XML 129 R102.htm IDEA: XBRL DOCUMENT v3.25.4

Additional Information - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Commitments to fund credit facilities and limited partnerships	$ 616
Retirement and employee savings plan expense	$ 71	$ 68	$ 63

X

- Definition

Represents commitments to fund credit facilities and contribute capital to certain limited partnership investments at a future date.

+ References

No definition available.

+ Details

Name:	afg_UnfundedCommitmentsToCreditFacilitiesAndLimitedPartnerships
Namespace Prefix:	afg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cost (reversal of cost) for other postretirement benefits. Excludes pension benefits.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherPostretirementBenefitExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration