DAC, VOBA, DSI, and DFEL (DFEL) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in DFEL [Abstract]
Balance as of beginning-of-year	$ 2,769	$ 1,445	$ 1,874
Deferrals	1,095	875	755
Amortization, net of interest:
Amortization, excluding unlocking, net of interest	(544)	(482)	(396)
Unlocking	(426)	(53)	1
Adjustment related to realized (gains) losses		(20)	(14)
Adjustment related to unrealized (gains) losses	(2,244)	1,004	(775)
Balance as of end-of-year	$ 650	$ 2,769	$ 1,445