Closed Block (Revenues and Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues
Premiums	$ 367	$ 387
Net investment income	428	444
Net investment gains (losses)	(1)	(29)
Net derivative gains (losses)	3	(3)
Total revenues	797	799
Expenses
Policyholder benefits and claims	539	571
Policyholder dividends	228	244
Other expenses	29	29
Total expenses	796	844
Revenues, net of expenses before provision for income tax expense (benefit)	1	(45)
Provision for income tax expense (benefit)	0	(10)
Revenues, net of expenses and provision for income tax expense (benefit)	$ 1	$ (35)