Closed Block (Revenues and Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues
Premiums	$ 367	$ 367
Net investment income	407	428
Net investment gains (losses)	(19)	(1)
Net derivative gains (losses)	26	3
Total revenues	781	797
Expenses
Policyholder benefits and claims	550	539
Policyholder dividends	219	228
Other expenses	27	29
Total expenses	796	796
Revenues, net of expenses before provision for income tax expense (benefit)	(15)	1
Provision for income tax expense (benefit)	(3)	0
Revenues, net of expenses and provision for income tax expense (benefit)	$ (12)	$ 1