Fair Value Disclosures [Abstract]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Business Segments [Axis]
Segment [Domain]
Aarp Program [Member]
AARP Program Member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Assets and Liabilities, Measured at Fair Value Recurring Basis [Table Text Block]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Fair Value Measurements, Nonrecurring [Table Text Block]
Fair Value Measurements, Nonrecurring [Table Text Block]
Reconciliation of Assets Measured at Fair Value on a Recurring Basis Using Level 3 Inputs [Table Text Block]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
Statement [Table]
Scenario [Axis]
Scenario [Axis]
Scenario, Unspecified [Domain]
Scenario, Unspecified [Domain]
Statement [Line Items]
Statement [Line Items]
Net earnings
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Other comprehensive (loss) income:
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Gross unrealized holding (losses) gains on investment securities during the period
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax
Income tax effect
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax
Total unrealized (losses) gains, net of tax
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax
Gross reclassification adjustment for net realized gains included in net earnings
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, before Tax
Income tax effect
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax
Total reclassification adjustment, net of tax
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax
Total foreign currency translation gains
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax
Other comprehensive loss
Other Comprehensive Income (Loss), Net of Tax
Comprehensive income
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Less: comprehensive income attributable to noncontrolling interests
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest
Comprehensive income attributable to UnitedHealth Group common shareholders
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Accounting Policies [Abstract]
Use of Estimates [Policy Text Block]
Use of Estimates, Policy [Policy Text Block]
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Investments [Abstract]
Schedule of Investments [Table]
Schedule of Investments [Table]
Investment Type [Axis]
Investment Type [Axis]
Investment Type [Domain]
Summary of Investments, by Type [Domain]
Available-for-sale Securities [Member]
Available-for-sale Securities [Member]
Held-to-maturity Securities [Member]
Held-to-maturity Securities [Member]
Major Types of Debt and Equity Securities [Axis]
Major Types of Debt and Equity Securities [Axis]
Major Types of Debt and Equity Securities [Domain]
Major Types of Debt and Equity Securities [Domain]
Debt Securities [Member]
U.S. Government and Agency Obligations [Member]
US Treasury and Government [Member]
State and Municipal Obligations [Member]
US States and Political Subdivisions Debt Securities [Member]
Corporate Obligations [Member]
Corporate Debt Securities [Member]
Non-U.S. Agency Mortgage-Backed Securities [Member]
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Equity Securities [Member]
Available-for-sale securities, Amortized Cost
Available-for-sale Securities, Amortized Cost Basis
Available-for-sale securities, Gross Unrealized Gains
Available-for-sale Securities, Gross Unrealized Gains
Available-for-sale securities, Gross Unrealized Losses
Available-for-sale Securities, Gross Unrealized Losses
Available-for-sale Securities
Available-for-sale Securities, Fair Value Disclosure
Held-to-maturity securities, Amortized Cost
Held-to-maturity Securities
Held-to-maturity securities, Gross Unrealized Gains
Held-to-maturity Securities, Unrecognized Holding Gain
Held-to-maturity securities, Gross Unrealized Losses
Held-to-maturity Securities, Unrecognized Holding Loss
Held-to-maturity securities, Fair Value
Held-to-maturity Securities, Fair Value
Total investments, Amortized Cost
Investments, Amortized Cost
Investments at amortized cost.
Total investments, Gross Unrealized Gains
Investments, Gross Unrealized Gains
Gross unrealized gains of investments.
Total investments: Gross Unrealized Losses
Investments, Gross Unrealized Losses
Gross unrealized losses of investments.
Investments, Fair Value Disclosure
Investments, Fair Value Disclosure
Fair Value Measurements, Recurring and Nonrecurring [Table]
Measurement Frequency [Axis]
Fair Value, Measurement Frequency [Domain]
Fair Value, Measurements, Recurring [Member]
Business Segments [Axis]
Segment [Domain]
AARP Program [Member]
Fair Value, Assets Measured on Recurring Basis, Disclosure Items [Axis]
Fair Value, Hierarchy [Axis]
Fair Value, Assets Measured on Recurring Basis, Disclosure Items [Domain]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Quoted Prices in Active Markets (Level 1) [Member]
Fair Value, Inputs, Level 1 [Member]
Other Observable Inputs (Level 2) [Member]
Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents
Cash and Cash Equivalents, Fair Value Disclosure
Available-for-sale Securities
Total assets at fair value
Assets, Fair Value Disclosure, Recurring
Other liabilities
Liabilities, Fair Value Disclosure
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Maximum [Member]
Maximum [Member]
Minimum [Member]
Minimum [Member]
Award Type [Axis]
Award Type [Axis]
Award Type [Domain]
Award Type [Domain]
Restricted Stock Units (RSUs) [Member]
Stock Option [Member]
Stock Option [Member]
Shares available for future grants
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant
Medical Costs and Medical Costs Payable [Abstract]
Medical Costs And Medical Costs Payable [Abstract]
Medical Costs and Medical Costs Payable [Text Block]
Medical Costs Medical Costs Payable Disclosure Text Block
Disclosure of medical costs and medical costs payables including estimates of obligations for medical care services that have been rendered on behalf of insured consumers but for which claims have not yet been received or processed, and for liabilities for physician, hospital and other medical cost disputes.
