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Managed Investment Entities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Gains (losses) on change in fair value of assets/liabilities: |  |  |  |  |
Assets | [1] | $ (7) | $ (1) | $ 26 | $ (2)
Liabilities | [1] | 5 | (9) | (31) | (8)
Management fees paid to AFG |  | 3 | 8 | 7 | 11
CLO earnings (losses) attributable to: |  |  |  |  |
AFG shareholders | [2] | 5 | 6 | 8 | 11
Noncontrolling interests | [2] | $ 0 | $ (18) | $ 0 | $ (18)
[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 Collateralized loan obligations' earnings (losses) attributable to. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Earnings (losses) of variable interest entities attributable to AFG shareholders. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Gain (loss) on change in fair value of assets of variable interest entities. + References No definition available. + Details
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- Definition Gain (loss) on change in fair value of liabilities of variable interest entities. + References No definition available. + Details
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Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Gains losses on change in fair value of assets liabilities collateralized loan obligations. + References No definition available. + Details
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- Definition Management fees paid by variable interest entities. + References No definition available. + Details
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Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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