Statement of Financial Position [Abstract]
Assets
Assets [Abstract]
Current assets:
Assets, Current [Abstract]
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Fixed maturity securities, current (amortized cost of $17,550 and $16,894)
Available-for-sale Securities, Debt Securities, Current
Equity securities, current
Equity Securities, Current
Amount of investments in equity securities measured at fair value. Effective January 1, 2018, the changes in fair value are recognized in net income. Prior to January 1, 2018, the changes in fair value are recognized in other comprehensive income.
Other invested assets, current
Other Short-term Investments
Accrued investment income
Accrued Investment Income Receivable
Premium receivables
Premiums Receivable, Net
Self-funded receivables
Self-Funded Receivables, Net
The carrying amount as of the balance sheet date due the entity from self-insured customers, net of the allowance for doubtful accounts.
Other receivables
Other Receivables
Income taxes receivable
Income Taxes Receivable, Current
Securities lending collateral
Securities Received as Collateral
Other current assets
Other Assets, Current
Total current assets
Assets, Current
Long-term investments:
Available-for-sale Securities, Noncurrent [Abstract]
Fixed maturity securities (amortized cost of $482 and $486)
Available-for-sale Securities, Debt Securities, Noncurrent
Equity securities
Equity securities, Long-term
Amount of investments in equity securities measured at fair value with changes in fair value recognized in net income.
Other invested assets
Other Long-term Investments
Property and equipment, net
Property, Plant and Equipment, Net
Goodwill
Goodwill
Other intangible assets
Intangible Assets, Net (Excluding Goodwill)
Other noncurrent assets
Other Assets, Noncurrent
Total assets
Assets
Liabilities and shareholders' equity
Liabilities and Equity [Abstract]
Current Liabilities:
Liabilities, Current [Abstract]
Policy Liabilities
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]
Medical claims payable
Liability for Claims and Claims Adjustment Expense
Reserves for future policy benefits
Liability For Future Policy Benefits Current
The sum of the known and estimated amounts payable which are expected to be recognized as such within one year or the normal operating cycle, if longer, as of the balance sheet date, to policyholders pertaining to insured events for long-duration contracts, which can be viewed as either (a) the present value of future benefits to be paid to or on behalf of policyholders and expenses less the present value of future net premiums payable under the insurance contracts or (b) the accumulated amount of net premiums already collected less the accumulated amount of benefits and expenses already paid to or on behalf of policyholders.
Other policyholder liabilities
Other Policyholder Funds
Total policy liabilities
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense
Unearned income
Unearned Premiums
Accounts payable and accrued expenses
Accounts Payable and Accrued Liabilities, Current
Income taxes payable
Accrued Income Taxes, Current
Security trades pending payable
Payables to Broker-Dealers and Clearing Organizations
Securities lending payable
Deposits Received for Securities Loaned, at Carrying Value
Short-term borrowings
Short-term Debt
Current portion of long-term debt
Long-term Debt, Current Maturities
Other current liabilities
Other Liabilities, Current
Total current liabilities
Liabilities, Current
Long-term debt, less current portion
Long-term Debt, Excluding Current Maturities
Reserves for future policy benefits, noncurrent
Liability for Future Policy Benefits
Deferred tax liabilities, net
Deferred Tax Liabilities, Net, Noncurrent
Other noncurrent liabilities
Other Liabilities, Noncurrent
Total liabilities
Liabilities
Commitment and contingencies – Note 11
Commitments and Contingencies
Shareholders' equity
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, without par value, shares authorized – 100,000,000; shares issued and outstanding – none
Preferred Stock, Value, Issued
Common stock, par value $0.01, shares authorized – 900,000,000; shares issued and outstanding – 257,354,383 and 257,395,577
Common Stock, Value, Issued
Additional paid-in capital
Additional Paid in Capital
Retained earnings
Retained Earnings (Accumulated Deficit)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Total shareholders' equity
Stockholders' Equity Attributable to Parent
Total liabilities and shareholders' equity
Liabilities and Equity
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table]
Derivative Instruments, Gain (Loss) [Table]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Derivative Contract [Domain]
Derivative Contract [Domain]
Forward Starting Pay Fixed Swaps [Member]
Forward Starting Pay Fixed Swaps [Member]
Forward Starting Pay Fixed Swaps
Income Statement Location [Axis]
Income Statement Location [Axis]
Income Statement Location [Domain]
Income Statement Location [Domain]
Interest Expense [Member]
Interest Expense [Member]
Net realized gains (losses) on financial instruments [Member]
Net realized gains (losses) on financial instruments [Member]
Primary financial statement caption encompassing net realized gains (losses) on financial instruments.
Other Comprehensive Income Location [Axis]
Other Comprehensive Income Location [Axis]
Other Comprehensive Income Location [Domain]
Other Comprehensive Income Location [Domain]
Hedging Designation [Axis]
Hedging Designation [Axis]
Hedging Designation [Domain]
Hedging Designation [Domain]
Hedging Relationship [Axis]
Hedging Relationship [Axis]
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Cash Flow Hedging [Member]
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Gain (Loss) Recognized In Other Comprehensive Income (Loss)
Derivative Instruments Gain (Loss) Recognized In Other Comprehensive Income (Loss)
Derivative Instruments Gain (Loss) Recognized In Other Comprehensive Income (Loss)
Hedge (loss) gain reclassified from accumulated other comprehensive loss
Hedge (loss) gain reclassified from accumulated other comprehensive loss
Hedge (loss) gain reclassified from accumulated other comprehensive loss.
Fair Value Disclosures [Abstract]
Fair Value, Estimate Not Practicable [Table]
Fair Value, Estimate Not Practicable [Table]
Fair Value, Estimate Not Practicable, Disclosure Items [Axis]
Fair Value, Estimate Not Practicable, Disclosure Items [Axis]
Fair Value, Estimate Not Practicable, Disclosure Items [Domain]
Fair Value, Estimate Not Practicable, Disclosure Items [Domain]
Carrying Value [Member]
Fair Value, Estimate Not Practicable, Carrying (Reported) Amount [Member]
Estimated Fair Value [Member]
Estimate of Fair Value Measurement [Member]
Fair Value, Hierarchy [Axis]
Fair Value, Hierarchy [Axis]
Fair Value Hierarchy [Domain]
Fair Value Hierarchy [Domain]
Level III [Member]
Fair Value, Inputs, Level 3 [Member]
Level II [Member]
Fair Value, Inputs, Level 2 [Member]
Level I [Member]
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other invested assets, long-term
Commercial paper
Commercial Paper
Notes
Notes Payable
Convertible debentures
Convertible Debt, Noncurrent
Derivative Financial Instruments
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Investments [Abstract]
Investment [Table]
Investment [Table]
Investment Type [Axis]
Investment Type [Axis]
Investments [Domain]
Investments [Domain]
Equity Securities [Member]
Equity Securities [Member]
Fixed Maturities [Member]
Fixed Maturities [Member]
Major Types of Debt and Equity Securities [Axis]
Major Types of Debt and Equity Securities [Axis]
Major Types of Fixed Maturity Securities
Major Types of Debt and Equity Securities [Domain]
United States Government Securities [Member]
US Government Agencies Debt Securities [Member]
States, Municipalities And Political Subdivisions, Tax-Exempt [Member]
US States and Political Subdivisions Debt Securities [Member]
Corporate Securities [Member]
Corporate Debt Securities [Member]
Residential Mortgage-Backed Securities [Member]
Residential Mortgage Backed Securities [Member]
Commercial Mortgage-Backed Securities [Member]
Commercial Mortgage Backed Securities [Member]
Other Securities [Member]
Other Security Investments [Member]
Other Securities [Member]
Other Debt Obligations [Member]
Schedule of Investments [Line Items]
Schedule of Investments [Line Items]
Number of securities, less than 12 months
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year
Estimated fair value, less than 12 months
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value
Gross unrealized loss, less than 12 months
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss
Number of securities, 12 months or greater
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year
Estimated fair value, 12 months or greater
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value
Gross unrealized loss, 12 months or greater
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss
Capital [Abstract]
Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period, Number of Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number
Granted, Number of Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures
Exercised, Number of Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Forfeited or expired, Number of Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period
Outstanding at end of period, Number of Shares
Exercisable at end of period, Number of Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number
Weighted-Average Option Price Per Share [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period, Weighted-Average Option Price per Share
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Granted, Weighted-Average Option Price per Share
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Exercised, Weighted-Average Option Price per Share
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Forfeited or expired, Weighted-Average Option Price per Share
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price
Outstanding at end of period, Weighted-Average Option Price per Share
Exercisable at end of period, Weighted-Average Option Price per Share
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price
Outstanding at end of period, Weighted-Average Remaining Contractual Life
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Exercisable at end of period, Weighted-Average Remaining Contractual Life
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term
Outstanding at end of period, Aggregate Intrinsic Value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value
Exercisable at end of period, Aggregate Intrinsic Value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value
Liability for Unpaid Claims and Claims Adjustment Expense, Activity in Liability [Abstract]
Medical Claims Payable
Liability for Claims and Claims Adjustment Expense [Table]
Segments [Axis]
Segments [Axis]
Segments [Domain]
Segments [Domain]
Government Business Segment [Member]
Government Business Segment [Member]
Government Business Segment
Commercial Specialty Business Segment [Member]
Commercial Specialty Business Segment [Member]
Commercial and Specialty Business Segment
Medical Claims Payable [Line Items]
Liability for Claims and Claims Adjustment Expense [Line Items]
Gross medical claims payable, beginning of period
Short Duration Contract Liability For Claims Adjustment Expense
The amount needed to reflect the estimated ultimate cost of settling short duration contract claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date for short duration.
