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Shareholders' Equity (Details 4) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Components of accumulated other comprehensive income      
Unrealized holding gains (losses) on securities arising during the period, pretax $ 334us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax $ (188)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax  
Unrealized holding gains (losses) on securities arising during the period, tax (118)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 66us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax  
Unrealized holding gains (losses) on securities arising during the period, net of tax 216us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (122)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 408us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Unrealized holding gains (losses) on securities arising during the period, attributable to noncontrolling interests (4)afg_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTaxPortionAttributableToNoncontrollingInterest 4afg_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTaxPortionAttributableToNoncontrollingInterest  
Unrealized holding gains (losses) on securities arising during the period, attributable to shareholders 212afg_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTaxPortionAttributableToParent (118)afg_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTaxPortionAttributableToParent  
Reclassification adjustment for realized gains (losses) included in net earnings, pretax (52)afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeBeforeTax [1] (222)afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeBeforeTax [1]  
Reclassification adjustment for realized gains (losses) included in net earnings, tax 19afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeTax [1] 78afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeTax [1]  
Reclassification adjustment for realized gains (losses) included in net earnings, net of tax (33)afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTax (144)afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTax (138)afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTax
Reclassification adjustment for realized gains (losses) included in net earnings, attributable to noncontrolling interests 1afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTaxPortionAttributableToNoncontrollingInterest [1] 2afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTaxPortionAttributableToNoncontrollingInterest [1]  
Reclassification adjustment for realized gains (losses) included in net earnings, attributable to shareholders (32)afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTaxPortionAttributableToParent (142)afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTaxPortionAttributableToParent  
Accumulated other comprehensive income, net unrealized gains on securities, beginning balance 563us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [2] 823us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [2] 578us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Other comprehensive income, net unrealized gains on securities, pretax 282us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax (410)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax 388us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
Other comprehensive income, net unrealized gains on securities, tax (99)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax 144us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax (136)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax
Total net unrealized gains (losses) on securities 183us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax (266)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 252us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Other comprehensive income, net unrealized gains on securities, attributable to noncontrolling interests (3)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest 6us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest (7)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest
Other comprehensive income, net unrealized gains on securities, attributable to shareholders 180us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent (260)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent 245us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Other change in accumulated other comprehensive income, available for sale securities adjustments 0afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentOtherChange 0afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentOtherChange 0afg_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentOtherChange [3]
Accumulated other comprehensive income, net unrealized gains on securities, ending balance 743us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [2] 563us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [2] 823us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax [2]
Accumulated other comprehensive income, foreign currency translation adjustments, beginning balance 1us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 14us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 10us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Other comprehensive income, foreign currency translation adjustments, pretax (9)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax (13)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax 6us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Other comprehensive income, foreign currency translation adjustments, net of tax (9)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (13)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 6us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Other comprehensive income, foreign currency translation adjustments, attributable to noncontrolling interests 0us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest 0us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest (1)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest
Other comprehensive income, foreign currency translation adjustments, attributable to shareholders (9)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (13)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent 5us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Other change in accumulated other comprehensive income, foreign currency translation adjustments 0afg_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentOtherChange 0afg_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentOtherChange (1)afg_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentOtherChange [3]
Accumulated other comprehensive income, foreign currency translation adjustments, ending balance (8)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 1us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax 14us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Accumulated other comprehensive income, pension and other postretirement plans adjustments, beginning balance (4)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (6)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (8)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Other comprehensive income, pension and other postretirement plans adjustments, pretax (6)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax 3us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax 2us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Other comprehensive income, pension and other postretirement plans adjustments, tax 2us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax (1)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax 0us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Other comprehensive income, pension and other postretirement plans adjustments, net of tax (4)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 2us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 2us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Other comprehensive income, pension and other postretirement plans adjustments, attributable to shareholders (4)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent 2us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent 2us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
Accumulated other comprehensive income, pension and other postretirement plans adjustments, ending balance (8)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (4)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (6)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Accumulated other comprehensive income, total, beginning balance 560us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 831us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 580us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other comprehensive income, total, pretax 267us-gaap_OtherComprehensiveIncomeLossBeforeTax (420)us-gaap_OtherComprehensiveIncomeLossBeforeTax 396us-gaap_OtherComprehensiveIncomeLossBeforeTax
Other comprehensive income, total, tax (97)us-gaap_OtherComprehensiveIncomeLossTax 143us-gaap_OtherComprehensiveIncomeLossTax (136)us-gaap_OtherComprehensiveIncomeLossTax
Other comprehensive income (loss), net of tax 170us-gaap_OtherComprehensiveIncomeLossNetOfTax (277)us-gaap_OtherComprehensiveIncomeLossNetOfTax 260us-gaap_OtherComprehensiveIncomeLossNetOfTax
Other comprehensive income, total, attributable to noncontrolling interests (3)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest 6us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest (8)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
Other comprehensive income, total, attributable to shareholders 167us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (271)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 252us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Other change in accumulated other comprehensive income, total 0afg_AccumulatedOtherComprehensiveIncomeLossOtherChange 0afg_AccumulatedOtherComprehensiveIncomeLossOtherChange (1)afg_AccumulatedOtherComprehensiveIncomeLossOtherChange [3]
Accumulated other comprehensive income, total, ending balance $ 727us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 560us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 831us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
[1] The reclassification adjustment out of net unrealized gains on securities affected the following lines in AFG’s Consolidated Statement of Earnings: OCI component Affected line in the Consolidated Statement of Earnings Pretax Realized gains on securities Tax Provision for income taxes Attributable to noncontrolling interests Net earnings (loss) attributable to noncontrolling interests
[2] Includes net unrealized gains of $58 million at December 31, 2014 compared to net unrealized gains of $54 million and $33 million at December 31, 2013 and 2012, related to securities for which only the credit portion of an other-than-temporary impairment has been recorded in earnings.
[3] Other relates to the 2012 acquisition of noncontrolling interest in a subsidiary.