Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Unrealized gains on investments available-for-sale, net of tax	$ 186	$ (220)	$ 134
Amortization of pension actuarial loss and prior service cost, net of tax	6	(2)	(6)
Change in life deferred acquisition costs, life policy reserves and other, net of tax	$ (4)	$ 4	$ 2