections will first be applied to any shortfalls from previous coverage years before application to current year obligations. Risk corridor payables to issuers are obligations of the United States Government under the Health Care Reform law which requires the Secretary of HHS to make full payments to issuers. In the event of a shortfall at the end of the three year program, HHS has asserted it will explore other sources of funding for risk corridor payments, subject to the availability of appropriations. Based on the notice from CMS and collections in the fourth quarter of 2015, we classified our remaining gross risk corridor receivables for both the 2014 and 2015 coverage years as long-term because settlement is expected to exceed 12 months at December 31, 2015.

The accompanying consolidated balance sheets include the following amounts associated with the 3Rs at December 31, 2015 and December 31, 2014. Amounts classified as long-term represent settlements that we expect to exceed 12 months at December 31, 2015.

	2015							2014
	Risk Adjustment Settlement			Reinsurance Recoverables		Risk Corridor Settlement		Risk Adjustment Settlement			Reinsurance Recoverables		Risk Corridor Settlement
	(in millions)
2014 Coverage Year
Premiums receivable	$	4		$	—	$	—	$	131		$	—	$	—
Other current assets	—			—		—		—			586		55
Trade accounts payable and accrued expenses	—			—		—		(89		)	—		(4		)
Net current asset	4			—		—		42			586		51
Other long-term assets	—			—		215		—			—		—
Other long-term liabilities	—			—		—		—			—		—
Net long-term asset	—			—		215		—			—		—
Total 2014 coverage year net asset	4			—		215		42			586		51
2015 Coverage Year
Premiums receivable	122			—		—		—			—		—
Other current assets	—			610		—		—			—		—
Trade accounts payable and accrued expenses	(223		)	—		—		—			—		—
Net current (liability) asset	(101		)	610		—		—			—		—
Other long-term assets	10			—		244		—			—		—
Other long-term liabilities	—			—		—		—			—		—
Net long-term asset	10			—		244		—			—		—
Total 2015 coverage year net (liability) asset	(91		)	610		244		—			—		—
Total net (liability) asset	$	(87	)	$	610	$	459	$	42		$	586	$	51

In 2015, we paid the federal government $867 million for the annual health insurance industry fee attributed to calendar year 2015, in accordance with the Health Care Reform Law. In 2014, we paid the federal government $562 million for the annual health insurance industry fee attributed to calendar year 2014. This fee is not deductible for tax purposes.

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PROPERTY AND EQUIPMENT, NET

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

PROPERTY AND EQUIPMENT, NET

Property and equipment was comprised of the following at December 31, 2015 and 2014, excluding Concentra amounts classified as held-for-sale at December 31, 2014 for comparative purposes. Net property and equipment associated with Concentra and classified as held-for sale at December 31, 2014 was $191 million.

	2015			2014
	(in millions)
Land	$	20		$	18
Buildings and leasehold improvements	633			602
Equipment	645			631
Computer software	1,424			1,656
	2,722			2,907
Accumulated depreciation	(1,338		)	(1,679		)
Property and equipment, net	$	1,384		$	1,228

Depreciation expense was $354 million in 2015, $328 million in 2014, and $309 million in 2013, including amortization expense for capitalized internally developed and purchased software of $220 million in 2015, $191 million in 2014, and $172 million in 2013.

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GOODWILL AND OTHER INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

GOODWILL AND OTHER INTANGIBLE ASSETS

The carrying amounts of goodwill for our reportable segments have been retrospectively adjusted as of January 1, 2014 to conform to the 2015 segment change discussed in Note 2. Changes in the carrying amount of goodwill for our reportable segments for the years ended December 31, 2015 and 2014 were as follows:

	Retail		Group		Healthcare Services			Total
	(in millions)
Balance at January 1, 2014	$	1,069	$	385	$	1,799		$	3,253
Acquisitions	—		—		19			19
Dispositions	—		—		(40		)	(40		)
Subsequent payments/adjustments	—		—		(1		)	(1		)
Balance at December 31, 2014	1,069		385		1,777			3,231
Acquisitions	—		—		35			35
Dispositions	—		—		(1		)	(1		)
Balance at December 31, 2015	$	1,069	$	385	$	1,811		$	3,265

Healthcare Services segment goodwill of $480 million associated with the sale of Concentra was reclassified to assets held-for-sale as of January 1, 2014 for comparative purposes and excluded from the table above. This $480 million of goodwill was disposed of on June 1, 2015 with the completion of the sale of Concentra.

The following table presents details of our other intangible assets included in other long-term assets in the accompanying consolidated balance sheets at December 31, 2015 and 2014 and excludes Concentra amounts classified as held-for-sale as of December 31, 2014 for comparative purposes. Net other intangible assets associated with Concentra and classified as held-for-sale at December 31, 2014 were $132 million.

	Weighted Average Life	2015						2014
		Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
		(in millions)
Other intangible assets:
Customer contracts/relationships	9.8 years	$	566	$	292	$	274	$	657	$	326	$	331
Trade names and technology	8.3 years	104		54		50		115		50		65
Provider contracts	14.6 years	51		24		27		52		21		31
Noncompetes and other	8.2 years	32		26		6		41		28		13
Total other intangible assets	9.8 years	$	753	$	396	$	357	$	865	$	425	$	440

Amortization expense for other intangible assets was approximately $93 million in 2015, $121 million in 2014, and $117 million in 2013. The following table presents our estimate of amortization expense for each of the five next succeeding fiscal years:

	(in millions)
For the years ending December 31,:
2016	$	78
2017	71
2018	62
2019	51
2020	47

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BENEFITS PAYABLE

12 Months Ended

Dec. 31, 2015

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

BENEFITS PAYABLE

BENEFITS PAYABLE

Activity in benefits payable, excluding military services, was as follows for the years ended December 31, 2015, 2014 and 2013:

	2015			2014			2013
	(in millions)
Balances at January 1	$	4,475		$	3,893		$	3,775
Less: Reinsurance recoverables	(78		)	—			—
Balances at January 1, net	4,397			3,893			3,775
Acquisitions	—			—			5
Incurred related to:
Current year	44,397			38,641			32,711
Prior years	(236		)	(518		)	(474		)
Total incurred	44,161			38,123			32,237
Paid related to:
Current year	(39,802		)	(34,357		)	(29,103		)
Prior years	(4,041		)	(3,262		)	(3,021		)
Total paid	(43,843		)	(37,619		)	(32,124		)
Premium deficiency reserve	176			—			—
Reinsurance recoverable	85			78			—
Balances at December 31	$	4,976		$	4,475		$	3,893

Amounts incurred related to prior years vary from previously estimated liabilities as the claims ultimately are settled. Negative amounts reported for incurred related to prior years result from claims being ultimately settled for amounts less than originally estimated (favorable development).

Actuarial standards require the use of assumptions based on moderately adverse experience, which generally results in favorable reserve development, or reserves that are considered redundant. We experienced favorable medical claims reserve development related to prior fiscal years of $236 million in 2015, $518 million in 2014, and $474 million in 2013. The favorable medical claims reserve development for 2015, 2014, and 2013 primarily reflects the consistent application of trend and completion factors estimated using an assumption of moderately adverse conditions. The decline in favorable prior period development in 2015 primarily was due to the impact of lower financial claim recoveries due in part to our gradual implementation during 2014 of inpatient authorization review prior to admission as opposed to post adjudication, as well as higher than expected flu associated claims from the fourth quarter of 2014 and continued volatility in claims associated with individual commercial medical products. The higher favorable prior period development during 2014 and 2013 resulted from increased membership, better than originally expected utilization across most of our major business lines and increased financial recoveries. The increase in financial recoveries primarily resulted from claim audit process enhancements as well as increased volume of claim audits and expanded audit scope. All lines of business benefited from these improvements.

Benefits expense excluded from the previous table was as follows for the years ended December 31, 2015, 2014 and 2013:

	2015			2014		2013
	(in millions)
Premium deficiency reserve for short-duration policies	$	176		$	—	$	—
Military services	12			11		(27		)
Future policy benefits	(80		)	32		354
Total	$	108		$	43	$	327

In the fourth quarter of 2015, we recognized a premium deficiency reserve for our individual commercial medical business compliant with the Health Care Reform Law associated with the 2016 coverage year as discussed in more detail in Note 7.

Military services benefits expense for 2015 and 2014 reflect expenses associated with our contracts with the Veterans Administration. Military services benefits expense for 2013 reflects the beneficial effect of a favorable settlement of contract claims with the DoD partially offset by expenses associated with our contracts with the Veterans Administration.

The decrease in benefits expense associated with future policy benefits payable in 2015 primarily reflects the release of reserves as individual commercial medical members transitioned to plans compliant with the Health Care Reform Law. The higher benefits expense associated with future policy benefits payable during 2013 relates to reserve strengthening for our closed block of long-term care insurance policies acquired in connection with the 2007 KMG America Corporation, or KMG, acquisition more fully described in Note 18.

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INCOME TAXES

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The provision for income taxes consisted of the following for the years ended December 31, 2015, 2014 and 2013:

	2015			2014			2013
	(in millions)
Current provision:
Federal	$	1,067		$	1,006		$	595
States and Puerto Rico	90			81			53
Total current provision	1,157			1,087			648
Deferred (benefit) provision	(2		)	(64		)	42
Provision for income taxes	$	1,155		$	1,023		$	690

The provision for income taxes was different from the amount computed using the federal statutory rate for the years ended December 31, 2015, 2014 and 2013 due to the following:

	2015			2014			2013
	(in millions)
Income tax provision at federal statutory rate	$	851		$	759		$	672
States, net of federal benefit, and Puerto Rico	44			48			32
Tax exempt investment income	(24		)	(27		)	(26		)
Health insurer fee	314			204			—
Nondeductible executive compensation	18			22			6
Concentra sale	(67		)	—			—
Other, net	19			17			6
Provision for income taxes	$	1,155		$	1,023		$	690

The provision for income taxes for 2015, 2014, and 2013 reflects an $18 million, $22 million, and $6 million, respectively, estimated impact from limitations on the deductibility of annual compensation in excess of $500,000 per employee as mandated by the Health Care Reform Law. As of December 31, 2015, we do not have material uncertain tax positions reflected in our consolidated balance sheet.

Deferred income tax balances reflect the impact of temporary differences between the tax bases of assets or liabilities and their reported amounts in our consolidated financial statements, and are stated at enacted tax rates expected to be in effect when the reported amounts are actually recovered or settled. Principal components of our net deferred tax balances at December 31, 2015 and 2014 were as follows, excluding Concentra amounts classified as held-for-sale at December 31, 2014 for comparative purposes. The net deferred tax liability associated with Concentra and classified as held-for sale at December 31, 2014 was $55 million.

	Assets (Liabilities)
	2015			2014
	(in millions)
Future policy benefits payable	$	200		$	320
Compensation and other accrued expenses	130			168
Benefits payable	267			138
Net operating loss carryforward	47			52
Deferred acquisition costs	64			57
Unearned revenues	22			21
Other	13			17
Total deferred income tax assets	743			773
Valuation allowance	(42		)	(48		)
Total deferred income tax assets, net of valuation allowance	701			725
Depreciable property and intangible assets	(363		)	(346		)
Investment securities	(37		)	(168		)
Prepaid expenses	(45		)	(55		)
Total deferred income tax liabilities	(445		)	(569		)
Total net deferred income tax assets	$	256		$	156
Amounts recognized in the consolidated balance sheets:
Other current assets	$	—		$	79
Other long-term assets	256			77
Total net deferred income tax assets	$	256		$	156

In November 2015, the FASB issued new guidance related to accounting for income taxes which changes the balance sheet classification of deferred taxes, requiring deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position.We elected to early adopt the guidance and have classified all deferred tax liabilities and assets as noncurrent in our consolidated balance sheet at December 31, 2015 to simplify their presentation. Prior periods were not retrospectively adjusted. If we had retrospectively adjusted our consolidated balance sheet, our other current assets would have declined by $79 million and, similarly, our other long-term assets would have increased by $79 million at December 31, 2014.

At December 31, 2015, we had approximately $126 million of net operating losses to carry forward related to prior acquisitions and our Puerto Rico subsidiaries. These net operating loss carryforwards, if not used to offset future taxable income, will expire from 2016 through 2033. Due to limitations and uncertainty regarding our ability to use some of the carryforwards, a valuation allowance was established on $105 million of these net operating loss carryforwards and $7 million of other items related to Puerto Rico. For the remainder of the net operating loss carryforwards and other cumulative temporary differences, based on our historical record of producing taxable income and profitability, we have concluded that future operating income will be sufficient to give rise to tax expense to recover all deferred tax assets.

We provide for income taxes on the undistributed earnings of our Puerto Rico operations using that jurisdiction’s tax rate, which has been lower historically than the U.S. statutory tax rate. Permanent investment of these earnings has resulted in cumulative unrecognized deferred tax liabilities of approximately $30 million as of December 31, 2015.

We file income tax returns in the United States and certain foreign jurisdictions. The U.S. Internal Revenue Service, or IRS, has completed its examinations of our consolidated income tax returns for 2013 and prior years. Our 2014 tax return is in the post-filing review period under the Compliance Assurance Process (CAP). Our 2015 tax return is under advance review by the IRS under CAP. With few exceptions, which are immaterial in the aggregate, we no longer are subject to state, local and foreign tax examinations for years before 2012. As of December 31, 2015, we are not aware of any material adjustments that may be proposed.

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DEBT

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

DEBT

DEBT

The carrying value of long-term debt outstanding was as follows at December 31, 2015 and 2014:

	2015		2014
	(in millions)
Long-term debt:
Senior notes:
$500 million, 7.20% due June 15, 2018	$	503	$	504
$300 million, 6.30% due August 1, 2018	309		312
$400 million, 2.625% due October 1, 2019	400		400
$600 million, 3.15% due December 1, 2022	598		598
$600 million, 3.85% due October 1, 2024	599		599
$250 million, 8.15% due June 15, 2038	266		266
$400 million, 4.625% due December 1, 2042	400		400
$750 million, 4.95% due October 1, 2044	746		746
Total long-term debt	$	3,821	$	3,825

Senior Notes

In September 2014, we issued $400 million of 2.625% senior notes due October 1, 2019, $600 million of 3.85% senior notes due October 1, 2024 and $750 million of 4.95% senior notes due October 1, 2044. Our net proceeds, reduced for the underwriters' discount and commission and offering expenses, were $1.73 billion. We used a portion of the net proceeds to redeem the $500 million 6.45% senior unsecured notes as discussed below.

In October 2014, we redeemed the $500 million 6.45% senior unsecured notes due June 1, 2016, at 100%of the principal amount plus applicable premium for early redemption and accrued and unpaid interest to the redemption date, for cash totaling approximately $560 million. We recognized a loss on extinguishment of debt of approximately $37 million in October 2014 for the redemption of these notes.

Our senior notes, which are unsecured, may be redeemed at our option at any time at 100% of the principal amount plus accrued interest and a specified make-whole amount. The 7.20% and 8.15% senior notes are subject to an interest rate adjustment if the debt ratings assigned to the notes are downgraded (or subsequently upgraded). In addition, our senior notes (other than the 6.30% senior notes) contain a change of control provision that may require us to purchase the notes under certain circumstances. On July 2, 2015 we entered into a Merger Agreement with Aetna that, when closed, may require redemption of the notes if the notes are downgraded below investment grade by both Standard & Poor’s Rating Services, or S&P and Moody’s Investors Services, Inc., or Moody’s.

Prior to 2009, we were parties to interest-rate swap agreements that exchanged the fixed interest rate under our senior notes for a variable interest rate based on LIBOR. As a result, the carrying value of the senior notes was adjusted to reflect changes in value caused by an increase or decrease in interest rates. During 2008, we terminated all of our swap agreements. The cumulative adjustment to the carrying value of our senior notes was $103 million as of the termination date which is being amortized as a reduction to interest expense over the remaining term of the senior notes. In October 2014, the redemption of our 6.45% senior notes reduced the unamortized carrying value adjustment by $12 million. The unamortized carrying value adjustment was $28 million as of December 31, 2015 and $32 million as of December 31, 2014.

Credit Agreement

Our5-year$1.0 billionunsecured revolving credit agreement expires July 2018. Under the credit agreement, at our option, we can borrow on either a competitive advance basis or a revolving credit basis. The revolving credit portion bears interest at either LIBOR plus a spread or the base rate plus a spread. The LIBOR spread, currently110basis points, varies depending on our credit ratings ranging from 90 to 150basis points. We also pay an annual facility fee regardless of utilization. This facility fee, currently15basis points, may fluctuate between10 and 25basis points, depending upon our credit ratings. The competitive advance portion of any borrowings will bear interest at market rates prevailing at the time of borrowing on either a fixed rate or a floating rate based on LIBOR, at our option.

The terms of the credit agreement include standard provisions related to conditions of borrowing, including a customary material adverse effect clause which could limit our ability to borrow additional funds. In addition, the credit agreement contains customary restrictive and financial covenants as well as customary events of default, including financial covenants regarding the maintenance of a minimum level of net worth of $8.5 billionat December 31, 2015and a maximum leverage ratio of 3.0:1. We are in compliance with the financial covenants, with actual net worth of$10.3 billionand an actual leverage ratio of 1.3:1, as measured in accordance with the credit agreement as of December 31,2015. In addition, the credit agreement includes an uncommitted $250 million incremental loan facility.

At December 31, 2015, we had no borrowings outstanding under the credit agreement and we had outstanding letters of credit of $1 million secured under the credit agreement. No amounts have been drawn on these letters of credit. Accordingly, as of December 31, 2015, we had $999 million of remaining borrowing capacity under the credit agreement, none of which would be restricted by our financial covenant compliance requirement. We have other customary, arms-length relationships, including financial advisory and banking, with some parties to the credit agreement.

Commercial Paper

In October 2014, we entered into a commercial paper program pursuant to which we may issue short-term, unsecured commercial paper notes privately placed on a discount basis through certain broker dealers. Amounts available under the program may be borrowed, repaid and re-borrowed from time to time, with the aggregate face or principal amount outstanding under the program at any time not to exceed $1 billion. The net proceeds of issuances have been and are expected to be used for general corporate purposes. The maximum principal amount outstanding at any one time during the year endedDecember 31, 2015 was $414 million, with $299 million outstanding at December 31, 2015. There were no outstanding borrowings at December 31, 2014.

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EMPLOYEE BENEFIT PLANS

12 Months Ended

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS

Employee Savings Plan

We have defined contribution retirement savings plans covering eligible employees which include matching contributions based on the amount of our employees’ contributions to the plans. The cost of these plans amounted to approximately $188 million in 2015, $176 million in 2014, and $155 million in 2013. The Company’s cash match is invested pursuant to the participant’s contribution direction. Based on the closing price of our common stock of $178.51 on December 31, 2015, approximately 13% of the retirement and savings plan’s assets were invested in our common stock, or approximately 2.5 million shares, representing 2% of the shares outstanding as of December 31, 2015. At December 31, 2015, approximately 3.4 million shares of our common stock were reserved for issuance under our defined contribution retirement savings plans.

Stock-Based Compensation

We have plans under which options to purchase our common stock and restricted stock units have been granted to executive officers, directors and key employees. For awards granted prior to July 2, 2015, our equity award agreements generally contain provisions whereby the awards automatically accelerate and vest upon change in control, including those granted to retirement-eligible participants described below. The Merger discussed in Note 2 qualifies as a change in control event under our equity award agreements. Awards granted on or after July 2, 2015 would generally require both a change in control and termination of employment within 2 years of the date of the change in control to accelerate the vesting, including those granted to retirement-eligible participants.

The terms and vesting schedules for stock-based awards vary by type of grant. Generally, the awards vest upon time-based conditions. We have also granted awards to certain employees that vest upon a combination of time and performance-based conditions. The stock awards of retirement-eligible participants granted prior to July 2, 2015 generally will continue to fully vest on the originally scheduled vest date upon retirement from the Company. For stock awards of retirement-eligible employees granted on or after July 2, 2015, awards are generally earned ratably over the service period for each tranche. Accordingly, upon retirement the earned portion of the current tranche will continue to vest on the originally scheduled vest date and any remaining unearned portion of the award will be forfeited. Our equity award program includes a retirement provision that generally treats employees with a combination of age and years of services with the Company totaling 65 or greater, with a minimum required age of 55 and a minimum requirement of 5 years of service, as retirement-eligible. Upon exercise, stock-based compensation awards are settled with authorized but unissued company stock or treasury stock.

The compensation expense that has been charged against income for these plans was as follows for the years ended December 31,2015, 2014, and 2013:

	2015			2014			2013
	(in millions)
Stock-based compensation expense by type:
Restricted stock	$	99		$	91		$	84
Stock options	10			7			8
Total stock-based compensation expense	109			98			92
Tax benefit recognized	(26		)	(22		)	(22		)
Stock-based compensation expense, net of tax	$	83		$	76		$	70

The tax benefit recognized in our consolidated financial statements is based on the amount of compensation expense recorded for book purposes, subject to limitations on the deductibility of annual compensation in excess of $500,000 per employee as mandated by the Health Care Reform Law. The actual tax benefit realized in our tax return is based on the intrinsic value, or the excess of the market value over the exercise or purchase price, of stock options exercised and restricted stock vested during the period, subject to limitations on the deductibility of annual compensation in excess of $500,000 per employee as mandated by the Health Care Reform Law. The actual tax benefit realized for the deductions taken on our tax returns from option exercises and restricted stock vesting totaled $34 million in 2015, $30 million in 2014, and $20 million in 2013. There was no capitalized stock-based compensation expense during these years.

At December 31, 2015, there were 18.1 million shares reserved for stock award plans. These reserved shares included giving effect to, under the 2011 Plan, 8.7 million shares of common stock available for future grants assuming all stock options were granted or 3.8 million shares available for future grants assuming all restricted stock were granted. Shares may be issued from authorized but unissued company stock or treasury stock.

Restricted Stock

Restricted stock is granted with a fair value equal to the market price of our common stock on the date of grant and generally vests three years from the date of grant. Restricted stock granted on or after July 2, 2015, generally vests in equal annual tranches over a three year period from the date of grant. Certain of our restricted stock units also include performance-based conditions generally associated with strategic membership growth and return on invested capital. Restricted stock units have forfeitable dividend equivalent rights equal to the dividend paid on common stock. The weighted-average grant date fair value of our restricted stock was $165.26 in 2015, $103.57 in 2014, and $73.50 in 2013. Activity for our restricted stock was as follows for the year ended December 31, 2015:

	Shares		Weighted- Average Grant-Date Fair Value
	(shares in thousands)
Nonvested restricted stock at December 31, 2014	3,635		$	85.52
Granted	837		165.26
Vested	(919	)	84.95
Forfeited	(188	)	98.92
Nonvested restricted stock at December 31, 2015	3,365		$	104.58

Approximately 30% of the nonvested restricted stock at December 31, 2015 included performance-based conditions.

The fair value of shares vested was $153 million during 2015, $99 million during 2014, and $52 million during 2013. Total compensation expense not yet recognized related to nonvested restricted stock was $88 million at December 31, 2015. We expect to recognize this compensation expense over a weighted-average period of approximately 1.4 years. There are no other contractual terms covering restricted stock once vested.

Stock Options

Stock options are granted with an exercise price equal to the fair market value of the underlying common stock on the date of grant. Our stock plans, as approved by the Board of Directors and stockholders, define fair market value as the average of the highest and lowest stock prices reported on the composite tape by the New York Stock Exchange on a given date. Exercise provisions vary, but most options vest in whole or in part 1 to 3 years after grant and expire 7 years after grant.

The weighted-average fair value of each option granted during 2015, 2014, and 2013 is provided below. The fair value was estimated on the date of grant using the Black-Scholes pricing model with the weighted-average assumptions indicated below:

	2015			2014			2013
Weighted-average fair value at grant date	$	36.91		$	22.45		$	21.80
Expected option life (years)	4.2 years			4.3 years			4.4 years
Expected volatility	27.4		%	27.6		%	38.8		%
Risk-free interest rate at grant date	1.4		%	1.3		%	0.8		%
Dividend yield	0.7		%	1.1		%	1.5		%

When valuing employee stock options, we stratify the employee population into three homogenous groups that historically have exhibited similar exercise behaviors. These groups are executive officers, directors, and all other employees. We value the stock options based on the unique assumptions for each of these employee groups.

We calculate the expected term for our employee stock options based on historical employee exercise behavior and base the risk-free interest rate on a traded zero-coupon U.S. Treasury bond with a term substantially equal to the option’s expected term.

The volatility used to value employee stock options is based on historical volatility. We calculate historical volatility using a simple-average calculation methodology based on daily price intervals as measured over the expected term of the option.

Activity for our option plans was as follows for the year ended December 31, 2015:

	Shares  Under Option		Weighted-Average Exercise Price
	(shares in thousands)
Options outstanding at December 31, 2014	768		$	82.45
Granted	377		164.80
Exercised	(304	)	76.25
Forfeited	(6	)	83.58
Options outstanding at December 31, 2015	835		$	121.89
Options exercisable at December 31, 2015	203		$	78.30

As of December 31, 2015, outstanding stock options, substantially all of which are expected to vest, had an aggregate intrinsic value of $48 million, and a weighted-average remaining contractual term of 5.0 years. As of December 31, 2015, exercisable stock options had an aggregate intrinsic value of $20 million, and a weighted-average remaining contractual term of 3.5 years. The total intrinsic value of stock options exercised during 2015 was $28 million, compared with $32 million during 2014 and $39 million during 2013. Cash received from stock option exercises totaled $23 million in 2015, $52 million in 2014, and $67 million in 2013.

Total compensation expense not yet recognized related to nonvested options was $10 million at December 31, 2015. We expect to recognize this compensation expense over a weighted-average period of approximately 1.9 years.

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EARNINGS PER COMMON SHARE COMPUTATION

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

EARNINGS PER COMMON SHARE COMPUTATION

EARNINGS PER COMMON SHARE COMPUTATION

Detail supporting the computation of basic and diluted earnings per common share was as follows for the years ended December 31, 2015, 2014 and 2013:

	2015		2014		2013
	(dollars in millions, except per common share results, number of shares/options in thousands)
Net income available for common stockholders	$	1,276	$	1,147	$	1,231
Weighted-average outstanding shares of common stock used to compute basic earnings per common share	149,455		154,187		157,503
Dilutive effect of:
Employee stock options	192		230		322
Restricted stock	1,495		1,457		1,326
Shares used to compute diluted earnings per common share	151,142		155,874		159,151
Basic earnings per common share	$	8.54	$	7.44	$	7.81
Diluted earnings per common share	$	8.44	$	7.36	$	7.73
Number of antidilutive stock options and restricted stock awards excluded from computation	415		320		704

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STOCKHOLDERS' EQUITY

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

STOCKHOLDERS' EQUITY

STOCKHOLDERS’ EQUITY

Dividends

The following table provides details of dividend payments, excluding dividend equivalent rights, in 2013, 2014, and 2015 under our Board approved quarterly cash dividend policy:

Payment Date	Amount per Share	Total Amount
		(in millions)
2013	$1.06	$167
2014	$1.10	$170
2015	$1.14	$170

The Merger Agreement discussed in Note 2 does not impact our ability and intent to continue quarterly dividend payments prior to the closing of the Merger consistent with our historical dividend payments. Under the terms of the Merger Agreement, we have agreed with Aetna that our quarterly dividend will not exceed $0.29 per share prior to the closing of the Merger. Declaration and payment of future quarterly dividends is at the discretion of our Board and may be adjusted as business needs or market conditions change. In addition, under the terms of the Merger Agreement, we have agreed with Aetna to coordinate the declaration and payment of dividends so that our stockholders do not fail to receive a quarterly dividend around the time of the closing of the Merger.

On October 29, 2015, the Board declared a cash dividend of $0.29 per share that was paid on January 29, 2016 to stockholders of record on December 30, 2015, for an aggregate amount of $43 million.

Stock Repurchases

In September 2014, our Board of Directors replaced a previous share repurchase authorization of up to $1 billion (of which $816 million remained unused) with a new current authorization for repurchases of up to $2 billion of our common shares exclusive of shares repurchased in connection with employee stock plans, expiring on December 31, 2016. Under the share repurchase authorization, shares may be purchased from time to time at prevailing prices in the open market, by block purchases, through plans designed to comply with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended, or in privately-negotiated transactions (including pursuant to accelerated share repurchase agreements with investment banks), subject to certain regulatory restrictions on volume, pricing, and timing. Pursuant to the Merger Agreement, after July 2, 2015, we are prohibited from repurchasing any of our outstanding securities without the prior written consent of Aetna, other than repurchases of shares of our common stock in connection with the exercise of outstanding stock options or the vesting or settlement of outstanding restricted stock awards. Accordingly, as announced on July 3, 2015, we have suspended our share repurchase program. Our remaining repurchase authorization was$1.04 billion as of July 3, 2015.

Excluding shares acquired in connection with employee stock plans as well as 0.36 million shares received in March 2015 upon final settlement of our accelerated share repurchase agreement, or ASR Agreement, described below for which no cash was paid during the period, share repurchases were as follows during the years ended December 31, 2015, 2014 and 2013:

			Year Ended December 31,
			2015			2014				2013
Authorization Date	Purchase Not to Exceed		Shares	Cost		Shares	Cost			Shares	Cost
	(in millions)
September 2014	$	2,000	1.85	$	329	4.10	$	635	(a)	—	$	—
April 2014	1,000		—	—		1.50	184			—	—
April 2013	1,000		—	—		0.10	11			4.55	420
April 2012	1,000		—	—		—	—			1.22	82
Total repurchases			1.85	$	329	5.70	$	830		5.77	$	502

(a) Includes $100 millionheld back by Goldman Sachs pending final settlement of the ASR

Agreement in March 2015 at which time we received an additional 0.36 million shares which

are excluded from the table above.

On November 7, 2014, we announced that we had entered into an accelerated share repurchase agreement, or ASR Agreement, with Goldman, Sachs & Co., or Goldman Sachs, to repurchase $500 million of our common stock as part of the $2 billion share repurchase program authorized in September 2014. Under the ASR Agreement, on November 10, 2014, we made a payment of $500 million to Goldman Sachs from available cash on hand and received an initial delivery of 3.06 million shares of our common stock from Goldman Sachs based on the then current market price of Humana common stock.  The payment to Goldman Sachs was recorded as a reduction to stockholders’ equity, consisting of a$400 million increase in treasury stock, which reflected the value of the initial 3.06 million shares received upon initial settlement, and a $100 million decrease in capital in excess of par value, which reflected the value of stock held back by Goldman Sachs pending final settlement of the ASR Agreement. Upon settlement of the ASR on March 13, 2015, we received an additional 0.36 million shares as determined by the average daily volume weighted-average share price of our common stock during the term of the ASR Agreement of $146.21,bringing the total shares received under this program to3.42 million. In addition, upon settlement we reclassified the $100 million value of stock initially held back by Goldman Sachs from capital in excess of par value to treasury stock.

In connection with employee stock plans, we acquired 0.3 million common shares for $56 million in 2015, 0.4 million common shares for $42 million in 2014, and 0.3 million common shares for $29 million in 2013.

Regulatory Requirements

Certain of our subsidiaries operate in states that regulate the payment of dividends, loans, or other cash transfers to Humana Inc., our parent company, and require minimum levels of equity as well as limit investments to approved securities. The amount of dividends that may be paid to Humana Inc. by these subsidiaries, without prior approval by state regulatory authorities, or ordinary dividends, is limited based on the entity’s level of statutory income and statutory capital and surplus. In most states, prior notification is provided before paying a dividend even if approval is not required.

Although minimum required levels of equity are largely based on premium volume, product mix, and the quality of assets held, minimum requirements vary significantly at the state level. Our state regulated insurances subsidiaries had aggregate statutory capital and surplus of approximately$6.6 billion and $6.0 billion as of December 31, 2015 and 2014, respectively, which exceeded aggregate minimum regulatory requirements of$4.6 billion and $4.1 billion, respectively. Subsidiary dividends are subject to state regulatory approval, the amount and timing of which could be reduced or delayed. Excluding Puerto Rico subsidiaries, the amount of ordinary dividends that may be paid to our parent company in2016is approximately$900 millionin the aggregate. This compares to dividends that were paid to our parent company in2015of approximately$493 million. Actual dividends paid may vary due to consideration of excess statutory capital and surplus and expected future surplus requirements related to, for example, premium volume and product mix.

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COMMITMENTS, GUARANTEES AND CONTINGENCIES

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS, GUARANTEES AND CONTINGENCIES

COMMITMENTS, GUARANTEES AND CONTINGENCIES

Leases

We lease facilities, computer hardware, and other furniture and equipment under long-term operating leases that are noncancelable and expire on various dates through 2026. We sublease facilities or partial facilities to third party tenants for space not used in our operations. Rent with scheduled escalation terms are accounted for on a straight-line basis over the lease term. Rent expense and sublease rental income, which are recorded net as an operating cost, for all operating leases were as follows for the years ended December 31, 2015, 2014 and 2013:

	2015			2014			2013
	(in millions)
Rent expense	$	201		$	226		$	227
Sublease rental income	(25		)	(14		)	(11		)
Net rent expense	$	176		$	212		$	216

Future annual minimum payments due subsequent to December 31, 2015 under all of our noncancelable operating leases with initial terms in excess of one year are as follows:

	Minimum Lease Payments		Sublease Rental Receipts			Net  Lease Commitments
	(in millions)
For the years ending December 31,:
2016	$	173	$	(16	)	$	157
2017	159		(16		)	143
2018	127		(14		)	113
2019	94		(11		)	83
2020	54		(7		)	47
Thereafter	90		(45		)	45
Total	$	697	$	(109	)	$	588

Purchase Obligations

We have agreements to purchase services, primarily information technology related services, or to make improvements to real estate, in each case that are enforceable and legally binding on us and that specify all significant terms, including: fixed or minimum levels of service to be purchased; fixed, minimum or variable price provisions; and the appropriate timing of the transaction. We have purchase obligation commitments of $74 million in 2016, $44 million in 2017, $30 million in 2018, $1 million in 2019, and $1 million thereafter. Purchase obligations exclude agreements that are cancelable without penalty.

Off-Balance Sheet Arrangements

As part of our ongoing business, we do not participate or knowingly seek to participate in transactions that generate relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities, or SPEs, which would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. As of December 31, 2015, we were not involved in any SPE transactions.

Guarantees and Indemnifications

Through indemnity agreements approved by the state regulatory authorities, certain of our regulated subsidiaries generally are guaranteed by Humana Inc., our parent company, in the event of insolvency for (1) member coverage for which premium payment has been made prior to insolvency; (2) benefits for members then hospitalized until discharged; and (3) payment to providers for services rendered prior to insolvency. Our parent also has guaranteed the obligations of our military services subsidiaries.

In the ordinary course of business, we enter into contractual arrangements under which we may agree to indemnify a third party to such arrangement from any losses incurred relating to the services they perform on behalf of us, or for losses arising from certain events as defined within the particular contract, which may include, for example, litigation or claims relating to past performance. Such indemnification obligations may not be subject to maximum loss clauses. Historically, payments made related to these indemnifications have been immaterial.

Government Contracts

Our Medicare products, which accounted for approximately 72% of our total premiums and services revenue for the year ended December 31, 2015, primarily consisted of products covered under the Medicare Advantage and Medicare Part D Prescription Drug Plan contracts with the federal government. These contracts are renewed generally for a calendar year term unless CMS notifies us of its decision not to renew by May 1 of the calendar year in which the contract would end, or we notify CMS of our decision not to renew by the first Monday in June of the calendar year in which the contract would end. All material contracts between Humana and CMS relating to our Medicare products have been renewed for 2016, and all of our product offerings filed with CMS for 2016 have been approved.

CMS uses a risk-adjustment model which apportions premiums paid to Medicare Advantage, or MA, plans according to health severity of covered members. The risk-adjustment model pays more for enrollees with predictably higher costs. Under this model, rates paid to MA plans are based on actuarially determined bids, which include a process whereby our prospective payments are based on a comparison of our beneficiaries’ risk scores, derived from medical diagnoses, to those enrolled in the government’s traditional fee-for-service Medicare program (referred to as "Medicare FFS"). Under the risk-adjustment methodology, all MA plans must collect and submit the necessary diagnosis code information from hospital inpatient, hospital outpatient, and physician providers to CMS within prescribed deadlines. The CMS risk-adjustment model uses the diagnosis data to calculate the risk-adjusted premium payment to MA plans, which CMS adjusts for coding pattern differences between the health plans and the government fee-for-service program. We generally rely on providers, including certain providers in our network who are our employees, to code their claim submissions with appropriate diagnoses, which we send to CMS as the basis for our payment received from CMS under the actuarial risk-adjustment model. We also rely on these providers to document appropriately all medical data, including the diagnosis data submitted with claims. In addition, we conduct medical record reviews as part of our data and payment accuracy compliance efforts, to more accurately reflect diagnosis conditions under the risk adjustment model. These compliance efforts include the internal contract level audits described in more detail below.

CMS is continuing to perform audits of various companies’ selected MA contracts related to this risk adjustment diagnosis data. We refer to these audits as Risk-Adjustment Data Validation Audits, or RADV audits. RADV audits review medical records in an attempt to validate provider medical record documentation and coding practices which influence the calculation of premium payments to MA plans.

In 2012, CMS released a “Notice of Final Payment Error Calculation Methodology for Part C Medicare Advantage Risk Adjustment Data Validation (RADV) Contract-Level Audits.” The payment error calculation methodology provides that, in calculating the economic impact of audit results for an MA contract, if any, the results of the audit sample will be extrapolated to the entire MA contract based upon a comparison to “benchmark” audit data in Medicare FFS (which we refer to as the "FFS Adjuster"). This comparison to the FFS Adjuster is necessary to determine the economic impact, if any, of audit results because the government program data set, including any attendant errors that are present in that data set, provides the basis for MA plans’ risk adjustment to payment rates. CMS already makes other adjustments to payment rates based on a comparison of coding pattern differences between MA plans and Medicare FFS data (such as for frequency of coding for certain diagnoses in MA plan data versus the government program data set).

The final methodology, including the first application of extrapolated audit results to determine audit settlements, is expected to be applied to RADV contract level audits currently being conducted for contract year 2011 in which two of our Medicare Advantage plans are being audited. Per CMS guidance, selected MA contracts will be notified of an audit at some point after the close of the final reconciliation for the payment year being audited. The final reconciliation occurs in August of the calendar year following the payment year. We were notified on September 15, 2015, that five of our Medicare Advantage contracts have been selected for audit for contract year 2012.

Estimated audit settlements are recorded as a reduction of premiums revenue in our consolidated statements of income, based upon available information. We perform internal contract level audits based on the RADV audit methodology prescribed by CMS. Included in these internal contract level audits is an audit of our Private Fee-For-Service business which we used to represent a proxy of the FFS Adjuster which has not yet been released. We based our accrual of estimated audit settlements for each contract year on the results of these internal contract level audits and update our estimates as each audit is completed. Estimates derived from these results were not material to our results of operations, financial position, or cash flows. However, as indicated, we are awaiting additional guidance from CMS regarding the FFS Adjuster. Accordingly, we cannot determine whether such RADV audits will have a material adverse effect on our results of operations, financial position, or cash flows.

In addition, CMS' comments in formalized guidance regarding “overpayments” to MA plans appear to be inconsistent with CMS' prior RADV audit guidance. These statements, contained in the preamble to CMS’ final rule release regarding Medicare Advantage and Part D prescription drug benefit program regulations for Contract Year 2015, appear to equate each Medicare Advantage risk adjustment data error with an “overpayment” without reconciliation to the principles underlying the FFS Adjuster referenced above. We will continue to work with CMS to ensure that MA plans are paid accurately and that payment model principles are in accordance with the requirements of the Social Security Act, which, if not implemented correctly could have a material adverse effect on our results of operations, financial position, or cash flows.

At December 31, 2015, our military services business, which accounted for approximately 1% of our total premiums and services revenue for the year ended December 31, 2015, primarily consisted of the TRICARE South Region contract. The current 5-year South Region contract, which expires March 31, 2017, is subject to annual renewals on April 1 of each year during its term at the government’s option. On January 22, 2016, we received notice from the Defense Health Agency, or DHA, of its intent to exercise its option to extend the TRICARE South Region contract through March 31, 2017. On April 24, 2015, a request for proposal was issued for the next generation of TRICARE contracts for the period beginning April 1, 2017. The request for proposal provides for the consolidation of three regions into two - East and West. The current North Region and South Region are to be combined to form the East Region. We responded to the request for proposal on July 22, 2015. On January 15, 2016, we received a request for Final Proposal Revisions that we responded to on February 16, 2016.

Our state-based Medicaid business accounted for approximately 4% of our total premiums and services revenue for the year ended December 31, 2015. In addition to our state-based Temporary Assistance for Needy Families, or TANF, Medicaid contracts in Florida and Kentucky, we have contracts in Illinois and Virginia for stand-alone dual eligible demonstration programs serving individuals dually eligible for both the federal Medicare program and the applicable state-based Medicaid program as well as an Integrated Care Program, or ICP, Medicaid contract in Illinois. We began serving members in Illinois in the first quarter of 2014 and in Virginia in the second quarter of 2014. In addition, we began serving members in Long-Term Support Services (LTSS) regions in Florida at various effective dates ranging from the second half of 2013 through the first quarter of 2014.

The loss of any of the contracts above or significant changes in these programs as a result of legislative or regulatory action, including reductions in premium payments to us, regulatory restrictions on profitability, including by comparison of our Medicare Advantage profitability to our non-Medicare Advantage business profitability and a requirement that they remain within certain ranges of each other, or increases in member benefits without corresponding increases in premium payments to us, may have a material adverse effect on our results of operations, financial position, and cash flows.

Legal Proceedings and Certain Regulatory Matters

Florida Matters

On January 6, 2012, the Civil Division of the United States Attorney’s Office for the Southern District of Florida advised us that it is seeking documents and information from us and several of our affiliates relating to several matters including the coding of medical claims by one or more South Florida medical providers, and loans to physician practices. On May 1, 2014, the U.S. Attorney's Office filed a Notice of Non-Intervention in connection with a civil qui tam suit related to one of these matters captioned United States of America ex rel. Olivia Graves v. Plaza Medical Centers, et al., and the Court ordered the complaint unsealed. Subsequently, the individual plaintiff amended the complaint and served the Company, opting to continue to pursue the action. The individual plaintiff has filed a third amended complaint which we answered on October 16, 2015. The Court has ordered trial to commence on October 3, 2016 if the matter is not resolved prior to trial. We continue to cooperate with and respond to information requests from the U.S. Attorney’s office. These matters could result in additional qui tam litigation.

As previously disclosed, the Civil Division of the United States Department of Justice had provided us with an information request, separate from but related to the Plaza Medical matter, concerning our Medicare Part C risk adjustment practices. The request relates to our oversight and submission of risk adjustment data generated by providers in our Medicare Advantage network, including the providers identified in the Plaza Medical matter, as well as to our business and compliance practices related to risk adjustment data generated by our providers and by us, including medical record reviews conducted as part of our data and payment accuracy compliance efforts, the use of health and well-being assessments, and our fraud detection efforts. We believe that this request for information is in connection with a wider review of Medicare Risk Adjustment generally that includes a number of Medicare Advantage plans, providers and vendors. We continue to cooperate with and voluntarily respond to the information requests from the Department of Justice and the U.S. Attorney’s Office. These matters are expected to result in additional qui tam litigation.

On June 16, 2015, the U.S. Attorney’s Office filed a Declination Notice, indicating its intent not to intervene, in connection with a civil qui tam suit captioned U.S. ex rel. Ramsey-Ledesma v. Censeo, et al., and the Court ordered the complaint unsealed. Subsequently, the individual plaintiff filed a second amended complaint and served the Company, opting to continue to pursue the action. The plaintiff’s second amended complaint names several other defendants, including CenseoHealth. On January 8, 2016, we and the other defendants each filed a motion to dismiss the second amended complaint.

Litigation Related to the Merger

In connection with the Merger, three putative class action complaints were filed by purported Humana stockholders challenging the Merger, two in the Circuit Court of Jefferson County, Kentucky and one in the Court of Chancery of the State of Delaware. The complaints are captioned Solak v. Broussard et al., Civ. Act. No. 15CI03374 (Kentucky state court), Litwin v. Broussard et al., Civ. Act. No. 15CI04054 (Kentucky state court) and Scott v. Humana Inc. et al., C.A. No. 11323-VCL (Delaware state court). The complaints name as defendants each member of Humana’s board of directors, Aetna, and, in the case of the Delaware complaint, Humana. The complaints generally allege, among other things, that the individual members of our board of directors breached their fiduciary duties owed to our stockholders by entering into the Merger Agreement, approving the mergers as contemplated by the Merger Agreement, and failing to take steps to maximize the value of Humana to our stockholders, and that Aetna, and, in the case of the Delaware complaint, Humana aided and abetted such breaches of fiduciary duties. In addition, the complaints allege that the merger undervalues Humana, that the process leading up to the execution of the Merger Agreement was flawed, that the members of our board of directors improperly placed their own financial interests ahead of those of our stockholders, and that certain provisions of the Merger Agreement improperly favor Aetna and impede a potential alternative transaction. Among other remedies, the complaints seek equitable relief rescinding the Merger Agreement and enjoining the defendants from completing the mergers as well as costs and attorneys’ fees. We refer to all these cases collectively in this report as the Merger Litigation. On August 20, 2015, the parties in the Kentucky state cases filed a stipulation and proposed order with the court to consolidate these cases into a single action captioned In re Humana Inc. Shareholder Litigation, Civ. Act. No. 15CI03374.

On October 9, 2015, solely to avoid the costs, risks, and uncertainties inherent in litigation, and without admitting any liability or wrongdoing, we and the other named defendants in the Merger Litigation signed a memorandum of understanding, which we refer to as the MOU, to settle the Merger Litigation. Subject to court approval and further definitive documentation in a stipulation of settlement that will be subject to customary conditions, the MOU resolved the claims brought in the Merger Litigation and provided that we would make certain additional disclosures related to the proposed mergers. The MOU further provided for, among other things, dismissal of the Merger Litigation with prejudice and a release and settlement by the purported class of our stockholders of all claims against the defendants and their affiliates and agents in connection with the Merger Agreement and transactions and disclosures related to the Merger Agreement. The asserted claims will not be released until such stipulation of settlement receives court approval. The foregoing terms and conditions will be defined by the stipulation of settlement, and class members will receive a separate notice describing the settlement terms and their rights in connection with the approval of the settlement. In connection with the settlement, the parties contemplate that plaintiffs’ counsel will file a petition for an award of attorneys’ fees and expenses. We will pay or cause to be paid any court awarded attorneys’ fees and expenses. There can be no assurance that the parties will ultimately enter into a stipulation of settlement or that a court will approve such settlement even if the parties were to enter into such stipulation. In such event, the proposed settlement as contemplated by the MOU may be terminated. Because the MOU contemplates that the Kentucky court will be asked to approve the settlement, the plaintiffs have already withdrawn the Delaware case.

Other Lawsuits and Regulatory Matters

Our current and past business practices are subject to review or other investigations by various state insurance and health care regulatory authorities and other state and federal regulatory authorities. These authorities regularly scrutinize the business practices of health insurance, health care delivery and benefits companies. These reviews focus on numerous facets of our business, including claims payment practices, statutory capital requirements, provider contracting, risk adjustment, competitive practices, commission payments, privacy issues, utilization management practices, pharmacy benefits, access to care, and sales practices, among others. Some of these reviews have historically resulted in fines imposed on us and some have required changes to some of our practices. We continue to be subject to these reviews, which could result in additional fines or other sanctions being imposed on us or additional changes in some of our practices.

We also are involved in various other lawsuits that arise, for the most part, in the ordinary course of our business operations, certain of which may be styled as class-action lawsuits. Among other matters, this litigation may include employment matters, claims of medical malpractice, bad faith, nonacceptance or termination of providers, anticompetitive practices, improper rate setting, provider contract rate disputes, failure to disclose network discounts and various other provider arrangements, general contractual matters, intellectual property matters, and challenges to subrogation practices. For example, a number of hospitals and other providers have asserted that, under their network provider contracts, we are not entitled to reduce Medicare Advantage payments to these providers in connection with changes in Medicare payment systems and in accordance with the Balanced Budget and Emergency Deficit Control Act of 1985, as amended (commonly referred to as “sequestration”). Those challenges have led and could lead to arbitration demands or other litigation. Also, under state guaranty assessment laws, including those related to state cooperative failures in the industry, we may be assessed (up to prescribed limits) for certain obligations to the policyholders and claimants of insolvent insurance companies that write the same line or lines of business as we do.

As a government contractor, we may also be subject to qui tam litigation brought by individuals who seek to sue on behalf of the government, alleging that the government contractor submitted false claims to the government including, among other allegations, those resulting from coding and review practices under the Medicare risk adjustment model. Qui tam litigation is filed under seal to allow the government an opportunity to investigate and to decide if it wishes to intervene and assume control of the litigation. If the government does not intervene, the lawsuit is unsealed, and the individual may continue to prosecute the action on his or her own, on behalf of the government. We also are subject to other allegations of non-performance of contractual obligations to providers, members, and others, including failure to properly pay claims, improper policy terminations, challenges to our implementation of the Medicare Part D prescription drug program and other litigation.

A limited number of the claims asserted against us are subject to insurance coverage. Personal injury claims, claims for extracontractual damages, care delivery malpractice, and claims arising from medical benefit denials are covered by insurance from our wholly owned captive insurance subsidiary and excess carriers, except to the extent that claimants seek punitive damages, which may not be covered by insurance in certain states in which insurance coverage for punitive damages is not permitted. In addition, insurance coverage for all or certain forms of liability has become increasingly costly and may become unavailable or prohibitively expensive in the future.

We record accruals for the contingencies discussed in the sections above to the extent that we conclude it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. No estimate of the possible loss or range of loss in excess of amounts accrued, if any, can be made at this time regarding the matters specifically described above because of the inherently unpredictable nature of legal proceedings, which also may be exacerbated by various factors, including: (i) the damages sought in the proceedings are unsubstantiated or indeterminate; (ii) discovery is not complete; (iii) the proceeding is in its early stages; (iv) the matters present legal uncertainties; (v) there are significant facts in dispute; (vi) there are a large number of parties (including where it is uncertain how liability, if any, will be shared among multiple defendants); or (vii) there is a wide range of potential outcomes.

The outcome of any current or future litigation or governmental or internal investigations, including the matters described above, cannot be accurately predicted, nor can we predict any resulting judgments, penalties, fines or other sanctions that may be imposed at the discretion of federal or state regulatory authorities or as a result of actions by third parties. Nevertheless, it is reasonably possible that any such outcome of litigation, judgments, penalties, fines or other sanctions could be substantial, and the outcome of these matters may have a material adverse effect on our results of operations, financial position, and cash flows, and may also affect our reputation.

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SEGMENT INFORMATION

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

On January 1, 2015, we realigned certain of our businesses among our reportable segments to correspond with internal management reporting changes and renamed our Employer Group segment to the Group segment. Our three reportable segments remain Retail, Group, and Healthcare Services. The more significant realignments included reclassifying Medicare benefits offered to groups to the Retail segment from the Group segment, bringing all of our Medicare offerings, which are now managed collectively, together in one segment, recognizing that in some instances we market directly to individuals that are part of a group Medicare account. In addition, we realigned our military services business, primarily consisting of our TRICARE South Region contract previously included in the Other Businesses category, to our Group segment as we consider this contract with the government to be a group account. Prior period segment financial information has been recast to conform to the 2015 presentation.

We manage our business with three reportable segments: Retail, Group, and Healthcare Services. In addition, the Other Businesses category includes businesses that are not individually reportable because they do not meet the quantitative thresholds required by generally accepted accounting principles. These segments are based on a combination of the type of health plan customer and adjacent businesses centered on well-being solutions for our health plans and other customers, as described below. These segment groupings are consistent with information used by our Chief Executive Officer to assess performance and allocate resources.

The Retail segment consists of Medicare benefits, marketed to individuals or directly via group accounts, as well as individual commercial fully-insured medical and specialty health insurance benefits, including dental, vision, and other supplemental health and financial protection products. In addition, the Retail segment also includes our contract with CMS to administer the LI-NET prescription drug plan program and contracts with various states to provide Medicaid, dual eligible, and Long-Term Support Services benefits, collectively our state-based contracts. The Group segment consists of employer group commercial fully-insured medical and specialty health insurance benefits, including dental, vision, and other supplemental health and voluntary insurance benefits, as well as administrative services only, or ASO products. In addition, our Group segment includes our health and wellness products (primarily marketed to employer groups) and military services business, primarily our TRICARE South Region contract. The Healthcare Services segment includes services offered to our health plan members as well as to third parties, including pharmacy solutions, provider services, home based services, and clinical programs, as well as services and capabilities to advance population health. We will continue to report under the category of Other Businesses those businesses which do not align with the reportable segments described above, primarily our closed-block long-term care insurance policies.

Our Healthcare Services intersegment revenues primarily relate to managing prescription drug coverage for members of our other segments through Humana Pharmacy Solutions^®, or HPS, and includes the operations of Humana Pharmacy, Inc., our mail order pharmacy business. These revenues consist of the prescription price (ingredient cost plus dispensing fee), including the portion to be settled with the member (co-share) or with the government (subsidies), plus any associated administrative fees. Services revenues related to the distribution of prescriptions by third party retail pharmacies in our networks are recognized when the claim is processed and product revenues from dispensing prescriptions from our mail order pharmacies are recorded when the prescription or product is shipped. Our pharmacy operations, which are responsible for designing pharmacy benefits, including defining member co-share responsibilities, determining formulary listings, contracting with retail pharmacies, confirming member eligibility, reviewing drug utilization, and processing claims, act as a principal in the arrangement on behalf of members in our other segments. As principal, our Healthcare Services segment reports revenues on a gross basis including co-share amounts from members collected by third party retail pharmacies at the point of service.

In addition, our Healthcare Services intersegment revenues include revenues earned by certain owned providers derived from risk-based and non risk-based managed care agreements with our health plans. Under risk based agreements, the provider receives a monthly capitated fee that varies depending on the demographics and health status of the member, for each member assigned to these owned providers by our health plans. The owned provider assumes the economic risk of funding the assigned members’ healthcare services. Under non risk-based agreements, our health plans retain the economic risk of funding the assigned members' healthcare services. Our Healthcare Services segment reports provider services revenues associated with risk-based agreements on a gross basis, whereby capitation fee revenue is recognized in the period in which the assigned members are entitled to receive healthcare services. Provider services revenues associated with non risk-based agreements are presented net of associated healthcare costs.

We present our consolidated results of operations from the perspective of the health plans. As a result, the cost of providing benefits to our members, whether provided via a third party provider or internally through a stand-alone subsidiary, is classified as benefits expense and excludes the portion of the cost for which the health plans do not bear responsibility, including member co-share amounts and government subsidies of $12.3 billion in 2015, $9.7 billion in 2014, and $7.3 billion in 2013. In addition, depreciation and amortization expense associated with certain businesses in our Healthcare Services segment delivering benefits to our members, primarily associated with our provider services and pharmacy operations, are included with benefits expense. The amount of this expense was $92 million in 2015, $116 million in 2014, and $93 million in 2013.

Other than those described previously, the accounting policies of each segment are the same and are described in Note 2. Transactions between reportable segments primarily consist of sales of services rendered by our Healthcare Services segment, primarily pharmacy, provider, and home based services as well as clinical programs, to our Retail and Group customers. Intersegment sales and expenses are recorded at fair value and eliminated in consolidation. Members served by our segments often use the same provider networks, enabling us in some instances to obtain more favorable contract terms with providers. Our segments also share indirect costs and assets. As a result, the profitability of each segment is interdependent. We allocate most operating expenses to our segments. Assets and certain corporate income and expenses are not allocated to the segments, including the portion of investment income not supporting segment operations, interest expense on corporate debt, and certain other corporate expenses. These items are managed at a corporate level. These corporate amounts are reported separately from our reportable segments and are included with intersegment eliminations in the tables presenting segment results below.

Our segment results were as follows for the years ended December 31, 2015, 2014, and 2013:

	Retail		Group		Healthcare Services		Other Businesses		Eliminations/ Corporate			Consolidated
	(in millions)
2015
Revenues—external customers
Premiums:
Individual Medicare Advantage	$	29,526	$	—	$	—	$	—	$	—		$	29,526
Group Medicare Advantage	5,588		—		—		—		—			5,588
Medicare stand-alone PDP	3,846		—		—		—		—			3,846
Total Medicare	38,960		—		—		—		—			38,960
Fully-insured	4,243		5,493		—		—		—			9,736
Specialty	261		1,055		—		—		—			1,316
Medicaid and other	2,341		21		—		35		—			2,397
Total premiums	45,805		6,569		—		35		—			52,409
Services revenue:
Provider	—		40		655		—		—			695
ASO and other	9		658		—		14		—			681
Pharmacy	—		—		30		—		—			30
Total services revenue	9		698		685		14		—			1,406
Total revenues—external customers	45,814		7,267		685		49		—			53,815
Intersegment revenues
Services	—		93		17,997		—		(18,090		)	—
Products	—		—		4,923		—		(4,923		)	—
Total intersegment revenues	—		93		22,920		—		(23,013		)	—
Investment income	134		26		—		76		238			474
Total revenues	45,948		7,386		23,605		125		(22,775		)	54,289
Operating expenses:
Benefits	39,708		5,266		—		87		(792		)	44,269
Operating costs	5,118		1,769		22,481		14		(22,064		)	7,318
Depreciation and amortization	192		93		143		—		(73		)	355
Total operating expenses	45,018		7,128		22,624		101		(22,929		)	51,942
Income from operations	930		258		981		24		154			2,347
Gain on sale of business	—		—		—		—		270			270
Interest expense	—		—		—		—		186			186
Income before income taxes	$	930	$	258	$	981	$	24	$	238		$	2,431

Premium and services revenues derived from our contracts with the federal government, as a percentage of our total premium and services revenues, was approximately 73% for 2015, compared to 73% for 2014, and 75% for 2013.

Benefits expense for the Retail segment for 2015 includes $176 million for a provision for probable future losses (premium deficiency) for individual commercial medical business compliant with the Health Care Reform Law for the 2016 coverage year as discussed more fully in Note 7.

	Retail		Group		Healthcare Services		Other Businesses		Eliminations/ Corporate			Consolidated
	(in millions)
2014
Revenues—external customers
Premiums:
Individual Medicare Advantage	$	25,782	$	—	$	—	$	—	$	—		$	25,782
Group Medicare Advantage	5,490		—		—		—		—			5,490
Medicare stand-alone PDP	3,404		—		—		—		—			3,404
Total Medicare	34,676		—		—		—		—			34,676
Fully-insured	3,265		5,339		—		—		—			8,604
Specialty	256		1,098		—		—		—			1,354
Medicaid and other	1,255		19		—		51		—			1,325
Total premiums	39,452		6,456		—		51		—			45,959
Services revenue:
Provider	—		23		1,254		—		—			1,277
ASO and other	39		740		—		9		—			788
Pharmacy	—		—		99		—		—			99
Total services revenue	39		763		1,353		9		—			2,164
Total revenues—external customers	39,491		7,219		1,353		60		—			48,123
Intersegment revenues
Services	—		78		15,098		—		(15,176		)	—
Products	—		—		3,749		—		(3,749		)	—
Total intersegment revenues	—		78		18,847		—		(18,925		)	—
Investment income	97		23		—		60		197			377
Total revenues	39,588		7,320		20,200		120		(18,728		)	48,500
Operating expenses:
Benefits	33,508		5,130		—		102		(574		)	38,166
Operating costs	4,576		1,936		19,307		17		(18,197		)	7,639
Depreciation and amortization	165		103		155		—		(90		)	333
Total operating expenses	38,249		7,169		19,462		119		(18,861		)	46,138
Income from operations	1,339		151		738		1		133			2,362
Interest expense	—		—		—		—		192			192
Income (loss) before income taxes	$	1,339	$	151	$	738	$	1	$	(59	)	$	2,170

	Retail		Group		Healthcare Services		Other Businesses			Eliminations/ Corporate			Consolidated
	(in millions)
2013
Revenues—external customers
Premiums:
Individual Medicare Advantage	$	22,481	$	—	$	—	$	—		$	—		$	22,481
Group Medicare Advantage	4,710		—		—		—			—			4,710
Medicare stand-alone PDP	3,033		—		—		—			—			3,033
Total Medicare	30,224		—		—		—			—			30,224
Fully-insured	1,160		5,117		—		—			—			6,277
Specialty	210		1,095		—		—			—			1,305
Medicaid and other	328		25		—		670			—			1,023
Total premiums	31,922		6,237		—		670			—			38,829
Services revenue:
Provider	—		21		1,291		—			—			1,312
ASO and other	18		714		—		6			—			738
Pharmacy	—		—		59		—			—			59
Total services revenue	18		735		1,350		6			—			2,109
Total revenues—external customers	31,940		6,972		1,350		676			—			40,938
Intersegment revenues
Services	—		51		11,890		—			(11,941		)	—
Products	—		—		2,803		—			(2,803		)	—
Total intersegment revenues	—		51		14,693		—			(14,744		)	—
Investment income	92		24		—		59			200			375
Total revenues	32,032		7,047		16,043		735			(14,544		)	41,313
Operating expenses:
Benefits	27,164		4,847		—		962			(409		)	32,564
Operating costs	3,232		1,860		15,372		56			(14,165		)	6,355
Depreciation and amortization	146		100		151		6			(70		)	333
Total operating expenses	30,542		6,807		15,523		1,024			(14,644		)	39,252
Income (loss) from operations	1,490		240		520		(289		)	100			2,061
Interest expense	—		—		—		—			140			140
Income (loss) before income taxes	$	1,490	$	240	$	520	$	(289	)	$	(40	)	$	1,921

Benefits expense for Other Businesses for 2013 includes $243 million for reserve strengthening associated with our closed block of long-term care insurance policies as discussed more fully in Note 18.

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EXPENSES ASSOCIATED WITH LONG-DURATION INSURANCE PRODUCTS

12 Months Ended

Dec. 31, 2015

Insurance [Abstract]

EXPENSES ASSOCIATED WITH LONG-DURATION INSURANCE PRODUCTS

EXPENSES ASSOCIATED WITH LONG-DURATION INSURANCE PRODUCTS

Premiums associated with our long-duration insurance products accounted for approximately 1% of our consolidated premiums and services revenue for the year ended December 31, 2015. We use long-duration accounting for products such as long-term care, life insurance, annuities, and certain health and other supplemental policies sold to individuals because they are expected to remain in force for an extended period beyond one year and because premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. As a result, we defer policy acquisition costs, primarily consisting of commissions, and amortize them over the estimated life of the policies in proportion to premiums earned.

In addition, we establish reserves for future policy benefits in recognition of the fact that some of the premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. At policy issuance, these reserves are recognized on a net level premium method based on premium rate increase, interest rate, mortality, morbidity, persistency (the percentage of policies remaining in-force), and maintenance expense assumptions. The assumptions used to determine the liability for future policy benefits are established and locked in at the time each contract is issued and only change if our expected future experience deteriorates to the point that the level of the liability, together with the present value of future gross premiums, are not adequate to provide for future expected policy benefits and maintenance costs (i.e. the loss recognition date). As discussed in Note 2, beginning in 2014, health policies sold to individuals that conform to the Health Care Reform Law are accounted for under a short-duration model because premiums received in the current year are intended to pay anticipated benefits in that year.

The table below presents deferred acquisition costs and future policy benefits payable associated with our long-duration insurance products for the years ended December 31, 2015 and 2014.

	2015					2014
	Deferred acquisition costs		Future policy benefits payable			Deferred acquisition costs		Future policy benefits payable
	(in millions)
Other long-term assets	$	135	$	—		$	167	$	—
Trade accounts payable and accrued expenses	—		(64		)	—		(68		)
Long-term liabilities	—		(2,151		)	—		(2,349		)
Total asset (liability)	$	135	$	(2,215	)	$	167	$	(2,417	)

In addition, future policy benefits payable include amounts of $205 million at December 31, 2015 and $210 million at December 31, 2014 which are subject to 100% coinsurance agreements as more fully described in Note 19.

In 2015, we recorded a net reduction in benefits expense of $80 million associated with future policy benefits primarily due to the release of reserves as individual commercial medical members transitioned to plans compliant with the Health Care Reform Law. Benefits expense associated with future policy benefits payable was $32 million in 2014 and $354 million in 2013. Benefits expense for 2013 included net charges of $243 million associated with our closed block of long-term care insurance policies discussed further below. Amortization of deferred acquisition costs included in operating costs was $63 million in 2015, $39 million in 2014, and $55 million in 2013. The increase in amortization in 2015 primarily reflects the effect of existing previously underwritten members transitioning to policies compliant with the Health Care Reform Law with us and other carriers.

Future policy benefits payable include $1.5 billion at December 31, 2015 and2014associated with a non-strategic closed block of long-term care insurance policies acquired in connection with the 2007 acquisition of KMG.Future policy benefits payable includes amounts charged to accumulated other comprehensive income for an additional liability that would exist on our closed-block of long-term care insurance policies if unrealized gains on the sale of the investments backing such products had been realized and the proceeds reinvested at then current yields. There was no additional liability at December 31, 2015 and $123 million of additional liability at December 31,2014. Amounts charged to accumulated other comprehensive income are net of applicable deferred taxes.

Long-term care insurance policies provide nursing home and home health coverage for which premiums are collected many years in advance of benefits paid, if any. Therefore, our actual claims experience will emerge many years after assumptions have been established. The risk of a deviation of the actual premium rate increase, interest, morbidity, mortality, persistency, and maintenance expense assumptions from those assumed in our reserves are particularly significant to our closed block of long-term care insurance policies. We monitor the loss experience of these long-term care insurance policies and, when necessary, apply for premium rate increases through a regulatory filing and approval process in the jurisdictions in which such products were sold. To the extent premium rate increases, interest rates, and/or loss experience vary from our loss recognition date assumptions, material future adjustments to reserves could be required.

During 2013, we recorded a loss for a premium deficiency. The premium deficiency was based on current and anticipated experience that had deteriorated from our locked-in assumptions from the previous December 31, 2010 loss recognition date, particularly as they related to emerging experience due to an increase in life expectancies and utilization of home health care services. Based on this deterioration, and combined with lower interest rates, we determined that our existing future policy benefits payable, together with the present value of future gross premiums, associated with our closed block of long-term care insurance policies were not adequate to provide for future policy benefits and maintenance costs under these policies; therefore we unlocked and modified our assumptions based on current expectations. Accordingly, during 2013 we recorded $243 million of additional benefits expense, with a corresponding increase in future policy benefits payable of $350 million partially offset by a related reinsurance recoverable of $107 million included in other long-term assets.

Deferred acquisition costs included $26 million and $59 million associated with our individual commercial medical policies at December 31, 2015 and December 31, 2014, respectively. Future policy benefits payable associated with our individual commercial medical policies were $180 million at December 31, 2015 and $297 million at December 31, 2014. The decline in deferred acquisition costs and future policy benefits payable primarily reflects the effect of existing previously underwritten members transitioning to policies compliant with the Health Care Reform Law with us and other carriers.

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REINSURANCE

12 Months Ended

Dec. 31, 2015

Insurance [Abstract]

REINSURANCE

REINSURANCE

Certain blocks of insurance assumed in acquisitions, primarily life, long-term care, and annuities in run-off status, are subject to reinsurance where some or all of the underwriting risk related to these policies has been ceded to a third party. In addition, a large portion of our reinsurance takes the form of 100% coinsurance agreements where, in addition to all of the underwriting risk, all administrative responsibilities, including premium collections and claim payment, have also been ceded to a third party. We acquired these policies and related reinsurance agreements with the purchase of stock of companies in which the policies were originally written. We acquired these companies for business reasons unrelated to these particular policies, including the companies’ other products and licenses necessary to fulfill strategic plans.

A reinsurance agreement between two entities transfers the underwriting risk of policyholder liabilities to a reinsurer while the primary insurer retains the contractual relationship with the ultimate insured. As such, these reinsurance agreements do not completely relieve us of our potential liability to the ultimate insured. However, given the transfer of underwriting risk, our potential liability is limited to the credit exposure which exists should the reinsurer be unable to meet its obligations assumed under these reinsurance agreements.

Reinsurance recoverables represent the portion of future policy benefits payable and benefits payable that are covered by reinsurance. Amounts recoverable from reinsurers are estimated in a manner consistent with the methods used to determine future policy benefits payable as detailed in Note 2. Excluding reinsurance associated with the Health Care Reform Law discussed in Note 2, reinsurance recoverables, included in other current and long-term assets, were $668 million at December 31, 2015 and $646 million at December 31, 2014. The percentage of these reinsurance recoverables resulting from 100% coinsurance agreements was approximately 43% at December 31, 2015 and approximately 45% at December 31, 2014. Premiums ceded were $821 million in 2015, $357 million in 2014 and $33 million in 2013. Benefits ceded were $666 million in 2015, $272 million in 2014, and $70 million in 2013. Ceded premium and benefits reflect a July 1, 2014 amendment ceding all risk under a Medicaid contract to a third party reinsurer.

We evaluate the financial condition of these reinsurers on a regular basis. These reinsurers are well-known and well-established, as evidenced by the strong financial ratings at December 31, 2015 presented below:

Reinsurer	Total Recoverable		A.M. Best Rating at December 31, 2015
	(in millions)
Protective Life Insurance Company	$	184	A+ (superior)
Munich American Reassurance Company	155		A+ (superior
Employers Reassurance Corporation	91		A- (excellent)
General Re Life Corporation	90		A++ (superior)
All others	148		A+ to B++ (superior to good)
	$	668

The all other category represents 18 reinsurers with individual balances less than $85 million. Three of these reinsurers with recoverables of $104 million are subject to trust or funds withheld accounts, requiring amounts at least equal to the total recoverable from each of these reinsurers.

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QUARTERLY FINANCIAL INFORMATION (Unaudited)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

QUARTERLY FINANCIAL INFORMATION (Unaudited)

QUARTERLY FINANCIAL INFORMATION

(Unaudited)

A summary of our quarterly unaudited results of operations for the years ended December 31, 2015 and 2014 follows:

	2015
	First		Second		Third		Fourth (2)
	(in millions, except per share results)
Total revenues	$	13,833	$	13,732	$	13,363	$	13,361
Income before income taxes	744		793		648		246
Net income	430		431		314		101
Basic earnings per common share	$	2.86	$	2.88	$	2.11	$	0.68
Diluted earnings per common share (1)	$	2.82	$	2.85	$	2.09	$	0.67
	2014
	First		Second		Third		Fourth
	(in millions, except per share results)
Total revenues	$	11,712	$	12,222	$	12,238	$	12,328
Income before income taxes	686		646		551		287
Net income	368		344		290		145
Basic earnings per common share	$	2.37	$	2.22	$	1.87	$	0.96
Diluted earnings per common share (1)	$	2.35	$	2.19	$	1.85	$	0.94

(1) The calculation of diluted earnings per common share is based on the weighted average shares outstanding during each quarter and, accordingly, the sum may not equal the total for the year.

(2) The fourth quarter of 2015 includes an expense of $176 million ($112 million after tax, or $0.74 per diluted common share) for a premium deficiency reserve associated with our individual commercial medical policies compliant with the Health Care Reform Law associated with the 2016 coverage year.

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SCHEDULE I-PARENT COMPANY FINANCIAL INFORMATION

12 Months Ended

Dec. 31, 2015

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

SCHEDULE I-PARENT COMPANY FINANCIAL INFORMATION

BASIS OF PRESENTATION

Parent company financial information has been derived from our consolidated financial statements and excludes the accounts of all operating subsidiaries. This information should be read in conjunction with our consolidated financial statements.

Related Party

Refer to Note 2 of the notes to consolidated financial statements in this Annual Report on Form 10-K for a description of our related party transactions. A related party note receivable in the amount of $284 million is included with other long-term assets in our condensed balance sheet at December 31, 2015 and with purchases of investment securities in our condensed statement of cash flows. The related interest income is included in investment income in our consolidated statement of income.

TRANSACTIONS WITH SUBSIDIARIES

Management Fee

Through intercompany service agreements approved, if required, by state regulatory authorities, Humana Inc., our parent company, charges a management fee for reimbursement of certain centralized services provided to its subsidiaries including information systems, disbursement, investment and cash administration, marketing, legal, finance, and medical and executive management oversight.

Dividends

Cash dividends received from subsidiaries and included as a component of net cash provided by operating activities were $493 million in 2015, $927 million in 2014, and $967 million in 2013. Subsidiary dividends in 2015 reflect the impact of losses for our individual commercial medical business compliant with the Health Care Reform Law and the November 5, 2015 revised statutory accounting guidance requiring the exclusion of risk corridor receivables from related statutory surplus discussed in Note 3 below.

Guarantee

Through indemnity agreements approved by state regulatory authorities, certain of our regulated subsidiaries generally are guaranteed by our parent company in the event of insolvency for: (1) member coverage for which premium payment has been made prior to insolvency; (2) benefits for members then hospitalized until discharged; and (3) payment to providers for services rendered prior to insolvency. Our parent has also guaranteed the obligations of our military services subsidiaries.

Notes Receivables from Operating Subsidiaries

We funded certain subsidiaries with surplus note agreements. These notes are generally non-interest bearing and may not be entered into or repaid without the prior approval of the applicable Departments of Insurance or other state regulatory authorities.

Notes Payable to Operating Subsidiaries

We borrowed funds from certain subsidiaries with notes generally collateralized by real estate. These notes, which have various payment and maturity terms, bear interest ranging from 1.51% to 6.65% and are payable in 2016 and 2019. We recorded interest expense of $1 million related to these notes for each of the years ended December 31, 2015, 2014 and 2013.

REGULATORY REQUIREMENTS

Certain of our insurance subsidiaries operate in states that regulate the payment of dividends, loans, or other cash transfers to Humana Inc., our parent company, and require minimum levels of equity as well as limit investments to approved securities. The amount of dividends that may be paid to Humana Inc. by these insurance subsidiaries, without prior approval by state regulatory authorities, or ordinary dividends, is limited based on the entity’s level of statutory income and statutory capital and surplus. In most states, prior notification is provided before paying a dividend even if approval is not required.

Although minimum required levels of equity are largely based on premium volume, product mix, and the quality of assets held, minimum requirements vary significantly at the state level. Our state regulated insurances subsidiaries had aggregate statutory capital and surplus of approximately$6.6 billion and $6.0 billion as of December 31, 2015 and 2014, respectively, which exceeded aggregate minimum regulatory requirements of$4.6 billion and $4.1 billion, respectively. Subsidiary dividends are subject to state regulatory approval, the amount and timing of which could be reduced or delayed. Excluding Puerto Rico subsidiaries, the amount of ordinary dividends that may be paid to our parent company in2016is approximately$900 millionin the aggregate. This compares to dividends that were paid to our parent company in2015of approximately$493 million. Actual dividends paid may vary due to consideration of excess statutory capital and surplus and expected future surplus requirements related to, for example, premium volume and product mix.

On November 5, 2015, the National Association of Insurance Commissioners, or NAIC, issued statutory accounting guidance for receivables associated with the risk corridor provisions under the Health Care Reform Law, which requires the receivables to be excluded from subsidiary surplus. This accounting guidance required additional capital contributions into certain subsidiaries during 2015.

Certain regulated subsidiaries recognized premium deficiency reserves for our individual commercial medical policies compliant with the Health Care Reform Law for the 2016 coverage year in the fourth quarter of 2015. Further, the statutory-based premium deficiency excludes the estimated benefit associated with the risk corridor provisions as a reduction in subsidiary surplus in accordance with the previously discussed November 5, 2015 statutory accounting guidance requiring the exclusion of risk corridor amounts from subsidiary surplus. As a result of the statutory-based premium deficiency, we will fund capital contributions into certain regulated subsidiaries of $450 million during the first quarter of 2016.

Our use of operating cash flows derived from our non-insurance subsidiaries, such as in our Healthcare Services segment, is generally not restricted by state departments of insurance (or comparable state regulators).

ACQUISITIONS AND DIVESTITURES

Refer to Note 3 of the notes to consolidated financial statements in this Annual Report on Form 10-K for a description of certain acquisitions and divestitures. On June 1, 2015, we completed the sale of our wholly owned subsidiary, Concentra Inc. During 2015, 2014 and 2013, we funded certain non-regulated subsidiary acquisitions, including the acquisition of American Eldercare Inc., with contributions from Humana Inc., our parent company, included in capital contributions in the condensed statement of cash flows.

INCOME TAXES

Refer to Note 11 of the notes to consolidated financial statements included in this Annual Report on Form 10-K for a description of income taxes.

DEBT

Refer to Note 12 of the notes to consolidated financial statements included in this Annual Report on Form 10-K for a description of debt.

STOCKHOLDER’S EQUITY

Refer to Note 15 of the notes to consolidated financial statements included in this Annual Report on Form 10-K for a description of stockholders’ equity, including stock repurchases and stockholder dividends.

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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2015

Valuation and Qualifying Accounts [Abstract]

SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS

SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS

For the Years Ended December 31, 2015, 2014, and 2013

(in millions)

							Additions
	Balance  at Beginning of Period			Acquired/(Disposed) Balances			Charged (Credited)  to Costs and Expenses			Charged  to Other Accounts (1)			Deductions or Write-offs			Balance at End  of Period
Allowance for loss on receivables:
2015	$	137		$	(39	)	$	61		$	(7	)	$	(51	)	$	101
2014	118			—			32			28			(41		)	137
2013	94			—			37			18			(31		)	118
Deferred tax asset valuation allowance:
2015	(48		)	—			6			—			—			(42		)
2014	(28		)	—			(20		)	—			—			(48		)
2013	(28		)	—			—			—			—			(28		)

(1) Represents changes in retroactive membership adjustments to premiums revenue and contractual allowances adjustments to services revenue as more fully described in Note 2 to the consolidated financial statements included in this annual report on Form 10-K.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

Our financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of America. Our consolidated financial statements include the accounts of Humana Inc. and subsidiaries that the Company controls, including variable interest entities associated with medical practices for which we are the primary beneficiary. We do not own many of our medical practices but instead enter into exclusive management agreements with the affiliated Professional Associations, or P.A.s, that operate these medical practices. Based upon the provisions of these agreements, these affiliated P.A.s are variable interest entities and we are the primary beneficiary, and accordingly we consolidated the affiliated P.A.s. All significant intercompany balances and transactions have been eliminated.

The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America requires us to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. The areas involving the most significant use of estimates are the estimation of benefits payable, future policy benefits payable, the impact of risk adjustment provisions related to our Medicare contracts, the valuation and related impairment recognition of investmentsecurities, and the valuation and related impairment recognition of long-lived assets, including goodwill. These estimates are based on knowledge of current events and anticipated future events, and accordingly, actual results may ultimately differ materially from those estimates.

