Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 828	$ 473
Other comprehensive income:
Change in gross unrealized investment gains/losses	(320)	(92)
Effect of income taxes	73	22
Total change in unrealized investment gains/losses, net of tax	(247)	(70)
Reclassification adjustment for net realized gains	(55)	(45)
Effect of income taxes	13	10
Total reclassification adjustment, net of tax	(42)	(35)
Other comprehensive loss, net of tax	(289)	(105)
Comprehensive income (loss) attributable to equity method investments	6	(3)
Comprehensive income	$ 545	$ 365