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Managed Investment Entities (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Gains (losses) on change in fair value of assets/liabilities: |  |  |
Assets | [1] | $ (1) | $ 33
Liabilities | [1] | (12) | (36)
Management fees paid to AFG |  | 4 | 4
CLO earnings (losses) attributable to AFG shareholders | [2] | $ (7) | $ 3
[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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- Definition Gains losses on change in fair value of assets liabilities collateralized loan obligations. + References No definition available. + 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