DAC, VOBA, DSI, and DFEL (DFEL) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in DFEL [Abstract]
Balance as of beginning-of-year	$ 1,445	$ 1,874	$ 1,952
Deferrals	875	755	631
Amortization, net of interest:
Amortization, excluding unlocking, net of interest	(482)	(396)	(365)
Unlocking	(53)	1	(63)
Adjustment related to realized (gains) losses	(20)	(14)	(3)
Adjustment related to unrealized (gains) losses	1,004	(775)	(278)
Balance as of end-of-year	$ 2,769	$ 1,445	$ 1,874