DAC, VOBA, DSI, and DFEL (DSI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in DSI [Roll Forward]
Balance as of beginning-of-year	$ 240	$ 267	$ 253
Deferrals	29	13	10
Amortization, net of interest:
Amortization, excluding unlocking, net of interest	(33)	(38)	(43)
Unlocking	2	2	8
Adjustment related to realized (gains) losses	(1)	(4)	(1)
Adjustment related to unrealized (gains) losses	19		40
Balance as of end-of-year	$ 256	$ 240	$ 267