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Investments (Details 6) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | $ 23 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments | $ 20 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
Realized — impairments | (4)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities | (1)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
Fixed maturities [Member] |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | 3 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember | 13 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember
Realized — impairments | (5)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember | (1)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember
Change in unrealized | 218 afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember | 316 afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember
Equity securities [Member] |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | 21 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 6 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Realized — impairments | (2)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Change in unrealized | 6 afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 13 afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Mortgage Loans and Other Investments [Member] |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | 0 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_MortgageLoansAndOtherInvestmentsMember | 1 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_MortgageLoansAndOtherInvestmentsMember
Realized — impairments | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_MortgageLoansAndOtherInvestmentsMember | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_MortgageLoansAndOtherInvestmentsMember
Change in unrealized | 0 afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_MortgageLoansAndOtherInvestmentsMember | 0 afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_MortgageLoansAndOtherInvestmentsMember
Other, Including DPAC and Reserves on Annuity and Long-term Care [Member] |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | (1)us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_OtherIncludingDPACandReservesonAnnuityandLongtermCareMember | 0 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_OtherIncludingDPACandReservesonAnnuityandLongtermCareMember
Realized — impairments | 3 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_OtherIncludingDPACandReservesonAnnuityandLongtermCareMember | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_OtherIncludingDPACandReservesonAnnuityandLongtermCareMember
Change in unrealized | (137)afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_OtherIncludingDPACandReservesonAnnuityandLongtermCareMember | (136)afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_OtherIncludingDPACandReservesonAnnuityandLongtermCareMember
Total Pretax [Member] |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | 23 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_PretaxMember | 20 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_PretaxMember
Realized — impairments | (4)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_PretaxMember | (1)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_PretaxMember
Change in unrealized | 87 afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_PretaxMember | 193 afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_PretaxMember
Tax Effects [Member] |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | (8)us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_TaxEffectsMember | (7)us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_TaxEffectsMember
Realized — impairments | 1 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_TaxEffectsMember | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_TaxEffectsMember
Change in unrealized | (30)afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_TaxEffectsMember | (68)afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_TaxEffectsMember
Noncontrolling Interests [Member] |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | 0 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_NoncontrollingInterestMember | 0 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_NoncontrollingInterestMember
Realized — impairments | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_NoncontrollingInterestMember | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_NoncontrollingInterestMember
Change in unrealized | (1)afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_NoncontrollingInterestMember | (3)afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_NoncontrollingInterestMember
Marketable Securities [Member] |  |
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments |  |
Realized before impairments | 15 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_MarketableSecuritiesMember | 13 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_MarketableSecuritiesMember
Realized — impairments | (3)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_MarketableSecuritiesMember | (1)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_MarketableSecuritiesMember
Change in unrealized | $ 56 afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_MarketableSecuritiesMember | $ 122 afg_ChangeInUnrealizedAppreciationDepreciation / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = afg_MarketableSecuritiesMember

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- Definition The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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