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Managed Investment Entities (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Gains (losses) on change in fair value of assets/liabilities: |  |  |  |
Assets | $ 33 afg_GainLossOnChangeInFairValueOfAssetsOfVariableInterestEntities | [1] | $ (1)afg_GainLossOnChangeInFairValueOfAssetsOfVariableInterestEntities | [1]
Liabilities | (36)afg_GainLossOnChangeInFairValueOfLiabilitiesOfVariableInterestEntities | [1] | 1 afg_GainLossOnChangeInFairValueOfLiabilitiesOfVariableInterestEntities | [1]
Management fees paid to AFG | 4 afg_ManagementFeesPaidByVariableInterestEntities |  | 3 afg_ManagementFeesPaidByVariableInterestEntities |
CLO earnings attributable to AFG shareholders | $ 3 afg_EarningsLossesOfVariableInterestEntitiesAttributableToShareholders | [2] | $ 5 afg_EarningsLossesOfVariableInterestEntitiesAttributableToShareholders | [2]
[1] | Included in Revenues in AFG’s Statement of Earnings.
[2] | Included in Earnings before income taxes in AFG’s Statement of Earnings.

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- Definition Earnings (losses) of variable interest entities attributable to AFG shareholders. + References No definition available. + Details
Name: | afg_EarningsLossesOfVariableInterestEntitiesAttributableToShareholders
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Gain (loss) on change in fair value of assets of variable interest entities. + References No definition available. + Details
Name: | afg_GainLossOnChangeInFairValueOfAssetsOfVariableInterestEntities
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Gain (loss) on change in fair value of liabilities of variable interest entities. + References No definition available. + Details
Name: | afg_GainLossOnChangeInFairValueOfLiabilitiesOfVariableInterestEntities
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | afg_GainsLossesOnChangeInFairValueOfAssetsLiabilitiesOfCollateralizedLoanObligationsAbstract
Namespace Prefix: | afg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Management fees paid by variable interest entities. + References No definition available. + Details
Name: | afg_ManagementFeesPaidByVariableInterestEntities
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration