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Fair Value Measurements (Details 3) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Liabilities of Managed Investment Entities [Member] |  |  |  |
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial liabilities, Beginning Balance | $ (2,701)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember |  | $ (2,411)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember |
Impact of accounting change | 2,701 afg_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityImpactofAccountingChange / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember | [1] |  |
Total realized/unrealized gains (losses) included in Net income | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember |  | 1 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember | [2]
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember |
Purchases and issuances | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember |  | (45)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember |
Sales and settlements | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember |  | 133 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember |
Transfer into Level 3 | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3 / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3 / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember |
Transfer out of Level 3 | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3 / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3 / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember |
Financial liabilities, Ending Balance | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember |  | (2,322)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = afg_LiabilityOfManagedInvestmentEntitiesMember |
Embedded derivatives [Member] |  |  |  |
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Financial liabilities, Beginning Balance | (1,160)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |  | (804)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |
Impact of accounting change | 0 afg_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityImpactofAccountingChange / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |  |  |
Total realized/unrealized gains (losses) included in Net income | (50)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |  | (54)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |
Total realized/unrealized gains (losses) included in other comprehensive income (loss) | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |
Purchases and issuances | (47)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |  | (55)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |
Sales and settlements | 14 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |  | 9 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |
Transfer into Level 3 | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3 / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3 / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |
Transfer out of Level 3 | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3 / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3 / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |
Financial liabilities, Ending Balance | $ (1,243)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |  | $ (904)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember |
[1] | The impact of implementing new guidance adopted in 2015, as discussed above and in Note A — “Accounting Policies — Managed Investment Entities.”
[2] | Total realized/unrealized gains (losses) included in net income includes gains of $4 million related to liabilities outstanding as of March 31, 2014. See Note H — “Managed Investment Entities.”

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