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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 | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Variable Interest Entity, Ownership [Roll Forward] |  |  |  |
Balance at beginning of period of ownership of CLO tranches | $ 119 | $ 89 | $ 112 | $ 76
Purchases | 0 | 15 | 11 | 33
Sales | 0 | 0 | 0 | 0
Distributions | (7) | (6) | (12) | (9)
Change in fair value | 5 | (13) | 6 | (15)
Balance at end of period of ownership of CLO tranches | $ 117 | $ 85 | $ 117 | $ 85

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- Definition Amount of managed investment entities liabilities purchased during the period + References No definition available. + Details
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Balance Type: | credit
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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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- Definition Proceeds received from distributions of managed investment entities liabilities. + References No definition available. + Details
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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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- Definition Progression of the ownership of variable interest entities + References No definition available. + Details
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Namespace Prefix: | afg_
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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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- Details
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