Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 940	$ 193	$ 1,506	$ 684
Other comprehensive income:
Change in gross unrealized investment gains/losses	169	(9)	365	(212)
Effect of income taxes	(40)	2	(85)	54
Total change in unrealized investment gains/losses, net of tax	129	(7)	280	(158)
Reclassification adjustment for net realized gains	(6)	(23)	(6)	(52)
Effect of income taxes	2	8	2	15
Total reclassification adjustment, net of tax	(4)	(15)	(4)	(37)
Other comprehensive income (loss), net of tax	125	(22)	276	(195)
Comprehensive loss attributable to equity method investment in Kindred at Home	(3)	0	(5)	0
Comprehensive income	$ 1,062	$ 171	$ 1,777	$ 489