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UNITEDHEALTH GROUP INC

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No authoritative reference available. false 4 2 unh_TotalNumberOfSecurityPositions unh false na instant Total number of security positions false false false false false false false false false false false false 1 false true false false 13000 13000 false false false xbrli:integerItemType integer Total number of security positions No authoritative reference available. false 6 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/disclosureinvestmentsadditionalinformation false 1 false false false false 0 0 false false false false 3 USD true false false false unh_SecuritiesCollateralizedBySubPrimeHomeEquityLinesOfCreditMember unh_FairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisAxis xbrldi http://xbrl.org/2006/xbrldi unh_SecuritiesCollateralizedBySubPrimeHomeEquityLinesOfCreditMember unh_FairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 4 USD true false false false unh_SecuritiesCollateralizedBySubPrimeHomeEquityLinesOfCreditMember unh_FairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisAxis xbrldi http://xbrl.org/2006/xbrldi unh_SecuritiesCollateralizedBySubPrimeHomeEquityLinesOfCreditMember unh_FairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 7 2 us-gaap_MarketableSecurities us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 6000000 6 false false false xbrli:monetaryItemType monetary Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. 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No authoritative reference available. false 12 2 us-gaap_MarketableSecurities us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 16000000 16 false false false xbrli:monetaryItemType monetary Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 false 16 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/disclosureinvestmentsadditionalinformation false 1 false false false false 0 0 false false false false 7 USD true false false false unh_CommercialMortgageLoansInDefaultMember unh_FairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisAxis xbrldi http://xbrl.org/2006/xbrldi unh_CommercialMortgageLoansInDefaultMember unh_FairValueAssetsAndLiabilitiesMeasuredOnARecurringBasisAxis explicitMember false false us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis explicitMember Unit14 Standard http://www.xbrl.org/2003/instance pure xbrli 0 Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 17 2 us-gaap_MarketableSecurities us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 true true false false 8000000 8 false false false xbrli:monetaryItemType monetary Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 false 20 2 unh_PercentageOfLoansInDefault unh false na instant Percentage of Loans in Default false false false false false false false false false false false terselabel false 1 false true false false 0.01 0.01 false false false us-types:percentItemType pure Percentage of Loans in Default No authoritative reference available. false 1 10 false Millions UnKnown UnKnown false true