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USD ($)
USD ($) / shares
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USD ($)
USD ($) / shares
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USD ($)
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-Paragraph 20
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falsefalse15false0us-gaap_IncreaseDecreaseInOtherPolicyholderFundsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse1000000010falsefalsefalsefalsefalse2truefalsefalse104000000104falsefalsefalsefalsefalse3truefalsefalse-170000000-170falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe change, in other policyholder funds recorded on the balance sheet, is needed to adjust net income to arrive at net cash flows provided by (used in) operations.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse16false0us-gaap_IncreaseDecreaseInDeferredRevenueus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse352000000352falsefalsefalsefalsefalse2truefalsefalse-6000000-6falsefalsefalsefalsefalse3truefalsefalse3300000033falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the reporting period, excluding the portion taken into income, in the liability reflecting services yet to be performed by the reporting entity for which cash or other forms of consideration was received or recorded as a receivable.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse17false0us-gaap_NetCashProvidedByUsedInOperatingActivitiesus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse62730000006273falsefalsefalsefalsefalse2truefalsefalse56250000005625falsefalsefalsefalsefalse3truefalsefalse42380000004238falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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truefalse18true0us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse19false0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquiredus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-2323000000-2323falsefalsefalsefalsefalse2truefalsefalse-486000000-486falsefalsefalsefalsefalse3truefalsefalse-4012000000-4012falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse20false0us-gaap_ProceedsFromDivestitureOfBusinessesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1900000019falsefalsefalsefalsefalse2truefalsefalse00falsefalsefalsefalsefalse3truefalsefalse199000000199falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalse21false0us-gaap_PaymentsToAcquireProductiveAssetsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-878000000-878falsefalsefalsefalsefalse2truefalsefalse-739000000-739falsefalsefalsefalsefalse3truefalsefalse-791000000-791falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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falsefalse22false0us-gaap_ProceedsFromSaleOfProductiveAssetsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse00falsefalsefalsefalsefalse2truefalsefalse00falsefalsefalsefalsefalse3truefalsefalse185000000185falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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falsefalse23false0us-gaap_PaymentsToAcquireInvestmentsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-7855000000-7855falsefalsefalsefalsefalse2truefalsefalse-6466000000-6466falsefalsefalsefalsefalse3truefalsefalse-9251000000-9251falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow associated with the purchase of all investments (debt, security, other) during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 95
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falsefalse24false0us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse25930000002593falsefalsefalsefalsefalse2truefalsefalse40400000004040falsefalsefalsefalsefalse3truefalsefalse55680000005568falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 18
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-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 15
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-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 16
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-Publisher OTS
-Name Federal Regulation (FR)
-Number Title 12
-Chapter V
-Section 563c.102
-Subsection III
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
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falsefalse26false0us-gaap_NetCashProvidedByUsedInInvestingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-5339000000-5339falsefalsefalsefalsefalse2truefalsefalse-976000000-976falsefalsefalsefalsefalse3truefalsefalse-5072000000-5072falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) from investing activity.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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truefalse27true0us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse28false0unh_ProceedsFromRepaymentsofCommercialPaperunhfalsedebitdurationThe net cash inflow (outflow) associated with commercial paper.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse930000000930falsefalsefalsefalsefalse2truefalsefalse-99000000-99falsefalsefalsefalsefalse3truefalsefalse-1346000000-1346falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) associated with commercial paper.No authoritative reference available.falsefalse29false0us-gaap_ProceedsFromIssuanceOfLongTermDebtus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse747000000747falsefalsefalsefalsefalse2truefalsefalse00falsefalsefalsefalsefalse3truefalsefalse29810000002981falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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falsefalse32false0us-gaap_PaymentsForRepurchaseOfCommonStockus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-2517000000-2517falsefalsefalsefalsefalse2truefalsefalse-1801000000-1801falsefalsefalsefalsefalse3truefalsefalse-2684000000-2684falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow to reacquire common stock during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 18
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falsefalse33false0us-gaap_ProceedsFromIssuanceOfCommonStockus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse272000000272falsefalsefalsefalsefalse2truefalsefalse282000000282falsefalsefalsefalsefalse3truefalsefalse299000000299falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow from the additional capital contribution to the entity.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Emerging Issues Task Force (EITF)
-Number 00-15
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-Publisher AICPA
-Name Audit and Accounting Guide (AAG)
-Number AAG-DEP
-Chapter 13
-IssueDate 2006-05-01
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-Paragraph 18
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falsefalse37false0us-gaap_IncreaseDecreaseInOutstandingChecksFinancingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse-5000000-5falsefalsefalsefalsefalse2truefalsefalse2200000022falsefalsefalsefalsefalse3truefalsefalse12240000001224falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe change in cash during the period due to the net increase or decrease in outstanding checks, the liability that represents checks that have been issued but that have not cleared. The entity may classify these cash flows as financing or operating activities.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18, 19, 20
falsefalse38false0us-gaap_ProceedsFromPaymentsForOtherFinancingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse-7000000-7falsefalsefalsefalsefalse2truefalsefalse-48000000-48falsefalsefalsefalsefalse3truefalsefalse-143000000-143falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18, 19, 20
falsefalse39false0us-gaap_NetCashProvidedByUsedInFinancingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-1611000000-1611falsefalsefalsefalsefalse2truefalsefalse-2275000000-2275falsefalsefalsefalsefalse3truefalsefalse-605000000-605falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) from financing activity for the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 26
truefalse40false0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-677000000-677falsefalsefalsefalsefalse2truefalsefalse23740000002374falsefalsefalsefalsefalse3truefalsefalse-1439000000-1439falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change between the beginning and ending balance of cash and cash equivalents.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 26
truefalse41false0us-gaap_CashAndCashEquivalentsAtCarryingValueus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1truefalsefalse98000000009800falsefalsefalsefalsefalse2truefalsefalse74260000007426falsefalsefalsefalsefalse3truefalsefalse88650000008865falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryIncludes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 7, 26
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 8, 9
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 7
-Footnote 1
Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 1
-Article 5
falsefalse42false0us-gaap_CashAndCashEquivalentsAtCarryingValueus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1truefalsefalse91230000009123falsefalsefalsefalsefalse2truefalsefalse98000000009800falsefalsefalsefalsefalse3truefalsefalse74260000007426falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryIncludes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 7, 26
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 8, 9
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 7
-Footnote 1
Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 1
-Article 5
falsefalse43true0us-gaap_SupplementalCashFlowInformationAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse44false0us-gaap_InterestPaidus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse509000000509falsefalsefalsefalsefalse2truefalsefalse527000000527falsefalsefalsefalsefalse3truefalsefalse621000000621falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of cash paid during the current period for interest owed on money borrowed; includes amount of interest capitalizedReference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 29
falsefalse45false0us-gaap_IncomeTaxesPaidNetus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse27250000002725falsetruefalsefalsefalse2truefalsefalse20480000002048falsetruefalsefalsefalse3truefalsefalse18820000001882falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 29
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 27
-Subparagraph f
falsefalse343Consolidated Statements of Cash Flows (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue
