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Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Gains (losses) on change in fair value of assets/liabilities: |  |  |  |
Assets | $ (15) | $ 32 | $ (3) | $ 66
Liabilities | 19 | (32) | 17 | (70)
Management fees paid to AFG | 3 | 4 | 6 | 8
Variable interest entity, primary beneficiary |  |  |  |
Gains (losses) on change in fair value of assets/liabilities: |  |  |  |
CLO earnings attributable to AFG | $ 9 | $ 5 | $ 23 | $ 6

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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

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- Details
Name: | srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |