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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Effective Income Tax Rate Reconciliation, Amount [Abstract]    
Earnings before income taxes (“EBT”) $ 30us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 161us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income taxes at statutory rate 10us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 56us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Effect of tax exempt interest (7)us-gaap_IncomeTaxReconciliationTaxExemptIncome (5)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Effect of change in valuation allowance (1)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 1us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effect of subsidiaries not in AFG's tax return 1afg_IncomeTaxReconciliationSubsidiariesNotInCompanysTaxReturn 1afg_IncomeTaxReconciliationSubsidiariesNotInCompanysTaxReturn
Effect of other income tax reconciliation 2us-gaap_IncomeTaxReconciliationOtherAdjustments 1us-gaap_IncomeTaxReconciliationOtherAdjustments
Provision for income taxes as shown on the Statement of Earnings $ 5us-gaap_IncomeTaxExpenseBenefit $ 54us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
Income taxes at statutory rate as a percentage of EBT 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Effect of tax exempt interest as a percentage of EBT (23.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Effect of change in valuation allowance as a percentage of EBT (3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effect of subsidiaries not in AFG's tax return as a percentage of EBT 3.00%afg_EffectiveIncomeTaxRateReconciliationSubsidiariesNotInCompanysTaxReturn 1.00%afg_EffectiveIncomeTaxRateReconciliationSubsidiariesNotInCompanysTaxReturn
Effect of other income tax reconciliation as a percentage of EBT 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Provision for income taxes as shown on the Statement of Earnings as a percentage of EBT 17.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 34.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations