Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 1,340	$ 689	$ 3,641	$ 2,195
Other comprehensive income:
Change in gross unrealized investment gains/losses	66	87	332	452
Effect of income taxes	(15)	(20)	(78)	(105)
Total change in unrealized investment gains/losses, net of tax	51	67	254	347
Reclassification adjustment for net realized gains	(1)	(1)	(48)	(7)
Effect of income taxes	0	0	10	2
Total reclassification adjustment, net of tax	(1)	(1)	(38)	(5)
Other comprehensive income, net of tax	50	66	216	342
Comprehensive income (loss) attributable to equity method investments	3	(1)	(2)	(6)
Comprehensive income	$ 1,393	$ 754	$ 3,855	$ 2,531