Closed Block (Revenues and Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues
Premiums	$ 320	$ 367
Net investment income	393	407
Net investment gains (losses)	6	(19)
Net derivative gains (losses)	1	26
Total revenues	720	781
Expenses
Policyholder benefits and claims	546	550
Policyholder dividends	178	219
Other expenses	25	27
Total expenses	749	796
Revenues, net of expenses before provision for income tax expense (benefit)	(29)	(15)
Provision for income tax expense (benefit)	(6)	(3)
Revenues, net of expenses and provision for income tax expense (benefit)	$ (23)	$ (12)