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Derivatives (Details 1) (Not Designated as Hedging Instrument [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Derivative, Gain (Loss) on Derivative, Net [Abstract] |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ (32)us-gaap_DerivativeGainLossOnDerivativeNet | $ (26)us-gaap_DerivativeGainLossOnDerivativeNet
MBS with embedded derivatives [Member] | Realized gains on securities [Member] |  |
Derivative, Gain (Loss) on Derivative, Net [Abstract] |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | (2)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = afg_MortgageBackedSecuritiesWithEmbeddedDerivativesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = afg_RealizedGainsLossesOnSecuritiesMember | 3 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = afg_MortgageBackedSecuritiesWithEmbeddedDerivativesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = afg_RealizedGainsLossesOnSecuritiesMember
Public company warrants [Member] | Realized gains on securities [Member] |  |
Derivative, Gain (Loss) on Derivative, Net [Abstract] |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_WarrantMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = afg_RealizedGainsLossesOnSecuritiesMember | (2)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_WarrantMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = afg_RealizedGainsLossesOnSecuritiesMember
Interest rate swaptions [Member] | Realized gains on securities [Member] |  |
Derivative, Gain (Loss) on Derivative, Net [Abstract] |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwaptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = afg_RealizedGainsLossesOnSecuritiesMember | (1)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwaptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = afg_RealizedGainsLossesOnSecuritiesMember
Fixed-indexed annuities (embedded derivative) [Member] | Annuity benefits [Member] |  |
Derivative, Gain (Loss) on Derivative, Net [Abstract] |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | (50)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = afg_FixedIndexedAnnuitiesEmbeddedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = afg_AnnuitybenefitsMember | (54)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = afg_FixedIndexedAnnuitiesEmbeddedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = afg_AnnuitybenefitsMember
Equity index call options [Member] | Annuity benefits [Member] |  |
Derivative, Gain (Loss) on Derivative, Net [Abstract] |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 20 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = afg_EquityIndexCallOptionsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = afg_AnnuitybenefitsMember | 30 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = afg_EquityIndexCallOptionsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = afg_AnnuitybenefitsMember
Reinsurance contracts (embedded derivative) [Member] | Net investment income [Member] |  |
Derivative, Gain (Loss) on Derivative, Net [Abstract] |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember | $ (2)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InvestmentIncomeMember

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
Name: | us-gaap_DerivativeGainLossOnDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_DerivativeGainLossOnDerivativeNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration