Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 333	$ 826	$ 166
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	(3,514)	(580)	748
Pension and other postretirement benefits liability	0	(1)	(1)
Other comprehensive income (loss), before tax	(3,514)	(581)	747
Income tax expense (benefit) related to items of other comprehensive income (loss)	(738)	(122)	157
Other comprehensive income (loss), after tax	(2,776)	(459)	590
Comprehensive income (loss)	$ (2,443)	$ 367	$ 756