Closed Block (Revenues and Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Premiums	$ 390	$ 410	$ 757	$ 797
Net investment income	447	431	875	875
Net investment gains (losses)	(4)	(24)	(5)	(53)
Net derivative gains (losses)	9	13	12	10
Total revenues	842	830	1,639	1,629
Expenses
Policyholder benefits and claims	563	596	1,102	1,167
Policyholder dividends	231	238	459	482
Other expenses	28	30	57	59
Total expenses	822	864	1,618	1,708
Revenues, net of expenses before provision for income tax expense (benefit)	20	(34)	21	(79)
Provision for income tax expense (benefit)	4	(7)	4	(17)
Revenues, net of expenses and provision for income tax expense (benefit)	$ 16	$ (27)	$ 17	$ (62)