Condensed Financial Information of Parent Company - Condensed Statement of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Other Comprehensive Income [Abstract]
Net earnings	$ 852	$ 898	$ 1,995
Comprehensive income	1,076	236	841
AFG
Statement of Other Comprehensive Income [Abstract]
Net earnings	852	898	1,995
Other comprehensive income (loss), net of tax	224	(662)	(1,154)
Comprehensive income	$ 1,076	$ 236	$ 841