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Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Gains (losses) on change in fair value of assets/liabilities:
Assets	$ (6)	$ (7)	$ (51)	$ (10)
Liabilities	6	(2)	44	15
Management fees paid to AFG	3	3	8	9
Variable interest entity, primary beneficiary
Gains (losses) on change in fair value of assets/liabilities:
CLO earnings attributable to AFG	$ 6	$ 2	$ 10	$ 25

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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

Gain (loss) on change in fair value of assets of variable interest entities.

+ References

No definition available.

+ Details

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- Definition

Gain (loss) on change in fair value of liabilities of variable interest entities.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Gains losses on change in fair value of assets liabilities collateralized loan obligations.

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No definition available.

+ Details

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- Definition

Management fees paid by variable interest entities.

+ References

No definition available.

+ Details

Name:	afg_ManagementFeesPaidByVariableInterestEntities
Namespace Prefix:	afg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Details

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