Investments [Text Block]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Medicare Part D Pharmacy Benefit Contracts [Abstract]
Medicare Part D Pharmacy Benefit Contracts [Abstract]
Statement [Table]
Schedule of Other Current Receivables and Other Policy Liabilities Associated with Medicare Part D Program [Table Text Block]
Schedule of Other Current Receivables and Other Policy Liabilities Associated with Medicare Part D Program [Table Text Block]
Schedule of other current receivables and other policy liabilities associated with Medicare Part D program.
Medicare Part D Pharmacy Benefits Contract [Text Block]
Medicare Part D Pharmacy Benefits Contract [Text Block]
Medicare Part D Pharmacy Benefits Contract [Text Block]
Credit Derivatives by Payment and Performance Risk (Credit Rating) [Axis]
Credit Rating [Axis]
Credit Rating [Domain]
Credit Rating [Domain]
AAA [Member]
Aaa Credit Rating [Member]
AAA Credit Rating [Member]
AA [Member]
AA [Member]
A [Member]
A [Member]
A [Member]
Non-Investment Grade [Member]
External Credit Rating, Non Investment Grade [Member]
Securities by Origination [Axis]
Securities by Origination [Axis]
Securities by Origination [Axis]
Securities by Origination [Domain]
Securities by Origination [Domain]
Securities by Origination [Domain]
2013 [Member]
Two Thousand Thirteen [Member]
Two Thousand Thirteen [Member]
2012 [Member]
Two Thousand Twelve [Member]
Two Thousand Twelve [Member]
2011 [Member]
Two Thousand Eleven [Member]
Origination In 2011 [Member]
2010 [Member]
Two Thousand Ten [Member]
Origination in 2010 [Member]
2009 [Member]
Two Thousand Nine [Member]
Two Thousand Nine [Member]
2007 [Member]
Origination in 2007 [Member]
Origination in 2007 [Member]
Pre 2007[Member]
Pre Two Thousand Seven [Member]
Pre Two Thousand Seven [Member]
Mortgage-backed securities
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure
Fair Value of Financial Instruments, Policy [Policy Text Block]
Fair Value of Financial Instruments, Policy [Policy Text Block]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Senior Notes [Member]
Senior Notes [Member]
Debt Security [Axis]
Debt Security [Axis]
Major Types of Debt Securities [Domain]
Major Types of Debt Securities [Domain]
Debt Securities [Member]
Measurement Frequency [Axis]
Fair Value, Measurement Frequency [Domain]
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Measurements, Nonrecurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Unobservable Inputs (Level 3) [Member]
Fair Value, Inputs, Level 3 [Member]
Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis]
Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis]
Fair Value, Disclosure Item Amounts [Domain]
Fair Value, Disclosure Item Amounts [Domain]
Debt securities - held-to-maturity
Debt Instrument, Fair Value Disclosure
Debt Instrument, Fair Value Disclosure
Plan Name [Axis]
Plan Name [Axis]
Plan Name [Domain]
Plan Name [Domain]
Class of Stock [Axis]
Class of Stock [Axis]
Class of Stock [Domain]
Class of Stock [Domain]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at the beginning of the period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number
Granted, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures
Exercised, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Forfeited, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period
Outstanding at the end of the period
Exercisable at end of period, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number
Vested and expected to vest end of period, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number
Outstanding at beginning of period, Weighted-Average Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Granted, Weighted-Average Exercise Price
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Exercised, Weighted-Average Exercise Price
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Forfeited, Weighted-Average Exercise Price
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 Exercise Price
Exercisable at end of period, Weighted-Average Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price
Vested and expected to vest end of period, Weighted-Average Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price
Outstanding at end of period, Weighted Average Remaining Contractual Term (in years)
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 Term (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term
Vested and expected to vest end of period, Weighted Average Remaining Contractual Term (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, 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, Exercisable, Intrinsic Value
Vested and expected to vest end of period, Aggregate Intrinsic Value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value
Stock Option and SAR Activity [Table Text Block]
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Restricted Share Activity [Table Text Block]
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
Other Share-Based Compensation Data [Table Text Block]
Schedule of Share-based Compensation, Activity [Table Text Block]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Basis of Presentation [Text Block]
Basis of Presentation and Significant Accounting Policies [Text Block]
Venture Capital Funds [Member]
Venture Capital Funds [Member]
Valuation Technique [Axis]
Valuation Technique [Axis]
Valuation Technique [Domain]
Valuation Technique [Domain]
Market Approach Valuation Technique [Member]
Market Approach Valuation Technique [Member]
Market Approach [Axis]
Market Approach [Axis]
Market Approach [Axis]
Market Approach [Domain]
Market Approach [Domain]
Market Approach [Domain]
Comparable Companies [Member]
Comparable Companies [Member]
