Condensed Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 234	$ 430
Other comprehensive income:
Change in gross unrealized investment gains/losses	48	14
Effect of income taxes	(17)	(5)
Total change in unrealized investment gains/losses, net of tax	31	9
Reclassification adjustment for net realized gains included in investment income	(20)	(9)
Effect of income taxes	7	4
Total reclassification adjustment, net of tax	(13)	(5)
Other comprehensive income, net of tax	18	4
Comprehensive income	$ 252	$ 434