DAC, VOBA, DSI, and DFEL (DAC) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in DAC [Roll Forward]
Balance as of beginning-of-year	$ 5,565	$ 7,352	$ 9,448
Business acquired (sold) through reinsurance	(362)	(10)
Deferrals	1,373	1,446	1,902
Amortization, net of interest:
Amortization, excluding unlocking, net of interest	(1,001)	(796)	(950)
Unlocking	(565)	(231)	(489)
Adjustment related to realized gains (losses)	86	(19)	54
Adjustment related to unrealized gains (losses)	792	(2,182)	(2,613)
Balance as of end-of-year	5,888	5,565	$ 7,352
Cumulative Effect, Period of Adoption, Adjustment [Member]
Changes in DAC [Roll Forward]
Balance as of beginning-of-year	$ 5
Amortization, net of interest:
Balance as of end-of-year		$ 5