Comparable Companies [Member]
Recent Transactions [Member]
Recent Transactions [Member]
Recent Transactions [Member]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple
Fair Value Inputs, Revenue Multiple
Fair Value Inputs, Revenue Multiple
Segment Reporting [Abstract]
Segment Reporting, Policy [Policy Text Block]
Segment Reporting, Policy [Policy Text Block]
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]
Commitments and Contingencies Disclosure [Text Block]
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Credit Facility Name [Axis]
Credit Facility Name [Axis]
Credit Facility Name [Axis]
Credit Facility Name [Domain]
Credit Facility Name [Domain]
[Domain] for Credit Facility Name [Axis]
Five Year $3.0 Billion Credit Facility [Member]
Five Year $3.0 Billion Credit Facility [Member]
Five Year $3.0 Billion Credit Facility [Member]
364 Day $1.0 Billion Credit Facility [Member]
364 Day $1.0 Billion Credit Facility [Member]
364 Day $1.0 Billion Credit Facility [Member]
Short-term Debt, Type [Axis]
Short-term Debt, Type [Axis]
Short-term Debt, Type [Domain]
Short-term Debt, Type [Domain]
Commercial Paper [Member]
Commercial Paper [Member]
Derivative Instrument Risk [Axis]
Derivative Instrument Risk [Axis]
Derivative Contract Type [Domain]
Derivative Contract Type [Domain]
Interest Rate Contract [Member]
Interest Rate Contract [Member]
Currency Swap [Member]
Currency Swap [Member]
Range [Member]
Credit Facility [Axis]
Credit Facility [Axis]
Credit Facility [Domain]
Credit Facility [Domain]
Revolving Credit Facility [Member]
Revolving Credit Facility [Member]
Five-year revolving bank credit facility, Amount Outstanding
Line of Credit Facility, Amount Outstanding
Short-term Debt, Weighted Average Interest Rate
Short-term Debt, Weighted Average Interest Rate
Line of Credit, Credit Facility, Maximum Borrowing Capacity
Line of Credit Facility, Maximum Borrowing Capacity
Debt Instrument, Interest Rate During Period
Debt Instrument, Interest Rate During Period
Number Of Years Of Revolving Bank Credit
Number Of Years Of Revolving Bank Credit
Credit Facility, Number of Days
Credit Facility, Number of Days
Credit Facility, Number of Days
Number of banks that comprise revolving bank credit facility (banks)
Number Of Banks That Comprise Revolving Bank Credit Facility
Number Of Banks That Comprise Revolving Bank Credit Facility
Maximum percentage of indebtedness to total net capital bank covenant
Maximum Percentage Of Indebtedness To Total Net Capital Bank Covenant
Maximum percentage of indebtedness to total net capital bank covenant
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net
Derivative, Fair Value, Net
Notional Amount of Interest Rate Derivatives
Notional Amount of Interest Rate Fair Value Hedge Derivatives
Interest Rate Derivative Assets, at Fair Value
Interest Rate Derivative Assets, at Fair Value
Interest Rate Derivative Liabilities, at Fair Value
Interest Rate Derivative Liabilities, at Fair Value
Notional Amount of Foreign Currency Derivatives
Notional Amount of Cash Flow Hedge Instruments
Foreign Currency Contracts, Liability, Fair Value Disclosure
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value
Mortgage Backed Securities [Member]
Collateralized Mortgage Backed Securities [Member]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions
Total number of security positions
Total number of security positions
Total number of security positions
Percentage Of Unrealized Losses
Percentage Of Unrealized Losses
Percentage Of Unrealized Losses
Statement of Stockholders' Equity [Abstract]
Stockholders' Equity, Total [Member]
Stockholders' Equity, Total [Member]
Foreign Currency Translation Losses [Axis]
Foreign Currency Translation Losses [Axis]
Foreign Currency Translation Losses [Axis]
Foreign Currency Translation Gains (Losses) [Domain]
Foreign Currency Translation Gains (Losses) [Domain]
Foreign Currency Translation Gains (Losses) [Domain]
Foreign Currency Gain (Loss) [Member]
Foreign Currency Gain (Loss) [Member]
Net Unrealized Gains (Losses) on Investments [Axis]
Net Unrealized Gains (Losses) on Investments [Axis]
Net Unrealized Gains (Losses) on Investments [Axis]
Net Unrealized Gains on Investments [Domain]
Net Unrealized Gains on Investments [Domain]
Net Unrealized Gains on Investments [Domain]
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Equity Components [Axis]
Equity Components [Axis]
Total Shareholders' Equity [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 Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance
Stockholders' Equity Attributable to Parent
Balance (in shares)
Common Stock, Shares, Outstanding
Net earnings attributable to UnitedHealth Group common shareholders
Net Income (Loss) Attributable to Parent
Other Comprehensive Income (Loss)
Foreign currency translation gains
Other Comprehensive Income (Loss), Net of Tax
Issuances of common stock, and related tax benefits (in shares)
Stock Issued During Period, Shares, New Issues
Issuances of common stock, and related tax benefits
Stock Issued During Period, Value, New Issues
Common stock repurchases (in shares)
Stock Repurchased During Period, Shares
Common stock repurchases
Stock Repurchased During Period, Value
Share-based compensation, and related tax benefits
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures
Common stock dividends
Dividends, Cash
Balance (in shares)
Balance
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
UnitedHealthcare [Member]
Unitedhealthcare [Member]
UnitedHealthcare [Member]
Total Optum [Member]
Total Optum [Member]
Optum [Member]
OptumHealth [Member]
Optumhealth [Member]
OptumHealth Member
OptumInsight [Member]
Optuminsight [Member]
OptumInsight [Member]
OptumRx [Member]
Optumrx [Member]
OptumRx [Member]
Corporate and Intersegment Eliminations [Member]
Intersegment Elimination [Member]
Premiums, revenues - external customers
Premiums Earned, Net
Services, revenues - external customers
Sales Revenue, Services, Net
Products, revenues - external customers
Sales Revenue, Goods, Net
Total revenues - external customers
Revenue from External Customers
Total revenues - intersegment
Segment Reporting Information, Intersegment Revenue
Investment and other income
Investment Income, Interest and Dividend
Total revenues
Revenues
Earnings from operations
Operating Income (Loss)
Interest expense
Interest Expense
Earnings before income taxes
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest
Condensed Consolidated Balance Sheet (Parantheticals) [Abstract]
Condensed Consolidated Balance Sheet (Parantheticals) [Abstract]
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
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
Percentage of total assets at fair value
Cash Cash Equivalents Available For Sale Securities And Interest Rate Swap Assets As A Percentage Of Total Assets
Percentage of total fair value
Derivative Financial Instruments, Liabilities, Fair Value Disclosure
Derivative Financial Instruments, Liabilities, Fair Value Disclosure
Interest rate swap liabilities
4.875% Senior Unsecured Notes Due February 2013 [Member]
Four point eight seven five Senior Unsecured Notes due Februrary 2013 [Member]
Four point eight seven five Senior Unsecured Notes due Februrary 2013 [Member]
4.875% Senior Unsecured Notes Due April 2013 [Member]
Four point eight seven five percent Senior Unsecured Notes due April 2013 [Member]
Four point eight seven five percent Senior Unsecured Notes due April 2013 [Member]
4.750% Senior Unsecured Notes Due February 2014 [Member]
Four point seven five Senior Unsecured Notes due Februray 2014 [Member]
Four point seven five Senior Unsecured Notes due Februray 2014 [Member]
5.000% Senior Unsecured Notes Due August 2014 [Member]
Five percent Senior Unsecured Notes due August 2014 [Member]
Five percent Senior Unsecured Notes due August 2014 [Member]
Senior Unsecured Floating-rate Notes Due August 2014 [Member]
Senior Unsecured Floating-rate Notes Due August 2014 [Member]
Senior Unsecured Floating-rate Notes Due August 2014 [Member]
4.875% Senior Unsecured Notes Due March 2015 [Member]
Four point eight seven five percent Senior Unsecured Notes due March 2015 [Member]
Four point eight seven five percent Senior Unsecured Notes due March 2015 [Member]
0.850% Senior Unsecured Notes due October 2015 [Member]
0.850% Senior Unsecured Notes due October 2015 [Member]
0.850% Senior Unsecured Notes due October 2015 [Member]
5.375% Senior Unsecured Notes Due March 2016 [Member]
Five point three seven five percent Senior Unsecured Notes due March 2016 [Member]
Five point three seven five percent Senior Unsecured Notes due March 2016 [Member]
1.875% of Senior Unsecured Notes Due November 2016 [Member]
One point eight seven five percent Senior Unsecured Notes due November 2016 [Member]
One point eight seven five percent Senior Unsecured Notes due November 2016 [Member]
5.360% Senior Unsecured Notes Due November 2016 [Member]
Five point three six percent Senior Unsecured Notes due November 2016 [Member]
Five point three six percent Senior Unsecured Notes due November 2016 [Member]
6.000% Senior Unsecured Notes Due June 2017 [Member]
Six Percent Senior Unsecured Notes Due June Two Thousand Seventeen [Member]
Senior Unsecured Notes 6.0 Percent Due June 2017 [Member]
1.400% Senior Unsecured Notes due October 2017 [Member]
1.400% Senior Unsecured Notes due October 2017 [Member]
1.400% Senior Unsecured Notes due October 2017 [Member]
6.000% Senior Unsecured Notes Due November 2017 [Member]
Six Point Zero Percent Senior Unsecured Notes Due November 2017 [Member]
Senior Unsecured Notes 6.0 Percent Due November 2017 [Member]
6.000% Senior Unsecured Notes Due February 2018 [Member]
Six Point Zero Senior Unsecured Notes Due February Two Thousand Eighteen [Member]
Senior Unsecured Notes 6.0 Percent Due February 2018 [Member]
1.625% Senior Unsecured Notes Due March 2019 [Member]
1.625% Senior Unsecured Notes Due March 2019 [Member]
1.625% Senior Unsecured Notes Due March 2019 [Member]
3.875% Senior Unsecured Notes Due October 2020 [Member]
Three point eight seven five percent Senior Unsecured Notes due October 2020 [Member]
Three point eight seven five percent Senior Unsecured Notes due October 2020 [Member]
4.700% Senior Unsecured Notes Due February 2021 [Member]
Four Point Seven Percentage Senior Unsecured Notes Due February Two Thousand Twenty One [Member]
Four Point Seven Percentage of Senior Unsecured Notes Due February Two Thousand and Twenty One [Member]
3.375% of Senior Unsecured Notes Due November 2021 [Member]
Three point three seven five percent Senior Unsecured Notes due November 2021 [Member]
Three point three seven five percent Senior Unsecured Notes due November 2021 [Member]
2.875% of Senior Unsecured Notes Due March 2022 [Member]
Two point eight seven five Senior Unsecured Notes due March 2022 [Member]
Two point eight seven five Senior Unsecured Notes due March 2022 [Member]
Zero Coupon Senior Unsecured Notes Due November 2022 [Member]
Zero Coupon Senior Unsecured Notes Due November Two Thousand Twenty Two [Member]
Senior Unsecured Notes Zero Coupon Due November 2022 [Member]
2.750% Senior Unsecured Notes due February 2023 [Member]
2.750% Senior Unsecured Notes due February 2023 [Member]
2.750% Senior Unsecured Notes due February 2023 [Member]
2.875% Senior Unsecured Notes due March 2023 [Member]
2.875% Senior Unsecured Notes due March 2023 [Member]
