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Managed Investment Entities - Progression of investment in CLO tranches (Details) - Variable interest entity, primary beneficiary - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Variable Interest Entity, Ownership [Roll Forward] |  |
Balance at beginning of period of ownership of CLO tranches | $ 143 | $ 175
Purchases | 11 | 35
Sales | 0 | (79)
Distributions | (8) | (11)
CLO earnings (losses) attributable to AFG | (13) | 2
Balance at end of period of ownership of CLO tranches | $ 133 | $ 122

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- Definition Amount of managed investment entities liabilities purchased during the period + References No definition available. + Details
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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
Name: | afg_EarningsLossesOfVariableInterestEntitiesAttributableToShareholders
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Proceeds received from distributions of managed investment entities liabilities. + References No definition available. + Details
Name: | afg_ProceedsReceivedFromDistributionsOfManagedInvestmentEntitiesLiabilities
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds received related to sales of managed investment entities liabilities during the period + References No definition available. + Details
Name: | afg_ProceedsReceivedRelatedToSalesOfManagedInvestmentEntitiesLiabilities
Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Progression of the ownership of variable interest entities + References No definition available. + Details
Name: | afg_VariableInterestEntityOwnershipRollForward
Namespace Prefix: | afg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of maximum exposure to loss from involvement with consolidated variable interest entity (VIE). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 810 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481203/810-10-50-5A + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |