Condensed Financial Information of Parent Company - Condensed Statement of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Other Comprehensive Income [Abstract]
Net earnings	$ 887	$ 852	$ 898
Other comprehensive income (loss)	79	224	(662)
Comprehensive income	966	1,076	236
AFG
Statement of Other Comprehensive Income [Abstract]
Net earnings	887	852	898
Other comprehensive income (loss)	79	224	(662)
Comprehensive income	$ 966	$ 1,076	$ 236