Ceded medical claims payable, beginning of period
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments
Net medical claims payable, beginning of period
Liability for Unpaid Claims and Claims Adjustment Expense, Net
Liability For Unpaid Claims And Claims Adjustment Expense Purchase Adjustments
Liability For Unpaid Claims And Claims Adjustment Expense Purchase Adjustments
Liability For Unpaid Claims And Claims Adjustment Expense Purchase Adjustments
Current period net incurred medical claims
Current Year Claims and Claims Adjustment Expense
Prior periods redundancies
Prior Year Claims and Claims Adjustment Expense
Total net incurred medical claims
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims
Net payments attributable to current period medical claims
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year
Net payments attributable to prior periods medical claims
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years
Total net payments
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid
Short duration contract liability for unpaid claims and adjustment expense, Net
Short duration contract liability for unpaid claims and adjustment expense, Net
Short duration contract liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for short duration contract claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid short duration contract claims.
Ceded medical claims payable, end of period
Gross medical claims payable, end of period
Leases [Abstract]
Statement [Table]
Statement [Table]
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Other Noncurrent Assets [Member]
Other Noncurrent Assets [Member]
Other Current Liabilities [Member]
Other Current Liabilities [Member]
Other Noncurrent Liabilities [Member]
Other Noncurrent Liabilities [Member]
Statement [Line Items]
Statement [Line Items]
Operating Lease, Right-of-Use Asset
Operating Lease, Right-of-Use Asset
Operating Lease, Liability, Current
Operating Lease, Liability, Current
Operating Lease, Liability, Noncurrent
Operating Lease, Liability, Noncurrent
Operating Lease, Cost
Operating Lease, Cost
Short-term Lease, Cost
Short-term Lease, Cost
Sublease Income
Sublease Income
Lease, Cost
Lease, Cost
Operating Lease, Payments
Operating Lease, Payments
Operating Lease, Weighted Average Remaining Lease Term
Operating Lease, Weighted Average Remaining Lease Term
Weighted Average Discount Rate, Percent
Weighted Average Discount Rate, Percent
Reconciliation Of The Claims Development To The Claims Liability [Abstract]
Reconciliation Of The Claims Development To The Claims Liability [Abstract]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Net medical claims payable, end of period
Ceded medical claims payable end of period
Insurance lines other than short duration
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claim Adjustment Expense, Other Reconciling Item
Gross medical claims payable, end of period
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table]
Performance measurement period [Axis]
Performance measurement period [Axis]
Performance measurement period [Axis]
Performance measurement period [Domain]
Performance measurement period [Domain]
[Domain] for Performance measurement period [Axis]
2019 to 2021 [Member]
2019 to 2021 [Member]
2019 to 2021 [Member]
2015 to 2017 [Member]
2015 to 2017 [Member]
2015 to 2017 [Member]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Subsequent Event [Member]
Subsequent Event [Member]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Equity Unit Purchase Agreements [Member]
Equity Unit Purchase Agreements [Member]
Remarketable Subordinated Notes [Member]
Subordinated Debt [Member]
Accelerated Share Repurchase Agreement [Member]
Repurchase Agreements [Member]
Option Indexed to Issuer's Equity [Axis]
Option Indexed to Issuer's Equity [Axis]
Option Indexed to Issuer's Equity, Type [Domain]
Option Indexed to Issuer's Equity, Type [Domain]
Call Option [Member]
Call Option [Member]
Put Option [Member]
Put Option [Member]
Position [Axis]
Position [Axis]
Position [Domain]
Position [Domain]
Award Type [Axis]
Award Type [Axis]
Equity Award [Domain]
Equity Award [Domain]
Restricted Stock Units (RSUs) [Member]
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
Dividends Payable, Amount Per Share
Dividends Payable, Amount Per Share
Dividends Payable, Date to be Paid
Dividends Payable, Date to be Paid
Dividends Payable, Date of Record
Dividends Payable, Date of Record
Increase In Stock Repurchase Program Authorization
Increase In Stock Repurchase Program Authorization
The amount of an increase authorized by an entity's Board of Directors to a previously authorized stock repurchase program.
Proceeds from Issuance of Common Stock
Proceeds from Issuance of Common Stock
Income Statement [Abstract]
Revenues
Revenues [Abstract]
Premiums
Premiums Earned, Net
Administrative fees
Sales Revenue, Services, Net
Administrative fees and other revenue
Other Income
Total operating revenue
Insurance Services Revenue
Net investment income
Net Investment Income
Net realized gains (losses) on financial instruments
Net realized (losses) gains on financial instruments
Net realized (losses) gains on financial instruments
Other-than-temporary impairment losses on investments:
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities [Abstract]
Total other-than-temporary impairment losses on investments
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities
Portion of other-than-temporary impairment losses recognized in other comprehensive income
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities
Other-than-temporary impairment losses recognized in income
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net
Total revenues
Revenues
Expenses
Benefits, Losses and Expenses [Abstract]
Benefit expense
Policyholder Benefits and Claims Incurred, Net
Selling, general and administrative expense
Selling, General and Administrative Expense
Interest expense
Interest Expense
Amortization of other intangible assets
Amortization of Intangible Assets
(Gain) loss on extinguishment of debt
Gain (Loss) on Extinguishment of Debt
Total expenses
Benefits, Losses and Expenses
Income tax expense
Income Tax Expense (Benefit)
Net income
Net Income (Loss) Attributable to Parent
Net income per share
Earnings Per Share [Abstract]
Basic net income per share
Earnings Per Share, Basic
Diluted net income per share
Earnings Per Share, Diluted
Dividends per share
Common Stock, Dividends, Per Share, Declared
Restructuring Charges [Abstract]
Schedule of Restructuring and Related Costs [Table]
Schedule of Restructuring and Related Costs [Table]
Restructuring Activities Implemented By Year [Axis]
Restructuring Activities Implemented By Year [Axis]
Restructuring Activities Implemented By Year [Axis]
Restructuring Activities Implemented By Year [Domain]
Restructuring Activities Implemented By Year [Domain]
Restructuring Activities Implemented By Year [Domain]
Restructuring and Related Cost, by Type of Restructuring [Axis]
Restructuring Type [Axis]
Type of Restructuring [Domain]
Type of Restructuring [Domain]
Restructuring Activity Of Individual Segments Reporting [Axis]
Restructuring Activity Of Individual Segments Reporting [Axis]
Restructuring Activity Of Individual Segments Reporting [Axis]
Restructuring Activity Of Individual Segments Reporting [Domain]
Restructuring Activity Of Individual Segments Reporting [Domain]
Restructuring Activity Of Individual Segments Reporting [Domain]
Commercial and Specialty Business [Member]
Commercial Specialty [Member]
Commercial Specialty [Member]
Other [Member]
Other Segment [Member]
Other segment
Restructuring Cost and Reserve [Line Items]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve [Roll Forward]
Restructuring Reserve [Roll Forward]
Denominator for basic earnings per share - weighted-average shares
Weighted Average Number of Shares Outstanding, Basic
Effect of dilutive securities – employee stock options, nonvested restricted stock awards, convertible debentures and equity units
Weighted Average Number Diluted Shares Outstanding Adjustment
Denominator for diluted earnings per share
Weighted Average Number of Shares Outstanding, Diluted
Exchange Traded Funds [Member]
Exchange Traded Funds [Member]
Fixed Maturity Mutual Funds [Member]
Fixed Maturity Mutual Funds [Member]
Fixed Maturity Mutual Funds [Member]
Common Equity Securities [Member]
Common Equity Securities [Member]
Common Equity Securities [Member]
Private Equity Securities [Member]
Private Equity Funds [Member]
Investment [Line Items]
Investment [Line Items]
Equity Securities
Equity Securities
Fair value of investments in equity securities.
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of Medical Members
Number Of Medical Members
Number of medical members served.
Number of counties in the Kansas City area the Company does not serve
Number Of Counties In State Of Kansas Company Does Not Serve
Number Of Counties In The State Of Kansas Company Does Not Serve
Number of states in which the Company is licensed to conduct insurance operations
Number of States in which Entity Operates
Fair Value Measurements By Level For Assets Measured At Fair Value On A Recurring Basis
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Reconciliation Of The Beginning And Ending Balances Of Assets Measured At Fair Value On A Recurring Basis Using Level III Inputs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Carrying And Fair Values By Level Of Financial Instruments Not Recorded At Fair Value On Consolidated Balance Sheet
Carrying And Fair Values By Level Of Financial Instruments Not Recorded At Fair Value On Consolidated Balance Sheet [Table Text Block]
-- None. No documentation exists for this element. --
Business Combinations [Abstract]
Business Acquisitions
Mergers, Acquisitions and Dispositions Disclosures [Text Block]
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Major Types of Debt and Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
Total gains (losses) recognized in net income
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings
Total gains (losses) recognized in accumulated other comprehensive loss
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)
Purchases
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases
Sales
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales
Settlements
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements
Transfers into Level III
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3
Transfers out of Level III
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3
Ending balance
Change in unrealized losses included in net income related to assets still held
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)
Liability for Claims and Claims Adjustment Expense [Abstract]
Medical Claims payable
Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block]
Denominator for Basic and Diluted Earnings Per Share
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Due in one year or less, Amortized Cost
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis
Due after one year through five years, Amortized Cost
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis
Due after five years through ten years, Amortized Cost
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis
Due after ten years, Amortized Cost
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis
Mortgage-backed securities, Amortized Cost
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis
Available-for-sale securities, Amortized Cost
Available-for-sale Securities, Amortized Cost Basis
Due in one year or less, Estimated Fair Value
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value
Due after one year through five years, Estimated Fair Value
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value
Due after five years through ten years, Estimated Fair Value
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value
Due after ten years, Estimated Fair Value
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value
Mortgage-backed securities, Estimated Fair Value
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value
Available-for-sale securities, Estimated Fair Value
Available-for-sale Securities
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies [Table]
Commitments And Contingencies [Table]
Commitments and contingencies [Table].
Litigation Case [Axis]
Litigation Case [Axis]
Litigation Case [Domain]
Litigation Case [Domain]
Anthem, Inc. v. Express Scripts, Inc. [Member]
Anthem, Inc. v. Express Scripts, Inc. [Member]
Anthem, Inc. v. Express Scripts, Inc. [Member]
Cyber Attack [Member]
Cyber Attack [Member]
Cyber Attack
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Minimum [Member]
Minimum [Member]
Maximum [Member]
Maximum [Member]
Loss Contingency Nature [Axis]
Loss Contingency Nature [Axis]
Loss Contingency, Nature [Domain]
Loss Contingency, Nature [Domain]
Penn Treaty [Member]
Penn Treaty [Member]
Penn Treaty [Member]
Gain Contingency, Nature [Axis]
Gain Contingencies, Nature [Axis]
Gain Contingency, Nature [Domain]
Gain Contingency, Nature [Domain]
Damages for Pharmacy Pricing [Member]
Pharmacy pricing [Member]
Pharmacy pricing [Member]
Damages for Operational Breaches [Member]
Operational [Member]
Operational [Member]
Commitments And Contingencies [Line Items]
Commitments And Contingencies [Line Items]
Commitments And Contingencies [Line Items]
Gross premium tax rate, state of California
Gross Premium Tax Rate
Gross premium tax rate
Estimate of possible loss on loss contingencies
Loss Contingency, Estimate of Possible Loss
Settlement amount
Litigation Settlement, Amount Awarded to Other Party
Estimated liability for guaranty association assessments
Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability
Approximate amount of damages sought for breaches
Loss Contingency, Damages Sought, Value
Proceeds originally received at time of divestiture
Proceeds from Divestiture of Businesses
Merger Agreement, Termination Fee
Merger Agreement, Termination Fee
Merger Agreement, Termination Fee
Investments [Line Items]
Cost or Amortized Cost
Gross Unrealized Gains
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax
Gross Unrealized Losses, Less than 12 Months
Gross Unrealized Losses, 12 Months or Greater
Available-for-sale Securities
Non-Credit Component of Other-Than-Temporary Impairments Recognized in Accumulated Other Comprehensive Income
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent, Available-for-sale Securities
Investments
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Accumulated Other Comprehensive Loss
Comprehensive Income (Loss) Note [Text Block]
Derivative Instruments and Hedging Activities Disclosures [Table]
Derivative Instruments and Hedging Activities Disclosures [Table]
Long term debt, current maturities [Domain]
Long term debt, current maturities [Domain]
Long term debt, current maturities [Domain]
Long-term Debt [Member]
Long-term Debt [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Amount of Hedged Item
Derivative, Amount of Hedged Item
Fair value hedges, cumulative basis adjustments
Fair value hedges, cumulative basis adjustments
Cumulative basis adjustments for fair value hedges.
Debt Disclosure [Abstract]
Debt
Debt Disclosure [Text Block]
Summary of Cash Dividend Activity
Dividends Declared [Table Text Block]
Summary of Share Repurchases
Class of Treasury Stock [Table Text Block]
Summary of Stock Option Activity
Share-based Compensation, Stock Options, Activity [Table Text Block]
Summary of Nonvested Restricted Stock Activity Including Restricted Stock Units
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
Summary of Weighted-Average Assumptions Used to Estimate the Fair Value of Options Granted During the Periods
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Schedule of Weighted-Average Fair Values Determined for the Periods
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]
Components Of Accumulated Other Comprehensive Loss
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Other Comprehensive Income (Loss) Reclassification Adjustments
Comprehensive Income (Loss) [Table Text Block]
Segment Reporting [Abstract]
Revenue from External Customers by Products and Services [Table]
Revenue from External Customers by Products and Services [Table]
Products and Services [Axis]
Products and Services [Axis]
Products and Services [Domain]
Products and Services [Domain]
Managed Care Products [Member]
Managed Care Products [Member]
Managed Care Products [Member]
Managed Care Services [Member]
Managed Care Services [Member]
Managed Care Services [Member]
Dental Vision Products And Services [Member]
Dental Vision Products And Services [Member]
Dental Vision Products And Services [Member]
Other Products [Member]
Other Products [Member]
Other Products [Member]
Other Segment [Member]
Revenue from External Customer [Line Items]
Revenue from External Customer [Line Items]
Insurance Services Revenue
Organization
Nature of Operations [Text Block]
Options granted during the period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Restricted stock awards granted during the period
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Other Invested Assets, Current [Member]
Short-term Investments [Member]
Derivatives [Member]
Derivative [Member]
Cash equivalents
Cash and Cash Equivalents, Fair Value Disclosure
Securities lending collateral
Securities Held as Collateral, at Fair Value
Derivative assets
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement
Total assets
Assets, Fair Value Disclosure, Recurring
Derivative liabilities
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement
Total liabilities
Liabilities, Fair Value Disclosure, Recurring
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
Convertible Debt [Member]
Convertible Debt [Member]
Variable Rate [Axis]
Variable Rate [Axis]
Variable Rate [Domain]
Variable Rate [Domain]
Debt Instrument, Redemption, Period [Axis]
Debt Instrument, Redemption, Period [Axis]
Debt Instrument, Redemption, Period [Domain]
Debt Instrument, Redemption, Period [Domain]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Outstanding principal amount
Long-term Debt, Gross
Unamortized debt discount
Debt Instrument, Unamortized Discount
Net debt carrying amount
Equity component carrying amount
Debt Instrument, Convertible, Carrying Amount of Equity Component
Conversion rate (shares of common stock per $1,000 of principal)
Debt Instrument, Convertible, Conversion Ratio
Effective conversion price (per $1,000 of principal amount) per share
Debt Instrument, Convertible, Conversion Price
Defined Benefit Plan [Abstract]
Retirement Plan Type [Axis]
Retirement Plan Type [Axis]
Retirement Plan Type [Domain]
Retirement Plan Type [Domain]
Pension Plan [Member]
Pension Plan [Member]
Payment for Pension and Other Postretirement Benefits
Payment for Pension and Other Postretirement Benefits
Defined Benefit Plan, Plan Assets, Contributions by Employer
Defined Benefit Plan, Plan Assets, Contributions by Employer
Income Tax Disclosure [Abstract]
Income Taxes
Income Tax Disclosure [Text Block]
Document and Entity Information
-- None. No documentation exists for this element. --
Document Type
Document Type
Amendment Flag
Amendment Flag
Document Period End Date
Document Period End Date
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Trading Symbol
Trading Symbol
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Filer Category
Entity Filer Category
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Earnings Per Share
Earnings Per Share [Text Block]
Short-term Debt, Type [Axis]
Short-term Debt, Type [Axis]
Short-term Debt, Type [Domain]
Short-term Debt, Type [Domain]
Commercial Paper
Commercial Paper [Member]
Senior Unsecured Notes [Member]
Senior Unsecured Notes [Member]
Senior Unsecured Notes [Member]
Senior Convertible Debentures [Member]
Five Point Two Five Zero Percent Due Two Thousand Sixteen [Member]
Five Point Two Five Zero Percent Due Two Thousand Sixteen [Member]
Five Point Two Five Zero Percent Due Two Thousand Sixteen [Member]
Two Point Three Seven Five Percent Due Two Thousand And Seventeen [Member]
Two Point Three Seven Five Percent Due Two Thousand And Seventeen [Member]
Two Point Three Seven Five Percent Due Two Thousand And Seventeen [Member].
