Condensed Financial Information of Parent Company - Condensed Statement of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Other Comprehensive Income [Abstract]
Net earnings (loss) attributable to shareholders	$ 1,995	$ 732	$ 897
Comprehensive income attributable to shareholders	841	1,146	1,712
AFG
Statement of Other Comprehensive Income [Abstract]
Net earnings (loss) attributable to shareholders	1,995	732	897
Other comprehensive income (loss), net of tax	(1,154)	414	815
Comprehensive income attributable to shareholders	$ 841	$ 1,146	$ 1,712