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Fair Value Measurements (Details Textual) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 professional | Mar. 31, 2014
Fair Value Measurements (Textual) [Abstract] |  |  |
AFG's internal investment professionals | 20 afg_NumberOfInternalInvestmentProfessionals |  |
Level 3 assets as a percentage of total assets measured at fair value | 3.50%afg_LevelThreeAssetAsPercentageOfAssetMeasuredAtFairValue |  |
Percentage of level 3 assets that were priced using non-binding broker quotes | 75.00%afg_PercentageOfLevelThreeAssetsThatWerePricedUsingNonBindingBrokerQuotes |  |
Level 3 assets that were priced using non-binding broker quotes | $ 990 afg_LevelThreeAssetsThatWerePricedUsingNonBindingBrokerQuotes |  |
Percentage of internally developed Level 3 asset fair values to Shareholders' equity | 6.00%afg_PercentageOfInternallyDevelopedLevelThreeAssetsToShareholdersEquity |  |
Total realized/unrealized gains (losses) included in net income on liabilities still outstanding |  |  | 4 afg_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarningsOnLiabilitiesStillOutstanding
Maximum [Member] |  |  |
Fair Value Measurements (Textual) [Abstract] |  |  |
Percentage of internally developed Level 3 asset fair values to total assets (are less than) | 1.00%afg_PercentageOfInternallyDevelopedLevelThreeAssetsToTotalAssets / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Fixed-indexed annuties (embedded derivative), majority of future years [Member] | Minimum [Member] |  |  |
Fair Value Measurements (Textual) [Abstract] |  |  |
Unobservable input surrenders used in Level 3 fair value determination | 5.00%afg_FairValueInputsSurrenders / us-gaap_DerivativeInstrumentRiskAxis = afg_FixedIndexedAnnuitiesEmbeddedDerivativeMajorityofFutureYearsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Fixed-indexed annuties (embedded derivative), majority of future years [Member] | Maximum [Member] |  |  |
Fair Value Measurements (Textual) [Abstract] |  |  |
Unobservable input surrenders used in Level 3 fair value determination | 11.00%afg_FairValueInputsSurrenders / us-gaap_DerivativeInstrumentRiskAxis = afg_FixedIndexedAnnuitiesEmbeddedDerivativeMajorityofFutureYearsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Fixed-indexed annuities (embedded derivative) [Member] |  |  |
Fair Value Measurements (Textual) [Abstract] |  |  |
Fair value of derivatives in annuity benefits accumulated measured using a discounted cash flow approach | 1,240 us-gaap_DerivativeLiabilities / us-gaap_DerivativeInstrumentRiskAxis = afg_FixedIndexedAnnuitiesEmbeddedDerivativeMember |  |
Fixed-indexed annuities (embedded derivative) [Member] | Minimum [Member] |  |  |
Fair Value Measurements (Textual) [Abstract] |  |  |
Unobservable input surrenders used in Level 3 fair value determination | 4.00%afg_FairValueInputsSurrenders / us-gaap_DerivativeInstrumentRiskAxis = afg_FixedIndexedAnnuitiesEmbeddedDerivativeMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Fixed-indexed annuities (embedded derivative) [Member] | Maximum [Member] |  |  |
Fair Value Measurements (Textual) [Abstract] |  |  |
Unobservable input surrenders used in Level 3 fair value determination | 16.00%afg_FairValueInputsSurrenders / us-gaap_DerivativeInstrumentRiskAxis = afg_FixedIndexedAnnuitiesEmbeddedDerivativeMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Common stocks [Member] |  |  |
Fair Value Measurements (Textual) [Abstract] |  |  |
Number of stocks transferred from Level 2 to Level 1 | 1 afg_NumberofStocksTransferredfromLevel2toLevel1DuringthePeriod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
Fair value of assets transferred from Level 2 to Level 1 | 53 us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
Perpetual preferred stocks [Member] |  |  |
Fair Value Measurements (Textual) [Abstract] |  |  |
Number of stocks transferred from Level 2 to Level 1 | 2 afg_NumberofStocksTransferredfromLevel2toLevel1DuringthePeriod / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember |  |
Fair value of assets transferred from Level 2 to Level 1 | 5 us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember |  |
Number of stocks transferred from Level 1 to Level 2 |  |  | 8 afg_NumberofStocksTransferredfromLevel1toLevel2DuringthePeriod / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember
Fair value of assets transferred from Level 1 to Level 2 |  |  | 55 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember
Run-off long-term care insurance business [Member] |  |  |
Fair Value Measurements (Textual) [Abstract] |  |  |
Estimated sale proceeds of the run-off long-term care insurance business | $ 14 afg_DisposalGroupEstimatedProceedsfromDivestitureofBusinessesNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = afg_DisposalGroupsIncludingDiscontinuedOperationsLongtermCareBusinessMember | [1] |
[1] | Includes fair value of the potential additional consideration and is shown net of estimated expenses.

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- Definition Level Three Asset As Percentage Of Asset Measured At Fair Value. + References No definition available. + Details
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- Definition Number of internal investment professionals. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a 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. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: 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 + Details
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