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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 | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Variable Interest Entity, Ownership [Roll Forward] |  |  |  |
Balance at beginning of period of ownership of CLO tranches | $ 148 | $ 159 | $ 175 | $ 177
Purchases | 55 | 10 | 130 | 94
Sales | (58) | 0 | (146) | (100)
Distributions | (13) | (7) | (31) | (32)
CLO earnings attributable to AFG | 6 | 2 | 10 | 25
Balance at end of period of ownership of CLO tranches | $ 138 | $ 164 | $ 138 | $ 164

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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
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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
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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
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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
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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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Period Type: | instant

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