2.875% Senior Unsecured Notes due March 2023 [Member]
5.800% Senior Unsecured Notes Due March 2036 [Member]
Five Point Eight Percent Senior Unsecured Notes Due March Two Thousand Thirty Six [Member]
Senior Unsecured Notes 5.8 Percent Due March 2036 [Member]
6.500% Senior Unsecured Notes Due June 2037 [Member]
Six Point Five Percent Senior Unsecured Notes Due June Two Thousand Thirty Seven [Member]
Senior Unsecured Notes 6.5 Percent Due June 2037 [Member]
6.625% Senior Unsecured Notes Due November 2037 [Member]
six point six two five percent Senior Unsecured Notes due November 2037 [Member]
six point six two five percent Senior Unsecured Notes due November 2037 [Member]
6.875% Senior Unsecured Notes Due February 2038 [Member]
Six point eight seven five percent Senior Unsecured Notes due Februray 2038 [Member]
Six point eight seven five percent Senior Unsecured Notes due Februray 2038 [Member]
5.700% Senior Unsecured Notes Due October 2040 [Member]
Five Point Seven Percent Senior Unsecured Notes Due October Two Thousand Forty [Member]
Five Point Seven Percentage of Senior Unsecured Notes Due October Two Thousand and Forty [Member]
5.950% Senior Unsecured Notes Due February 2041 [Member]
Five point nine five Senior Unsecured Notes due Februrary 2041 [Member]
Five point nine five Senior Unsecured Notes due Februrary 2041 [Member]
4.625% of Senior Unsecured Notes Due November 2041 [Member]
Four point six two five percent senior unsecured notes due November 2041 [Member]
Four point six two five percent senior unsecured notes due November 2041 [Member]
4.375% of Senior Unsecured Notes Due March 2042 [Member]
Four point three seven five percent Senior Unsecured Notes due March 2042 [Member]
Four point three seven five percent Senior Unsecured Notes due March 2042 [Member]
3.950% Senior Unsecured Notes due October 2042 [Member]
3.950% Senior Unsecured Notes due October 2042 [Member]
3.950% Senior Unsecured Notes due October 2042 [Member]
4.250% Senior Unsecured Notes due March 2043 [Member]
4.250% Senior Unsecured Notes due March 2043 [Member]
4.250% Senior Unsecured Notes due March 2043 [Member]
Domestic Corporate Debt Securities [Member]
Domestic Corporate Debt Securities [Member]
CDI and 1.3% Subsidiary Floating debt due October 2013 [Member]
CDI and 1.3% Subsidiary Floating debt due October 2013 [Member]
CDI and 1.3% Subsidiary Floating debt due October 2013 [Member]
CDI and 1.45 % Subsidiary floating debt due October 2014 [Member]
CDI and 1.45 % Subsidiary floating debt due October 2014 [Member]
CDI and 1.45 % Subsidiary floating debt due October 2014 [Member]
110% CDI Subsidiary floating debt due December 2014 [Member]
110% CDI Subsidiary floating debt due December 2014 [Member]
110% CDI Subsidiary floating debt due December 2014 [Member]
CDI and 1.6% Subsidiary floating debt due October 2015 [Member]
CDI and 1.6% Subsidiary floating debt due October 2015 [Member]
CDI and 1.6% Subsidiary floating debt due October 2015 [Member]
IPCA and 7.61% Subsidiary floating debt due October 2015 [Member]
IPCA and 7.61% Subsidiary floating debt due October 2015 [Member]
IPCA and 7.61% Subsidiary floating debt due October 2015 [Member]
Foreign Corporate Debt Securities [Member]
Foreign Corporate Debt Securities [Member]
Debt Instrument, Interest Rate, Stated Percentage
Debt Instrument, Interest Rate, Stated Percentage
Debt Instrument, Floating Interest Rate, Stated Percentage
Debt Instrument, Basis Spread on Variable Rate
Par Value
Debt Instrument, Face Amount
Commercial Paper
Commercial Paper
Carrying Value
Long-term Debt, Gross
Fair Value
Long-term Debt, Fair Value
Statement of Cash Flows [Abstract]
Supplemental cash flow disclosures
Supplemental Cash Flow Information [Abstract]
Operating activities
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net earnings
Noncash items:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization
Depreciation, Depletion and Amortization, Nonproduction
Deferred income taxes
Deferred Income Tax Expense (Benefit)
Share-based compensation
Share-based Compensation
Other, net
Other Noncash Income (Expense)
Net change in other operating items, net of effects from acquisitions and changes in AARP balances:
Increase (Decrease) in Operating Capital [Abstract]
Accounts receivable
Increase (Decrease) in Accounts Receivable
Other assets
Increase (Decrease) in Other Operating Assets
Medical costs payable
Increase (Decrease) in Health Care Insurance Liabilities
Accounts payable and other liabilities
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Other policy liabilities
Increase (Decrease) in Other Policyholder Funds
Unearned revenues
Increase (Decrease) in Deferred Revenue
Cash flows from operating activities
Net Cash Provided by (Used in) Operating Activities
Investing activities
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchases of investments
Payments to Acquire Investments
Sales of investments
Proceeds from Sale of Available-for-sale Securities
Maturities of investments
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities
Cash paid for acquisitions, net of cash assumed
Payments to Acquire Businesses, Net of Cash Acquired
Cash received from dispositions
Proceeds from Divestiture of Businesses
Purchases of property, equipment and capitalized software
Payments to Acquire Property, Plant, and Equipment
Cash flows used for investing activities
Net Cash Provided by (Used in) Investing Activities
Financing activities
Net Cash Provided by (Used in) Financing Activities [Abstract]
Common stock repurchases
Payments for Repurchase of Common Stock
Proceeds from common stock issuances
Proceeds from Issuance of Common Stock
Dividends paid
Payments of Ordinary Dividends, Common Stock