Five Point Eight Seven Five Percent Due Two Thousand Seventeen [Member]
Five Point Eight Seven Five Percent Due Two Thousand Seventeen [Member]
Five Point Eight Seven Five Percent Due Two Thousand Seventeen [Member]
One Point Eight Seven Five Percent Due Two Thousand Eighteen [Member]
One Point Eight Seven Five Percent Due Two Thousand Eighteen [Member]
One Point Eight Seven Five Percent Due Two Thousand Eighteen [Member]
Two Point Three Zero Zero Percent Due Two Thousand Eighteen [Member]
Two Point Three Zero Zero Percent Due Two Thousand Eighteen [Member]
Two Point Three Zero Zero Percent Due Two Thousand Eighteen [Member]
Two Point Two Five Zero Percent Due Two Thousand Nineteen [Member]
Two Point Two Five Zero Percent Due Two Thousand Nineteen [Member]
Seven Point Zero Zero Zero Percent Due Two Thousand Nineteen [Member]
Seven Point Zero Zero Zero Percent Due Two Thousand Nineteen [Member]
Seven Point Zero Zero Zero Percent Due Two Thousand Nineteen [Member]
Four Point Three Five Zero Percent Due Two Thousand Twenty [Member]
Four Point Three Five Zero Percent Due Two Thousand Twenty [Member]
Four Point Three Five Zero Percent Due Two Thousand Twenty
Three Point Seven Zero Zero Percent Due Two Thousand Twenty One [Member]
Three Point Seven Zero Zero Percent Due Two Thousand Twenty One [Member]
Three Point Seven Zero Zero Percent Due Two Thousand Twenty One [Member]
Three Point One Two Five Percent Due Two Thousand Twenty Two [Member]
Three Point One Two Five Percent Due Two Thousand Twenty Two [Member]
Three Point One Two Five Percent Due Two Thousand Twenty Two
Three Point Three Zero Zero Percent Due Two Thousand Twenty Three [Member]
Three Point Three Zero Zero Percent Due Two Thousand Twenty Three [Member]
Three Point Three Zero Zero Percent Due Two Thousand Twenty Three
Three Point Five Zero Zero Percent Due Two Thousand Twenty Four [Member]
Three Point Five Zero Zero Percent Due Two Thousand Twenty Four [Member]
Three Point Five Zero Zero Percent Due Two Thousand Twenty Four [Member]
Five Point Nine Five Zero Percent Due Two Thousand Thirty Four [Member]
Five Point Nine Five Zero Percent Due Two Thousand Thirty Four [Member]
Five Point Nine Five Zero Percent Due two Thousand Thirty Four [Member]
Five Point Eight Five Zero Percent Due Two Thousand Thirty Six [Member]
Five Point Eight Five Zero Percent Due Two Thousand Thirty Six [Member]
Five Point eight Five Zero Percent Due Two Thousand Thirty Six [Member]
Six Point Three Seven Five Percent Due Two Thousand Thirty Seven [Member]
Six Point Three Seven Five Percent Due Two Thousand Thirty Seven [Member]
Six Point Three Seven Five Percent Due Two thousand Thirty seven [Member]
Five Point Eight Zero Zero Percent Due Two Thousand Forty [Member]
Five Point Eight Zero Zero Percent Due Two Thousand Forty [Member]
Five Point Eight Zero Zero Percent Due Two Thousand Forty
Four Point Six Two Five Percent Due Two Thousand Forty Two [Member]
Four Point Six Two Five Percent Due Two Thousand Forty Two [Member]
Four Point Six Two Five Percent Due Two Thousand Forty Two
Four Point Six Five Zero Percent Due Two Thousand Forty Three [Member]
Four Point Six Five Zero Percent Due Two Thousand Forty Three [Member]
-- None. No documentation exists for this element. --
Four Point Six Five Zero Percent Due Two Thousand Forty Four [Member]
Four Point Six Five Zero Percent Due Two Thousand Forty Four [Member]
Four Point Six Five Zero Percent Due Two Thousand Forty Four [Member]
Five Point One Zero Zero Percent Due Two Thousand Forty Four [Member]
Five Point One Zero Zero Percent Due Two Thousand Forty Four [Member]
Five Point One Zero Zero Percent Due Two Thousand Forty Four [Member]
Four Point Eight Five Zero Percent Due Two Thousand Fifty Four [Member]
Four Point Eight Five Zero Percent Due Two Thousand Fifty Four [Member]
Four Point Eight Five Zero Percent Due Two Thousand Fifty Four [Member]
One Point Nine Zero Zero Percent Due Two Thousand Twenty Eight [Member]
One Point Nine Zero Zero Percent Due Two Thousand Twenty Eight [Member] [Member]
One Point Nine Zero Zero Percent Due Two Thousand Twenty Eight [Member]
Two Point Seven Five Zero Percent Due Two Thousand Forty Two [Member]
Two Point Seven Five Zero Percent Due Two Thousand Forty Two [Member]
-- None. No documentation exists for this element. --
Nine Point Zero Zero Zero Percent Due Two Thousand Twenty Seven [Member]
Nine Point Zero Zero Zero Percent Due Two Thousand Twenty Seven [Member]
Nine Point Zero Zero Zero Percent Due Two Thousand Twenty Seven [member]
Schedule of Business Acquisitions, by Acquisition [Table]
Schedule of Business Acquisitions, by Acquisition [Table]
Business Acquisition [Axis]
Business Acquisition [Axis]
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
America’s 1st Choice [Member]
America’s 1st Choice [Member]
America’s 1st Choice [Member]
Geographical [Axis]
Geographical [Axis]
Geographical [Domain]
Geographical [Domain]
FLORIDA
FLORIDA
State of South Carolina [Member]
SOUTH CAROLINA
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Customer relationships and provider networks
Finite-Lived Intangible Assets [Member]
Customer Relationships [Member]
Customer Relationships [Member]
Class of Stock [Axis]
Class of Stock [Axis]
Class of Stock [Domain]
Class of Stock [Domain]
Business Acquisition [Line Items]
Business Acquisition [Line Items]
Number Of Medical Members
Business Acquisition, Goodwill, Expected Tax Deductible Amount
Business Acquisition, Goodwill, Expected Tax Deductible Amount
Goodwill, Purchase Accounting Adjustments
Goodwill, Purchase Accounting Adjustments
Other intangible assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill
Intangible assets amortization period, years
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life
Number Of Counties In Which Entity Operates
Number Of Counties In Which Entity Operates
Number Of Counties In Which Entity Operates
Class of Treasury Stock [Table]
Class of Treasury Stock [Table]
Share Repurchase Program [Axis]
Share Repurchase Program [Axis]
Share Repurchase Program [Domain]
Share Repurchase Program [Domain]
Equity, Class of Treasury Stock [Line Items]
Equity, Class of Treasury Stock [Line Items]
Shares repurchased
Stock Repurchased and Retired During Period, Shares
Average price per share
Stock Repurchased and Retired During Period Average Price
Stock Repurchased and Retired During Period Average Price
Aggregate cost
Stock Repurchased and Retired During Period, Value
Authorization remaining at the end of the period
Stock Repurchase Program, Remaining Authorized Repurchase Amount
Statement of Cash Flows [Abstract]
Operating activities
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income
Adjustments to reconcile net income to net cash provided by operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Net realized (gains) losses on financial instruments
Other-than-temporary impairment losses recognized in income
(Gain) loss on extinguishment of debt
Deferred income taxes
Deferred Income Tax Expense (Benefit)
Amortization, net of accretion
Amortization
Depreciation expense
Depreciation
Share-based compensation
Share-based Compensation
Changes in operating assets and liabilities:
Increase (Decrease) in Operating Capital [Abstract]
Receivables, net
Increase (Decrease) in Receivables
Other invested assets
Increase (Decrease) in Trading Securities
Other assets
Increase (Decrease) in Other Operating Assets
Policy liabilities
Increase (Decrease) in Insurance Liabilities
Unearned income
Increase (Decrease) in Unearned Premiums
Accounts payable and accrued expenses
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Other liabilities
Increase (Decrease) in Other Operating Liabilities
Income taxes
Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable
Other, net
Increase (Decrease) in Other Operating Assets and Liabilities, Net
Net cash provided by operating activities
Net Cash Provided by (Used in) Operating Activities
Investing activities
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchases of fixed maturity securities
Payments to Acquire Available-for-sale Securities, Debt
Proceeds from fixed maturity securities:
Proceeds from Sale and Maturity of Available-for-sale Securities [Abstract]
Sales
Proceeds from Sale of Available-for-sale Securities, Debt
Maturities, calls and redemptions
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities
Purchases of equity securities
Payments to acquire equity securities
Payments to acquire equity securities.
