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UNITEDHEALTH GROUP INC

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 2.2.0.7 true Commercial Paper and Long-Term Debt (Effect of Changes in Fair Value of Fair Value Hedges) (Details) (Fair Value Hedge, Interest Expense, USD $) 40704 - Disclosure - Commercial Paper and Long-Term Debt (Effect of Changes in Fair Value of Fair Value Hedges) (Details) true false In Millions false false 1 USD true false false false Fair Value Hedge us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueHedgingMember us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis explicitMember false false Interest Expense us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_InterestExpenseMember us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis explicitMember false false Interest Rate Swap Contracts us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_InterestRateSwapMember us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 2 USD true false false false Fair Value Hedge us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueHedgingMember us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis explicitMember false false Interest Expense us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_InterestExpenseMember us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis explicitMember false false Interest Rate Swap Contracts us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_InterestRateSwapMember us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 1 0 na true na na No definition available. false true false false false false false false false false false http://www.unitedhealthgroup.com/taxonomy/role/disclosuresummaryofeffectofchangesinfairvalueoffairvaluehedges false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false false 1 USD true false false false Fair Value Hedge us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueHedgingMember us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis explicitMember false false Interest Expense us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_InterestExpenseMember us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis explicitMember false false Interest Rate Swap Contracts us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_InterestRateSwapMember us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 2 USD true false false false Fair Value Hedge us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueHedgingMember us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis explicitMember false false Interest Expense us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_InterestExpenseMember us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis explicitMember false false Interest Rate Swap Contracts us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_InterestRateSwapMember us-gaap_DerivativesFairValueByDerivativeInstrumentRiskAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 2 2 us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeNet us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 true true false false 56000000 56 false false false 2 true true false false 89000000 89 false false false xbrli:monetaryItemType monetary The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b false 3 0 na true na na No definition available. false true false false false false false false false false false http://www.unitedhealthgroup.com/taxonomy/role/disclosuresummaryofeffectofchangesinfairvalueoffairvaluehedges false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false false 3 USD true false false false Fair Value Hedge us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueHedgingMember us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis explicitMember false false Interest Expense us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_InterestExpenseMember us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis explicitMember false false Fixed Rate Debt us-gaap_DebtInstrumentAxis xbrldi http://xbrl.org/2006/xbrldi unh_FixedRateDebtMember us-gaap_DebtInstrumentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 4 USD true false false false Fair Value Hedge us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueHedgingMember us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis explicitMember false false Interest Expense us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_InterestExpenseMember us-gaap_DerivativeInstrumentsGainLossByIncomeStatementLocationAxis explicitMember false false Fixed Rate Debt us-gaap_DebtInstrumentAxis xbrldi http://xbrl.org/2006/xbrldi unh_FixedRateDebtMember us-gaap_DebtInstrumentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 4 2 us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeNet us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 true true false false -56000000 -56 false false false 2 true true false false -89000000 -89 false false false xbrli:monetaryItemType monetary The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b false 2 4 false Millions UnKnown UnKnown false true