Proceeds from commercial paper, net
Proceeds from (Repayments of) Commercial Paper
Proceeds from issuance of long-term debt
Proceeds from Issuance of Long-term Debt
Repayments of long-term debt
Repayments of Long-term Debt
Customer funds administered
Increase (Decrease) in Other Deposits
Checks outstanding in excess of bank deposits
Increase (Decrease) in Book Overdrafts
Other, net
Proceeds from (Payments for) Other Financing Activities
Cash flows from for financing activities
Net Cash Provided by (Used in) Financing Activities
Effect of exchange rate changes on cash and cash equivalents
Effect of Exchange Rate on Cash and Cash Equivalents
Increase in cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Cash and cash equivalents, beginning of period
Cash and Cash Equivalents, at Carrying Value
Cash and cash equivalents, end of period
Risk free interest rate minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum
Expected volatility minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum
Expected dividend yield
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Forfeiture rate
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Forfeitures
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeitures
Expected Life in years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at beginning of period, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Granted, Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Nonvested at end of period, Shares
Nonvested at beginning of period, 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
Weighted-average grant date fair value of shares granted, per share
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Nonvested at end of period, Weighted-Average Grant Date Fair Value per Share
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, by Asset Type [Axis]
Asset Class [Axis]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Asset Types [Domain]
Fair Value by Asset Class [Domain]
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
Purchases
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases
Sales
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales
Net unrealized losses in accumulated other comprehensive income
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)
Net realized gains in investment and other income
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings
Transfers to held-to-maturity
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net
Balance at end of period
Statement of Financial Position [Abstract]
Assets
Assets [Abstract]
Current assets:
Assets, Current [Abstract]
Cash and cash equivalents
Short-term investments
Short-term Investments
Accounts receivable, net
Accounts Receivable, Net, Current
Other current receivables, net
Other Receivables, Net, Current
Assets under management
AARP Assets Under Management
The Assets Under Management are primarily AARP assets that are managed separately from the general investment portfolio and are used to pay costs associated with the AARP program.
Deferred income taxes
Deferred Tax Assets, Net of Valuation Allowance, Current
Prepaid expenses and other current assets
Prepaid Expense and Other Assets, Current
Total current assets
Assets, Current
Long-term investments
Long-term Investments
Property, equipment and capitalized software, net
Property, Plant and Equipment, Net
Goodwill
Goodwill
Other intangible assets, net
Intangible Assets, Net (Excluding Goodwill)
Other assets
Other Assets, Noncurrent
Total assets
Assets
Liabilities and shareholders' equity
Liabilities and Equity [Abstract]
Current liabilities:
Liabilities, Current [Abstract]
Medical costs payable
Liability for Claims and Claims Adjustment Expense
Accounts payable and accrued liabilities
Accounts Payable and Accrued Liabilities, Current
Other policy liabilities
Other Policyholder Funds
Commercial paper and current maturities of long-term debt
Long-term Debt, Current Maturities
Unearned revenues
Deferred Revenue, Current
Total current liabilities
Liabilities, Current
Long-term debt, less current maturities
Long-term Debt, Excluding Current Maturities
Future policy benefits
Liability for Future Policy Benefits
Deferred income taxes
Deferred Tax Liabilities, Net, Noncurrent
Other liabilities
Other Liabilities, Noncurrent
Total liabilities
Liabilities
Commitments and contingencies (Note 8)
Commitments and Contingencies
Redeemable noncontrolling interest
Redeemable Noncontrolling Interest, Equity, Carrying Amount
Shareholders' equity:
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, $0.001 par value - 10 shares authorized; no shares issued or outstanding
Preferred Stock, Value, Issued
Common stock, $0.01 par value - 3,000 shares authorized; 1,013 and 1,019 issued and outstanding
Common Stock, Value, Issued
Additional paid-in capital
Additional Paid in Capital
Retained earnings
Retained Earnings (Accumulated Deficit)
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss), Net of Tax
Total shareholders' equity
Total liabilities and shareholders’ equity
Liabilities and Equity
Schedule of Revenues from External Customers and Long-Lived Assets [Table]
Schedule of Revenues from External Customers and Long-Lived Assets [Table]
Geographical [Axis]
Geographical [Axis]
Segment, Geographical [Domain]
Segment, Geographical [Domain]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of Reportable Segments
Number of Reportable Segments
Loss Contingencies [Table]
Equity Component [Domain]
Equity Securities [Member]
Publically Traded Shares [Member]
Publically Traded Shares [Member]
Step Acquisition [Axis]
Step Acquisition [Axis]
Step Acquisition [Axis]
Step Acquisition [Domain]
Step Acquisition [Domain]
