Closed Block (Revenues and Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues
Premiums	$ 436	$ 447	$ 1,297	$ 1,334
Net investment income	486	487	1,435	1,500
Net investment gains (losses)	(3)	(9)	(19)	(8)
Net derivative gains (losses)	4	13	(3)	25
Total revenues	923	938	2,710	2,851
Expenses
Policyholder benefits and claims	619	635	1,861	1,886
Policyholder dividends	232	273	723	757
Other expenses	33	36	100	109
Total expenses	884	944	2,684	2,752
Revenues, net of expenses before provision for income tax expense (benefit)	39	(6)	26	99
Provision for income tax expense (benefit)	13	(1)	8	36
Revenues, net of expenses and provision for income tax expense (benefit)	$ 26	$ (5)	$ 18	$ 63