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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
	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

X

- Definition

Amount of managed investment entities liabilities purchased during the period

+ References

No definition available.

+ Details

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- Definition

Earnings (losses) of variable interest entities attributable to AFG shareholders.

+ 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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Namespace Prefix:	afg_
Data Type:	xbrli:monetaryItemType
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X

- 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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- 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

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- Details

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