Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Unrealized gains on investments available-for-sale, net of tax	$ (72)	$ 317	$ 186
Amortization of pension actuarial loss and prior service cost, net of tax	(1)	7	6
Change in life deferred acquisition costs, life policy reserves and other, net of tax	$ 2	$ 1	$ (4)