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Long-Term Debt - Schedule of long-term debt (Details) - USD ($) $ in Millions	Dec. 31, 2025	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Summary of Carrying value of long-term debt
Principal	$ 1,848		$ 1,498
Discount and Issue Costs	(28)		(23)
Carrying Value	1,820		1,475
AFG
Summary of Carrying value of long-term debt
Carrying Value	1,820		1,475
AFG | Senior Notes
Summary of Carrying value of long-term debt
Principal	1,173		823
Discount and Issue Costs	(10)		(5)
Carrying Value	1,163		818
AFG | Senior Notes | 4.50% Senior Notes due June 2047
Summary of Carrying value of long-term debt
Principal	567		567
Discount and Issue Costs	(1)		(1)
Carrying Value	$ 566		566
Interest rate on debt instruments	4.50%			4.50%
AFG | Senior Notes | 5.00% Senior Notes due September 2035
Summary of Carrying value of long-term debt
Principal	$ 350	$ 350	0
Discount and Issue Costs	(6)		0
Carrying Value	$ 344		0
Interest rate on debt instruments	5.00%	5.00%
AFG | Senior Notes | 5.25% Senior Notes due April 2030
Summary of Carrying value of long-term debt
Principal	$ 253		253
Discount and Issue Costs	(3)		(4)
Carrying Value	$ 250		249
Interest rate on debt instruments	5.25%			5.25%
AFG | Senior Notes | Other
Summary of Carrying value of long-term debt
Principal	$ 3		3
Discount and Issue Costs	0		0
Carrying Value	3		3
AFG | Subordinated Debentures
Summary of Carrying value of long-term debt
Principal	675		675
Discount and Issue Costs	(18)		(18)
Carrying Value	657		657
AFG | Subordinated Debentures | 4.50% Subordinated Debentures due September 2060
Summary of Carrying value of long-term debt
Principal	200		200
Discount and Issue Costs	(5)		(5)
Carrying Value	$ 195		195
Interest rate on debt instruments	4.50%
AFG | Subordinated Debentures | 5.125% Subordinated Debentures due December 2059
Summary of Carrying value of long-term debt
Principal	$ 200		200
Discount and Issue Costs	(5)		(5)
Carrying Value	$ 195		195
Interest rate on debt instruments	5.125%
AFG | Subordinated Debentures | 5.625% Subordinated Debentures due June 2060
Summary of Carrying value of long-term debt
Principal	$ 150		150
Discount and Issue Costs	(4)		(4)
Carrying Value	$ 146		146
Interest rate on debt instruments	5.625%
AFG | Subordinated Debentures | 5.875% Subordinated Debentures due March 2059
Summary of Carrying value of long-term debt
Principal	$ 125		125
Discount and Issue Costs	(4)		(4)
Carrying Value	$ 121		$ 121
Interest rate on debt instruments	5.875%

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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