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DAC, VOBA, DSI, and DFEL (DAC) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in DAC [Roll Forward]
Balance as of beginning-of-year	$ 7,352	$ 9,448	$ 7,887
Business acquired (sold) through reinsurance	(10)		(246)
Deferrals	1,446	1,902	1,600
Amortization, net of interest:
Amortization, excluding unlocking, net of interest	(796)	(950)	(951)
Unlocking	(231)	(489)	(115)
Adjustment related to realized gains (losses)	(19)	54	(47)
Adjustment related to unrealized gains (losses)	(2,182)	(2,613)	1,320
Balance as of end-of-year	5,565	$ 7,352	$ 9,448
Cumulative Effect, Period of Adoption, Adjustment [Member]
Amortization, net of interest:
Balance as of end-of-year	$ 5

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