Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 1,828	$ 940	$ 2,301	$ 1,506
Other comprehensive income:
Change in gross unrealized investment gains/losses	358	169	266	365
Effect of income taxes	(85)	(40)	(63)	(85)
Total change in unrealized investment gains/losses, net of tax	273	129	203	280
Reclassification adjustment for net realized gains	(2)	(6)	(47)	(6)
Effect of income taxes	0	2	10	2
Total reclassification adjustment, net of tax	(2)	(4)	(37)	(4)
Other comprehensive income, net of tax	271	125	166	276
Comprehensive loss attributable to equity method investments	(2)	(3)	(5)	(5)
Comprehensive income	$ 2,097	$ 1,062	$ 2,462	$ 1,777