Proceeds from sales of equity securities
Proceeds from sale of equity securities
Proceeds from sale of equity securities.
Purchases of other invested assets
Payments to Acquire Other Investments
Proceeds from sales of other invested assets
Proceeds from Sale and Maturity of Other Investments
Change in collateral and settlements of non-hedging derivatives
Payments for (Proceeds from) Derivative Instrument, Investing Activities
Changes in securities lending collateral
Increase (Decrease) in Collateral Held under Securities Lending
Purchases of subsidiaries, net of cash acquired
Payments to Acquire Businesses, Net of Cash Acquired
Purchases of property and equipment
Payments to Acquire Property, Plant, and Equipment
Proceeds from sales of property and equipment
Proceeds from Sale of Property, Plant, and Equipment
Other, net
Payments for (Proceeds from) Other Investing Activities
Net cash used in investing activities
Net Cash Provided by (Used in) Investing Activities
Financing activities
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net proceeds from (repayments of) commercial paper borrowings
Proceeds from (Repayments of) Commercial Paper
Proceeds from long-term borrowings
Proceeds from Issuance of Long-term Debt
Repayments of long-term borrowings
Repayments of Long-term Debt
Proceeds from short-term borrowings
Proceeds from Short-term Debt
Repayments of short-term borrowings
Repayments of Short-term Debt
Changes in securities lending payable
Increase (Decrease) in Securities Lending Payable
Changes in bank overdrafts
Increase (Decrease) in Outstanding Checks, Financing Activities
Premiums paid on equity call options
Payments for Hedge, Financing Activities
Proceeds from sale of put options
Proceeds from Hedge, Financing Activities
Proceeds from Issuance of common stock under Equity Units stock purchase contracts
Repurchase and retirement of common stock
Payments for Repurchase of Common Stock
Change in collateral and settlements of debt-related derivatives
Payments For Proceeds From Financing Derivatives
The net cash outflow or inflow from derivative instruments during the period, which are classified as financing activities.
Cash dividends
Payments of Dividends
Proceeds from issuance of common stock under employee stock plans
Proceeds from Stock Options Exercised
Taxes paid through withholding of common stock under employee stock plans
Payments Related to Tax Withholding for Share-based Compensation
Excess tax benefits from share-based compensation
Excess Tax Benefit from Share-based Compensation, Financing Activities
Net cash used in financing activities
Net Cash Provided by (Used in) Financing Activities
Effect of foreign exchange rates on cash and cash equivalents
Effect of Exchange Rate on Cash and Cash Equivalents
Change in cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
Fair value of collateral received at time of securities lending transactions
Securities Loaned, Fair Value of Collateral
Securities Lending Transactions Ratio of Fair Value of Collateral Held To Securities On Loan
Securities Lending Transactions Ratio of Fair Value of Collateral Held To Securities On Loan
Ratio of fair value of collateral held to fair value of securities loaned in securities lending transactions.
Securities lending transactions, initial collateral percentage value
Securities Lending Transactions Initial Collateral Percentage Value
Initial minimum percentage of cash and/or securities collateral accepted as compared to the value of securities on loan in a securities lending transaction.
Fixed Rate Debt [Member]
Fixed Rate Debt [Member]
Fixed Rate Debt
Interest Rate Swaps [Member]
Swap [Member]
Net Realized Investments Gain Loss [Member]
Fair Value Hedging [Member]
Fair Value Hedging [Member]
Total income from the effects of fair value or cash flow hedges
Total income from the effects of fair value or cash flow hedges
Total amount of income in the income statement in which the effects of fair value or cash flow hedges are recorded.
Total expense from the effects of fair value or cash flow hedges
Total expense from the effects of fair value or cash flow hedges
Total amount of expense in the income statement in which the effects of fair value or cash flow hedges are recorded.
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments
Statement of Comprehensive Income [Abstract]
Net income
Other comprehensive income (loss), net of tax:
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Change in net unrealized gains/losses on investments
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax
Change in non-credit component of other-than-temporary impairment losses on investments
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent, Available-for-sale Securities
Change in net unrealized losses on cash flow hedges
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax
Change in net periodic pension and postretirement costs
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Foreign currency translation adjustments
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Other comprehensive income (loss)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Total comprehensive income
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Restricted Stock Shares and Units [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at Beginning Balance, Restricted Stock Shares and Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Granted, Restricted Stock Shares and Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Vested, Restricted Stock Shares And Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Forfeited, Restricted Stock Shares And Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Nonvested at Ending Balance, Restricted Stock Shares and Units
Weighted-Average Grant Date Fair Value Per Share [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested at Beginning Balance, Weighted-Average Grant Date Fair Value per Share
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Granted, Weighted-Average Grant Date Fair Value per Share
Vested, Weighted-Average Grant Date Fair Value per Share
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Forfeited, Weighted-Average Grant Date Fair Value per Share
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Nonvested at Ending Balance, Weighted-Average Grant Date Fair Value per Share
Schedule of Available-for-sale Securities [Table]
Schedule of Available-for-sale Securities [Table]
Schedule of Available-for-sale Securities [Line Items]
Schedule of Available-for-sale Securities [Line Items]
Proceeds
Proceeds from Sale of Available-for-sale Securities
Gross realized gains
Available-for-sale Securities, Gross Realized Gains
Gross realized losses
Available-for-sale Securities, Gross Realized Losses
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Number of Reportable Segments
Number of Reportable Segments
Investments (Gains and Losses Recognized on Equity Securities) [Abstract]
Investments (Gains and Losses Recognized on Equity Securities) [Abstract]
Schedule of losses and gains related to equity securities [Table]
Schedule of losses and gains related to equity securities [Table]
Schedule of losses and gains related to equity securities [Table]
Investment [Axis]
Investment [Axis]
Investment [Domain]
Investment [Domain]
Schedule of losses and gains related to equity securities [Line Items]
Schedule of losses and gains related to equity securities [Line Items]
[Line Items] for Schedule of losses and gains related to equity securities [Table]
Less: Net realized gains recognized on sale of equity securities during the period
Equity Securities, Realized Gains (Losses) on Sales
Net realized gains (losses) recognized on equity securities sold during the period.
Unrealized gains (losses) recognized on equity securities still held
Unrealized Gains and Losses Recognized on Equity Securities
Unrealized gains (losses) recognized on equity securities still held at end of reporting period.
Capital Stock
Stockholders' Equity Note Disclosure [Text Block]
Accounting Policies [Abstract]
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Foreign Currency
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Cash and Cash Equivalents
Cash and Cash Equivalents, Policy [Policy Text Block]
Leases
Lessee, Leases [Policy Text Block]
Revenue Recognition
Revenue Recognition, Policy [Policy Text Block]
Recently Adopted Accounting Guidance
New Accounting Pronouncements, Policy [Policy Text Block]
Recent Accounting Guidance Not Yet Adopted
Description of New Accounting Pronouncements Not yet Adopted [Text Block]
Non-Hedging Instrument [Member]
Not Designated as Hedging Instrument [Member]
Hedging Status [Axis]
Hedging Status [Axis]
Hedging Status [Axis]
Hedging Status [Domain]
Hedging Status [Domain]
[Domain] for Hedging Status [Axis]
Expired hedge [Domain]
Expired hedge [Domain]
Expired hedge [Domain]
Collateral posted
Derivative Liability, Collateral, Right to Reclaim Cash, Offset
Collateral received
Derivative Asset, Collateral, Obligation to Return Cash, Offset
Derivative Notional Amount Expired
Derivative Notional Amount Expired
Represents the aggregate notional amount of expired derivatives.
Settlement amount
Settlement amount
Represents the settlement amount either due to counterparties or us upon expiration of derivatives.
Settlement amount received
Settlement amount received
Represents the settlement amount received from counterparties upon expiration of derivatives.
Loss on Cash Flow Hedge Ineffectiveness
Loss on Cash Flow Hedge Ineffectiveness
Derivative instruments, gain recognized in other comprehensive income (loss), Effective Portion
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion
Cash deposits
Good Faith and Margin Deposits with Broker-Dealers
Contractual Notional Amount
Derivative, Notional Amount
Unrecognized loss for all outstanding and terminated cash flow hedges included in accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax
Total amount of amortization over the next twelve months for all cash flow hedges
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net
Schedule of Defined Benefit Plans Disclosures [Table]
Schedule of Defined Benefit Plans Disclosures [Table]
Pension Benefits [Member]
Other Postretirement Benefits Plan [Member]
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
Service cost
Defined Benefit Plan, Service Cost
Interest cost
Defined Benefit Plan, Interest Cost
Expected return on assets
Defined Benefit Plan, Expected Return (Loss) on Plan Assets
Recognized actuarial loss
Defined Benefit Plan, Amortization of Gain (Loss)
Settlement loss
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement
Amortization of prior service cost (credit)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)
Net periodic benefit credit
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Any And All Notes [Member]
Any And All Notes [Member]
7.000% Notes due 2019
Surplus Notes [Member]
Surplus Notes [Member]
Surplus Notes [Member]
Senior Revolving Credit Facility [Member]
Revolving Credit Facility [Member]
Senior Subordinated Notes [Member]
Senior Subordinated Notes [Member]
Lines of Credit [Member]
Line of Credit [Member]
Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank Advances [Member]
Extinguishment of Debt [Axis]
Extinguishment of Debt [Axis]
Extinguishment of Debt, Type [Domain]
Extinguishment of Debt, Type [Domain]
Tender Offer November 14, 2017 [Member]
Tender Offer November 14, 2017 [Member]
Tender Offer November 14, 2017 [Member]
Four Point One Zero One Percent Due Two Thousand Twenty Eight [Member]
Four Point One Zero One Percent Due Two Thousand Twenty Eight [Member]
Four Point One Zero One Percent Due Two Thousand Twenty Eight [Member]
Four Point Five Five Zero Percent Due Two Thousand Forty Eight [Member]
Four Point Five Five Zero Percent Due Two Thousand Forty Eight [Member]
Four Point Five Five Zero Percent Due Two Thousand Forty Eight [Member]
One Point Nine Zero Zero Percent Due Two Thousand Twenty Eight [Member]
Other senior unsecured notes [Member]
Other senior unsecured notes [Member]
Other senior unsecured notes [Member]
Commercial Paper Program
Bridge Loan [Member]
Bridge Loan [Member]
Debt instruments, repurchased face amount
Debt Instrument, Repurchased Face Amount
Repayments of Debt
Repayments of Debt
Repurchased Face Amount
Repurchased Face Amount
Debt instrument, repurchased face amount.
Remarketable subordinated notes tendered, cash payment
Early Repayment of Senior Debt
Gain (Loss) on extinguishment of debt
Equity Units Issued
Equity Units Issued 1
Equity Units Issued.
Equity Units, stated value per unit (whole dollars)
Equity Unit Stated Value Per Unit
Equity Unit, stated value per unit.
Debt instrument, face amount
Debt Instrument, Face Amount
Debt Instrument, Interest Rate, Stated Percentage
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate
Equity Units Stock Purchase Contracts Settlement Rate
Equity Units Stock Purchase Contracts Settlement Rate
The number of shares of our common stock issued at settlement for each purchase contract of Equity Units.
Issuance of common stock under Equity Units stock purchase contracts, shares
Stock Issued During Period, Shares, New Issues
Net proceeds from issuance of Equity Units
Proceeds from Issuance of Subordinated Long-term Debt
Federal Home Loan Bank, advances, short-term
Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Rolling Twelve Months
Debt instrument interest rate
Debt Instrument, Interest Rate, Stated Percentage
Bridge facility fees
Loan Processing Fee
Bridge Loan
Bridge Loan
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives
Long-term Debt
Long-term Debt
Senior unsecured notes, principal amount repurchased
Repayments of Unsecured Debt
Number of lines of credit
Number of lines of credit
Number of lines of credit
Maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Short-term borrowings
Commercial paper authorized
Commercial Paper Maximum Borrowing Capacity
Commercial Paper, Maximum Borrowing Capacity
Aggregate principal amount of convertible debentures surrendered for conversion
Debt Conversion Debt Principal Amount
The aggregate principal amount of the original debt instrument that was surrendered for conversion.
Amoritization of bridge facility fees
Interest Expense, Debt
Repayments of Long-term Debt
Equity Units, contract adjustment payment rate
Equity Units Contract Annual Rate
Equity Units, Contract Annual Rate
Derivative Instruments, Gain (Loss) [Table]
Derivatives Embedded In Convertible Fixed Maturity Securities
Embedded Derivative Financial Instruments [Member]
Interest Rate Swaps [Member]
Interest Rate Swap [Member]
Options [Member]
Options Held [Member]
Futures [Member]
Future [Member]
Swaption [Member]
Swaption [Member]
Derivative, Gain (Loss) Recognized
Derivative, Gain (Loss) on Derivative, Net
Available-for-sale fixed maturity securities investments, current, amortized cost
Available-for-sale Debt Securities, Amortized Cost Basis
Available-for-sale fixed maturity securities investments, long-term, amortized cost
Available-for-sale Securities, Debt Maturities, Amortized Cost, Noncurrent
This item represents the noncurrent portion of debt securities grouped by maturity dates, at cost, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any, which are classified neither as held-to-maturity nor trading securities.
Preferred stock, par value
Preferred Stock, Par or Stated Value Per Share
Preferred stock, shares authorized
Preferred Stock, Shares Authorized
Preferred stock, shares issued
Preferred Stock, Shares Issued
Preferred stock, shares outstanding
Preferred Stock, Shares Outstanding
Common stock, par value
Common Stock, Par or Stated Value Per Share
Common stock, shares authorized
Common Stock, Shares Authorized
Common stock, shares issued
Common Stock, Shares, Issued
Common stock, shares outstanding
Common Stock, Shares, Outstanding
Effective tax rate
Effective Income Tax Rate Reconciliation, Percent
Health Insurance Provider Fee, nondeductible expense
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount
Lease Terms [Abstract]
Lease Terms [Abstract]
Lessee, Lease, Description [Table]
Lessee, Lease, Description [Table]
Undiscounted Lease [Axis]
Undiscounted Lease [Axis]
Undiscounted Lease [Axis]
Undiscounted Lease [Domain]
Undiscounted Lease [Domain]
[Domain] for Undiscounted Lease [Axis]
Undiscounted Lease Payments [Member]
Undiscounted Lease Payments [Member]
Undiscounted Lease Payments [Member]
Lessee, Lease, Description [Line Items]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract
Lessee, Operating Lease, Term of Contract
Lessee, Operating Lease, Lease Not Yet Commenced Expense
Lessee, Operating Lease, Lease Not Yet Commenced Expense
Represents undiscounted lease payments.
