Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 108	$ 170	$ 162	$ 739
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	(932)	(97)	(3,694)	(409)
Other comprehensive income (loss), before tax	(932)	(97)	(3,694)	(410)
Income tax expense (benefit) related to items of other comprehensive income (loss)	(196)	(20)	(776)	(86)
Other comprehensive income (loss), after tax	(736)	(77)	(2,918)	(324)
Comprehensive income (loss)	(628)	93	(2,756)	415
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	$ 0	$ 0	$ 0	$ (1)