Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 32	$ 383
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	(1,418)	(758)
Other comprehensive income (loss), before tax	(1,418)	(758)
Income tax expense (benefit) related to items of other comprehensive income (loss)	(298)	(159)
Other comprehensive income (loss), after tax	(1,120)	(599)
Comprehensive income (loss)	$ (1,088)	$ (216)