DAC, VOBA, DSI, and DFEL (VOBA) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in VOBA [Roll Forward]
Balance as of beginning-of-year	$ 247	$ 342	$ 816
Business acquired (sold) through reinsurance	(288)
Deferrals		3	6
Amortization:
Amortization, excluding unlocking	(94)	(105)	(114)
Unlocking	(7)	(205)	140
Accretion of interest	33	44	45
Adjustment related to realized (gains) losses	(3)		(1)
Adjustment related to unrealized (gains) losses	305	168	(550)
Balance as of end-of-year	$ 193	$ 247	$ 342
Interest accrual rate, low end	4.20%	4.20%	4.20%
Interest accrual rate, high end	6.90%	6.90%	6.90%