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Fair Value Measurements (Details 4) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Liabilities of Managed Investment Entities [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Financial liabilities, Beginning Balance $ (2,411)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 $ (2,745)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 $ (2,593)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember
Total realized/unrealized gains (losses) included in Net income 22us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 [1] (25)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 [2] (189)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 [3]
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember
Purchases and issuances (817)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 (728)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 (793)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember
Sales and settlements 505us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 1,068us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 830us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember
Transfers into Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember
Transfers out of Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 19us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember
Financial liabilities, Ending Balance (2,701)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 (2,411)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember		 (2,745)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= afg_LiabilityOfManagedInvestmentEntitiesMember
Embedded derivatives [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Financial liabilities, Beginning Balance (804)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 (465)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 (361)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Total realized/unrealized gains (losses) included in Net income (182)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 [4] (182)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 [5] (57)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 [6]
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Purchases and issuances (221)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 (192)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 (73)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Sales and settlements 47us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 35us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 26us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Transfers into Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Transfers out of Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
Financial liabilities, Ending Balance $ (1,160)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 $ (804)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember		 $ (465)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
[1] Total realized/unrealized gains (losses) included in net income includes gains of $50 million related to liabilities outstanding as of December 31, 2014. See Note H — “Managed Investment Entities.”
[2] Total realized/unrealized gains (losses) included in net income includes gains of $7 million related to liabilities outstanding as of December 31, 2013. See Note H — “Managed Investment Entities.”
[3] Total realized/unrealized gains (losses) included in net income includes losses of $125 million related to liabilities outstanding as of December 31, 2012. See Note H — “Managed Investment Entities.”
[4] Total realized/unrealized gains (losses) included in net income for the embedded derivatives reflects gains related to the unlocking of actuarial assumptions of $58 million in 2014.
[5] Total realized/unrealized gains (losses) included in net income for the embedded derivatives reflects gains related to the unlocking of actuarial assumptions of $2 million in 2013.
[6] Total realized/unrealized gains (losses) included in net income for the embedded derivatives reflects gains related to the unlocking of actuarial assumptions of $36 million in 2012.