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Segments of Operations (Details 1) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |
Earnings before realized gains (losses) and income taxes | $ 173 afg_OperatingIncomeLossBeforeRealizedGainsLossesAndIncomeTaxes |  | $ 142 afg_OperatingIncomeLossBeforeRealizedGainsLossesAndIncomeTaxes |
Realized gains on securities | 19 us-gaap_MarketableSecuritiesRealizedGainLoss |  | 19 us-gaap_MarketableSecuritiesRealizedGainLoss |
Realized loss on subsidiaries | (162)afg_RealizedGainsLossesOnSubsidiaries |  | 0 afg_RealizedGainsLossesOnSubsidiaries |
Earnings before income taxes | 30 us-gaap_OperatingIncomeLoss |  | 161 us-gaap_OperatingIncomeLoss |
Property and Casualty Insurance [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Property and casualty insurance underwriting | 60 afg_PropertyAndCasualtyInsuranceUnderwritingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember |  | 58 afg_PropertyAndCasualtyInsuranceUnderwritingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember |
Investment and other income, net | 73 afg_InvestmentAndOtherIncomeNet / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember |  | 54 afg_InvestmentAndOtherIncomeNet / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember |
Earnings before realized gains (losses) and income taxes | 133 afg_OperatingIncomeLossBeforeRealizedGainsLossesAndIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember |  | 112 afg_OperatingIncomeLossBeforeRealizedGainsLossesAndIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = afg_PropertyAndCasualtyInsuranceMember |
Annuity [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earnings before realized gains (losses) and income taxes | 75 afg_OperatingIncomeLossBeforeRealizedGainsLossesAndIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityMember |  | 73 afg_OperatingIncomeLossBeforeRealizedGainsLossesAndIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = afg_AnnuityMember |
Run-off Long-term Care and Life [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earnings before realized gains (losses) and income taxes | 4 afg_OperatingIncomeLossBeforeRealizedGainsLossesAndIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = afg_RunOffLongTermCareAndLifeMember |  | (2)afg_OperatingIncomeLossBeforeRealizedGainsLossesAndIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = afg_RunOffLongTermCareAndLifeMember |
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earnings before realized gains (losses) and income taxes | (39)afg_OperatingIncomeLossBeforeRealizedGainsLossesAndIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1] | (41)afg_OperatingIncomeLossBeforeRealizedGainsLossesAndIncomeTaxes / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1]
Specialty Property and transportation [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Property and casualty insurance underwriting | 7 afg_PropertyAndCasualtyInsuranceUnderwritingIncomeLoss / us-gaap_SubsegmentsAxis = afg_SpecialtyPropertyAndTransportationInsuranceMember |  | 6 afg_PropertyAndCasualtyInsuranceUnderwritingIncomeLoss / us-gaap_SubsegmentsAxis = afg_SpecialtyPropertyAndTransportationInsuranceMember |
Specialty casualty [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Property and casualty insurance underwriting | 28 afg_PropertyAndCasualtyInsuranceUnderwritingIncomeLoss / us-gaap_SubsegmentsAxis = afg_SpecialtyCasualtyInsuranceMember |  | 38 afg_PropertyAndCasualtyInsuranceUnderwritingIncomeLoss / us-gaap_SubsegmentsAxis = afg_SpecialtyCasualtyInsuranceMember |
Specialty financial [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Property and casualty insurance underwriting | 22 afg_PropertyAndCasualtyInsuranceUnderwritingIncomeLoss / us-gaap_SubsegmentsAxis = afg_SpecialtyFinancialInsuranceMember |  | 10 afg_PropertyAndCasualtyInsuranceUnderwritingIncomeLoss / us-gaap_SubsegmentsAxis = afg_SpecialtyFinancialInsuranceMember |
Specialty Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Property and casualty insurance underwriting | 3 afg_PropertyAndCasualtyInsuranceUnderwritingIncomeLoss / us-gaap_SubsegmentsAxis = afg_SpecialtyOtherInsuranceMember |  | 5 afg_PropertyAndCasualtyInsuranceUnderwritingIncomeLoss / us-gaap_SubsegmentsAxis = afg_SpecialtyOtherInsuranceMember |
Other Lines [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Property and casualty insurance underwriting | $ 0 afg_PropertyAndCasualtyInsuranceUnderwritingIncomeLoss / us-gaap_SubsegmentsAxis = afg_OtherLinesMember |  | $ (1)afg_PropertyAndCasualtyInsuranceUnderwritingIncomeLoss / us-gaap_SubsegmentsAxis = afg_OtherLinesMember |
[1] | Includes holding company expenses. Also includes earnings of managed investment entities attributable to noncontrolling interest of less than $1 million for the first three months of 2014. Following the adoption of new guidance in the first quarter of 2015, there are no longer earnings of managed investment entities that are attributable to noncontrolling interests. See Note A — “Accounting Policies — Managed Investment Entities.”

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- Definition Underwriting income (loss) for the property and casualty insurance segment, which is calculated as premiums earned less losses and loss adjustment expenses less commissions and other underwriting expenses. + References No definition available. + Details
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