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Derivatives (Details) (Not Designated as Hedging Instrument [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Derivatives included in AFG' s Balance Sheet at fair value |  |
Derivative asset, at fair value | $ 480 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral | $ 499 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Derivative liability, at fair value | 1,256 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral | 1,173 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
MBS with embedded derivatives [Member] | Fixed maturities [Member] |  |
Derivatives included in AFG' s Balance Sheet at fair value |  |
Derivative asset, at fair value | 164 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_FixedMaturitiesMember / us-gaap_DerivativeInstrumentRiskAxis = afg_MortgageBackedSecuritiesWithEmbeddedDerivativesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 158 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_FixedMaturitiesMember / us-gaap_DerivativeInstrumentRiskAxis = afg_MortgageBackedSecuritiesWithEmbeddedDerivativesMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Public company warrants [Member] | Equity securities [Member] |  |
Derivatives included in AFG' s Balance Sheet at fair value |  |
Derivative asset, at fair value | 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_EquitySecuritiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_WarrantMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 19 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_EquitySecuritiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_WarrantMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Interest rate swaptions [Member] | Other investments [Member] |  |
Derivatives included in AFG' s Balance Sheet at fair value |  |
Derivative asset, at fair value | 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherInvestmentsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwaptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherInvestmentsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwaptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Fixed-indexed annuities (embedded derivative) [Member] | Annuity benefits accumulated [Member] |  |
Derivatives included in AFG' s Balance Sheet at fair value |  |
Derivative liability, at fair value | 1,243 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = afg_AnnuityBenefitsAccumulatedMember / us-gaap_DerivativeInstrumentRiskAxis = afg_FixedIndexedAnnuitiesEmbeddedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 1,160 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = afg_AnnuityBenefitsAccumulatedMember / us-gaap_DerivativeInstrumentRiskAxis = afg_FixedIndexedAnnuitiesEmbeddedDerivativeMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Equity index call options [Member] | Other investments [Member] |  |
Derivatives included in AFG' s Balance Sheet at fair value |  |
Derivative asset, at fair value | 316 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherInvestmentsMember / us-gaap_DerivativeInstrumentRiskAxis = afg_EquityIndexCallOptionsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 322 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherInvestmentsMember / us-gaap_DerivativeInstrumentRiskAxis = afg_EquityIndexCallOptionsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Reinsurance contracts (embedded derivative) [Member] | Other liabilities [Member] |  |
Derivatives included in AFG' s Balance Sheet at fair value |  |
Derivative liability, at fair value | $ 13 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 13 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OtherContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

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- Definition Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226006-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41678-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226006-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41678-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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