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Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Gains (losses) on change in fair value of assets/liabilities: |  |  |  |
Assets | $ (6) | $ (7) | $ (51) | $ (10)
Liabilities | 6 | (2) | 44 | 15
Management fees paid to AFG | 3 | 3 | 8 | 9
Variable interest entity, primary beneficiary |  |  |  |
Gains (losses) on change in fair value of assets/liabilities: |  |  |  |
CLO earnings attributable to AFG | $ 6 | $ 2 | $ 10 | $ 25

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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: |