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract
Lessee, Operating Lease, Lease Not yet Commenced, Description
Lessee, Operating Lease, Lease Not yet Commenced, Description
Lessee, Operating Lease, Renewal Term
Lessee, Operating Lease, Renewal Term
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax
Investments, gross unrealized gains excluding non-credit component of other-than-temporary impairments
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax
Investments, gross unrealized losses excluding non-credit component of other-than-temporary impairments
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax
Investments, net pretax unrealized (losses) gains excluding non-credit component of other-than-temporary impairments
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax
Deferred tax asset (liability)
Available For Sale Securities Accumulated Other Comprehensive Income Net Deferred Tax Liability
-- None. No documentation exists for this element. --
Net unrealized (losses) gains on investments excluding non-credit component of other-than-temporary impairments
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax
Non-credit component of other than temporary impairments on investments, unrealized losses
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities
Non-credit component of other than temporary impairments on investments, deferred tax asset
Available For Sale Securities Other Than Temporary Impairments In Accumulated Other Comprehensive Income Deferred Tax Liability Asset
-- None. No documentation exists for this element. --
Net unrealized non-credit component of other than temporary impairments on investments
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Debt Securities
Cash flow hedges, gross unrealized losses
Unrealized Gain (Loss) on Cash Flow Hedging Instruments
Cash flow hedges, deferred tax asset
Cash Flow Hedging Instruments Accumulated Other Comprehensive Income Net Deferred Tax Asset
-- None. No documentation exists for this element. --
Net unrealized losses on cash flow hedges
Defined benefit pension plans, deferred net actuarial loss
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax
Defined benefit pension plans, deferred prior service credits
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax
Defined benefit pension plans, deferred tax asset
Defined Benefit Plan Accumulated Other Comprehensive Income Net Deferred Tax Asset
Defined Benefit Plan Accumulated Other Comprehensive Income Net Deferred Tax Asset
Net unrecognized periodic benefit costs for defined benefit pension plans
Defined Benefit Plan Accumulated Other Comprehensive Income Adjustments Net Of Tax
Defined Benefit Plan Accumulated Other Comprehensive Income Adjustments Net Of Tax
Postretirement benefit plans, deferred net actuarial loss
Deferred Net Actuarial Gain (Loss) Postretirement Benefits
-- None. No documentation exists for this element. --
Postretirement beneft plans, prior service costs
Deferred Prior Service Cost (Credit) Postretirement Benefit Plans
-- None. No documentation exists for this element. --
Postretirement benefit plans, deferred tax asset
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits
Net unrecognized periodic benefit costs for postretirement benefit plans
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax
Foreign currency translation adjustments, gross unrealized losses
Accumulated Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Before Tax
-- None. No documentation exists for this element. --
Foreign currency translation adjustments, deferred tax asset
Deferred Tax Assets, Unrealized Currency Losses
Net unrealized losses on foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax
Accumulated other comprehensive loss
Basis of Presentation and Significant Accounting Policies
Basis of Presentation and Significant Accounting Policies [Text Block]
Summary of Aggregate Contractual Or Notional Amounts And Estimated Fair Values
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Summary Of Outstanding Fair Value Hedges
Schedule of Derivative Instruments [Table Text Block]
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Income Statement Relationship of Fair Value and Cash Flow Hedging
Income Statement Relationship of Fair Value and Cash Flow Hedging [Table Text Block]
Income Statement Relationship of Fair Value and Cash Flow Hedging [Table Text Block]
Effect Of Non-Hedging Derivatives On Income Statement And Included In Net Realized Gains (Losses) On Investments)
Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]
Carrying Value Of Long-Term Debt
Schedule of Debt [Table Text Block]
Convertible Debenture Terms
Convertible Debt [Table Text Block]
Operating Lease Liabilities
Operating Lease, Liability
Cumulative effect of new accounting principle in period of adoption
Cumulative Effect of New Accounting Principle in Period of Adoption
Customer funds and cash and cash equivalents on deposit for regulatory requirements
Restricted Cash and Investments, Current
Premiums Receivable, Gross
Premiums Receivable, Gross
Approximate percentage of revenues subject to new revenue guidance under ASC 606
Percentage of revenues subject to new revenue guidance under ASC 606
Approximate percentage of revenues subject to new revenue guidance under ASC 606.
Adoption of ASU 2018-02
Reclassification of stranded tax effects resulting from the Tax Cuts and Jobs Act
Reclassification from accumulated other comprehensive loss to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act.
Adoption of new accounting pronouncement, tax benefit, amount
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount
Reportable segments operating gain
Operating Income (Loss)
Other-than-temporary impairment losses recognized in income
Interest expense
Amortization of other intangible assets
Gain (loss) on Extinguishment of Debt
Income before income tax expense
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Net holding gain (loss) on investment securities arising during the period, net of tax
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax
Reclassification adjustment for net realized loss (gain) on investment securities, net of tax
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax
Total reclassification adjustment on investments
Non-credit component of other-than-temporary impairments on investments, net of tax
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Period Increase (Decrease)
Cash flow hedges, holding gain (loss), net of tax
Net change in unrecognized periodic benefit costs for defined benefit pension and postretirement benefit plans, net of tax
Foreign currency translation adjustment, net of tax
Net gain (loss) recognized in other comprehensive income, net of tax
Other Comprehensive Income (Loss), Net of Tax
Leases (Reconciliation of Future Lease Payments to Total Lease Liabilities) [Abstract]
Reconciliation of future lease payments to total lease liabilities.
Operating lease payments, 2019; excluding three months ended March 31, 2019
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months
Operating lease payments, 2020
Lessee, Operating Lease, Liability, Payments, Due Year Two
Operating lease payments, 2021
Lessee, Operating Lease, Liability, Payments, Due Year Three
Operating lease payments, 2022
Lessee, Operating Lease, Liability, Payments, Due Year Four
Operating lease payments, 2023
Lessee, Operating Lease, Liability, Payments, Due Year Five
Operating lease payments, Thereafter
Lessee, Operating Lease, Liability, Payments, Due after Year Five
Total future minimum payments
Lessee, Operating Lease, Liability, Payments, Due
Imputed Interest, Leases
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Investments, Securities Lending Programs [Abstract]
Investments, Securities Lending Programs [Abstract]
Securities Lending Programs [Table]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table]
Repurchase Agreements and Similar Transactions, Maturity Periods [Axis]
Repurchase Agreements and Similar Transactions, Maturity Periods [Axis]
Repurchase Agreements and Similar Transactions, Maturity Periods [Domain]
Repurchase Agreements and Similar Transactions, Maturity Periods [Domain]
Overnight and Continuous [Member]
Maturity Overnight [Member]
Less than 30 Days [Member]
Maturity Less than 30 Days [Member]
30 to 90 Days [Member]
Maturity 30 to 90 Days [Member]
Greater than 90 Days [Member]
Maturity Greater than 90 Days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Collateral received for securities loaned, at carrying value
Fair Value
Fair Value Disclosures [Text Block]
Statement of Stockholders' Equity [Abstract]
Statement, Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Common Stock [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
AOCI Attributable to Parent [Member]
Balance
Balance (in shares)
Shares, Outstanding
Adjusted beginning balance
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)
Premiums for and settlement of equity options
NetAdjustmentToAdditionalPaidInCapitalForEquityHedge
Net adjustment to additional paid-in capital resulting from the premium (cost) or settlement of an equity hedge.
Issuance of common stock under Equity Units stock purchase contracts
Stock Issued During Period, Value, New Issues
Repurchase and retirement of common stock, value
Repurchase and retirement of common stock, shares
Dividends and dividend equivalents
Dividends, Common Stock
Issuance of common stock under employee stock plans, net of related tax benefits
Stock Issued During Period, Value, Stock Options Exercised
Issuance of common stock under employee stock plans, net of related tax benefits, Shares
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures
Convertible debenture repurchases and conversions
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments
Adoption of ASU 2018-02 (Note 2)
Equity Units issuance costs adjustment
Present Value Of Contract Liability Debt Issuance Costs Related To Equity Units
Represents the amount offset to additional paid-in-capital for the debt issuance costs and the present value of the contract liability related to the Equity Units.
Balance
Balance (in shares)
Weighted average shares excluded from denominator for diluted earnings per share because the stock options were anti-dilutive
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Issuance of common stock under Equity Units stock purchase contracts
Restricted stock units issued under stock incentive plan
Restricted stock units excluded from the denominator for diluted earnings per share
Potentially Dilutive Restricted Stock Units Contingent On Operating Results
Potentially Dilutive Restricted Stock Units Contingent On Operating Results
Risk-free interest rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Volatility factor
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Quarterly dividend yield
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Weighted-average expected life (years)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term
Components of Net Periodic (Benefit Credit) Benefit Cost
Schedule of Net Benefit Costs [Table Text Block]
Reportable segments operating revenues
Declaration date
Dividends Payable, Date Declared
Record date
Payment date
Cash dividends per share
Common Stock, Dividends, Per Share, Cash Paid
Total payment
Insurance [Abstract]
Short-duration Insurance Contracts, Claims Development [Table]
Short-duration Insurance Contracts, Claims Development [Table]
Short-duration Insurance Contracts, Claim Year [Axis]
Short-duration Insurance Contracts, Accident Year [Axis]
Short-duration Insurance Contracts, Claim Year [Domain]
Short-duration Insurance Contracts, Accident Year [Domain]
Short-duration Insurance Contracts, Claim Year 2019 [Member]
Short-duration Insurance Contracts, Claim Year 2018 [Member]
Short-duration Insurance Contracts, Claim Year 2018 [Member]
Short-duration Insurance Contracts, Claim Year 2018 [Member]
Short-duration Insurance Contracts, Accident Year 2017 [Member]
Short-duration Insurance Contracts, Claim Year 2017 and Prior [Member]
Short-duration Insurance Contracts, Accident Year 2016 [Member]
Claims Development [Line Items]
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net
Medical Claims Payable (Reconciliation of Net Incurred Medical Claims to Benefit Expense) [Abstract]
Medical Claims Payable (Reconciliation of Net Incurred Medical Claims to Benefit Expense) [Abstract]
Reconciliation of Net Incurred Medical Claims to Benefit Expense [Table]
Reconciliation of Net Incurred Medical Claims to Benefit Expense [Table]
Reconciliation of net incurred medical claims to benefit expense [Table]
Reconciliation of net incurred medical claims to benefit expense [Line Items]
reconciliation of net incurred medical claims to benefit expense [Line Items]
[Line Items] for Reconciliation of net incurred medical claims to benefit expense [Table]
Quality improvement and other claims expense
Supplementary Insurance Information, Other Operating Expense
Retirement Benefits
Pension and Other Postretirement Benefits Disclosure [Text Block]
Leases
Leases of Lessee Disclosure [Text Block]
Derivative [Table]
Derivative [Table]
Interest Rate Swaps [Member]
Designated as Hedging Instrument [Member]
2018 [Member]
Two Thousand Eighteen [Member]
Two Thousand Eighteen
2017 [Member]
Two Thousand Seventeen [Member]
Two Thousand Seventeen [Member]
2015 [Member]
Two Thousand Fifteen [Member]
Two Thousand Fifteen [Member]
2014 [Member]
Two Thousand Fourteen [Member]
Two Thousand Fourteen [Member]
2013 [Member]
Two Thousand Thirteen [Member]
Two Thousand Thirteen [Member]
2012 [Member]
Two Thousand Twelve [Member]
Two Thousand Twelve [Member]
Interest Rate Received Four Point One Zero One Percentage [Member]
Interest Rate Received Four Point One Zero One Percentage [Member]
Interest Rate Received Four Point One Zero One Percentage
Interest Rate Received 3.300% [Member]
Interest Rate Received Three Point Three Zero Percentage [Member]
Interest Rate Received Three Point Three Zero Percentage
Interest Rate Received 4.350% [Member]
Interest Rate Received Four Point Three Five Percentage [Member]
-- None. No documentation exists for this element. --
Interest Rate Received 1.875% [Member]
Interest Rate Received One Point Eight Seven Five Percentage [Member]
-- None. No documentation exists for this element. --
Energy [Axis]
Energy [Axis]
Energy [Domain]
Energy [Domain]
Derivative [Line Items]
Derivative [Line Items]
Derivative, Fixed Interest Rate
Derivative, Fixed Interest Rate
Investment Options, Expiration Date
Investment Options, Expiration Date
Segment Information
Segment Reporting Disclosure [Text Block]
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Government Business [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Operating gain (loss)
Reconciliation Of The Beginning And Ending Balances For Medical Claims Payable
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]
Reconciliation of Net Incurred Medical Claims to Benefit Expense
Reconciliation of Net Incurred Medical Claims to Benefit Expense [Table Text Block]
Tabular Disclosure For Reconciliation of Net Incurred Medical Claims to Benefit Expense.
Reconciliation of Short Duration Medical Claims Payable to the Consolidated Medical Claims Payable
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table Text Block]
Accumulated Other Comprehensive Income (Loss) Reclassification Adjustments (Parantheticals) [Abstract]
Accumulated Other Comprehensive Income (Loss) Reclassification Adjustments (Parantheticals) [Abstract]
Net holding gain (loss) on investment securities arising during the period, tax (expense) benefit
Available-for-sale Securities, Income Tax Expense on Change in Unrealized Holding Gain (Loss)
Reclassification adjustment for net realized loss (gain) on investment securities, tax (benefit) expense
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax
Cash flow hedges, holding gain (loss), tax (expense) benefit
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax
Net change in unrecognized periodic benefit costs for defined benefit pension and postretirement benefit plans, tax expense
Other Net Change In Unrecognized Periodic Benefit Costs For Defined Benefit Pension And Postretirement Benefit Plans Tax Benefit Expense
-- None. No documentation exists for this element. --
Net gain (loss) recognized in other comprehensive income, tax (expense) benefit
Other Comprehensive Income (Loss), Tax
Financial Data By Reportable Segment
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Revenue from External Customers by Products and Services [Table Text Block]
Revenue from External Customers by Products and Services [Table Text Block]
Reconciliation Of Reportable Segments Operating Revenues To Total Revenues Reported In The Consolidated Statements Of Income
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
Reconciliation Of Reportable Segments Operating Gain To Income Before Income Tax Expense Included In The Consolidated Statements Of Income
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]
Lessee, Operating Lease, Disclosure [Table Text Block]
Lessee, Operating Lease, Disclosure [Table Text Block]
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Current and Long-Term Investments, Available-For-Sale
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
Aggregate Fair Value and Gross Unrealized Loss of Fixed Maturity Securities in an Unrealized Loss Position
Schedule of Unrealized Loss on Investments [Table Text Block]
Amortized Cost and Fair Value of Fixed Maturity Securities, By Contractual Maturity
Investments Classified by Contractual Maturity Date [Table Text Block]
Proceeds and Realized Gains and Losses from Investments
Schedule of Realized Gain (Loss) [Table Text Block]
Investments In Equity Securities
Investments in equity securities [Table Text Block]
Investments in equity securities [Table Text Block]
Gains (Losses) Related to Equity Securities
Gains (Losses) Related to Equity Securities [Table Text Block]
Gains (Losses) Related to Equity Securities [Table Text Block]
Securities Lending Programs
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table Text Block]
Hedging Instrument [Member]
Derivative Instrument Risk [Axis]
Derivative Contract Type [Domain]
Forward Contracts [Member]
Forward Contracts [Member]
Total derivative assets
Derivative Asset, Fair Value, Gross Asset
Amounts netted
Derivative Asset, Fair Value, Gross Liability
Net derivative assets
Derivative Asset, Fair Value, Amount Not Offset Against Collateral
Total derivative liabilities
Derivative Liability, Fair Value, Gross Liability
Amounts netted
Derivative Liability, Fair Value, Gross Asset
Net derivative liabilities
Derivative Liability, Fair Value, Amount Not Offset Against Collateral
Commitments And Contingencies
Commitments and Contingencies Disclosure [Text Block]