Business Segment Reclassifications

Business Segment Reclassifications

On January 1, 2015, we realigned certain of our businesses among our reportable segments to correspond with internal management reporting changes and renamed our Employer Group segment to the Group segment. Our three reportable segments remain Retail, Group, and Healthcare Services. The more significant realignments included reclassifying Medicare benefits offered to groups to the Retail segment from the Group segment, bringing all of our Medicare offerings, which are now managed collectively, together in one segment, recognizing that in some instances we market directly to individuals that are part of a group Medicare account. In addition, we realigned our military services business, primarily consisting of our TRICARE South Region contract previously included in the Other Businesses category, to our Group segment as we consider this contract with the government to be a group account. Prior period segment financial information has been recast to conform to the 2015 presentation.

Health Care Reform

Health Care Reform

The Patient Protection and Affordable Care Act and The Health Care and Education Reconciliation Act of 2010 (which we collectively refer to as the Health Care Reform Law) enacted significant reforms to various aspects of the U.S. health insurance industry. Certain of these reforms became effective January 1, 2014, including an annual insurance industry premium-based fee and the establishment of federally-facilitated or state-based exchanges coupled with three premium stabilization programs, as described more fully below.

The Health Care Reform Law imposes an annual premium-based fee on health insurers for each calendar year beginning on or after January 1, 2014 which is not deductible for tax purposes. We are required to estimate a liability for the health insurer fee and record it in full once qualifying insurance coverage is provided in the applicable calendar year in which the fee is payable with a corresponding deferred cost that is amortized ratably to expense over the same calendar year. We record the liability for the health insurer fee in trade accounts payable and accrued expenses and record the deferred cost in other current assets in our consolidated financial statements. We pay the health insurer fee in September of each year. The Consolidated Appropriations Act, 2016, enacted on December 18, 2015, included a one-time one year suspension in 2017 of the health insurer fee. See Note 7 for detail regarding amounts paid for the annual health insurer fee.

The Health Care Reform Law also establishes risk spreading premium stabilization programs effective January 1, 2014. The risk spreading programs are applicable to certain of our commercial medical insurance products. In the aggregate, our commercial medical insurance products represented approximately 18% of our total premiums and services revenue for the year ended December 31, 2015, a subset of which is subject to these programs. These programs, commonly referred to as the 3Rs, include a permanent risk adjustment program, a transitional reinsurance program, and a temporary risk corridors program designed to more evenly spread the financial risk borne by issuers and to mitigate the risk that issuers would have mispriced products. The transitional reinsurance and temporary risk corridors programs are for years 2014 through 2016, with potential for additional reinsurance recoveries through 2018 to the extent funds are available. Policies issued prior to March 23, 2010 are considered grandfathered policies and are exempt from the 3Rs. Certain states have allowed non-grandfathered policies issued prior to January 1, 2014 to extend the date of required transition to policies compliant with the Health Care Reform Law to as late as 2017. Accordingly, such policies are exempt from the 3Rs until they transition to policies compliant with the Health Care Reform Law.

The permanent risk adjustment program adjusts the premiums that commercial individual and small group health insurance issuers receive based on the demographic factors and health status of each member as derived from current year medical diagnosis as reported throughout the year. This program transfers funds from lower risk plans to higher risk plans within similar plans in the same state. The risk adjustment program is applicable to commercial individual and small group health plans (except certain exempt and grandfathered plans as discussed above) operating both inside and outside of the health insurance exchanges established under the Health Care Reform Law. Under the risk adjustment program, a risk score is assigned to each covered member to determine an average risk score at the individual and small group level by legal entity in a particular market in a state. Additionally, an average risk score is determined for the entire subject population for each market in each state. Settlements are determined on a net basis by legal entity and state. Each health insurance issuer’s average risk score is compared to the state’s average risk score. Plans with an average risk score below the state average will pay into a pool and health insurance issuers with an average risk score that is greater than the state average risk score will receive money from that pool. We generally rely on providers, including certain network providers who are our employees, to appropriately document all medical data, including the diagnosis codes submitted with claims, as the basis for our risk scores under the program. Our estimate of amounts receivable and/or payable under the risk adjustment program is based on our estimate of both our own and the state average risk scores. Assumptions used in these estimates include but are not limited to published third party studies and other publicly available data including regulatory plan filings, geographic considerations including our historical experience in markets we have participated in over a long period of time, member demographics (including age and gender for our members and other health insurance issuers), our pricing model, sales data for each metal tier (different metal tiers yield different risk scores), and the mix of previously underwritten membership as compared to new members in plans compliant with the Health Care Reform Law. We refine our estimates as new information becomes available, including additional data released by the Department of Health and Human Services, or HHS, regarding estimates of state average risk scores. Risk adjustment is subject to audit by HHS beginning with the 2015 coverage year, however, there will be no payments associated with these audits for 2015, the pilot year for the audits.

The temporary risk corridor program applies to individual and small group Qualified Health Plans (or substantially equivalent plans), or QHPs, as defined by HHS, operating both inside and outside of the exchanges. Accordingly, plans subject to risk adjustment that are not QHPs, including our small group health plans, were not subject to the risk corridor program in 2014 or 2015. The risk corridor provisions limit issuer gains and losses by comparing allowable medical costs to a target amount, each defined/prescribed by HHS, and sharing the risk for allowable costs with the federal government. Allowable medical costs are adjusted for risk adjustment settlements, transitional reinsurance recoveries, and cost sharing reductions received from HHS. Variances from the target exceeding certain thresholds may result in HHS making additional payments to us or require us to refund HHS a portion of the premiums we received.

We estimate and recognize adjustments to premiums revenue for the risk adjustment and risk corridor provisions by projecting our ultimate premium for the calendar year separately for individual and group plans by state and legal entity. Estimated calendar year settlement amounts are recognized ratably during the year and are revised each period to reflect current experience, including changes in risk scores derived from medical diagnoses submitted by providers. We record receivables or payables at the individual or group level within each state and legal entity and classify the amounts as current or long-term in our consolidated balance sheets based on the timing of expected settlement.

The transitional reinsurance program requires us to make reinsurance contributions for calendar years 2014 through 2016 to a state or HHS established reinsurance entity based on a national contribution rate per covered member as determined by HHS. While all commercial medical plans, including self-funded plans, are required to fund the reinsurance entity, only fully-insured non-grandfathered plans compliant with the Health Care Reform Law in the individual commercial market will be eligible for recoveries if individual claims exceed a specified threshold. Accordingly, we account for transitional reinsurance contributions associated with all commercial medical health plans other than these non-grandfathered individual plans as an assessment in operating costs in our consolidated statements of income. We account for contributions made by individual commercial plans compliant with the Health Care Reform Law, which are subject to recoveries, as ceded premiums (a reduction of premiums) and similarly we account for any recoveries as ceded benefits (a reduction of benefits expense) in our consolidated statements of income.

We are required to remit payment for our per member reinsurance contribution, exclusive of the portion payable to the U.S. Treasury, by January 15 of the year following the coverage year, or January 15, 2016 for the 2015 coverage year. The portion of the reinsurance contribution due to the U.S. Treasury must be paid by November 15 of the year following the coverage year, or November 15, 2016 for the 2015 coverage year. Risk adjustment calculations will be completed and HHS will notify us of recoveries due or payments owed to/from us under the risk adjustment and reinsurance programs by June 30 of the year following the coverage year. Following this notification, risk corridor calculations are then due by July 31 of the year following the coverage year. Payments due to HHS under the risk adjustment and risk corridor programs must be remitted within 30 days of notification for each program and will be collected prior to the distribution of recoveries by HHS under each program. Payment and recovery amounts associated with reinsurance and risk adjustment will generally be settled with HHS annually in the year following the coverage year. Accordingly, for the 2015 coverage year, we expect to receive recoveries and/or pay amounts due under these programs in 2016. The risk corridor program is a three year program. We are required to pay gross risk corridor payables in the second half of the year following the coverage year. Interim settlements of risk corridor receivables in the year following the coverage year are limited to risk corridor amounts collected by HHS and available for distribution in the year following the coverage year. HHS guidance provides that risk corridor collections over the life of the three year program will first be applied to any shortfalls from previous coverage years before application to current year obligations.Risk corridor payables to issuers are obligations of the United States Government under the Health Care Reform law which requires the Secretary of HHS to make full payments to issuers. In the event of a shortfall at the end of the three year program, HHS has asserted it will explore other sources of funding for risk corridor payments, subject to the availability of appropriations.

See Note 7 for detail regarding amounts recorded to the consolidated balance sheets related to the 3Rs.

In addition to the provisions discussed above, beginning in 2014, HHS pays us a portion of the health care costs for low-income individual members for which we assume no risk in accordance with the Health Care Reform Law. We account for these subsidies as a deposit in our consolidated balance sheets and as a financing activity in our consolidated statements of cash flows. We do not recognize premiums revenue or benefits expense for these subsidies. Receipt and payment activity is accumulated at the state and legal entity level and recorded in our consolidated balance sheet in other current assets or trade accounts payable and accrued expenses depending on the state and legal entity balance at the end of the reporting period. We will be notified of final settlement amounts by June 30 of the year following the coverage year.

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents include cash, time deposits, money market funds, commercial paper, other money market instruments, and certain U.S. Government securities with an original maturity of three months or less. Carrying value approximates fair value due to the short-term maturity of the investments.

Investment Securities

Investment Securities

Investment securities, which consist entirely of debt securities, have been categorized as available for sale and, as a result, are stated at fair value. Investment securities available for current operations are classified as current assets. Investment securities available for our long-term insurance products and professional liability funding requirements, as well as restricted statutory deposits, are classified as long-term assets. For the purpose of determining gross realized gains and losses, which are included as a component of investment income in the consolidated statements of income, the cost of investment securities sold is based upon specific identification. Unrealized holding gains and losses, net of applicable deferred taxes, are included as a component of stockholders’ equity and comprehensive income until realized from a sale or other-than-temporary impairment.

Under the other-than-temporary impairment model for debt securities held, we recognize an impairment loss in income in an amount equal to the full difference between the amortized cost basis and the fair value when we have the intent to sell the debt security or it is more likely than not we will be required to sell the debt security before recovery of our amortized cost basis. However, if we do not intend to sell the debt security, we evaluate the expected cash flows to be received as compared to amortized cost and determine if a credit loss has occurred. In the event of a credit loss, only the amount of the impairment associated with the credit loss is recognized currently in income with the remainder of the loss recognized in other comprehensive income.

When we do not intend to sell a security in an unrealized loss position, potential other-than-temporary impairment is considered using a variety of factors, including the length of time and extent to which the fair value has been less than cost; adverse conditions specifically related to the industry, geographic area or financial condition of the issuer or underlying collateral of a security; payment structure of the security; changes in credit rating of the security by the rating agencies; the volatility of the fair value changes; and changes in fair value of the security after the balance sheet date. For debt securities, we take into account expectations of relevant market and economic data. For example, with respect to mortgage and asset-backed securities, such data includes underlying loan level data and structural features such as seniority and other forms of credit enhancements. A decline in fair value is considered other-than-temporary when we do not expect to recover the entire amortized cost basis of the security. We estimate the amount of the credit loss component of a debt security as the difference between the amortized cost and the present value of the expected cash flows of the security. The present value is determined using the best estimate of future cash flows discounted at the implicit interest rate at the date of purchase.

Receivables and Revenue Recognition

Receivables and Revenue Recognition

We generally establish one-year commercial membership contracts with employer groups, subject to cancellation by the employer group on 30-day written notice. Our Medicare contracts with CMS renew annually. Our military services contracts with the federal government and our contracts with various state Medicaid programs generally are multi-year contracts subject to annual renewal provisions. Individual polices are subject to the requirements of the Health Care Reform Law as discussed previously.

Premiums Revenue

We bill and collect premium from employer groups and members in our Medicare and other individual products monthly. We receive monthly premiums from the federal government and various states according to government specified payment rates and various contractual terms. Changes in revenues for our Medicare and individual commercial medical products resulting from the periodic changes in risk-adjustment scores derived from medical diagnoses for our membership and changes in risk corridor estimates are recognized when the amounts become determinable and the collectibility is reasonably assured.

Premiums revenue is estimated by multiplying the membership covered under the various contracts by the contractual rates. Premiums revenue is recognized as income in the period members are entitled to receive services, and is net of estimated uncollectible amounts, retroactive membership adjustments, and adjustments to recognize rebates under the minimum benefit ratios required under the Health Care Reform Law. We estimate policyholder rebates by projecting calendar year minimum benefit ratios for the individual, small group, and large group markets, as defined by the Health Care Reform Law using a methodology prescribed by HHS, separately by state and legal entity. Beginning in 2014, Medicare Advantage products were also subject to minimum benefit ratio requirements under the Health Care Reform Law. Estimated calendar year rebates recognized ratably during the year are revised each period to reflect current experience. Retroactive membership adjustments result from enrollment changes not yet processed, or not yet reported by an employer group or the government. We routinely monitor the collectibility of specific accounts, the aging of receivables, historical retroactivity trends, estimated rebates, as well as prevailing and anticipated economic conditions, and reflect any required adjustments in current operations. Premiums received prior to the service period are recorded as unearned revenues.

Medicare Part D

We cover prescription drug benefits in accordance with Medicare Part D under multiple contracts with CMS. The payments we receive monthly from CMS and members, which are determined from our annual bid, represent amounts for providing prescription drug insurance coverage. We recognize premiums revenue for providing this insurance coverage ratably over the term of our annual contract. Our CMS payment is subject to risk sharing through the Medicare Part D risk corridor provisions. In addition, receipts for reinsurance and low-income cost subsidies as well as receipts for certain discounts on brand name prescription drugs in the coverage gap represent payments for prescription drug costs for which we are not at risk.

The risk corridor provisions compare costs targeted in our bids to actual prescription drug costs, limited to actual costs that would have been incurred under the standard coverage as defined by CMS. Variances exceeding certain thresholds may result in CMS making additional payments to us or require us to refund to CMS a portion of the premiums we received. As risk corridor provisions are considered in our overall annual bid process, we estimate and recognize an adjustment to premiums revenue related to these provisions based upon pharmacy claims experience. We record a receivable or payable at the contract level and classify the amount as current or long-term in our consolidated balance sheets based on the timing of expected settlement.

Reinsurance and low-income cost subsidies represent funding from CMS in connection with the Medicare Part D program for which we assume no risk. Reinsurance subsidies represent funding from CMS for its portion of prescription drug costs which exceed the member’s out-of-pocket threshold, or the catastrophic coverage level. Low-income cost subsidies represent funding from CMS for all or a portion of the deductible, the coinsurance and co-payment amounts above the out-of-pocket threshold for low-income beneficiaries. Monthly prospective payments from CMS for reinsurance and low-income cost subsidies are based on assumptions submitted with our annual bid. A reconciliation and related settlement of CMS’s prospective subsidies against actual prescription drug costs we paid is made after the end of the year. The Health Care Reform Law mandates consumer discounts of 50% on brand name prescription drugs for Part D plan participants in the coverage gap. These discounts are funded by CMS and pharmaceutical manufacturers while we administer the application of these funds. We account for these subsidies and discounts as a deposit in our consolidated balance sheets and as a financing activity under receipts (withdrawals) from contract deposits in our consolidated statements of cash flows. For 2015, subsidy and discount payments of $8.9 billion exceeded reimbursements of $8.6 billion by $361 million. For 2014, subsidy and discount payments of $6.7 billion exceeded reimbursements of $5.8 billion by $945 million. For 2013, subsidy and discount payments of $4.8 billion exceeded reimbursements of $4.6 billion by $154 million. We do not recognize premiums revenue or benefit expenses for these subsidies or discounts. Receipt and payment activity is accumulated at the contract level and recorded in our consolidated balance sheets in other current assets or trade accounts payable and accrued expenses depending on the contract balance at the end of the reporting period.

Settlement of the reinsurance and low-income cost subsidies as well as the risk corridor payment is based on a reconciliation made approximately 9 months after the close of each calendar year. Settlement with CMS for brand name prescription drug discounts is based on a reconciliation made approximately 14 to 18 months after the close of each calendar year. We continue to revise our estimates with respect to the risk corridor provisions based on subsequent period pharmacy claims data. See Note 6 for detail regarding amounts recorded to our consolidated balance sheets related to the risk corridor settlement and subsidies from CMS.

Services Revenue

Patient services revenue

Patient services include injury and illness care and related services as well as other healthcare services related to employer needs or as required by law. Patient services revenues are recognized in the period services are provided to the customer when the sales price is fixed or determinable, and are net of contractual allowances.

Administrative services fees

Administrative services fees cover the processing of claims, offering access to our provider networks and clinical programs, and responding to customer service inquiries from members of self-funded groups. Revenues from providing administration services, also known as administrative services only, or ASO, are recognized in the period services are performed and are net of estimated uncollectible amounts. ASO fees are estimated by multiplying the membership covered under the various contracts by the contractual rates. Under ASO contracts, self-funded employers retain the risk of financing substantially all of the cost of health benefits. However, many ASO customers purchase stop loss insurance coverage from us to cover catastrophic claims or to limit aggregate annual costs. Accordingly, we have recorded premiums revenue and benefits expense related to these stop loss insurance contracts. We routinely monitor the collectibility of specific accounts, the aging of receivables, as well as prevailing and anticipated economic conditions, and reflect any required adjustments in current operations. ASO fees received prior to the service period are recorded as unearned revenues.

Under our current TRICARE South Region contract with the Department of Defense, we provide administrative services, including offering access to our provider networks and clinical programs, claim processing, customer service, enrollment, and other services, while the federal government retains all of the risk of the cost of health benefits. We account for revenues under the current contract net of estimated health care costs similar to an administrative services fee only agreement. The current contract includes fixed administrative services fees and incentive fees and penalties. Administrative services fees are recognized as services are performed.

Our TRICARE members are served by both in-network and out-of-network providers in accordance with the current contract. We pay health care costs related to these services to the providers and are subsequently reimbursed by the DoD for such payments. We account for the payments of the federal government’s claims and the related reimbursements under deposit accounting in our consolidated balance sheets and as a financing activity under receipts (withdrawals) from contract deposits in our consolidated statements of cash flows. For 2015, health care cost reimbursements and payments were each approximately $3.3 billion, with payments exceeding reimbursements by $4 million for the year. For 2014, health care cost reimbursements and payments were each $3.2 billion. For 2013, health care cost reimbursements and payments were each approximately $3.2 billion, with reimbursements exceeding payments by $5 million for the year.

Receivables

Receivables, including premium receivables, patient services revenue receivables, and ASO fee receivables, are shown net of allowances for estimated uncollectible accounts, retroactive membership adjustments, and contractual allowances.

Policy Acquisition Costs

Policy Acquisition Costs

Policy acquisition costs are those costs that relate directly to the successful acquisition of new and renewal insurance policies. Such costs include commissions, costs of policy issuance and underwriting, and other costs we incur to acquire new business or renew existing business. We expense policy acquisition costs related to our employer-group prepaid health services policies as incurred. These short-duration employer-group prepaid health services policies typically have a 1-year term and may be cancelled upon 30 days notice by the employer group.

Life insurance, annuities, and certain health and other supplemental policies sold to individuals are accounted for as long-duration insurance products because they are expected to remain in force for an extended period beyond one year and premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. As a result, we defer policy acquisition costs, primarily consisting of commissions, and amortize them over the estimated life of the policies in proportion to premiums earned. Deferred acquisition costs are reviewed to determine if they are recoverable from future income. See Note 18.

Beginning in 2014, health policies sold to individuals that conform to the Health Care Reform Law are accounted for under a short-duration model and accordingly policy acquisition costs are expensed as incurred because premiums received in the current year are intended to pay anticipated benefits in that year.

Long-Lived Assets

Long-Lived Assets

Property and equipment is recorded at cost. Gains and losses on sales or disposals of property and equipment are included in operating costs. Certain costs related to the development or purchase of internal-use software are capitalized. Depreciation is computed using the straight-line method over estimated useful lives ranging from 3 to 10 years for equipment, 3 to 7 years for computer software, and 20 to 40 years for buildings. Improvements to leased facilities are depreciated over the shorter of the remaining lease term or the anticipated life of the improvement.

We periodically review long-lived assets, including property and equipment and other intangible assets, for impairment whenever adverse events or changes in circumstances indicate the carrying value of the asset may not be recoverable. Losses are recognized for a long-lived asset to be held and used in our operations when the undiscounted future cash flows expected to result from the use of the asset are less than its carrying value. We recognize an impairment loss based on the excess of the carrying value over the fair value of the asset. A long-lived asset held for sale is reported at the lower of the carrying amount or fair value less costs to sell. Depreciation expense is not recognized on assets held for sale. Losses are recognized for a long-lived asset to be abandoned when the asset ceases to be used. In addition, we periodically review the estimated lives of all long-lived assets for reasonableness.

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets

Goodwill represents the unamortized excess of cost over the fair value of the net tangible and other intangible assets acquired. We are required to test at least annually for impairment at a level of reporting referred to as the reporting unit, and more frequently if adverse events or changes in circumstances indicate that the asset may be impaired. A reporting unit either is our operating segments or one level below the operating segments, referred to as a component, which comprise our reportable segments. A component is considered a reporting unit if the component constitutes a business for which discrete financial information is available that is regularly reviewed by management. We aggregate the components of an operating segment into one reporting unit if they have similar economic characteristics. Goodwill is assigned to the reporting unit that is expected to benefit from a specific acquisition.

We use a two-step process to review goodwill for impairment. The first step is a screen for potential impairment, and the second step measures the amount of impairment, if any. Impairment tests are performed, at a minimum, in the fourth quarter of each year supported by our long-range business plan and annual planning process. We rely on an evaluation of future discounted cash flows to determine fair value of our reporting units. Impairment tests completed for 2015, 2014, and 2013 did not result in an impairment loss.

Other intangible assets primarily relate to acquired customer contracts/relationships and are included with other long-term assets in the consolidated balance sheets. Other intangible assets are amortized over the useful life, based upon the pattern of future cash flows attributable to the asset. This sometimes results in an accelerated method of amortization for customer contracts because the asset tends to dissipate at a more rapid rate in earlier periods. Other than customer contracts, other intangible assets generally are amortized using the straight-line method. We review other finite-lived intangible assets for impairment under our long-lived asset policy.

Benefits Payable and Benefits Expense Recognition

Benefits Payable and Benefits Expense Recognition

Benefits expense includes claim payments, capitation payments, pharmacy costs net of rebates, allocations of certain centralized expenses and various other costs incurred to provide health insurance coverage to members, as well as estimates of future payments to hospitals and others for medical care and other supplemental benefits provided on or prior to the balance sheet date. Capitation payments represent monthly contractual fees disbursed to primary care and other providers who are responsible for providing medical care to members. Pharmacy costs represent payments for members’ prescription drug benefits, net of rebates from drug manufacturers. Receivables for such pharmacy rebates are included in other current assets in our consolidated balance sheets. Other supplemental benefits include dental, vision, and other supplemental health and financial protection products.

We estimate the costs of our benefits expense payments using actuarial methods and assumptions based upon claim payment patterns, medical cost inflation, historical developments such as claim inventory levels and claim receipt patterns, and other relevant factors, and record benefit reserves for future payments. We continually review estimates of future payments relating to claims costs for services incurred in the current and prior periods and make necessary adjustments to our reserves.

We reassess the profitability of our contracts for providing insurance coverage to our members when current operating results or forecasts indicate probable future losses. We establish a premium deficiency reserve in current operations to the extent that the sum of expected future costs, claim adjustment expenses, and maintenance costs exceeds related future premiums under contracts without consideration of investment income. For purposes of determining premium deficiencies, contracts are grouped in a manner consistent with our method of acquiring, servicing, and measuring the profitability of such contracts. Losses recognized as a premium deficiency result in a beneficial effect in subsequent periods as operating losses under these contracts are charged to the liability previously established. Because the majority of our member contracts renew annually, we would not record a material premium deficiency reserve, except when unanticipated adverse events or changes in circumstances indicate otherwise. In the fourth quarter of 2015, we recognized a premium deficiency reserve for our individual commercial medical business compliant with the Health Care Reform Law associated with the 2016 coverage year as discussed in more detail in Note 7.

We believe our benefits payable are adequate to cover future claims payments required. However, such estimates are based on knowledge of current events and anticipated future events. Therefore, the actual liability could differ materially from the amounts provided.

Future Policy Benefits Payable

Future policy benefits payable

Future policy benefits payable include liabilities for long-duration insurance policies including long-term care, life insurance, annuities, and certain health and other supplemental policies sold to individuals for which some of the premium received in the earlier years is intended to pay anticipated benefits to be incurred in future years. At policy issuance, these reserves are recognized on a net level premium method based on interest rates, mortality, morbidity, and maintenance expense assumptions. Interest rates are based on our expected net investment returns on the investment portfolio supporting the reserves for these blocks of business. Mortality, a measure of expected death, and morbidity, a measure of health status, assumptions are based on published actuarial tables, modified based upon actual experience. Changes in estimates of these reserves are recognized as an adjustment to benefits expense in the period the changes occur. We perform loss recognition tests at least annually in the fourth quarter, and more frequently if adverse events or changes in circumstances indicate that the level of the liability, together with the present value of future gross premiums, may not be adequate to provide for future expected policy benefits and maintenance costs. We adjust future policy benefits payable for the additional liability that would have been recorded if investment securities backing the liability had been sold at their stated aggregate fair value and the proceeds reinvested at current yields. We include the impact of this adjustment, if any, net of applicable deferred taxes, with the change in unrealized investment gain (loss) in accumulated other comprehensive income in stockholders’ equity. As discussed previously, beginning in 2014, health policies sold to individuals that conform to the Health Care Reform Law are accounted for under a short-duration model under which policy reserves are not established because premiums received in the current year are intended to pay anticipated benefits in that year.

Book Overdraft

Book Overdraft

Under our cash management system, checks issued but not yet presented to banks that would result in negative bank balances when presented are classified as a current liability in the consolidated balance sheets. Changes in book overdrafts from period to period are reported in the consolidated statement of cash flows as a financing activity.

Income Taxes

Income Taxes

We recognize an asset or liability for the deferred tax consequences of temporary differences between the tax bases of assets or liabilities and their reported amounts in the consolidated financial statements. These temporary differences will result in taxable or deductible amounts in future years when the reported amounts of the assets or liabilities are recovered or settled. We also recognize the future tax benefits such as net operating and capital loss carryforwards as deferred tax assets. A valuation allowance is provided against these deferred tax assets if it is more likely than not that some portion or all of the deferred tax assets will not be realized. Future years’ tax expense may be increased or decreased by adjustments to the valuation allowance or to the estimated accrual for income taxes.

We record tax benefits when it is more likely than not that the tax return position taken with respect to a particular transaction will be sustained. A liability, if recorded, is not considered resolved until the statute of limitations for the relevant taxing authority to examine and challenge the tax position has expired, or the tax position is ultimately settled through examination, negotiation, or litigation. We classify interest and penalties associated with uncertain tax positions in our provision for income taxes.

Derivative Financial Instruments

Derivative Financial Instruments

On October 29, 2012, we acquired a noncontrolling equity interest in MCCI Holdings, LLC, or MCCI, a privately held Medical Services Organization, or MSO, headquartered in Miami, Florida, that primarily coordinates medical care for Medicare Advantage beneficiaries in Florida, Texas and Georgia. Our agreement with MCCI includes a put option that would allow the controlling interest holder to put their interest to us beginning in 2018 as well as a call option that would allow us to purchase the controlling interest beginning in 2021. Accordingly, we recorded, at fair value, a liability and an asset associated with the put and call, respectively. Changes in the fair value of the liability and asset during the years ended December 31,2015, 2014, and 2013 were not material to our results of operations, financial condition, or cash flows.

At times, we may use interest-rate swap agreements to manage our exposure to interest rate risk. The differential between fixed and variable rates to be paid or received is accrued and recognized over the life of the agreements as adjustments to interest expense in the consolidated statements of income.

Stock-Based Compensation

Stock-Based Compensation

We generally recognize stock-based compensation expense, as determined on the date of grant at fair value, on a straight-line basis over the period during which an employee is required to provide service in exchange for the award (the vesting period). In addition, for awards with both time and performance-based conditions, we generally recognize compensation expense on a straight line basis over the vesting period when it is probable that the performance condition will be achieved. However, prior to July 2, 2015, for awards granted to retirement eligible employees, compensation expense is recognized on a straight-line basis over the shorter of the requisite service period or the period from the date of grant to an employee’s eligible retirement date. For awards granted on or after July 2, 2015 to retirement eligible employees, we recognize expense on a straight-line basis over the service period (the vesting period). We estimate expected forfeitures and recognize compensation expense only for those awards which are expected to vest. We estimate the grant-date fair value of stock options using the Black-Scholes option-pricing model. In addition, we report certain tax effects of stock-based compensation as a financing activity rather than an operating activity in the consolidated statement of cash flows. Additional detail regarding our stock-based compensation plans is included in Note 13.

Earnings Per Common Share

Earnings Per Common Share

We compute basic earnings per common share on the basis of the weighted-average number of unrestricted common shares outstanding. Diluted earnings per common share is computed on the basis of the weighted-average number of unrestricted common shares outstanding plus the dilutive effect of outstanding employee stock options and restricted shares, or units, using the treasury stock method.

Fair Value

Fair Value

Assets and liabilities measured at fair value are categorized into a fair value hierarchy based on whether the inputs to valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our own assumptions about the assumptions market participants would use. The fair value hierarchy includes three levels of inputs that may be used to measure fair value as described below.

Level 1 – Quoted prices in active markets for identical assets or liabilities. Level 1 assets and liabilities include debt securities that are traded in an active exchange market.

Level 2 – Observable inputs other than Level 1 prices such as quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments as well as debt securities whose value is determined using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data.

Level 3 – Unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities. Level 3 includes assets and liabilities whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques reflecting our own assumptions about the assumptions market participants would use as well as those requiring significant management judgment.

Fair value of actively traded debt securities are based on quoted market prices. Fair value of other debt securities are based on quoted market prices of identical or similar securities or based on observable inputs like interest rates generally using a market valuation approach, or, less frequently, an income valuation approach and are generally classified as Level 2. We obtain at least one price for each security from a third party pricing service. These prices are generally derived from recently reported trades for identical or similar securities, including adjustments through the reporting date based upon observable market information. When quoted prices are not available, the third party pricing service may use quoted market prices of comparable securities or discounted cash flow analyses, incorporating inputs that are currently observable in the markets for similar securities. Inputs that are often used in the valuation methodologies include benchmark yields, reported trades, credit spreads, broker quotes, default rates, and prepayment speeds. We are responsible for the determination of fair value and as such we perform analysis on the prices received from the third party pricing service to determine whether the prices are reasonable estimates of fair value. Our analysis includes a review of monthly price fluctuations as well as a quarterly comparison of the prices received from the pricing service to prices reported by our third party investment advisor. In addition, on a quarterly basis we examine the underlying inputs and assumptions for a sample of individual securities across asset classes, credit rating levels, and various durations.

Fair value of privately held debt securities, as well as auction rate securities, are estimated using a variety of valuation methodologies, including both market and income approaches, where an observable quoted market does not exist and are generally classified as Level 3. For privately-held debt securities, such methodologies include reviewing the value ascribed to the most recent financing, comparing the security with securities of publicly-traded companies in similar lines of business, and reviewing the underlying financial performance including estimating discounted cash flows. Auction rate securities are debt instruments with interest rates that reset through periodic short-term auctions. From time to time, liquidity issues in the credit markets have led to failed auctions. Given the liquidity issues, fair value could not be estimated based on observable market prices, and as such, unobservable inputs were used. For auction rate securities, valuation methodologies include consideration of the quality of the sector and issuer, underlying collateral, underlying final maturity dates, and liquidity.

Recently Issued Accounting Pronouncements

Recently Issued Accounting Pronouncements

In January 2016, the Financial Accounting Standards Board, or FASB, issued new guidance related to classification and measurement of financial instruments which requires equity securities that are not accounted for using the equity method or that do not result in consolidation, to be accounted for at fair value with changes in fair value recognized through net income. The new guidance is effective for us beginning with annual and interim periods in 2018 with early adoption permitted under certain circumstances. We are currently evaluating the impact, if any, on our results of operations, financial position, and cash flows.

In November 2015, the FASB issued new guidance related to accounting for income taxes which changes the balance sheet classification of deferred taxes, requiring deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position. The new guidance is effective for us beginning with annual and interim periods in 2017, with early adoption permitted. We elected to early adopt the guidance and have classified all deferred tax liabilities and assets as noncurrent in our consolidated balance sheet at December 31, 2015 to simplify their presentation. Prior periods were not retrospectively adjusted. The adoption of the new guidance did not have any impact on our results of operations or cash flows.

In May 2015, the FASB issued new guidance requiring insurance entities to provide additional disclosures about claim liabilities including paid claims development information by accident year and claim frequency data and related methodologies. The guidance is effective for us beginning with the 2016 annual reporting period and interim periods beginning in 2017. We are currently evaluating the impact the new guidance will have on our disclosures.

In April 2015, the FASB issued new guidance to help entities determine whether a cloud computing arrangement contains a software license that should be accounted for as internal-use software or as a service contract. The guidance is effective for us beginning with interim and annual reporting periods in 2016, with early adoption permitted. Upon adoption, an entity has the option to apply the provisions either prospectively to all arrangements entered into or materially modified, or retrospectively. We are currently evaluating the impact, if any, on our results of operations, financial position, and cash flows.

In March 2015, the FASB issued new guidance which changes the presentation of debt issuance costs from an asset to a direct reduction of the related debt liability. The new guidance is effective for us beginning with annual and interim periods in 2016 with early adoption permitted. The adoption of the new guidance will not have a material impact on our results of operations, financial condition, or cash flows.

In February 2015, the FASB issued an amendment to current consolidation guidance that modifies the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, eliminating the presumption that a general partner should consolidate a limited partnership, and affects the consolidation analysis of reporting entities that are involved with variable interest entities. The new guidance is effective for us beginning with interim and annual reporting periods in 2016, with early adoption permitted. All legal entities are subject to reevaluation under the revised consolidation model. We are currently evaluating the impact, if any, on our results of operations, financial position, and cash flows.

In May 2014, the FASB issued new guidance that amends the accounting for revenue recognition. The amendments are intended to provide a more robust framework for addressing revenue issues, improve comparability of revenue recognition practices, and improve disclosure requirements. Insurance contracts are not included in the scope of this new guidance. In July 2015, the FASB decided to defer the effective date provided in the new revenue guidance by one year. Giving effect to this deferral, the new guidance is effective for us beginning with annual and interim periods in 2018. We are currently evaluating the impact on our results of operations, financial condition, and cash flows.

There are no other recently issued accounting standards that apply to us or that are expected to have a material impact on our results of operations, financial condition, or cash flows.

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ACQUISITIONS AND DIVESTITURES ACQUISITIONS AND DIVESTITURES (Tables)

12 Months Ended

Dec. 31, 2015

Business Combinations [Abstract]

Schedule of assets and liabilities classified as held-for-sale

The assets and liabilities of Concentra that were disposed of on June 1, 2015 and classified as held-for-sale as of December 31, 2014 were as follows:

	June 1, 2015		December 31, 2014
Assets	(in millions)
Receivables, net	$	130	$	115
Property and equipment, net	197		191
Goodwill	480		480
Other intangible assets, net	124		132
Other assets	27		25
Total assets disposed/held-for-sale	$	958	$	943
Liabilities
Trade accounts payable and accrued expenses	81		90
Other liabilities	114		116
Total liabilities disposed/held-for-sale	$	195	$	206
Net assets disposed	$	763	$	737

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INVESTMENT SECURITIES (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Schedule of Investment Securities Classified as Current and Long-Term

Investment securities classified as current and long-term were as follows at December 31, 2015 and 2014, respectively:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in millions)
December 31, 2015
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	331	$	2	$	(1	)	$	332
Mortgage-backed securities	1,902		12		(23		)	1,891
Tax-exempt municipal securities	2,611		61		(4		)	2,668
Mortgage-backed securities:
Residential	13		—		—			13
Commercial	1,024		2		(41		)	985
Asset-backed securities	264		1		(2		)	263
Corporate debt securities	2,873		140		(55		)	2,958
Total debt securities	$	9,018	$	218	$	(126	)	$	9,110
December 31, 2014
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	365	$	10	$	(1	)	$	374
Mortgage-backed securities	1,453		50		(5		)	1,498
Tax-exempt municipal securities	2,931		140		(3		)	3,068
Mortgage-backed securities:
Residential	17		—		—			17
Commercial	846		16		(19		)	843
Asset-backed securities	28		1		—			29
Corporate debt securities	3,432		299		(13		)	3,718
Total debt securities	$	9,072	$	516	$	(41	)	$	9,547

Schedule of Gross Unrealized Losses and Fair Value of Securities

Gross unrealized losses and fair values aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position were as follows at December 31, 2015 and 2014, respectively:

	Less than 12 months					12 months or more					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	(in millions)
December 31, 2015
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	195	$	(1	)	$	14	$	—		$	209	$	(1	)
Mortgage-backed securities	1,484		(20		)	86		(3		)	1,570		(23		)
Tax-exempt municipal securities	843		(3		)	52		(1		)	895		(4		)
Mortgage-backed securities:
Residential	2		—			4		—			6		—
Commercial	626		(13		)	265		(28		)	891		(41		)
Asset-backed securities	258		(2		)	—		—			258		(2		)
Corporate debt securities	918		(45		)	63		(10		)	981		(55		)
Total debt securities	$	4,326	$	(84	)	$	484	$	(42	)	$	4,810	$	(126	)
December 31, 2014
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	$	79	$	—		$	80	$	(1	)	$	159	$	(1	)
Mortgage-backed securities	22		—			320		(5		)	342		(5		)
Tax-exempt municipal securities	131		(1		)	118		(2		)	249		(3		)
Mortgage-backed securities:
Residential	1		—			4		—			5		—
Commercial	31		(1		)	267		(18		)	298		(19		)
Asset-backed securities	13		—			—		—			13		—
Corporate debt securities	219		(6		)	128		(7		)	347		(13		)
Total debt securities	$	496	$	(8	)	$	917	$	(33	)	$	1,413	$	(41	)

Schedule of Realized Gains (Losses) Related to Investment Securities Included Within Investment Income

The detail of realized gains (losses) related to investment securities and included within investment income was as follows for the years ended December 31, 2015, 2014, and 2013:

	2015			2014			2013
	(in millions)
Gross realized gains	$	179		$	29		$	33
Gross realized losses	(33		)	(9		)	(11		)
Net realized capital gains	$	146		$	20		$	22

Schedule of Contractual Maturity of Debt Securities Available for Sale

The contractual maturities of debt securities available for sale at December 31, 2015, regardless of their balance sheet classification, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Amortized Cost		Fair Value
	(in millions)
Due within one year	$	438	$	439
Due after one year through five years	1,829		1,871
Due after five years through ten years	1,244		1,264
Due after ten years	2,304		2,384
Mortgage and asset-backed securities	3,203		3,152
Total debt securities	$	9,018	$	9,110

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FAIR VALUE (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Financial Assets Measured at Fair Value on Recurring Basis

The following table summarizes our fair value measurements at December 31, 2015 and 2014, respectively, for financial assets measured at fair value on a recurring basis:

			Fair Value Measurements Using
	Fair Value		Quoted Prices in Active Markets (Level 1)		Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
	(in millions)
December 31, 2015
Cash equivalents	$	2,229	$	2,229	$	—	$	—
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	332		—		332		—
Mortgage-backed securities	1,891		—		1,891		—
Tax-exempt municipal securities	2,668		—		2,663		5
Mortgage-backed securities:
Residential	13		—		13		—
Commercial	985		—		985		—
Asset-backed securities	263		—		263		—
Corporate debt securities	2,958		—		2,952		6
Total debt securities	9,110		—		9,099		11
Total invested assets	$	11,339	$	2,229	$	9,099	$	11
December 31, 2014
Cash equivalents	$	1,712	$	1,712	$	—	$	—
Debt securities:
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations	374		—		374		—
Mortgage-backed securities	1,498		—		1,498		—
Tax-exempt municipal securities	3,068		—		3,060		8
Mortgage-backed securities:
Residential	17		—		17		—
Commercial	843		—		843		—
Asset-backed securities	29		—		28		1
Corporate debt securities	3,718		—		3,695		23
Total debt securities	9,547		—		9,515		32
Total invested assets	$	11,259	$	1,712	$	9,515	$	32

Changes in Fair Value of Assets Measured Using Significant Unobservable Inputs

During the years ended December 31, 2015, 2014, and 2013, the changes in the fair value of the assets measured using significant unobservable inputs (Level 3) were comprised of the following:

	For the years ended December 31,
	2015									2014								2013
	Private Placements			Auction Rate Securities			Total			Private Placements		Auction Rate Securities			Total			Private Placements			Auction Rate Securities		Total
	(in millions)
Beginning balance at January 1	$	24		$	8		$	32		$	24	$	13		$	37		$	25		$	13	$	38
Total gains or losses:
Realized in earnings	(1		)	—			(1		)	—		—			—			—			—		—
Unrealized in other comprehensive income	—			—			—			—		—			—			—			—		—
Purchases	—			—			—			—		—			—			—			—		—
Sales	(17		)	(3		)	(20		)	—		(5		)	(5		)	—			—		—
Settlements	—			—			—			—		—			—			(1		)	—		(1		)
Balance at December 31	$	6		$	5		$	11		$	24	$	8		$	32		$	24		$	13	$	37

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MEDICARE PART D (Tables)

12 Months Ended

Dec. 31, 2015

Insurance [Abstract]

Balance Sheet Amounts Associated With Medicare Part D

The accompanying consolidated balance sheets include the following amounts associated with Medicare Part D as of December 31, 2015 and 2014. CMS subsidies/discounts in the table below include the reinsurance and low-income cost subsidies funded by CMS for which we assume no risk as well as brand name prescription drug discounts for Part D plan participants in the coverage gap funded by CMS and pharmaceutical manufacturers.

	2015						2014
	Risk Corridor Settlement			CMS Subsidies/ Discounts			Risk Corridor Settlement			CMS Subsidies/ Discounts
	(in millions)
Other current assets	$	25		$	2,082		$	105		$	1,690
Trade accounts payable and accrued expenses	(47		)	(63		)	(36		)	(32		)
Net current (liability) asset	$	(22	)	$	2,019		$	69		$	1,658

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HEALTH CARE REFORM (Tables)

12 Months Ended

Dec. 31, 2015

Insurance [Abstract]

Schedule Of Risk Adjustment, Reinsurance Recoverable And Risk Corridor Settlement

The accompanying consolidated balance sheets include the following amounts associated with the 3Rs at December 31, 2015 and December 31, 2014. Amounts classified as long-term represent settlements that we expect to exceed 12 months at December 31, 2015.

	2015							2014
	Risk Adjustment Settlement			Reinsurance Recoverables		Risk Corridor Settlement		Risk Adjustment Settlement			Reinsurance Recoverables		Risk Corridor Settlement
	(in millions)
2014 Coverage Year
Premiums receivable	$	4		$	—	$	—	$	131		$	—	$	—
Other current assets	—			—		—		—			586		55
Trade accounts payable and accrued expenses	—			—		—		(89		)	—		(4		)
Net current asset	4			—		—		42			586		51
Other long-term assets	—			—		215		—			—		—
Other long-term liabilities	—			—		—		—			—		—
Net long-term asset	—			—		215		—			—		—
Total 2014 coverage year net asset	4			—		215		42			586		51
2015 Coverage Year
Premiums receivable	122			—		—		—			—		—
Other current assets	—			610		—		—			—		—
Trade accounts payable and accrued expenses	(223		)	—		—		—			—		—
Net current (liability) asset	(101		)	610		—		—			—		—
Other long-term assets	10			—		244		—			—		—
Other long-term liabilities	—			—		—		—			—		—
Net long-term asset	10			—		244		—			—		—
Total 2015 coverage year net (liability) asset	(91		)	610		244		—			—		—
Total net (liability) asset	$	(87	)	$	610	$	459	$	42		$	586	$	51

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PROPERTY AND EQUIPMENT, NET (Tables)

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

PROPERTY AND EQUIPMENT, NET

Property and equipment was comprised of the following at December 31, 2015 and 2014, excluding Concentra amounts classified as held-for-sale at December 31, 2014 for comparative purposes. Net property and equipment associated with Concentra and classified as held-for sale at December 31, 2014 was $191 million.

	2015			2014
	(in millions)
Land	$	20		$	18
Buildings and leasehold improvements	633			602
Equipment	645			631
Computer software	1,424			1,656
	2,722			2,907
Accumulated depreciation	(1,338		)	(1,679		)
Property and equipment, net	$	1,384		$	1,228

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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill By Reportable Segments

Changes in the carrying amount of goodwill for our reportable segments for the years ended December 31, 2015 and 2014 were as follows:

	Retail		Group		Healthcare Services			Total
	(in millions)
Balance at January 1, 2014	$	1,069	$	385	$	1,799		$	3,253
Acquisitions	—		—		19			19
Dispositions	—		—		(40		)	(40		)
Subsequent payments/adjustments	—		—		(1		)	(1		)
Balance at December 31, 2014	1,069		385		1,777			3,231
Acquisitions	—		—		35			35
Dispositions	—		—		(1		)	(1		)
Balance at December 31, 2015	$	1,069	$	385	$	1,811		$	3,265

Details of Intangible Assets Included in Other Long-Term Assets

The following table presents details of our other intangible assets included in other long-term assets in the accompanying consolidated balance sheets at December 31, 2015 and 2014 and excludes Concentra amounts classified as held-for-sale as of December 31, 2014 for comparative purposes. Net other intangible assets associated with Concentra and classified as held-for-sale at December 31, 2014 were $132 million.

	Weighted Average Life	2015						2014
		Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
		(in millions)
Other intangible assets:
Customer contracts/relationships	9.8 years	$	566	$	292	$	274	$	657	$	326	$	331
Trade names and technology	8.3 years	104		54		50		115		50		65
Provider contracts	14.6 years	51		24		27		52		21		31
Noncompetes and other	8.2 years	32		26		6		41		28		13
Total other intangible assets	9.8 years	$	753	$	396	$	357	$	865	$	425	$	440

Schedule of Estimated Amortization Expense

The following table presents our estimate of amortization expense for each of the five next succeeding fiscal years:

	(in millions)
For the years ending December 31,:
2016	$	78
2017	71
2018	62
2019	51
2020	47

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BENEFITS PAYABLE (Tables)

12 Months Ended

Dec. 31, 2015

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Activity in Benefits Payable

Activity in benefits payable, excluding military services, was as follows for the years ended December 31, 2015, 2014 and 2013:

	2015			2014			2013
	(in millions)
Balances at January 1	$	4,475		$	3,893		$	3,775
Less: Reinsurance recoverables	(78		)	—			—
Balances at January 1, net	4,397			3,893			3,775
Acquisitions	—			—			5
Incurred related to:
Current year	44,397			38,641			32,711
Prior years	(236		)	(518		)	(474		)
Total incurred	44,161			38,123			32,237
Paid related to:
Current year	(39,802		)	(34,357		)	(29,103		)
Prior years	(4,041		)	(3,262		)	(3,021		)
Total paid	(43,843		)	(37,619		)	(32,124		)
Premium deficiency reserve	176			—			—
Reinsurance recoverable	85			78			—
Balances at December 31	$	4,976		$	4,475		$	3,893

Benefit Expenses Excluded From Activity in Benefits Payable

Benefits expense excluded from the previous table was as follows for the years ended December 31, 2015, 2014 and 2013:

	2015			2014		2013
	(in millions)
Premium deficiency reserve for short-duration policies	$	176		$	—	$	—
Military services	12			11		(27		)
Future policy benefits	(80		)	32		354
Total	$	108		$	43	$	327

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INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Provision for Income Taxes

The provision for income taxes consisted of the following for the years ended December 31, 2015, 2014 and 2013:

	2015			2014			2013
	(in millions)
Current provision:
Federal	$	1,067		$	1,006		$	595
States and Puerto Rico	90			81			53
Total current provision	1,157			1,087			648
Deferred (benefit) provision	(2		)	(64		)	42
Provision for income taxes	$	1,155		$	1,023		$	690

Provision for Income Taxes Using Federal Statutory Rate

The provision for income taxes was different from the amount computed using the federal statutory rate for the years ended December 31, 2015, 2014 and 2013 due to the following:

	2015			2014			2013
	(in millions)
Income tax provision at federal statutory rate	$	851		$	759		$	672
States, net of federal benefit, and Puerto Rico	44			48			32
Tax exempt investment income	(24		)	(27		)	(26		)
Health insurer fee	314			204			—
Nondeductible executive compensation	18			22			6
Concentra sale	(67		)	—			—
Other, net	19			17			6
Provision for income taxes	$	1,155		$	1,023		$	690

Principal Components of Net Deferred Tax Balances

Principal components of our net deferred tax balances at December 31, 2015 and 2014 were as follows, excluding Concentra amounts classified as held-for-sale at December 31, 2014 for comparative purposes. The net deferred tax liability associated with Concentra and classified as held-for sale at December 31, 2014 was $55 million.

	Assets (Liabilities)
	2015			2014
	(in millions)
Future policy benefits payable	$	200		$	320
Compensation and other accrued expenses	130			168
Benefits payable	267			138
Net operating loss carryforward	47			52
Deferred acquisition costs	64			57
Unearned revenues	22			21
Other	13			17
Total deferred income tax assets	743			773
Valuation allowance	(42		)	(48		)
Total deferred income tax assets, net of valuation allowance	701			725
Depreciable property and intangible assets	(363		)	(346		)
Investment securities	(37		)	(168		)
Prepaid expenses	(45		)	(55		)
Total deferred income tax liabilities	(445		)	(569		)
Total net deferred income tax assets	$	256		$	156
Amounts recognized in the consolidated balance sheets:
Other current assets	$	—		$	79
Other long-term assets	256			77
Total net deferred income tax assets	$	256		$	156

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DEBT (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Carrying Value of Long-Term Debt Outstanding

The carrying value of long-term debt outstanding was as follows at December 31, 2015 and 2014:

	2015		2014
	(in millions)
Long-term debt:
Senior notes:
$500 million, 7.20% due June 15, 2018	$	503	$	504
$300 million, 6.30% due August 1, 2018	309		312
$400 million, 2.625% due October 1, 2019	400		400
$600 million, 3.15% due December 1, 2022	598		598
$600 million, 3.85% due October 1, 2024	599		599
$250 million, 8.15% due June 15, 2038	266		266
$400 million, 4.625% due December 1, 2042	400		400
$750 million, 4.95% due October 1, 2044	746		746
Total long-term debt	$	3,821	$	3,825

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EMPLOYEE BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Stock-Based Compensation Expense

The compensation expense that has been charged against income for these plans was as follows for the years ended December 31,2015, 2014, and 2013:

	2015			2014			2013
	(in millions)
Stock-based compensation expense by type:
Restricted stock	$	99		$	91		$	84
Stock options	10			7			8
Total stock-based compensation expense	109			98			92
Tax benefit recognized	(26		)	(22		)	(22		)
Stock-based compensation expense, net of tax	$	83		$	76		$	70

Activity for Restricted Stock Awards

Activity for our restricted stock was as follows for the year ended December 31, 2015:

	Shares		Weighted- Average Grant-Date Fair Value
	(shares in thousands)
Nonvested restricted stock at December 31, 2014	3,635		$	85.52
Granted	837		165.26
Vested	(919	)	84.95
Forfeited	(188	)	98.92
Nonvested restricted stock at December 31, 2015	3,365		$	104.58

Weighted-Average Fair Value of Stock Options

The fair value was estimated on the date of grant using the Black-Scholes pricing model with the weighted-average assumptions indicated below:

	2015			2014			2013
Weighted-average fair value at grant date	$	36.91		$	22.45		$	21.80
Expected option life (years)	4.2 years			4.3 years			4.4 years
Expected volatility	27.4		%	27.6		%	38.8		%
Risk-free interest rate at grant date	1.4		%	1.3		%	0.8		%
Dividend yield	0.7		%	1.1		%	1.5		%

Activity for Option Plans

Activity for our option plans was as follows for the year ended December 31, 2015:

	Shares  Under Option		Weighted-Average Exercise Price
	(shares in thousands)
Options outstanding at December 31, 2014	768		$	82.45
Granted	377		164.80
Exercised	(304	)	76.25
Forfeited	(6	)	83.58
Options outstanding at December 31, 2015	835		$	121.89
Options exercisable at December 31, 2015	203		$	78.30

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EARNINGS PER COMMON SHARE COMPUTATION (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Schedule of Details Supporting Computation of Earnings Per Share

Detail supporting the computation of basic and diluted earnings per common share was as follows for the years ended December 31, 2015, 2014 and 2013:

	2015		2014		2013
	(dollars in millions, except per common share results, number of shares/options in thousands)
Net income available for common stockholders	$	1,276	$	1,147	$	1,231
Weighted-average outstanding shares of common stock used to compute basic earnings per common share	149,455		154,187		157,503
Dilutive effect of:
Employee stock options	192		230		322
Restricted stock	1,495		1,457		1,326
Shares used to compute diluted earnings per common share	151,142		155,874		159,151
Basic earnings per common share	$	8.54	$	7.44	$	7.81
Diluted earnings per common share	$	8.44	$	7.36	$	7.73
Number of antidilutive stock options and restricted stock awards excluded from computation	415		320		704

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STOCKHOLDERS' EQUITY (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Schedule of Details of Dividend Payments

The following table provides details of dividend payments, excluding dividend equivalent rights, in 2013, 2014, and 2015 under our Board approved quarterly cash dividend policy:

Payment Date	Amount per Share	Total Amount
		(in millions)
2013	$1.06	$167
2014	$1.10	$170
2015	$1.14	$170

Class of Treasury Stock

Excluding shares acquired in connection with employee stock plans as well as 0.36 million shares received in March 2015 upon final settlement of our accelerated share repurchase agreement, or ASR Agreement, described below for which no cash was paid during the period, share repurchases were as follows during the years ended December 31, 2015, 2014 and 2013:

			Year Ended December 31,
			2015			2014				2013
Authorization Date	Purchase Not to Exceed		Shares	Cost		Shares	Cost			Shares	Cost
	(in millions)
September 2014	$	2,000	1.85	$	329	4.10	$	635	(a)	—	$	—
April 2014	1,000		—	—		1.50	184			—	—
April 2013	1,000		—	—		0.10	11			4.55	420
April 2012	1,000		—	—		—	—			1.22	82
Total repurchases			1.85	$	329	5.70	$	830		5.77	$	502

(a) Includes $100 millionheld back by Goldman Sachs pending final settlement of the ASR

Agreement in March 2015 at which time we received an additional 0.36 million shares which

are excluded from the table above.

