Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 826	$ 166	$ 300
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	(580)	748	1,324
Pension and other postretirement benefits liability	(1)	(1)	(1)
Other comprehensive income (loss), before tax	(581)	747	1,323
Income tax expense (benefit) related to items of other comprehensive income (loss)	(122)	157	276
Other comprehensive income (loss), after tax	(459)	590	1,047
Comprehensive income (loss)	$ 367	$ 756	$ 1,347