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Managed Investment Entities - Selected financial information related to CLOs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Gains (losses) on change in fair value of assets/liabilities:
Assets	$ (74)	$ (57)
Liabilities	54	54
Management fees paid to AFG	2	3
Variable interest entity, primary beneficiary
Gains (losses) on change in fair value of assets/liabilities:
CLO earnings (losses) attributable to AFG	$ (13)	$ 2

X

- Definition

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

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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

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

+ 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

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

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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

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

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No definition available.

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Namespace Prefix:	afg_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Management fees paid by variable interest entities.

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No definition available.

+ Details

Name:	afg_ManagementFeesPaidByVariableInterestEntities
Namespace Prefix:	afg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: