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UNITEDHEALTH GROUP INC

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 2.2.0.7 true Commercial Paper and Long-Term Debt (Narrative) (Details) (USD $) 40701 - Disclosure - Commercial Paper and Long-Term Debt (Narrative) (Details) true false false false 1 USD false false Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 2 true false false false unh_DueOctober2020Member us-gaap_LongtermDebtTypeAxis xbrldi http://xbrl.org/2006/xbrldi unh_DueOctober2020Member us-gaap_LongtermDebtTypeAxis explicitMember false false unh_SeniorUnsecuredNotesMember us-gaap_DebtInstrumentAxis xbrldi http://xbrl.org/2006/xbrldi unh_SeniorUnsecuredNotesMember us-gaap_DebtInstrumentAxis explicitMember false 3 true false false false unh_DueOctober2020Member us-gaap_LongtermDebtTypeAxis xbrldi http://xbrl.org/2006/xbrldi unh_DueOctober2020Member us-gaap_LongtermDebtTypeAxis explicitMember false false unh_FixedRate3875PercentMember unh_RangeAxis xbrldi http://xbrl.org/2006/xbrldi unh_FixedRate3875PercentMember unh_RangeAxis explicitMember Unit14 Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 4 true false false false unh_DueOctober2040Member us-gaap_LongtermDebtTypeAxis xbrldi http://xbrl.org/2006/xbrldi unh_DueOctober2040Member us-gaap_LongtermDebtTypeAxis explicitMember false false unh_SeniorUnsecuredNotesMember us-gaap_DebtInstrumentAxis xbrldi http://xbrl.org/2006/xbrldi unh_SeniorUnsecuredNotesMember us-gaap_DebtInstrumentAxis explicitMember false 5 true false false false unh_DueOctober2040Member us-gaap_LongtermDebtTypeAxis xbrldi http://xbrl.org/2006/xbrldi unh_DueOctober2040Member us-gaap_LongtermDebtTypeAxis explicitMember false false unh_FixedRate5700PercentMember unh_RangeAxis xbrldi http://xbrl.org/2006/xbrldi unh_FixedRate5700PercentMember unh_RangeAxis explicitMember Unit14 Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 6 true false false false us-gaap_CommercialPaperMember us-gaap_DebtInstrumentAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_CommercialPaperMember us-gaap_DebtInstrumentAxis explicitMember Unit14 Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 7 USD true false false false unh_RevolvingCreditFacilityMember us-gaap_DebtInstrumentAxis xbrldi http://xbrl.org/2006/xbrldi unh_RevolvingCreditFacilityMember us-gaap_DebtInstrumentAxis explicitMember Unit14 Standard http://www.xbrl.org/2003/instance pure xbrli 0 Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 8 true false false false unh_RevolvingCreditFacilityMember us-gaap_DebtInstrumentAxis xbrldi http://xbrl.org/2006/xbrldi unh_RevolvingCreditFacilityMember us-gaap_DebtInstrumentAxis explicitMember false false unh_MinimumMember unh_RangeAxis xbrldi http://xbrl.org/2006/xbrldi unh_MinimumMember unh_RangeAxis explicitMember Unit14 Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 9 true false false false unh_RevolvingCreditFacilityMember us-gaap_DebtInstrumentAxis xbrldi http://xbrl.org/2006/xbrldi unh_RevolvingCreditFacilityMember us-gaap_DebtInstrumentAxis explicitMember false false unh_MaximumMember unh_RangeAxis xbrldi http://xbrl.org/2006/xbrldi unh_MaximumMember unh_RangeAxis explicitMember Unit14 Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 10 USD true false false false unh_SeniorUnsecuredNotesMember us-gaap_DebtInstrumentAxis xbrldi http://xbrl.org/2006/xbrldi unh_SeniorUnsecuredNotesMember us-gaap_DebtInstrumentAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 5 3 unh_MaturityDateOfCommercialPaper unh false na duration Maturity date of commercial paper false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 <font class="_mt">270 days</font> 270 days true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false xbrli:stringItemType string Maturity date of commercial paper No authoritative reference available. false 6 3 us-gaap_DebtInstrumentInterestRateDuringPeriod us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false true false false 0.004 0.004 true false false 7 false false false false 0 0 true false false 8 false true false false 0.005 0.005 true false false 9 false true false false 0.007 0.007 true false false 10 false false false false 0 0 true false false us-types:percentItemType pure The average effective interest rate during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 false 7 3 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 true true false false 2500000000 2500000000 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false xbrli:monetaryItemType monetary Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false 8 3 unh_MaximumPercentageOfIndebtednessToTotalNetCapitalBankCovenant unh false na instant Maximum percentage of indebtedness to total net capital bank covenant 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 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false 0.5 0.5 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false us-types:percentItemType pure Maximum percentage of indebtedness to total net capital bank covenant No authoritative reference available. false 9 3 unh_NumberOfBanks unh false na instant Number of Banks 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 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false 23 23 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false xbrli:integerItemType integer Number of Banks No authoritative reference available. false 10 3 us-gaap_LineOfCreditFacilityAmountOutstanding us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false true false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false xbrli:monetaryItemType monetary Amount borrowed under the credit facility as of the balance-sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false 11 3 unh_DebtInstrumentFaceAmountCashTenderPurchase unh false credit instant Debt Instrument, Face Amount, Cash Tender Purchase 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 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false true false false 775000000 775000000 true false false xbrli:monetaryItemType monetary Debt Instrument, Face Amount, Cash Tender Purchase No authoritative reference available. false 12 3 us-gaap_DebtInstrumentInterestRateStatedPercentage us-gaap true na instant No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false true false false 0.03875 0.03875 true false false 4 false false false false 0 0 true false false 5 false true false false 0.057 0.057 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false us-types:percentItemType pure Interest rate stated in the contractual debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 false 13 3 us-gaap_DebtInstrumentIssuanceDate us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 <font class="_mt">October <font class="_mt">2010</font></font> October 2010 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false us-types:dateStringItemType normalizedstring Date when the debt instrument was issued, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 false 14 3 us-gaap_SeniorNotes us-gaap true credit instant No definition available. false false false false false false false false false false false terselabel false 1 true true false false 750000000 750000000 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false xbrli:monetaryItemType monetary Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 false 15 3 us-gaap_DebtInstrumentMaturityDate us-gaap true na duration No definition available. 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 2020-10-15 2020-10-15 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 2040-10-15 2040-10-15 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false xbrli:dateItemType date Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 false 10 11 false NoRounding UnKnown UnKnown false true