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v3.25.1

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, 2025 | Mar. 31, 2024
Variable Interest Entity, Ownership [Roll Forward] |  |
Balance at beginning of period of ownership of CLO tranches | $ 125 | $ 137
Purchases | 35 | 28
Sales | (30) | 0
Distributions | (9) | (9)
Change in fair value | 0 | 13
Change in accrued interest | 1 | 0
Balance at end of period of ownership of CLO tranches | $ 122 | $ 169

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

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- Definition Change in accrued interest of managed investment entities liabilities that are owned by the company + References No definition available. + Details
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Namespace Prefix: | afg_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Change in fair value of ownership of managed investment entities liabilities + 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_
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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Balance Type: |
Period Type: |