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COMMITMENTS, GUARANTEES AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Rent Expense and Sublease Rental Income Associated With Operating Leases

Rent expense and sublease rental income, which are recorded net as an operating cost, for all operating leases were as follows for the years ended December 31, 2015, 2014 and 2013:

	2015			2014			2013
	(in millions)
Rent expense	$	201		$	226		$	227
Sublease rental income	(25		)	(14		)	(11		)
Net rent expense	$	176		$	212		$	216

Future Annual Minimum Payments Due

Future annual minimum payments due subsequent to December 31, 2015 under all of our noncancelable operating leases with initial terms in excess of one year are as follows:

	Minimum Lease Payments		Sublease Rental Receipts			Net  Lease Commitments
	(in millions)
For the years ending December 31,:
2016	$	173	$	(16	)	$	157
2017	159		(16		)	143
2018	127		(14		)	113
2019	94		(11		)	83
2020	54		(7		)	47
Thereafter	90		(45		)	45
Total	$	697	$	(109	)	$	588

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SEGMENT INFORMATION (Tables)

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, By Segment

Our segment results were as follows for the years ended December 31, 2015, 2014, and 2013:

	Retail		Group		Healthcare Services		Other Businesses		Eliminations/ Corporate			Consolidated
	(in millions)
2015
Revenues—external customers
Premiums:
Individual Medicare Advantage	$	29,526	$	—	$	—	$	—	$	—		$	29,526
Group Medicare Advantage	5,588		—		—		—		—			5,588
Medicare stand-alone PDP	3,846		—		—		—		—			3,846
Total Medicare	38,960		—		—		—		—			38,960
Fully-insured	4,243		5,493		—		—		—			9,736
Specialty	261		1,055		—		—		—			1,316
Medicaid and other	2,341		21		—		35		—			2,397
Total premiums	45,805		6,569		—		35		—			52,409
Services revenue:
Provider	—		40		655		—		—			695
ASO and other	9		658		—		14		—			681
Pharmacy	—		—		30		—		—			30
Total services revenue	9		698		685		14		—			1,406
Total revenues—external customers	45,814		7,267		685		49		—			53,815
Intersegment revenues
Services	—		93		17,997		—		(18,090		)	—
Products	—		—		4,923		—		(4,923		)	—
Total intersegment revenues	—		93		22,920		—		(23,013		)	—
Investment income	134		26		—		76		238			474
Total revenues	45,948		7,386		23,605		125		(22,775		)	54,289
Operating expenses:
Benefits	39,708		5,266		—		87		(792		)	44,269
Operating costs	5,118		1,769		22,481		14		(22,064		)	7,318
Depreciation and amortization	192		93		143		—		(73		)	355
Total operating expenses	45,018		7,128		22,624		101		(22,929		)	51,942
Income from operations	930		258		981		24		154			2,347
Gain on sale of business	—		—		—		—		270			270
Interest expense	—		—		—		—		186			186
Income before income taxes	$	930	$	258	$	981	$	24	$	238		$	2,431

Premium and services revenues derived from our contracts with the federal government, as a percentage of our total premium and services revenues, was approximately 73% for 2015, compared to 73% for 2014, and 75% for 2013.

Benefits expense for the Retail segment for 2015 includes $176 million for a provision for probable future losses (premium deficiency) for individual commercial medical business compliant with the Health Care Reform Law for the 2016 coverage year as discussed more fully in Note 7.

	Retail		Group		Healthcare Services		Other Businesses		Eliminations/ Corporate			Consolidated
	(in millions)
2014
Revenues—external customers
Premiums:
Individual Medicare Advantage	$	25,782	$	—	$	—	$	—	$	—		$	25,782
Group Medicare Advantage	5,490		—		—		—		—			5,490
Medicare stand-alone PDP	3,404		—		—		—		—			3,404
Total Medicare	34,676		—		—		—		—			34,676
Fully-insured	3,265		5,339		—		—		—			8,604
Specialty	256		1,098		—		—		—			1,354
Medicaid and other	1,255		19		—		51		—			1,325
Total premiums	39,452		6,456		—		51		—			45,959
Services revenue:
Provider	—		23		1,254		—		—			1,277
ASO and other	39		740		—		9		—			788
Pharmacy	—		—		99		—		—			99
Total services revenue	39		763		1,353		9		—			2,164
Total revenues—external customers	39,491		7,219		1,353		60		—			48,123
Intersegment revenues
Services	—		78		15,098		—		(15,176		)	—
Products	—		—		3,749		—		(3,749		)	—
Total intersegment revenues	—		78		18,847		—		(18,925		)	—
Investment income	97		23		—		60		197			377
Total revenues	39,588		7,320		20,200		120		(18,728		)	48,500
Operating expenses:
Benefits	33,508		5,130		—		102		(574		)	38,166
Operating costs	4,576		1,936		19,307		17		(18,197		)	7,639
Depreciation and amortization	165		103		155		—		(90		)	333
Total operating expenses	38,249		7,169		19,462		119		(18,861		)	46,138
Income from operations	1,339		151		738		1		133			2,362
Interest expense	—		—		—		—		192			192
Income (loss) before income taxes	$	1,339	$	151	$	738	$	1	$	(59	)	$	2,170

	Retail		Group		Healthcare Services		Other Businesses			Eliminations/ Corporate			Consolidated
	(in millions)
2013
Revenues—external customers
Premiums:
Individual Medicare Advantage	$	22,481	$	—	$	—	$	—		$	—		$	22,481
Group Medicare Advantage	4,710		—		—		—			—			4,710
Medicare stand-alone PDP	3,033		—		—		—			—			3,033
Total Medicare	30,224		—		—		—			—			30,224
Fully-insured	1,160		5,117		—		—			—			6,277
Specialty	210		1,095		—		—			—			1,305
Medicaid and other	328		25		—		670			—			1,023
Total premiums	31,922		6,237		—		670			—			38,829
Services revenue:
Provider	—		21		1,291		—			—			1,312
ASO and other	18		714		—		6			—			738
Pharmacy	—		—		59		—			—			59
Total services revenue	18		735		1,350		6			—			2,109
Total revenues—external customers	31,940		6,972		1,350		676			—			40,938
Intersegment revenues
Services	—		51		11,890		—			(11,941		)	—
Products	—		—		2,803		—			(2,803		)	—
Total intersegment revenues	—		51		14,693		—			(14,744		)	—
Investment income	92		24		—		59			200			375
Total revenues	32,032		7,047		16,043		735			(14,544		)	41,313
Operating expenses:
Benefits	27,164		4,847		—		962			(409		)	32,564
Operating costs	3,232		1,860		15,372		56			(14,165		)	6,355
Depreciation and amortization	146		100		151		6			(70		)	333
Total operating expenses	30,542		6,807		15,523		1,024			(14,644		)	39,252
Income (loss) from operations	1,490		240		520		(289		)	100			2,061
Interest expense	—		—		—		—			140			140
Income (loss) before income taxes	$	1,490	$	240	$	520	$	(289	)	$	(40	)	$	1,921

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EXPENSES ASSOCIATED WITH LONG-DURATION INSURANCE PRODUCTS (Tables)

12 Months Ended

Dec. 31, 2015

Insurance [Abstract]

Schedule of Deferred Acquisition Cost and Future Policy Benefits Payable With Our Long-Duration Insurance Products

The table below presents deferred acquisition costs and future policy benefits payable associated with our long-duration insurance products for the years ended December 31, 2015 and 2014.

	2015					2014
	Deferred acquisition costs		Future policy benefits payable			Deferred acquisition costs		Future policy benefits payable
	(in millions)
Other long-term assets	$	135	$	—		$	167	$	—
Trade accounts payable and accrued expenses	—		(64		)	—		(68		)
Long-term liabilities	—		(2,151		)	—		(2,349		)
Total asset (liability)	$	135	$	(2,215	)	$	167	$	(2,417	)

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REINSURANCE (Tables)

12 Months Ended

Dec. 31, 2015

Insurance [Abstract]

Balance and Financial Rating Related to Reinsurers

We evaluate the financial condition of these reinsurers on a regular basis. These reinsurers are well-known and well-established, as evidenced by the strong financial ratings at December 31, 2015 presented below:

Reinsurer	Total Recoverable		A.M. Best Rating at December 31, 2015
	(in millions)
Protective Life Insurance Company	$	184	A+ (superior)
Munich American Reassurance Company	155		A+ (superior
Employers Reassurance Corporation	91		A- (excellent)
General Re Life Corporation	90		A++ (superior)
All others	148		A+ to B++ (superior to good)
	$	668

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QUARTERLY FINANCIAL INFORMATION (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

A summary of our quarterly unaudited results of operations for the years ended December 31, 2015 and 2014 follows:

	2015
	First		Second		Third		Fourth (2)
	(in millions, except per share results)
Total revenues	$	13,833	$	13,732	$	13,363	$	13,361
Income before income taxes	744		793		648		246
Net income	430		431		314		101
Basic earnings per common share	$	2.86	$	2.88	$	2.11	$	0.68
Diluted earnings per common share (1)	$	2.82	$	2.85	$	2.09	$	0.67
	2014
	First		Second		Third		Fourth
	(in millions, except per share results)
Total revenues	$	11,712	$	12,222	$	12,238	$	12,328
Income before income taxes	686		646		551		287
Net income	368		344		290		145
Basic earnings per common share	$	2.37	$	2.22	$	1.87	$	0.96
Diluted earnings per common share (1)	$	2.35	$	2.19	$	1.85	$	0.94

(1) The calculation of diluted earnings per common share is based on the weighted average shares outstanding during each quarter and, accordingly, the sum may not equal the total for the year.

(2) The fourth quarter of 2015 includes an expense of $176 million ($112 million after tax, or $0.74 per diluted common share) for a premium deficiency reserve associated with our individual commercial medical policies compliant with the Health Care Reform Law associated with the 2016 coverage year.

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Reporting Entity - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015
FLORIDA
Entity Information [Line Items]
Percentage of premiums and services revenue related to contracts with CMS for Medicare Advantage members in Florida	14.00%

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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)		12 Months Ended
	Jul. 02, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Significant Accounting Policies [Line Items]
Maximum dividend allowed prior to merger	$ 0.29
Member co-share amounts and government subsidies		$ 12,300,000,000	$ 9,700,000,000	$ 7,300,000,000
Typical term (in years) of short-duration employer-group prepaid health services policies		1 year
Number of days notice for employer group to cancel short-duration prepaid health services policies		30 days
Consumer discounts on brand name prescription drugs		50.00%
Benefits expense		$ 44,269,000,000	38,166,000,000	32,564,000,000
Document Fiscal Year Focus		2015
New Tricare South Region Contract
Significant Accounting Policies [Line Items]
TRICARE Health care cost payments		$ 3,300,000,000	3,200,000	3,200,000,000
TRICARE Health care cost reimbursements		3,300,000,000	3,200,000,000	3,200,000
Difference between TRICARE health care costs payments and reimbursements		$ (4,000,000)		5,000,000
Equipment | Minimum
Significant Accounting Policies [Line Items]
Useful life		3 years
Equipment | Maximum
Significant Accounting Policies [Line Items]
Useful life		10 years
Computer Software | Minimum
Significant Accounting Policies [Line Items]
Useful life		3 years
Computer Software | Maximum
Significant Accounting Policies [Line Items]
Useful life		7 years
Building | Minimum
Significant Accounting Policies [Line Items]
Useful life		20 years
Building | Maximum
Significant Accounting Policies [Line Items]
Useful life		40 years
Commercial Medical
Significant Accounting Policies [Line Items]
Percentage of premiums and services revenue		18.00%
CMS Reinsurance Subsidies Or Discounts
Significant Accounting Policies [Line Items]
Subsidy and discount payments		$ 8,900,000,000	6,700,000,000	4,800,000,000
Subsidy and discount reimbursements		8,600,000,000	5,800,000,000	4,600,000,000
Subsidy and discount payments in excess of reimbursements		$ (361,000,000)	(945,000,000)	(154,000,000)
Settlement period after close		9 months
CMS Brand Name Prescription Drug Discounts [Member] | Minimum
Significant Accounting Policies [Line Items]
Settlement period after close		14 months
CMS Brand Name Prescription Drug Discounts [Member] | Maximum
Significant Accounting Policies [Line Items]
Settlement period after close		18 months
Agreement and Plan of Merger With Aetna Inc.
Significant Accounting Policies [Line Items]
Number of shares one share of common stock is converted into	0.8375
Cash received for each share converted	$ 125
Total transaction cost, including assumption of debt	$ 37,000,000,000
MCCI
Significant Accounting Policies [Line Items]
Related party receivable		$ 284,000,000
Interest rate on receivable		10.00%
Maximum borrowing capacity		$ 55,000,000
Advances to affiliate		9,000,000
Benefits expense		1,037,000,000	962,000,000	873,000,000
Health and Human Services | Reinsurance Contribution
Significant Accounting Policies [Line Items]
Member co-share amounts and government subsidies		478,000,000	281,000,000	0
Government and health plan member payments		(409,000,000)	(255,000,000)	0
Government and health plan member subsidies, amount in excess of payments		$ 69,000,000	$ 26,000,000	$ 0

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ACQUISITIONS AND DIVESTITURES - Additional Information (Detail) - USD ($) $ in Millions			12 Months Ended
	Jun. 01, 2015	Sep. 06, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Gain on sale of business			$ 270	$ 0	$ 0
Liabilities
Net assets disposed	$ 763			737
Goodwill			$ 3,265	3,231	3,253
Weighted Average Life			9 years 9 months 18 days
American Eldercare Inc.
Liabilities
Goodwill		$ 76
Other intangible assets acquired		$ 75
Weighted Average Life		9 years 3 months 18 days
Concentra Inc.
Business Acquisition [Line Items]
Selling price in cash	1,055
Disposal transaction costs	22
Assets
Receivables, net	130			115
Property and equipment, net	197			191
Goodwill	480			480
Other intangible assets, net	124			132
Other assets	27			25
Total assets disposed/held-for-sale	958			943
Liabilities
Trade accounts payable and accrued expenses	81			90
Other liabilities	114			116
Total liabilities disposed/held-for-sale	$ 195			206
Pre-tax earnings			$ 411	$ 998	$ 981

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Investment Securities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) position	Dec. 31, 2014 USD ($) position	Dec. 31, 2013 USD ($)
Investment [Line Items]
Percentage of debt securities considered to be of investment-grade	98.00%
Percentage of tax-exempt municipal securities classified as pre-refunded	7.00%
General obligation bonds as percentage of tax-exempt municipal securities that were not pre-refunded	42.00%
Special revenue bonds as percentage of tax exempt municipal securities that were not pre-refunded	58.00%
Maximum percentage of any general obligation bonds in one state	11.00%
Percentage of tax-exempt securities insured by bond insurers	6.00%
Residential and commercial mortgage-backed securities, percentage of collateral consisting of prime loans	99.00%
Percentage of corporate securities associated with financial services industry	25.00%	21.00%
Other-than-temporary impairments | $	$ 0	$ 0	$ 0
Number of positions | position	690	2,000
Residential Mortgage-backed securities
Investment [Line Items]
Mortgage back securities as percent of agency mortgage-backed securities	98.00%	99.00%

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Schedule of Investment Securities Classified as Current and Long-Term (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Amortized Cost	$ 9,018	$ 9,072
Gross Unrealized Gains	218	516
Gross Unrealized Losses	(126)	(41)
Total debt securities, Fair Value	9,110	9,547
Debt Securities | Tax-exempt municipal securities
Investment [Line Items]
Amortized Cost	2,611	2,931
Gross Unrealized Gains	61	140
Gross Unrealized Losses	(4)	(3)
Total debt securities, Fair Value	2,668	3,068
Debt Securities | Residential Mortgage-backed securities
Investment [Line Items]
Amortized Cost	13	17
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total debt securities, Fair Value	13	17
Debt Securities | Commercial Mortgage-backed securities
Investment [Line Items]
Amortized Cost	1,024	846
Gross Unrealized Gains	2	16
Gross Unrealized Losses	(41)	(19)
Total debt securities, Fair Value	985	843
Debt Securities | Asset-backed securities
Investment [Line Items]
Amortized Cost	264	28
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(2)	0
Total debt securities, Fair Value	263	29
Debt Securities | Corporate debt securities
Investment [Line Items]
Amortized Cost	2,873	3,432
Gross Unrealized Gains	140	299
Gross Unrealized Losses	(55)	(13)
Total debt securities, Fair Value	2,958	3,718
Debt Securities | U.S. Treasury And Other U.S. Government Corporations And Agencies | U.S. Treasury and agency obligations
Investment [Line Items]
Amortized Cost	331	365
Gross Unrealized Gains	2	10
Gross Unrealized Losses	(1)	(1)
Total debt securities, Fair Value	332	374
Debt Securities | U.S. Treasury And Other U.S. Government Corporations And Agencies | Mortgage-backed securities
Investment [Line Items]
Amortized Cost	1,902	1,453
Gross Unrealized Gains	12	50
Gross Unrealized Losses	(23)	(5)
Total debt securities, Fair Value	$ 1,891	$ 1,498

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Schedule of Gross Unrealized Losses and Fair Values of Securities (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Less than 12 months, Fair Value	$ 4,326	$ 496
Less than 12 months, Gross Unrealized Losses	(84)	(8)
12 months or more, Fair Value	484	917
12 months or more, Gross Unrealized Losses	(42)	(33)
Total, Fair Value	4,810	1,413
Total, Gross Unrealized Losses	(126)	(41)
Debt Securities | Tax-exempt municipal securities
Investment [Line Items]
Less than 12 months, Fair Value	843	131
Less than 12 months, Gross Unrealized Losses	(3)	(1)
12 months or more, Fair Value	52	118
12 months or more, Gross Unrealized Losses	(1)	(2)
Total, Fair Value	895	249
Total, Gross Unrealized Losses	(4)	(3)
Debt Securities | Residential Mortgage-backed securities
Investment [Line Items]
Less than 12 months, Fair Value	2	1
Less than 12 months, Gross Unrealized Losses	0	0
12 months or more, Fair Value	4	4
12 months or more, Gross Unrealized Losses	0	0
Total, Fair Value	6	5
Total, Gross Unrealized Losses	0	0
Debt Securities | Commercial Mortgage-backed securities
Investment [Line Items]
Less than 12 months, Fair Value	626	31
Less than 12 months, Gross Unrealized Losses	(13)	(1)
12 months or more, Fair Value	265	267
12 months or more, Gross Unrealized Losses	(28)	(18)
Total, Fair Value	891	298
Total, Gross Unrealized Losses	(41)	(19)
Debt Securities | Asset-backed securities
Investment [Line Items]
Less than 12 months, Fair Value	258	13
Less than 12 months, Gross Unrealized Losses	(2)	0
12 months or more, Fair Value	0	0
12 months or more, Gross Unrealized Losses	0	0
Total, Fair Value	258	13
Total, Gross Unrealized Losses	(2)	0
Debt Securities | Corporate debt securities
Investment [Line Items]
Less than 12 months, Fair Value	918	219
Less than 12 months, Gross Unrealized Losses	(45)	(6)
12 months or more, Fair Value	63	128
12 months or more, Gross Unrealized Losses	(10)	(7)
Total, Fair Value	981	347
Total, Gross Unrealized Losses	(55)	(13)
Debt Securities | U.S. Treasury And Other U.S. Government Corporations And Agencies | U.S. Treasury and agency obligations
Investment [Line Items]
Less than 12 months, Fair Value	195	79
Less than 12 months, Gross Unrealized Losses	(1)	0
12 months or more, Fair Value	14	80
12 months or more, Gross Unrealized Losses	0	(1)
Total, Fair Value	209	159
Total, Gross Unrealized Losses	(1)	(1)
Debt Securities | U.S. Treasury And Other U.S. Government Corporations And Agencies | Mortgage-backed securities
Investment [Line Items]
Less than 12 months, Fair Value	1,484	22
Less than 12 months, Gross Unrealized Losses	(20)	0
12 months or more, Fair Value	86	320
12 months or more, Gross Unrealized Losses	(3)	(5)
Total, Fair Value	1,570	342
Total, Gross Unrealized Losses	$ (23)	$ (5)

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Schedule of Realized Gains (Losses) Related to Investment Securities Included Within Investment Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 179	$ 29	$ 33
Gross realized losses	(33)	(9)	(11)
Net realized capital gains	$ 146	$ 20	$ 22

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Schedule of Contractual Maturities of Debt Securities Available for Sale (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Due within one year, Amortized Cost	$ 438
Due after one year through five years, Amortized Cost	1,829
Due after five years through ten years, Amortized Cost	1,244
Due after ten years, Amortized Cost	2,304
Mortgage and asset-backed securities, Amortized Cost	3,203
Amortized Cost	9,018	$ 9,072
Due within one year, Fair Value	439
Due after one year through five years, Fair Value	1,871
Due after five years through ten years, Fair Value	1,264
Due after ten years, Fair Value	2,384
Mortgage and asset-backed securities, Fair Value	3,152
Total debt securities, Fair Value	$ 9,110	$ 9,547

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Fair Value - Additional Information (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Transfers between Level 1 and Level 2	$ 0	$ 0
Level 3 assets fair value	$ 11,000,000	32,000,000	$ 37,000,000	$ 38,000,000
Upper limit percentage of Level 3 assets to total invested assets	0.10%
Long-term debt, carrying value	$ 3,821,000,000	3,825,000,000
Long-term debt, fair value	$ 3,986,000,000	$ 4,102,000,000

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Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	$ 9,110	$ 9,547
Measured on Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, Fair Value	2,229	1,712
Total debt securities, Fair Value	9,110	9,547
Total invested assets	11,339	11,259
Measured on Recurring Basis | Tax-exempt municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	2,668	3,068
Measured on Recurring Basis | Residential Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	13	17
Measured on Recurring Basis | Commercial Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	985	843
Measured on Recurring Basis | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	263	29
Measured on Recurring Basis | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	2,958	3,718
Measured on Recurring Basis | U.S. Treasury And Other U.S. Government Corporations And Agencies | U.S. Treasury and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	332	374
Measured on Recurring Basis | U.S. Treasury And Other U.S. Government Corporations And Agencies | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	1,891	1,498
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, Fair Value	2,229	1,712
Total debt securities, Fair Value	0	0
Total invested assets	2,229	1,712
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis | Tax-exempt municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	0	0
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis | Residential Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	0	0
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis | Commercial Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	0	0
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	0	0
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	0	0
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis | U.S. Treasury And Other U.S. Government Corporations And Agencies | U.S. Treasury and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	0	0
Quoted Prices in Active Markets (Level 1) | Measured on Recurring Basis | U.S. Treasury And Other U.S. Government Corporations And Agencies | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	0	0
Other Observable Inputs (Level 2) | Measured on Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, Fair Value	0	0
Total debt securities, Fair Value	9,099	9,515
Total invested assets	9,099	9,515
Other Observable Inputs (Level 2) | Measured on Recurring Basis | Tax-exempt municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	2,663	3,060
Other Observable Inputs (Level 2) | Measured on Recurring Basis | Residential Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	13	17
Other Observable Inputs (Level 2) | Measured on Recurring Basis | Commercial Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	985	843
Other Observable Inputs (Level 2) | Measured on Recurring Basis | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	263	28
Other Observable Inputs (Level 2) | Measured on Recurring Basis | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	2,952	3,695
Other Observable Inputs (Level 2) | Measured on Recurring Basis | U.S. Treasury And Other U.S. Government Corporations And Agencies | U.S. Treasury and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	332	374
Other Observable Inputs (Level 2) | Measured on Recurring Basis | U.S. Treasury And Other U.S. Government Corporations And Agencies | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	1,891	1,498
Unobservable Inputs (Level 3) | Measured on Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, Fair Value	0	0
Total debt securities, Fair Value	11	32
Total invested assets	11	32
Unobservable Inputs (Level 3) | Measured on Recurring Basis | Tax-exempt municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	5	8
Unobservable Inputs (Level 3) | Measured on Recurring Basis | Residential Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	0	0
Unobservable Inputs (Level 3) | Measured on Recurring Basis | Commercial Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	0	0
Unobservable Inputs (Level 3) | Measured on Recurring Basis | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	0	1
Unobservable Inputs (Level 3) | Measured on Recurring Basis | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	6	23
Unobservable Inputs (Level 3) | Measured on Recurring Basis | U.S. Treasury And Other U.S. Government Corporations And Agencies | U.S. Treasury and agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	0	0
Unobservable Inputs (Level 3) | Measured on Recurring Basis | U.S. Treasury And Other U.S. Government Corporations And Agencies | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt securities, Fair Value	$ 0	$ 0

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Changes in Fair Value of Assets Measured Using Significant Unobservable Inputs (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 32	$ 37	$ 38
Realized in earnings	(1)	0	0
Unrealized in other comprehensive income	0	0	0
Purchases	0	0	0
Sales	(20)	(5)	0
Settlements	0	0	(1)
Ending balance	11	32	37
Private Placements
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	24	24	25
Realized in earnings	(1)	0	0
Unrealized in other comprehensive income	0	0	0
Purchases	0	0	0
Sales	(17)	0	0
Settlements	0	0	(1)
Ending balance	6	24	24
Auction Rate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	8	13	13
Realized in earnings	0	0	0
Unrealized in other comprehensive income	0	0	0
Purchases	0	0	0
Sales	(3)	(5)	0
Settlements	0	0	0
Ending balance	$ 5	$ 8	$ 13

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Balance Sheet Amounts Associated With Medicare Part D (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Other current assets	$ 4,712	$ 4,007
Trade accounts payable and accrued expenses	(2,212)	(2,095)
Risk Corridor Settlement
Segment Reporting Information [Line Items]
Other current assets	25	105
Trade accounts payable and accrued expenses	(47)	(36)
Total net (liability) asset	(22)	69
CMS Subsidies/ Discounts
Segment Reporting Information [Line Items]
Other current assets	2,082	1,690
Trade accounts payable and accrued expenses	(63)	(32)
Total net (liability) asset	$ 2,019	$ 1,658

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HEALTH CARE REFORM (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Oct. 01, 2015
Supplementary Insurance Information, by Segment [Line Items]
Provision for premium deficiency		$ 176	$ 176	$ 0	$ 0
Future policy benefits payable		2,151	2,151	2,349
Other current assets		4,712	4,712	4,007
Trade accounts payable and accrued expenses		(2,212)	(2,212)	(2,095)
Other long-term assets		2,502	2,502	1,583
Other long-term liabilities		(235)	(235)	(236)
Risk Adjustment Settlement
Supplementary Insurance Information, by Segment [Line Items]
Total net (liability) asset		(87)	(87)	42
Reinsurance Recoverables
Supplementary Insurance Information, by Segment [Line Items]
Total net (liability) asset		610	610	586
Risk Corridor Settlement
Supplementary Insurance Information, by Segment [Line Items]
Total net (liability) asset		459	459	51
2014 Coverage Year
Supplementary Insurance Information, by Segment [Line Items]
Risk adjustment charges			(186)
Payment for risk corridor charges			(1)
Proceeds from reinsurance recoverable			521
Proceeds from risk corridor settlements			26
2014 Coverage Year | Risk Adjustment Settlement
Supplementary Insurance Information, by Segment [Line Items]
Proceeds from legal settlements			57
Premiums receivable		4	4	131
Other current assets		0	0	0
Trade accounts payable and accrued expenses		0	0	(89)
Net current (liability) asset		4	4	42
Other long-term assets		0	0	0
Other long-term liabilities		0	0	0
Net long-term asset		0	0	0
Total net (liability) asset		4	4	42
2014 Coverage Year | Reinsurance Recoverables
Supplementary Insurance Information, by Segment [Line Items]
Premiums receivable		0	0	0
Other current assets		0	0	586
Trade accounts payable and accrued expenses		0	0	0
Net current (liability) asset		0	0	586
Other long-term assets		0	0	0
Other long-term liabilities		0	0	0
Net long-term asset		0	0	0
Total net (liability) asset		0	0	586
2014 Coverage Year | Risk Corridor Settlement
Supplementary Insurance Information, by Segment [Line Items]
Premiums receivable to be paid by CMS, percent (to be paid between December 2015 and January 2016)						12.60%
Premiums receivable		0	0	0
Other current assets		0	0	55
Trade accounts payable and accrued expenses		0	0	(4)
Net current (liability) asset		0	0	51
Other long-term assets		215	215	0
Other long-term liabilities		0	0	0
Net long-term asset		215	215	0
Total net (liability) asset		215	215	51
2015 Coverage Year | Risk Adjustment Settlement
Supplementary Insurance Information, by Segment [Line Items]
Premiums receivable		122	122	0
Other current assets		0	0	0
Trade accounts payable and accrued expenses		(223)	(223)	0
Net current (liability) asset		(101)	(101)	0
Other long-term assets		10	10	0
Other long-term liabilities		0	0	0
Net long-term asset		10	10	0
Total net (liability) asset		(91)	(91)	0
2015 Coverage Year | Reinsurance Recoverables
Supplementary Insurance Information, by Segment [Line Items]
Premiums receivable		0	0	0
Other current assets		610	610	0
Trade accounts payable and accrued expenses		0	0	0
Net current (liability) asset		610	610	0
Other long-term assets		0	0	0
Other long-term liabilities		0	0	0
Net long-term asset		0	0	0
Total net (liability) asset		610	610	0
2015 Coverage Year | Risk Corridor Settlement
Supplementary Insurance Information, by Segment [Line Items]
Premiums receivable		0	0	0
Other current assets		0	0	0
Trade accounts payable and accrued expenses		0	0	0
Net current (liability) asset		0	0	0
Other long-term assets		244	244	0
Other long-term liabilities		0	0	0
Net long-term asset		244	244	0
Total net (liability) asset		244	244	0
2016 Coverage Year
Supplementary Insurance Information, by Segment [Line Items]
Provision for premium deficiency		176
Future policy benefits payable		$ 340	340
Health Care Reform
Supplementary Insurance Information, by Segment [Line Items]
Decline in the estimated net receivable			$ (43)
Payment of annual health insurance industry fee	$ 867			$ 562

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Property and Equipment, Net (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Land	$ 20	$ 18
Buildings and leasehold improvements	633	602
Equipment	645	631
Computer software	1,424	1,656
Property, Plant and Equipment, Gross, Total	2,722	2,907
Accumulated depreciation	(1,338)	(1,679)
Property and equipment, net	$ 1,384	$ 1,228

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Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 01, 2015
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 354	$ 328	$ 309
Capitalized internally developed and purchased software amortization	$ 220	191	$ 172
Concentra Inc.
Property, Plant and Equipment [Line Items]
Property and equipment classified as held-for-sale		$ 191		$ 197

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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill reclassified to assets held-for-sale	$ 1	$ 40
Amortization expense for other intangible assets	93	$ 121	$ 117
Concentra Inc.
Goodwill [Line Items]
Goodwill reclassified to assets held-for-sale	$ 480

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Changes in Carrying Amount of Goodwill by Reportable Segments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Beginning balance	$ 3,231	$ 3,253
Acquisitions	35	19
Dispositions	(1)	(40)
Subsequent payments/adjustments		(1)
Ending balance	3,265	3,231
Retail
Goodwill [Roll Forward]
Beginning balance	1,069	1,069
Acquisitions	0	0
Dispositions	0	0
Subsequent payments/adjustments		0
Ending balance	1,069	1,069
Group
Goodwill [Roll Forward]
Beginning balance	385	385
Acquisitions	0	0
Dispositions	0	0
Subsequent payments/adjustments		0
Ending balance	385	385
Healthcare Services
Goodwill [Roll Forward]
Beginning balance	1,777	1,799
Acquisitions	35	19
Dispositions	(1)	(40)
Subsequent payments/adjustments		(1)
Ending balance	$ 1,811	$ 1,777

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Details of Intangible Assets Included in Other Long-Term Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Life	9 years 9 months 18 days
Cost	$ 753	$ 865
Accumulated Amortization	396	425
Net	$ 357	440
Customer contracts/relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Life	9 years 9 months 18 days
Cost	$ 566	657
Accumulated Amortization	292	326
Net	$ 274	331
Trade names and technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Life	8 years 3 months 18 days
Cost	$ 104	115
Accumulated Amortization	54	50
Net	$ 50	65
Provider contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Life	14 years 7 months 6 days
Cost	$ 51	52
Accumulated Amortization	24	21
Net	$ 27	31
Noncompetes and other
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Life	8 years 2 months 12 days
Cost	$ 32	41
Accumulated Amortization	26	28
Net	$ 6	$ 13

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Schedule of Estimated Amortization Expense (Detail) $ in Millions	Dec. 31, 2015 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2016	$ 78
2017	71
2018	62
2019	51
2020	$ 47

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Benefits Payable - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Favorable medical claims reserve development related to prior fiscal years	$ 236	$ 518	$ 474

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Activity in Benefits Payable (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Balances at January 1		$ 4,475	$ 3,893	$ 3,775
Less: Reinsurance recoverables	$ (85)	(85)	(78)	0	$ 0
Balances at January 1, net			4,397	3,893	3,775
Acquisitions		0	0	5
Current year, Incurred		44,397	38,641	32,711
Prior years, Incurred		(236)	(518)	(474)
Total incurred		44,161	38,123	32,237
Current year, Paid		(39,802)	(34,357)	(29,103)
Prior years, Paid		(4,041)	(3,262)	(3,021)
Total paid		(43,843)	(37,619)	(32,124)
Provision for premium deficiency	176	176	0	0
Reinsurance recoverable	(85)	(85)	(78)	0	$ 0
Balances at December 31	$ 4,976	$ 4,976	$ 4,475	$ 3,893

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Benefit Expenses Excluded From Activity in Benefits Payable (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Premium deficiency reserve for short-duration policies	$ 176	$ 176	$ 0	$ 0
Military services		12	11	(27)
Future policy benefits		(80)	32	354
Total		$ 108	$ 43	$ 327

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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Nondeductible executive compensation	$ 18,000,000	$ 22,000,000	$ 6,000,000
Limitations on deductibility of excess annual employee compensation as mandated by health insurance reforms	500,000	500,000	$ 500,000
Net operating losses to carryforward related to prior acquisitions	126,000,000
Valuation allowances on net operating loss carryforwards related to prior acquisitions	105,000,000
Unrecognized deferred tax liabilities	30,000,000
PUERTO RICO
Operating Loss Carryforwards [Line Items]
Valuation allowances on net operating loss carryforwards related to prior acquisitions	$ 7,000,000
Adjustments for New Accounting Principle, Early Adoption
Operating Loss Carryforwards [Line Items]
Decrease in other current assets, if retroactively adjusted		(79,000,000)
Increase in other long-term assets, if retroactively adjusted		$ 79,000,000

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Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Federal	$ 1,067	$ 1,006	$ 595
States and Puerto Rico	90	81	53
Total current provision	1,157	1,087	648
Deferred (benefit) provision	(2)	(64)	42
Provision for income taxes	$ 1,155	$ 1,023	$ 690

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Provision for Income Taxes Using Federal Statutory Rate (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income tax provision at federal statutory rate	$ 851	$ 759	$ 672
States, net of federal benefit, and Puerto Rico	44	48	32
Tax exempt investment income	(24)	(27)	(26)
Health insurer fee	314	204	0
Nondeductible executive compensation	18	22	6
Concentra sale	(67)	0	0
Other, net	19	17	6
Provision for income taxes	$ 1,155	$ 1,023	$ 690

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Principal Components of Net Deferred Tax Balances (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Future policy benefits payable	$ 200	$ 320
Compensation and other accrued expenses	130	168
Benefits payable	267	138
Net operating loss carryforward	47	52
Deferred acquisition costs	64	57
Unearned revenues	22	21
Other	13	17
Total deferred income tax assets	743	773
Valuation allowance	(42)	(48)
Total deferred income tax assets, net of valuation allowance	701	725
Depreciable property and intangible assets	(363)	(346)
Investment securities	(37)	(168)
Prepaid expenses	(45)	(55)
Total deferred income tax liabilities	(445)	(569)
Total net deferred income tax assets	256	156
Other current assets	0	79
Other long-term assets	256	77
Total net deferred income tax assets	$ 256	$ 156

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Debt - Additional Information (Detail)	1 Months Ended			12 Months Ended
	Oct. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jul. 31, 2013 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Debt Instrument [Line Items]
Percentage of senior notes principal amount which may be redeemed at our option				100.00%
Minimum level of net worth required				$ 8,500,000,000
Actual net worth				10,346,000,000	$ 9,646,000,000		$ 9,316,000,000	$ 8,847,000,000
Uncommitted incremental loan facility				$ 250,000,000
Line of credit facility, covenant terms				The terms of the credit agreement include standard provisions related to conditions of borrowing, including a customary material adverse effect clause which could limit our ability to borrow additional funds. In addition, the credit agreement contains customary restrictive and financial covenants as well as customary events of default, including financial covenants regarding the maintenance of a minimum level of net worth of $7.8 billion at December 31, 2014 and a maximum leverage ratio of 3.0:1. We are in compliance with the financial covenants, with actual net worth of $9.6 billion and actual leverage ratio of 1.4:1, as measured in accordance with the credit agreement as of December 31, 2014.
Borrowings outstanding under credit agreement				$ 0
Outstanding letters of credit				1,000,000
Remaining borrowing capacity				999,000,000
Prior Credit Agreement
Debt Instrument [Line Items]
Revolving credit agreement term, in years			5 years
Maximum borrowing capacity			$ 1,000,000,000.0
Senior Notes
Debt Instrument [Line Items]
Net proceeds from debt		$ 1,730,000,000
Reduction in unamortized value adjustment of senior notes				$ 28,000,000	32,000,000	$ 103,000,000
Senior Notes | $500 million, 6.45% due June 1, 2016
Debt Instrument [Line Items]
Debt redemption price, percentage	100.00%
Early redemption of debt, amount	$ 560,000,000
Gain (loss) on extinguishment of debt	(37,000,000)
Senior notes					$ 500,000,000
Debt instrument, stated interest rate					6.45%
Reduction in unamortized value adjustment of senior notes	$ 12,000,000
Revolving Credit Facility | Line of Credit | Credit Agreement
Debt Instrument [Line Items]
Maximum leverage ratios for new credit agreement				3.0
Actual net worth				$ 10,346,000,000
Actual leverage ratio				1.3
Revolving Credit Facility | Line of Credit | LIBOR | Credit Agreement
Debt Instrument [Line Items]
Basis points spread over LIBOR				1.10%
Facility fee that is dependent upon credit rating, basis points				0.15%
Revolving Credit Facility | Line of Credit | LIBOR | Credit Agreement | Minimum
Debt Instrument [Line Items]
Basis points spread over LIBOR				0.90%
Facility fee that is dependent upon credit rating, basis points				0.10%
Revolving Credit Facility | Line of Credit | LIBOR | Credit Agreement | Maximum
Debt Instrument [Line Items]
Basis points spread over LIBOR				1.50%
Facility fee that is dependent upon credit rating, basis points				25.00%

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Carrying Value of Long-Term Debt of Outstanding (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Short-term borrowings	$ 299,000,000	$ 0
Senior Notes
Debt Instrument [Line Items]
Long-term debt	3,821,000,000	3,825,000,000
$500 million, 6.45% due June 1, 2016 | Senior Notes
Debt Instrument [Line Items]
Senior notes		$ 500,000,000
Debt instrument, stated interest rate		6.45%
$500 million, 7.20% due June 15, 2018 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	503,000,000	$ 504,000,000
Senior notes	$ 500,000,000	$ 500,000,000
Debt instrument, stated interest rate	7.20%	7.20%
$300 million, 6.30% due August 1, 2018 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 309,000,000	$ 312,000,000
Senior notes	$ 300,000,000	$ 300,000,000
Debt instrument, stated interest rate	6.30%	6.30%
$400 million, 2.625% due October 1, 2019 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 400,000,000	$ 400,000,000
Senior notes	$ 400,000,000	$ 400,000,000
Debt instrument, stated interest rate	2.65%	2.65%
$600 million, 3.15% due December 1, 2022 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 598,000,000	$ 598,000,000
Senior notes	$ 600,000,000	$ 600,000,000
Debt instrument, stated interest rate	3.15%	3.15%
$600 million, 3.85% due October 1, 2024 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 599,000,000	$ 599,000,000
Senior notes	$ 600,000,000	$ 600,000,000
Debt instrument, stated interest rate	3.85%	3.85%
$250 million, 8.15% due June 15, 2038 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 266,000,000	$ 266,000,000
Senior notes	$ 250,000,000	$ 250,000,000
Debt instrument, stated interest rate	8.15%	8.15%
$400 million, 4.625% due December 1, 2042 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 400,000,000	$ 400,000,000
Senior notes	$ 400,000,000	$ 400,000,000
Debt instrument, stated interest rate	4.625%	4.625%
$750 million, 4.95% due October 1, 2044 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 746,000,000	$ 746,000,000
Senior notes	$ 750,000,000	$ 750,000,000
Debt instrument, stated interest rate	4.95%	4.95%
Commercial Paper
Debt Instrument [Line Items]
Short-term borrowings	$ 299,000,000	$ 0

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DEBT - Commercial Paper (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Oct. 31, 2014
Short-term Debt [Line Items]
Short-term borrowings	$ 299,000,000	$ 0
Commercial Paper
Short-term Debt [Line Items]
Maximum borrowing capacity			$ 1,000,000,000
Maximum amount outstanding during period	414,000,000
Short-term borrowings	$ 299,000,000	$ 0

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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee retirement and savings plan cost	$ 188,000,000	$ 176,000,000	$ 155,000,000
Closing stock price as of December 31, 2014	$ 178.51
Percentage of retirement and savings plan's assets invested in our company common stock	13.00%
Shares of retirement and savings plans invested in company's common stock	2.5
Percentage of the retirement and savings plan's assets invested in our common stock as compared to company's outstanding shares at year-end	2.00%
Number of shares of our common stock reserved for issuance under our defined contribution retirement savings plans	3.4
Combination of age and years necessary for retirement provision as related to our equity award program	65 years
Minimum age required for retirement eligibility as related to our equity award program	55 years
Minimum number of years of service for retirement eligibility as related to our equity award program	5 years
Limitations on deductibility of excess annual employee compensation as mandated by health insurance reforms	$ 500,000	500,000	500,000
Employee service share based compensation tax benefit realized from exercise of stock options and restricted stock vesting	$ 34,000,000	30,000,000	20,000,000
Common stock shares reserved for stock award plans	18.1
Fair value of shares vested	$ 153,000,000	99,000,000	52,000,000
Outstanding intrinsic value of stock options	$ 48,000,000
Weighted-average remaining contractual term, years	5 years
Exercisable stock options intrinsic value	$ 20,000,000
Exercisable stock options weighted-average remaining contractual term, years	3 years 6 months
Total intrinsic value of stock options exercised	$ 28,000,000	32,000,000	39,000,000
Cash received from stock options exercises	$ 23,000,000	$ 52,000,000	$ 67,000,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of restricted stock awards	$ 165.26	$ 103.57	$ 73.50
Award vesting period	3 years
Total compensation expense not yet recognized related to nonvested restricted stock	$ 88,000,000
Compensation expense over a weighted-average period, years	1 year 4 months 24 days
Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense not yet recognized related to nonvested restricted stock	$ 10,000,000
Compensation expense over a weighted-average period, years	1 year 10 months 24 days
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of year for stock options to vest	1 year
Number of years for stock options to expire	7 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of year for stock options to vest	3 years
2011 Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares available for future grants if all grants are options	3.8
2011 Plan | Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares available for future grants if all grants are options	8.7

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Stock-Based Compensation Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Restricted stock awards, expense	$ 99	$ 91	$ 84
Stock options, expense	10	7	8
Total stock-based compensation expense	109	98	92
Tax benefit recognized	(26)	(22)	(22)
Stock-based compensation expense, net of tax	$ 83	$ 76	$ 70

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Weighted-Average Grant Date Fair Value of Restricted Stock Awards (Detail) - Restricted Stock - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Shares
Nonvested restricted stock, Shares, beginning balance	3,635
Nonvested restricted stock, Shares Granted	837
Nonvested restricted stock, Shares Vested	(919)
Nonvested restricted stock, Shares Forfeited	(188)
Nonvested restricted stock, Shares, ending balance	3,365	3,635
Weighted-Average Grant-Date Fair Value
Nonvested restricted stock, Weighted-Average Grant-Date Fair Value, Beginning Balance	$ 85.52
Nonvested restricted stock, Weighted-Average Grant-Date Fair Value, Granted	165.26	$ 103.57	$ 73.50
Nonvested restricted stock, Weighted-Average Grant-Date Fair Value, Vested	84.95
Nonvested restricted stock, Weighted-Average Grant-Date Fair Value, Forfeited	98.92
Nonvested restricted stock, Weighted-Average Grant-Date Fair Value, Ending Balance	$ 104.58	$ 85.52
Percent of stock with performance-based conditions	30.00%

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Weighted-Average Fair Value of Stock Options (Detail) - Employee Stock Options - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value at grant date	$ 36.91	$ 22.45	$ 21.80
Expected option life (years)	4 years 2 months 1 day	4 years 3 months 18 days	4 years 4 months 24 days
Expected volatility	27.40%	27.60%	38.80%
Risk-free interest rate at grant date	1.40%	1.30%	0.80%
Dividend yield	0.70%	1.10%	1.50%

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Activity for Option Plans (Detail) shares in Thousands	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Shares Under Option
Shares Under Options outstanding, beginning balance | shares	768
Shares Under Option, Granted | shares	377
Shares Under Option, Exercised | shares	(304)
Shares Under Option, Forfeited | shares	(6)
Shares Under Options outstanding, ending balance | shares	835
Shares Under Options, Options exercisable, ending balance | shares	203
Weighted-Average Exercise Price
Weighted-Average Exercise Price of Options outstanding, beginning balance | $ / shares	$ 82.45
Weighted-Average Exercise Price, Granted | $ / shares	164.80
Weighted-Average Exercise Price, Exercised | $ / shares	76.25
Weighted-Average Exercise Price, Forfeited | $ / shares	83.58
Weighted-Average Exercise Price of Options outstanding, ending balance | $ / shares	121.89
Weighted-Average Exercise Price, Options exercisable, ending balance | $ / shares	$ 78.30

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Schedule of Details Supporting Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income available for common stockholders	$ 101	$ 314	$ 431	$ 430	$ 145	$ 290	$ 344	$ 368	$ 1,276	$ 1,147	$ 1,231
Weighted-average outstanding shares of common stock used to compute basic earnings per common share									149,455	154,187	157,503
Shares used to compute diluted earnings per common share									151,142	155,874	159,151
Basic earnings per common share (in dollars per share)	$ 0.68	$ 2.11	$ 2.88	$ 2.86	$ 0.96	$ 1.87	$ 2.22	$ 2.37	$ 8.54	$ 7.44	$ 7.81
Diluted earnings per common share (in dollars per share)	$ 0.67	$ 2.09	$ 2.85	$ 2.82	$ 0.94	$ 1.85	$ 2.19	$ 2.35	$ 8.44	$ 7.36	$ 7.73
Number of antidilutive stock options and restricted stock awards excluded from computation									415	320	704
Employee stock options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of employee stock options and restricted stock									192	230	322
Restricted stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of employee stock options and restricted stock									1,495	1,457	1,326

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Schedule of Details of Dividend Payments (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Amount per Share	$ 1.14	$ 1.10	$ 1.06
Total Amount	$ 170	$ 170	$ 167

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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands				1 Months Ended	5 Months Ended	12 Months Ended
	Oct. 29, 2015	Mar. 13, 2015	Nov. 10, 2014	Oct. 31, 2013	Mar. 13, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jul. 03, 2015	Nov. 07, 2014	Sep. 30, 2014
Equity, Class of Treasury Stock [Line Items]
Cash dividend declared						$ 1.15	$ 1.11	$ 1.07
Total Amount						$ 170,000,000	$ 170,000,000	$ 167,000,000
Value of shares repurchased						$ 385,000,000	$ 872,000,000	$ 531,000,000
Common shares acquired in connection with employee stock plans, shares						300	400	300
Common shares acquired in connection with employee stock plans, amount						$ 56,000,000	$ 42,000,000	$ 29,000,000
Aggregate statutory capital and surplus in our state regulated insurance subsidiaries						6,600,000,000	6,000,000,000
Aggregate minimum regulatory requirements of statutory capital and surplus						4,600,000,000	$ 4,100,000,000
Dividends that may be paid to the parent company without prior approval by state regulatory authorities in 2014						900,000,000
Dividends that were paid to the parent company without prior approval by state regulatory authorities						$ 493,000,000
Dividend Declared
Equity, Class of Treasury Stock [Line Items]
Cash dividend declared	$ 0.29
Dividend payable date				Jan. 29, 2016
Record Date				Dec. 30, 2015
Total Amount	$ 43,000,000
Prior Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization											$ 1,000,000,000
Remaining authorized amount											816,000,000
Current Authorization
Equity, Class of Treasury Stock [Line Items]
Expiration date of current authorization						Dec. 31, 2016
Share repurchase authorization											$ 2,000,000,000
Accelerated Share Repurchase Agreement
Equity, Class of Treasury Stock [Line Items]
ASR, settlement receipt, shares		360
ASR final price paid per share					$ 146.21
Share repurchase authorization										$ 500,000,000
Shares repurchased in open market			3,060		3,420
Value of shares repurchased			$ 400,000,000
Decrease in capital in excess of par value			$ 100,000,000
September 2014 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization						$ 2,000,000,000
Shares repurchased in open market						1,850	4,100	0
Value of shares repurchased						$ 329,000,000	$ 635,000,000	$ 0
Remaining authorized amount									$ 1,040,000,000
April 2014 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization						$ 1,000,000,000
Shares repurchased in open market						0	1,500	0
Value of shares repurchased						$ 0	$ 184,000,000	$ 0
April 2013 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization						$ 1,000,000,000
Shares repurchased in open market						0	100	4,550
Value of shares repurchased						$ 0	$ 11,000,000	$ 420,000,000
April 2012 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization						$ 1,000,000,000
Shares repurchased in open market						0	0	1,220
Value of shares repurchased						$ 0	$ 0	$ 82,000,000
Excluding Employee Stock Plans and ASR
Equity, Class of Treasury Stock [Line Items]
Shares repurchased in open market						1,850	5,700	5,770
Value of shares repurchased						$ 329,000,000	$ 830,000,000	$ 502,000,000

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Commitments, Guarantees and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Purchase obligations in 2016	$ 74
Purchase obligations in 2017	44
Purchase obligations in 2018	30
Purchase obligations in 2019	1
Purchase obligations thereafter	$ 1
New Tricare South Region Contract
Loss Contingencies [Line Items]
Contract term years	5 years
Total Medicare
Loss Contingencies [Line Items]
Percentage of premiums and services revenue	72.00%
Military services
Loss Contingencies [Line Items]
Percentage of premiums and services revenue	1.00%
Medicaid
Loss Contingencies [Line Items]
Percentage of premiums and services revenue	4.00%

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Rent Expense and Sublease Rental Income Associated With Operating Leases (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 201	$ 226	$ 227
Sublease rental income	(25)	(14)	(11)
Net rent expense	$ 176	$ 212	$ 216

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Future Annual Minimum Payments Due (Detail) $ in Millions	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Minimum Lease Payments, 2016	$ 173
Minimum Lease Payments, 2017	159
Minimum Lease Payments, 2018	127
Minimum Lease Payments, 2019	94
Minimum Lease Payments, 2020	54
Minimum Lease Payments, Thereafter	90
Minimum Lease Payments, Total	697
Sublease Rental Receipts, 2016	(16)
Sublease Rental Receipts, 2017	(16)
Sublease Rental Receipts, 2018	(14)
Sublease Rental Receipts, 2019	(11)
Sublease Rental Receipts, 2020	(7)
Sublease Rental Receipts, Thereafter	(45)
Sublease Rental Receipts, Total	(109)
Net Lease Commitments, 2016	157
Net Lease Commitments, 2017	143
Net Lease Commitments, 2018	113
Net Lease Commitments, 2019	83
Net Lease Commitments, 2020	47
Net Lease Commitments, Thereafter	45
Net Lease Commitments, Total	$ 588

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Segment Information - Additional Information (Detail) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2015 USD ($) Segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Segment		3
Member co-share amounts and government subsidies		$ 12,300	$ 9,700	$ 7,300
Depreciation and amortization classified as benefit expense		$ 92	$ 116	$ 93
Percentage of total premium and services revenues derived from contracts with the federal government		73.00%	73.00%	75.00%
Provision for premium deficiency	$ (176)	$ (176)	$ 0	$ 0
Increase in future policy benefits payable				$ 350

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Segment Information by Segment (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Premiums									$ 52,409	$ 45,959	$ 38,829
Services									1,406	2,164	2,109
Total revenues-external customers									53,815	48,123	40,938
Total revenues	$ 13,361	$ 13,363	$ 13,732	$ 13,833	$ 12,328	$ 12,238	$ 12,222	$ 11,712	54,289	48,500	41,313
Investment income									474	377	375
Benefits									44,269	38,166	32,564
Operating costs									7,318	7,639	6,355
Depreciation and amortization									355	333	333
Total operating expenses									51,942	46,138	39,252
Income from operations									2,347	2,362	2,061
Gain on sale of business									270	0	0
Interest expense									186	192	140
Income before income taxes	$ 246	$ 648	$ 793	$ 744	$ 287	$ 551	$ 646	$ 686	2,431	2,170	1,921
Individual Medicare Advantage
Segment Reporting Information [Line Items]
Premiums									29,526	25,782	22,481
Group Medicare Advantage
Segment Reporting Information [Line Items]
Premiums									5,588	5,490	4,710
Medicare stand-alone PDP
Segment Reporting Information [Line Items]
Premiums									3,846	3,404	3,033
Total Medicare
Segment Reporting Information [Line Items]
Premiums									38,960	34,676	30,224
Fully-insured
Segment Reporting Information [Line Items]
Premiums									9,736	8,604	6,277
Specialty
Segment Reporting Information [Line Items]
Premiums									1,316	1,354	1,305
Medicaid and other
Segment Reporting Information [Line Items]
Premiums									2,397	1,325	1,023
Provider
Segment Reporting Information [Line Items]
Services									695	1,277	1,312
ASO and other
Segment Reporting Information [Line Items]
Services									681	788	738
Pharmacy
Segment Reporting Information [Line Items]
Services									30	99	59
Intersegment revenues
Segment Reporting Information [Line Items]
Total revenues									(23,013)	(18,925)	(14,744)
Intersegment revenues | Retail
Segment Reporting Information [Line Items]
Total revenues									0	0	0
Intersegment revenues | Group
Segment Reporting Information [Line Items]
Total revenues									93	78	51
Intersegment revenues | Healthcare Services
Segment Reporting Information [Line Items]
Total revenues									22,920	18,847	14,693
Intersegment revenues | Other Businesses
Segment Reporting Information [Line Items]
Total revenues									0	0	0
Intersegment revenues | Services
Segment Reporting Information [Line Items]
Total revenues									(18,090)	(15,176)	(11,941)
Intersegment revenues | Services | Retail
Segment Reporting Information [Line Items]
Total revenues									0	0	0
Intersegment revenues | Services | Group
Segment Reporting Information [Line Items]
Total revenues									93	78	51
Intersegment revenues | Services | Healthcare Services
Segment Reporting Information [Line Items]
Total revenues									17,997	15,098	11,890
Intersegment revenues | Services | Other Businesses
Segment Reporting Information [Line Items]
Total revenues									0	0	0
Intersegment revenues | Products
Segment Reporting Information [Line Items]
Total revenues									(4,923)	(3,749)	(2,803)
Intersegment revenues | Products | Retail
Segment Reporting Information [Line Items]
Total revenues									0	0	0
Intersegment revenues | Products | Group
Segment Reporting Information [Line Items]
Total revenues									0	0	0
Intersegment revenues | Products | Healthcare Services
Segment Reporting Information [Line Items]
Total revenues									4,923	3,749	2,803
Intersegment revenues | Products | Other Businesses
Segment Reporting Information [Line Items]
Total revenues									0	0	0
Operating Segments | Retail
Segment Reporting Information [Line Items]
Premiums									45,805	39,452	31,922
Services									9	39	18
Total revenues-external customers									45,814	39,491	31,940
Total revenues									45,948	39,588	32,032
Investment income									134	97	92
Benefits									39,708	33,508	27,164
Operating costs									5,118	4,576	3,232
Depreciation and amortization									192	165	146
Total operating expenses									45,018	38,249	30,542
Income from operations									930	1,339	1,490
Gain on sale of business									0
Interest expense									0	0	0
Income before income taxes									930	1,339	1,490
Operating Segments | Group
Segment Reporting Information [Line Items]
Premiums									6,569	6,456	6,237
Services									698	763	735
Total revenues-external customers									7,267	7,219	6,972
Total revenues									7,386	7,320	7,047
Investment income									26	23	24
Benefits									5,266	5,130	4,847
Operating costs									1,769	1,936	1,860
Depreciation and amortization									93	103	100
Total operating expenses									7,128	7,169	6,807
Income from operations									258	151	240
Gain on sale of business									0
Interest expense									0	0	0
Income before income taxes									258	151	240
Operating Segments | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Services									685	1,353	1,350
Total revenues-external customers									685	1,353	1,350
Total revenues									23,605	20,200	16,043
Investment income									0	0	0
Benefits									0	0	0
Operating costs									22,481	19,307	15,372
Depreciation and amortization									143	155	151
Total operating expenses									22,624	19,462	15,523
Income from operations									981	738	520
Gain on sale of business									0
Interest expense									0	0	0
Income before income taxes									981	738	520
Operating Segments | Other Businesses
Segment Reporting Information [Line Items]
Premiums									35	51	670
Services									14	9	6
Total revenues-external customers									49	60	676
Total revenues									125	120	735
Investment income									76	60	59
Benefits									87	102	962
Operating costs									14	17	56
Depreciation and amortization									0	0	6
Total operating expenses									101	119	1,024
Income from operations									24	1	(289)
Gain on sale of business									0
Interest expense									0	0	0
Income before income taxes									24	1	(289)
Operating Segments | Individual Medicare Advantage | Retail
Segment Reporting Information [Line Items]
Premiums									29,526	25,782	22,481
Operating Segments | Individual Medicare Advantage | Group
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Individual Medicare Advantage | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Individual Medicare Advantage | Other Businesses
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Group Medicare Advantage | Retail
Segment Reporting Information [Line Items]
Premiums									5,588	5,490	4,710
Operating Segments | Group Medicare Advantage | Group
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Group Medicare Advantage | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Group Medicare Advantage | Other Businesses
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Medicare stand-alone PDP | Retail
Segment Reporting Information [Line Items]
Premiums									3,846	3,404	3,033
Operating Segments | Medicare stand-alone PDP | Group
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Medicare stand-alone PDP | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Medicare stand-alone PDP | Other Businesses
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Total Medicare | Retail
Segment Reporting Information [Line Items]
Premiums									38,960	34,676	30,224
Operating Segments | Total Medicare | Group
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Total Medicare | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Total Medicare | Other Businesses
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Fully-insured | Retail
Segment Reporting Information [Line Items]
Premiums									4,243	3,265	1,160
Operating Segments | Fully-insured | Group
Segment Reporting Information [Line Items]
Premiums									5,493	5,339	5,117
Operating Segments | Fully-insured | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Fully-insured | Other Businesses
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Specialty | Retail
Segment Reporting Information [Line Items]
Premiums									261	256	210
Operating Segments | Specialty | Group
Segment Reporting Information [Line Items]
Premiums									1,055	1,098	1,095
Operating Segments | Specialty | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Specialty | Other Businesses
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Medicaid and other | Retail
Segment Reporting Information [Line Items]
Premiums									2,341	1,255	328
Operating Segments | Medicaid and other | Group
Segment Reporting Information [Line Items]
Premiums									21	19	25
Operating Segments | Medicaid and other | Healthcare Services
Segment Reporting Information [Line Items]
Premiums									0	0	0
Operating Segments | Medicaid and other | Other Businesses
Segment Reporting Information [Line Items]
Premiums									35	51	670
Operating Segments | Provider | Retail
Segment Reporting Information [Line Items]
Services									0	0	0
Operating Segments | Provider | Group
Segment Reporting Information [Line Items]
Services									40	23	21
Operating Segments | Provider | Healthcare Services
Segment Reporting Information [Line Items]
Services									655	1,254	1,291
Operating Segments | Provider | Other Businesses
Segment Reporting Information [Line Items]
Services									0	0	0
Operating Segments | ASO and other | Retail
Segment Reporting Information [Line Items]
Services									9	39	18
Operating Segments | ASO and other | Group
Segment Reporting Information [Line Items]
Services									658	740	714
Operating Segments | ASO and other | Healthcare Services
Segment Reporting Information [Line Items]
Services									0	0	0
Operating Segments | ASO and other | Other Businesses
Segment Reporting Information [Line Items]
Services									14	9	6
Operating Segments | Pharmacy | Retail
Segment Reporting Information [Line Items]
Services									0	0	0
Operating Segments | Pharmacy | Group
Segment Reporting Information [Line Items]
Services									0	0	0
Operating Segments | Pharmacy | Healthcare Services
Segment Reporting Information [Line Items]
Services									30	99	59
Operating Segments | Pharmacy | Other Businesses
Segment Reporting Information [Line Items]
Services									0	0	0
Eliminations/Corporate
Segment Reporting Information [Line Items]
Premiums									0	0	0
Services									0	0	0
Total revenues-external customers									0	0	0
Total revenues									(22,775)	(18,728)	(14,544)
Investment income									238	197	200
Benefits									(792)	(574)	(409)
Operating costs									(22,064)	(18,197)	(14,165)
Depreciation and amortization									(73)	(90)	(70)
Total operating expenses									(22,929)	(18,861)	(14,644)
Income from operations									154	133	100
Gain on sale of business									270
Interest expense									186	192	140
Income before income taxes									238	(59)	(40)
Eliminations/Corporate | Individual Medicare Advantage
Segment Reporting Information [Line Items]
Premiums									0	0	0
Eliminations/Corporate | Group Medicare Advantage
Segment Reporting Information [Line Items]
Premiums									0	0	0
Eliminations/Corporate | Medicare stand-alone PDP
Segment Reporting Information [Line Items]
Premiums									0	0	0
Eliminations/Corporate | Total Medicare
Segment Reporting Information [Line Items]
Premiums									0	0	0
Eliminations/Corporate | Fully-insured
Segment Reporting Information [Line Items]
Premiums									0	0	0
Eliminations/Corporate | Specialty
Segment Reporting Information [Line Items]
Premiums									0	0	0
Eliminations/Corporate | Medicaid and other
Segment Reporting Information [Line Items]
Premiums									0	0	0
Eliminations/Corporate | Provider
Segment Reporting Information [Line Items]
Services									0	0	0
Eliminations/Corporate | ASO and other
Segment Reporting Information [Line Items]
Services									0	0	0
Eliminations/Corporate | Pharmacy
Segment Reporting Information [Line Items]
Services									$ 0	$ 0	$ 0

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Expenses Associated With Long-Duration Insurance Products - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Long Duration Insurance Products [Line Items]
Percent of consolidated premiums and services revenues related to long-duration insurance products	1.00%
Future policy benefits payable	$ 2,151,000,000	$ 2,349,000,000
Benefit expense with future policy benefits payable	(80,000,000)	32,000,000	$ 354,000,000
Amortization of deferred acquisition costs	63,000,000	39,000,000	55,000,000
Adjustment to future policy benefits assuming unrealized gains on investments realized and reinvested at current yields	0	123,000,000
Increase in future policy benefits payable			350,000,000
Increase in reinsurance recoverable			107,000,000
Deferred acquisition costs associated with our individual major medical policies	26,000,000	59,000,000
100% Coinsurance Agreements
Long Duration Insurance Products [Line Items]
Future policy benefits payable	$ 205,000,000	210,000,000
Percentage of coinsurance agreement	100.00%
Closed Block Long Term Care Policies
Long Duration Insurance Products [Line Items]
Future policy benefits payable	$ 1,500,000,000	1,500,000,000	$ 243,000,000
Individual Major Medical Policies
Long Duration Insurance Products [Line Items]
Future policy benefits payable	$ 180,000,000	$ 297,000,000

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Schedule of Deferred Acquisition Cost and Future Policy Benefits Payable With Our Long-Duration Insurance Products (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Insurance [Abstract]
Other long-term assets, Deferred acquisition Costs	$ 135	$ 167
Trade accounts payable and accrued expenses, Deferred acquisition Cost	0	0
Long-term liabilities, Deferred acquisition Cost	0	0
Total asset (liability), Deferred acquisition Cost	135	167
Other long-term assets, Future policy benefits payable	0	0
Trade accounts payable and accrued expenses, Future policy benefits payable	(64)	(68)
Future policy benefits payable	(2,151)	(2,349)
Total asset (liability), Future policy benefits payable	$ (2,215)	$ (2,417)

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Reinsurance - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Reinsurer	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Effects of Reinsurance [Line Items]
Reinsurance recoverables included in other long-term assets	$ 668	$ 646
Percentage of reinsurance recoverables resulting from 100% coinsurance agreements	43.00%	45.00%
Premiums ceded	$ 821	$ 357	$ 33
Benefits ceded	$ 666	$ 272	$ 70
Number of reinsurers comprising other reinsurance recoverables balance | Reinsurer	18
Maximum carrying value of reinsurance recoverables for a number of reinsurers	$ 85
Number of reinsurers who have placed cash and securities in trusts | Reinsurer	3
Cash and securities in trusts held by certain reinsurers	$ 104
100% Coinsurance Agreements
Effects of Reinsurance [Line Items]
Percentage of coinsurance agreement	100.00%

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Balance and Financial Rating Related to Reinsurers (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance Recoverables	$ 668	$ 646
Protective Life Insurance Company
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance Recoverables	$ 184
A.M. Best Rating	A+ (superior)
Munich American Reassurance Company
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance Recoverables	$ 155
A.M. Best Rating	A+ (superior
Employers Reassurance Corporation
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance Recoverables	$ 91
A.M. Best Rating	A- (excellent)
General Re Life Corporation
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance Recoverables	$ 90
A.M. Best Rating	A++ (superior)
All Others
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance Recoverables	$ 148
A.M. Best Rating	A+ to B++ (superior to good)

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QUARTERLY FINANCIAL INFORMATION (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 13,361	$ 13,363	$ 13,732	$ 13,833	$ 12,328	$ 12,238	$ 12,222	$ 11,712	$ 54,289	$ 48,500	$ 41,313
Income before income taxes	246	648	793	744	287	551	646	686	2,431	2,170	1,921
Net income	$ 101	$ 314	$ 431	$ 430	$ 145	$ 290	$ 344	$ 368	$ 1,276	$ 1,147	$ 1,231
Basic earnings per common share (in dollars per share)	$ 0.68	$ 2.11	$ 2.88	$ 2.86	$ 0.96	$ 1.87	$ 2.22	$ 2.37	$ 8.54	$ 7.44	$ 7.81
Diluted earnings per common share (in dollars per share)	$ 0.67	$ 2.09	$ 2.85	$ 2.82	$ 0.94	$ 1.85	$ 2.19	$ 2.35	$ 8.44	$ 7.36	$ 7.73
Provision for premium deficiency	$ 176								$ 176	$ 0	$ 0
Provision for premium deficiency, net	$ 112
Provision for premium deficiency, per diluted share	$ 0.74

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Schedule I - Parent Company Financial Information (Condensed Balance Sheets) (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 2,571	$ 1,935	$ 1,138	$ 1,306
Investment securities	7,267	7,598
Other current assets	4,712	4,007
Total current assets	15,711	15,536
Property and equipment, net	1,384	1,228
Other long-term assets	2,502	1,583
Total assets	24,705	23,527
Current liabilities:
Book overdraft	301	334
Short-term borrowings	299	0
Total current liabilities	8,152	7,471
Long-term debt	3,821	3,825
Other long-term liabilities	235	236
Total liabilities	$ 14,359	$ 13,881
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $1 par; 10,000,000 shares authorized; none issued	$ 0	$ 0
Common stock, $0.16 2/3 par; 300,000,000 shares authorized; 198,372,059 shares issued at December 31, 2015 and 197,951,551 shares issued at December 31, 2014	33	33
Capital in excess of par value	2,530	2,330
Retained earnings	11,017	9,916
Accumulated other comprehensive income	58	223
Treasury stock, at cost, 50,084,043 shares at December 31, 2015 and 48,347,541 shares at December 31, 2014	(3,292)	(2,856)
Total stockholders’ equity	10,346	9,646	9,316	8,847
Total liabilities and stockholders’ equity	24,705	23,527
Parent Company
Current assets:
Cash and cash equivalents	1,389	1,211	$ 161	$ 151
Investment securities	256	201
Receivable from operating subsidiaries	1,124	873
Other current assets	224	180
Total current assets	2,993	2,465
Property and equipment, net	1,011	885
Investments in subsidiaries	14,276	13,983
Other long-term assets	437	114
Total assets	18,717	17,447
Current liabilities:
Payable to operating subsidiaries	3,322	3,130
Current portion of notes payable to operating subsidiaries	28	28
Book overdraft	38	54
Short-term borrowings	299	0
Other current liabilities	572	562
Total current liabilities	4,259	3,774
Long-term debt	3,821	3,825
Notes payable to operating subsidiaries	9	9
Other long-term liabilities	282	193
Total liabilities	8,371	7,801
Stockholders’ equity:
Preferred stock, $1 par; 10,000,000 shares authorized; none issued	0	0
Common stock, $0.16 2/3 par; 300,000,000 shares authorized; 198,372,059 shares issued at December 31, 2015 and 197,951,551 shares issued at December 31, 2014	33	33
Capital in excess of par value		2,330
Retained earnings		9,916
Accumulated other comprehensive income		223
Treasury stock, at cost, 50,084,043 shares at December 31, 2015 and 48,347,541 shares at December 31, 2014	(3,292)	(2,856)
Total stockholders’ equity	10,346	9,646
Total liabilities and stockholders’ equity	$ 18,717	$ 17,447

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Schedule I - Parent Company Financial Information (Condensed Balance Sheets) (Parenthetical) (Detail) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Preferred stock, par	$ 1	$ 1
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, issued	0	0
Common stock, par	$ 0.1667	$ 0.1667
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	198,372,059	197,951,551
Treasury stock, shares	50,084,043	48,347,541
Parent Company
Condensed Financial Statements, Captions [Line Items]
Preferred stock, par	$ 1	$ 1
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, issued	0	0
Common stock, par	$ 0.1667	$ 0.1667
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	198,372,059	197,951,551
Treasury stock, shares	50,084,043	48,347,541

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Schedule I - Parent Company Financial Information (Condensed Statements of Income) (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Total revenues	$ 13,361	$ 13,363	$ 13,732	$ 13,833	$ 12,328	$ 12,238	$ 12,222	$ 11,712	$ 54,289	$ 48,500	$ 41,313
Expenses:
Operating costs									7,318	7,639	6,355
Depreciation									354	328	309
Interest									186	192	140
Gain on sale of business									270	0	0
Benefit for income taxes									1,155	1,023	690
Net income	$ 101	$ 314	$ 431	$ 430	$ 145	$ 290	$ 344	$ 368	1,276	1,147	1,231
Parent Company
Revenues:
Management fees charged to operating subsidiaries									1,469	1,509	1,370
Investment and other income, net									5	4	3
Total revenues									1,474	1,513	1,373
Expenses:
Operating costs									1,370	1,434	1,366
Depreciation									252	212	193
Interest									186	192	141
Total operating expense									1,808	1,838	1,700
Loss before gain on sale of business, income taxes and equity in net earnings of subsidiaries									(334)	(325)	(327)
Gain on sale of business									270	0	0
Loss before income taxes and equity in net earnings of subsidiaries									(64)	(325)	(327)
Benefit for income taxes									(70)	(81)	(107)
Loss before equity in net earnings of subsidiaries									6	(244)	(220)
Equity in net earnings of subsidiaries									1,270	1,391	1,451
Net income									$ 1,276	$ 1,147	$ 1,231

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Schedule I - Parent Company Financial Information (Condensed Statements of Comprehensive Income) (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net income	$ 101	$ 314	$ 431	$ 430	$ 145	$ 290	$ 344	$ 368	$ 1,276	$ 1,147	$ 1,231
Other comprehensive (loss) income:
Change in gross unrealized investment gains/losses									(114)	122	(338)
Effect of income taxes									42	(44)	124
Total change in unrealized investment gains/losses, net of tax									(72)	78	(214)
Reclassification adjustment for net realized gains included in investment income									(146)	(20)	(22)
Effect of income taxes									53	7	8
Total reclassification adjustment, net of tax									(93)	(13)	(14)
Other comprehensive (loss) income, net of tax									(165)	65	(228)
Comprehensive income									1,111	1,212	1,003
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net income									$ 1,276	$ 1,147	$ 1,231

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Schedule I - Parent Company Financial Information (Condensed Statements of Cash Flows) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 868	$ 1,618	$ 1,716
Cash flows from investing activities:
Proceeds from sale of business	1,061	72	34
Acquisitions	(38)	(18)	(187)
Purchases of investment securities	(6,739)	(2,883)	(3,261)
Proceeds from sale of investment securities	5,493	2,409	1,592
Maturities of investment securities	1,065	885	1,077
Purchases of property and equipment, net	(523)	(528)	(441)
Net cash provided by (used in) investing activities	320	(63)	(1,182)
Cash flows from financing activities:
Proceeds from issuance of senior notes, net	0	1,733	0
Proceeds from issuance of commercial paper, net	298	0	0
Repayments of Long-term Debt	0	(500)	0
Change in book overdraft	(33)	(69)	79
Common stock repurchases	(385)	(872)	(531)
Dividends paid	(172)	(172)	(168)
Tax benefit from stock-based compensation	15	12	8
Proceeds from stock option exercises and other	21	29	60
Net cash used in financing activities	(552)	(758)	(702)
Increase (decrease) in cash and cash equivalents	636	797	(168)
Cash and cash equivalents at beginning of year	1,935	1,138	1,306
Cash and cash equivalents at end of year	2,571	1,935	1,138
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	953	1,499	1,554
Cash flows from investing activities:
Proceeds from sale of business	1,055	0	0
Acquisitions	0	0	0
Capital contributions to operating subsidiaries	(833)	(442)	(521)
Purchases of investment securities	(507)	(629)	(320)
Proceeds from sale of investment securities	18	606	35
Maturities of investment securities	108	149	104
Purchases of property and equipment, net	(378)	(380)	(223)
Net cash provided by (used in) investing activities	(537)	(696)	(925)
Cash flows from financing activities:
Proceeds from issuance of senior notes, net	0	1,733	0
Proceeds from issuance of commercial paper, net	298	0	0
Repayments of Long-term Debt	0	(500)	0
Change in book overdraft	(16)	(5)	7
Common stock repurchases	(385)	(872)	(531)
Dividends paid	(172)	(172)	(168)
Tax benefit from stock-based compensation	15	12	8
Proceeds from stock option exercises and other	22	51	65
Net cash used in financing activities	(238)	247	(619)
Increase (decrease) in cash and cash equivalents	178	1,050	10
Cash and cash equivalents at beginning of year	1,211	161	151
Cash and cash equivalents at end of year	$ 1,389	$ 1,211	$ 161

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Schedule I-Parent Company Financial Information (Notes to Condensed Financial Statements) - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Cash dividends received from subsidiary	$ 493	$ 927	$ 967
Interest-bearing rate minimum	1.51%
Interest-bearing rate maximum	6.65%
Aggregate statutory capital and surplus in our state regulated insurance subsidiaries	$ 6,600	6,000
Aggregate minimum regulatory requirements of statutory capital and surplus	4,600	4,100
Expected contributions of statutory capital and surplus into regulated subsidiaries (in first quarter of 2016)	450
Dividends that may be paid to the parent company without prior approval by state regulatory authorities in 2014	900
Dividends that were paid to the parent company without prior approval by state regulatory authorities	493
Majority-Owned Subsidiary, Unconsolidated
Condensed Financial Statements, Captions [Line Items]
Interest expense on subsidiary notes payable	1	$ 1	$ 1
Other long-term assets
Condensed Financial Statements, Captions [Line Items]
Related party receivable	$ 284

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Schedule II-Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance For Loss On Receivables
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 137	$ 118	$ 94
Acquired Balances	(39)	0	0
Charged (Credited) to Costs and Expenses	61	32	37
Charged to Other Accounts	(7)	28	18
Deductions or Write-offs	(51)	(41)	(31)
Balance at End of Period	101	137	118
Deferred Tax Asset Valuation Allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	48	28	28
Acquired Balances	0	0	0
Charged (Credited) to Costs and Expenses	6	(20)	0
Charged to Other Accounts	0	0	0
Deductions or Write-offs	0	0	0
Balance at End of Period	$ 42	$ 48	$ 28