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Insurance - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Insurance [Line Items]
Workers' compensation insurance discount rate	4.50%	4.50%
Amortization of deferred policy acquisition costs	$ 775	$ 766	$ 720
Carrying value of cash and securities owned by U.S.-based insurance subsidiaries on deposit	1,230
Dividends	608	791	$ 687
Dividends payments without violating the most restrictive debt covenants, minimum	1,800
Maximum
Insurance [Line Items]
Maximum amount of dividends available to be paid by insurance subsidiaries to AFG without prior approval of regulatory authorities	1,080
Workers' Compensation Insurance
Insurance [Line Items]
Impact of discount on workers' compensation policies	$ 8
Impact of discount on workers' compensation policies, prior year amount		$ 8

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