[Domain] for Step Acquisition [Axis]
Step Three [Member]
Step Three [Member]
Step Three [Member]
Step Three [Member]
Step Four [Member]
Step Four [Member]
Business Acquisition [Axis]
Business Acquisition [Axis]
Business Acquisition, Acquiree [Domain]
Business Acquisition, Acquiree [Domain]
Amil Participacoes S.A. [Member]
Amil Participacoes S.A. [Member]
Amil Participacoes S.A. [Member]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Subsequent Event [Member]
Subsequent Event [Member]
Litigation Case [Axis]
Litigation Case [Axis]
Litigation Case Type [Domain]
Litigation Case Type [Domain]
Endoscopy Center of Southern Nevada Litigation [Member]
Endoscopy Center of Southern Nevada Litigation [Member]
Endoscopy Center of Southern Nevada Litigation [Member]
Litigation Damages [Axis]
Litigation Damages [Axis]
Litigation Damages [Axis]
Litigation Damages [Domain]
Litigation Damages [Domain]
[Domain] for Litigation Damages [Axis]
Compensatory Damages [Member]
Compensatory Damages [Member]
Compensatory Damages [Member]
Punitive Damages [Member]
Punitive Damages [Member]
Punitive Damages [Member]
Commitments and Contingencies Disclosure [Axis]
Commitments and Contingencies Disclosure [Axis]
Loss Contingency, Nature [Domain]
California Claims Processing Matter [Member]
California Claims Processing Matter [Member]
Business Acquisition, Percentage of Voting Interests Acquired
Business Acquisition, Percentage of Voting Interests Acquired
Payments to Acquire Interest in Subsidiaries and Affiliates
Payments to Acquire Interest in Subsidiaries and Affiliates
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners
Minority Interest Ownership Percentage By Noncontrolling Owners, To Be Acquired
The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity, to be acquired.
Estimated Largest Aggregate Penalty Issued By Cdi
Estimated Largest Aggregate Penalty Issued By Cdi
Estimated Largest Aggregate Penalty Issued By Cdi
CDI aggregate penalty
CDI aggregate penalty
CDI aggregate penalty
Loss Contingency, Damages Awarded, Value
Loss Contingency, Damages Awarded, Value
Individual Lawsuits [Line Items]
Individual Lawsuits
Individual Lawsuits
Class Action Lawsuits
Class Action Lawsuits
Class Action Lawsuits
Fair Value [Text Block]
Fair Value Disclosures [Text Block]
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, Measurements, Recurring [Member]
Available-for-sale Securities
Available-for-sale Securities
Significant fair value adjustments for assets and liabilities measured on a nonrecurring basis
Fair Value Adjustments For Assets And Liabilities Measured At Fair Value On Non Recurring Basis
Fair Value Adjustments For Assets And Liabilities Measured At Fair Value On Non recurring basis
Transfers from level 1 to level 2-Assets
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount
Transfers from level 1 to level 2-Liabilities
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount
Transfer from level 2 to level 1-Assets
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount
Transfer from level 2 to level 1-Liabilities
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount
Transfers Into Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3
Transfers out of Level 3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3
Income Statement [Abstract]
Revenues:
Revenues [Abstract]
Premiums
Services
Products
Operating costs:
Costs and Expenses [Abstract]
Medical costs
Policyholder Benefits and Claims Incurred, Health Care
Operating costs
Selling, General and Administrative Expense
Cost of products sold
Cost of Goods Sold
Total operating costs
Costs and Expenses
Earnings from operations
Interest expense
Earnings before income taxes
Provision for income taxes
Income Tax Expense (Benefit)
Less earnings attributable to noncontrolling interest
Net Income (Loss) Attributable to Noncontrolling Interest
Net earnings attributable to UnitedHealth Group common shareholders
Basic net earnings per common share attributable to UnitedHealth Group common shareholders
Earnings Per Share, Basic
Diluted net earnings per common share attributable to UnitedHealth Group common shareholders
Earnings Per Share, Diluted
Basic weighted-average number of common shares outstanding
Weighted Average Number of Shares Outstanding, Basic
Dilutive effect of common stock equivalents
Weighted Average Number Diluted Shares Outstanding Adjustment
Diluted weighted-average number of common shares outstanding
Weighted Average Number of Shares Outstanding, Diluted
Anti-dilutive shares excluded from the calculation of dilutive effect of common stock equivalents
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Common Stock, Dividends, Per Share, Declared
Common Stock, Dividends, Per Share, Declared
Favorable medical cost development
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims, Prior Years
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]
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]
Total OTTI
Marketable Securities, Realized Loss, Other than Temporary Impairments, Amount
Portion of loss recognized in other comprehensive income
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Including Portion Attributable to Noncontrolling Interest
Net OTTI recognized in earnings
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net
Gross realized losses from sales
Cost-method Investments, Realized Losses
Gross realized gains from sales
Cost-method Investments, Realized Gains
Net realized gains (included in Investment and Other Income on the Condensed Consolidated Statements of Operations)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax
Amount before tax of reclassification adjustments of other comprehensive income (loss).
