Closed Block (Revenues and Expenses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Premiums	$ 1,498	$ 1,580	$ 1,672
Net investment income	1,596	1,740	1,758
Net investment gains (losses)	(25)	(7)	(71)
Net derivative gains (losses)	(17)	12	22
Total revenues	3,052	3,325	3,381
Expenses
Policyholder benefits and claims	2,330	2,291	2,475
Policyholder dividends	791	924	968
Other expenses	104	111	117
Total expenses	3,225	3,326	3,560
Revenues, net of expenses before provision for income tax expense (benefit)	(173)	(1)	(179)
Provision for income tax expense (benefit)	(36)	(2)	(39)
Revenues, net of expenses and provision for income tax expense (benefit)	$ (137)	$ 1	$ (140)