Condensed Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 311	$ 431	$ 565	$ 861
Other comprehensive income:
Change in gross unrealized investment gains/losses	111	(87)	159	(73)
Effect of income taxes	(41)	32	(58)	27
Total change in unrealized investment gains/losses, net of tax	70	(55)	101	(46)
Reclassification adjustment for net realized gains included in investment income	(19)	(28)	(39)	(37)
Effect of income taxes	7	9	14	13
Total reclassification adjustment, net of tax	(12)	(19)	(25)	(24)
Other comprehensive income, net of tax	58	(74)	76	(70)
Comprehensive income	$ 369	$ 357	$ 641	$ 791