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UNITEDHEALTH GROUP INC

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 2.2.0.7 false Share-Based Compensation (Share-Based Compensation Principal Fair Value Assumptions) (Details) 41003 - Disclosure - Share-Based Compensation (Share-Based Compensation Principal Fair Value Assumptions) (Details) true false false false 1 USD false false Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit14 Standard http://www.xbrl.org/2003/instance pure xbrli 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 Unit13 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 USD false false Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit14 Standard http://www.xbrl.org/2003/instance pure xbrli 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 Unit13 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 3 USD false false Unit13 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit14 Standard http://www.xbrl.org/2003/instance pure xbrli 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 4 USD false false Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit14 Standard http://www.xbrl.org/2003/instance pure xbrli 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 Unit13 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 0 us-gaap_ShareBasedCompensationAllocationAndClassificationInFinancialStatementsAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 1 unh_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateLowerLimit unh false na duration Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Lower... false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 0.014 0.014 false false false 4 false true false false 0.017 0.017 false false false us-types:percentItemType pure Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Lower Limit No authoritative reference available. false 4 1 unh_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateUpperLimit unh false na duration Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Upper... false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 0.021 0.021 false false false 4 false true false false 0.024 0.024 false false false us-types:percentItemType pure Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Upper Limit No authoritative reference available. false 5 1 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false true false false 0.014 0.014 false false false 2 false true false false 0.024 0.024 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false us-types:percentItemType pure The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(d) false 6 1 unh_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateLowerLimit unh false na duration Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Lower... false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 0.454 0.454 false false false 4 false true false false 0.413 0.413 false false false us-types:percentItemType pure Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Lower Limit No authoritative reference available. false 7 1 unh_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateUpperLimit unh false na duration Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Upper... false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 0.462 0.462 false false false 4 false true false false 0.465 0.465 false false false us-types:percentItemType pure Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Upper Limit No authoritative reference available. false 8 1 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false true false false 0.454 0.454 false false false 2 false true false false 0.465 0.465 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false us-types:percentItemType pure The estimated measure of the percentage amount by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(b) false 9 1 unh_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendYieldLowerLimit unh false na duration Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Yield Lower Limit false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 0.001 0.001 false false false 4 false false false false 0 0 false false false us-types:percentItemType pure Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Yield Lower Limit No authoritative reference available. false 10 1 unh_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendYieldUpperLimit unh false na duration Share-Based Compensation Arrangement By Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Yield, Upper... false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 0.017 0.017 false false false 4 false false false false 0 0 false false false us-types:percentItemType pure Share-Based Compensation Arrangement By Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Yield, Upper Limit No authoritative reference available. false 11 1 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false true false false 0.015 0.015 false false false 2 false true false false 0.001 0.001 false false false 3 false false false false 0 0 false false false 4 false true false false 0.001 0.001 false false false us-types:percentItemType pure The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(c) false 12 1 unh_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitures unh false na duration Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeitures false false false false false false false false false false false terselabel false 1 false true false false 0.05 0.05 false false false 2 false true false false 0.05 0.05 false false false 3 false true false false 0.05 0.05 false false false 4 false true false false 0.05 0.05 false false false us-types:percentItemType pure Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeitures No authoritative reference available. false 13 1 unh_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermLowerLimit unh false na duration Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term, Lower Limit false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 4.6 4.6 false false false 4 false true false false 4.4 4.4 false false false xbrli:decimalItemType decimal Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term, Lower Limit No authoritative reference available. false 14 1 unh_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermUpperLimit unh false na duration Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term, Upper Limit false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 5.1 5.1 false false false 4 false true false false 5.1 5.1 false false false xbrli:decimalItemType decimal Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term, Upper Limit No authoritative reference available. false 15 1 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false true false false 4.6 4.6 false false false 2 false true false false 4.4 4.4 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:decimalItemType decimal The period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(a) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 false 4 14 false UnKnown UnKnown UnKnown true true