Condensed Financial Information of Parent Company - Condensed Statement of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Other Comprehensive Income [Abstract]
Net earnings attributable to shareholders	$ 898	$ 1,995	$ 732
Comprehensive income attributable to shareholders	236	841	1,146
AFG
Statement of Other Comprehensive Income [Abstract]
Net earnings attributable to shareholders	898	1,995	732
Other comprehensive income (loss), net of tax	(662)	(1,154)	414
Comprehensive income attributable to shareholders	$ 236	$ 841	$ 1,146