Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$ 591	$ 634	$ 525
Other Comprehensive Income
Change in unrealized gains and losses on investments, net of tax of $186, $(220) and $134, respectively	345	(405)	250
Amortization of pension actuarial gains and losses and prior service cost, net of tax of $6, $(2) and $(6), respectively	10	(4)	(12)
Change in life deferred acquisition costs, life policy reserves and other, net of tax of $(4), $4 and $2, respectively	(6)	9	2
Other comprehensive income (loss)	349	(400)	240
Comprehensive Income	$ 940	$ 234	$ 765