Income tax effect (included in Provision for Income Taxes on the Condensed Consolidated Statements of Operations)
Realized gains, net of taxes
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Amount after tax of reclassification adjustments of other comprehensive income (loss).
Segment Financial Information [Text Block]
Segment Reporting Disclosure [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
Total debt securities - available-for-sale, Amortized Cost
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis
Due in one year or less, Fair Value
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value
Due after one year through five years, Fair Value
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value
Due after five years through ten years, Fair Value
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value
Due after ten years, Fair Value
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value
Mortgage-backed securities, Fair Value
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value
Total debt securities - available-for-sale, Fair Value
Available-for-sale Securities, Debt Securities
Commercial Paper and Long-Term Debt [Table Text Block]
Schedule of Long-term Debt Instruments [Table Text Block]
US Treasury and Government [Member]
Less Than 12 Months, Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value
Less Than 12 Months, Gross Unrealized Losses
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses
12 Months or Greater, Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value
12 Months or Greater, Gross Unrealized Losses
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses
Total, Fair Value
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Available-for-sale securities, Gross Unrealized Losses
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses
Medicare Part D Pharmacy Benefits Contract [Axis]
Medicare Part D Pharmacy Benefits Contract [Axis]
Medicare Part D Pharmacy Benefits Contract [Axis]
Medicare Part D Pharmacy Benefits Contract [Domain]
Medicare Part D Pharmacy Benefits Contract [Domain]
Medicare Part D Pharmacy Benefits Contract [Domain]
CMS Subsidies [Member]
CMS Subsidies [Member]
CMS Subsidies [Member]
Drug Discount [Member]
Drug Discount [Member]
Drug Discount [Member]
Risk-Share [Member]
Risk-Share [Member]
Risk-Share [Member]
Other current receivables
Other policy liabilities
Summary of Investments, by Type [Domain]
Short-Term and Long-Term Investments [Table Text Block]
Unrealized Gain (Loss) on Investments [Table Text Block]
Investments by Contractual Maturity [Table Text Block]
Investments Classified by Contractual Maturity Date [Table Text Block]
Fair Value of Available-for-Sale Investments with Gross Unrealized Losses by Investment Type and Length of Time that Individual Securities have been in a Continuous Unrealized Loss Position [Table Text Block]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]
Net Realized Gains, Included in Investment and Other Income [Table Text Block]
Realized Gain (Loss) on Investments [Table Text Block]
Commercial Paper and Long-Term Debt [Text Block]
Debt Disclosure [Text Block]
Schedule of Held-to-maturity Securities [Table]
Schedule of Held-to-maturity Securities [Table]
Schedule of Held-to-maturity Securities [Line Items]
Schedule of Held-to-maturity Securities [Line Items]
Due in one year or less, Amortized Cost
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount
Due after one year through five years, Amortized Cost
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount
Due after five years through ten years, Amortized Cost
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount
Due after ten years, Amortized Cost
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount
Total debt securities - held-to-maturity, Amortized Cost
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount
Due in one year or less, Fair Value
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value
Due after one year through five years, Fair Value
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value
Due after five years through ten years, Fair Value
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value
Due after ten years, Fair Value
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value
Total debt securities - held-to-maturity, Fair Value
Held-to-maturity Securities, Debt Maturities, Fair Value
Other Share-Based Compensation Data [Abstract]
Other Share-Based Compensation Data [Abstract]
Stock Options and SARs [Member]
Stock Options and SARs [Member] [Member]
Stock Options and SARs [Member]
Restricted Stock Units (RSUs) [Member]
Other Share-Based Compensation Data [Line Items]
Weighted-average grant date fair value of shares granted, per share
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Total intrinsic value of stock options and SARs exercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value
Weighted-average grant date fair value (per share)
Total fair value of restricted shares vested
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value
Share-based compensation expense, before tax
Share-based compensation expense, net of tax effects
Allocated Share-based Compensation Expense, Net of Tax
Income tax benefit realized from share-based award exercises
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options
Unrecognized compensation expense related to share awards
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized
Weighted-average years to recognize compensation expense
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition
Segment Financial Information [Table Text Block]
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Document and Entity Information [Abstract]
Document and Entity Information [Abstract]
Document Information [Table]
Entity Listings [Table]
Document Information, Document [Axis]
Document Information, Document [Axis]
Document [Domain]
Document [Domain]
Document Information [Line Items]
Document Information [Line Items]
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
Entitiy Registrant Name
Entity Registrant Name
Entitiy 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