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Shareholders' Equity (Details 1) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Components of accumulated other comprehensive income |  |  |  |
Unrealized holding gains (losses) on securities arising during the period, pretax | $ 106 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax |  | $ 211 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax |
Unrealized holding gains (losses) on securities arising during the period, tax | (37)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax |  | (74)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax |
Unrealized holding gains (losses) on securities arising during the period, net of tax | 69 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  | 137 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |
Unrealized holding gains (losses) on securities arising during the period, attributable to noncontrolling interests | (1)afg_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTaxPortionAttributableToNoncontrollingInterest |  | (3)afg_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTaxPortionAttributableToNoncontrollingInterest |
Unrealized holding gains (losses) on securities arising during the period, attributable to shareholders | 68 afg_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTaxPortionAttributableToParent |  | 134 afg_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTaxPortionAttributableToParent |
Reclassification adjustment for realized (gains) losses included in net earnings, pretax | (19)afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeBeforeTax | [1] | (18)afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeBeforeTax | [1]
Reclassification adjustment for realized (gains) losses included in net earnings, tax | 7 afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeTax | [1] | 6 afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeTax | [1]
Reclassification adjustment for realized (gains) losses included in net earnings, net of tax | (12)afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTax |  | (12)afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTax |
Reclassification adjustment for realized (gains) losses included in net earnings, attributable to noncontrolling interests | 0 afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTaxPortionAttributableToNoncontrollingInterest | [1] |  |
Reclassification adjustment for realized (gains) losses included in net earnings, attributable to shareholders | (12)afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTaxPortionAttributableToParent |  | (12)afg_OtherComprehensiveIncomeLossReclassificationAdjustmentForRealizedGainsLossesIncludedInNetIncomeNetOfTaxPortionAttributableToParent |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Accumulated other comprehensive income, net unrealized gains on securities, beginning balance | 743 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | [2] | 563 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |
Other comprehensive income, net unrealized gains on securities, pretax | 87 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax |  | 193 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax |
Other comprehensive income, net unrealized gains on securities, tax | (30)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax |  | (68)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax |
Total net unrealized gains on securities | 57 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |  | 125 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |
Other comprehensive income, net unrealized gains on securities, attributable to noncontrolling interests | (1)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest |  | (3)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest |
Other comprehensive income, net unrealized gains on securities, attributable to shareholders | 56 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent |  | 122 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent |
Accumulated other comprehensive income, net unrealized gains on securities, ending balance | 799 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | [2] | 685 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |
Accumulated other comprehensive income, net unrealized gains (losses) on cash flow hedges, beginning balance | 0 us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax |  |  |
Other comprehensive income, net unrealized gains (losses) on cash flow hedges, pretax | 1 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax |  |  |
Other comprehensive income, net unrealized gains (losses) on cash flow hedges, tax | 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax |  |  |
Other comprehensive income, net unrealized gains (losses) on cash flow hedges, net of tax | 1 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax |  | 0 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax |
Other comprehensive income, net unrealized gains (losses) on cash flow hedges, attributable to noncontrolling interests | 0 us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToNoncontrollingInterest |  |  |
Other comprehensive income, net unrealized gains (losses) on cash flow hedges, attributable to shareholders | 1 us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent |  |  |
Accumulated other comprehensive income, net unrealized gains (losses) on cash flow hedges, ending balance | 1 us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax |  |  |
Accumulated other comprehensive income, foreign currency translation adjustments, beginning balance | (8)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |  | 1 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |
Other comprehensive income, foreign currency translation adjustments, pretax | (8)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax |  | (5)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax |
Other comprehensive income, foreign currency translation adjustments, net of tax | (8)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  | (5)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |
Other comprehensive income, foreign currency translation adjustments, attributable to noncontrolling interests | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest |  | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest |
Other comprehensive income, foreign currency translation adjustments, attributable to shareholders | (8)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent |  | (5)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent |
Accumulated other comprehensive income, foreign currency translation adjustments, ending balance | (16)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |  | (4)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |
Accumulated other comprehensive income, pension and other postretirement plans adjustments, beginning balance | (8)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax |  | (4)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax |
Other comprehensive income, pension and other postretirement plans adjustments, pretax | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax |  | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax |
Other comprehensive income, pension and other postretirement plans adjustments, tax | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax |  | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax |
Other comprehensive income, pension and other postretirement plans adjustments, net of tax | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax |  | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax |
Other comprehensive income, pension and other postretirement plans adjustments, attributable to shareholders | 0 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent |  | 0 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent |
Accumulated other comprehensive income, pension and other postretirement plans adjustments, ending balance | (8)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax |  | (4)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax |
Accumulated other comprehensive income, total, beginning balance | 727 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  | 560 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Other comprehensive income, total, pretax | 80 us-gaap_OtherComprehensiveIncomeLossBeforeTax |  | 188 us-gaap_OtherComprehensiveIncomeLossBeforeTax |
Other comprehensive income, total, tax | (30)us-gaap_OtherComprehensiveIncomeLossTax |  | (68)us-gaap_OtherComprehensiveIncomeLossTax |
Other comprehensive income, net of tax | 50 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  | 120 us-gaap_OtherComprehensiveIncomeLossNetOfTax |
Other comprehensive income, total, attributable to noncontrolling interests | (1)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest |  | (3)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest |
Other comprehensive income, total, attributable to shareholders | 49 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  | 117 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |
Accumulated other comprehensive income, total, ending balance | $ 776 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  | $ 677 us-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 $57 million at March 31, 2015 compared to $58 million at December 31, 2014 related to securities for which only the credit portion of an other-than-temporary impairment has been recorded in earnings.

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- Definition Reclassification adjustment for unrealized gains or losses realized upon the sale and write-down of securities, after tax, attributable to noncontrolling interest. + References No definition available. + Details
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