Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 3	$ 450	$ 211	$ 988
Other comprehensive income (loss), net of tax:
Unrealized losses on debt securities	(264)	(42)	(902)	(105)
Foreign currency translation adjustment	(35)	(13)	(58)	(4)
Pension benefit adjustment	1	1	4	3
Total other comprehensive loss, net of tax	(298)	(54)	(956)	(106)
Comprehensive (loss) income	(295)	396	(745)	882
Less: Comprehensive income attributable to noncontrolling interests	1	5	2	7
Comprehensive (loss) income attributable to the Company	$ (296)	$ 391	$ (747)	$ 875