Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 689	$ 644	$ 2,195	$ 1,328
Other comprehensive income:
Change in gross unrealized investment gains/losses	87	(42)	452	(254)
Effect of income taxes	(20)	10	(105)	64
Total change in unrealized investment gains/losses, net of tax	67	(32)	347	(190)
Reclassification adjustment for net realized gains	(1)	3	(7)	(49)
Effect of income taxes	0	(1)	2	14
Total reclassification adjustment, net of tax	(1)	2	(5)	(35)
Other comprehensive income (loss), net of tax	66	(30)	342	(225)
Comprehensive loss attributable to equity method investment in Kindred at Home	(1)	0	(6)	0
Comprehensive income	$ 754	$ 614	$ 2,531	$ 1,103