Closed Block (Revenues and Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues
Premiums	$ 417	$ 430
Net investment income	480	515
Net investment gains (losses)	(28)	(1)
Net derivative gains (losses)	(11)	25
Total revenues	858	969
Expenses
Policyholder benefits and claims	610	608
Policyholder dividends	245	240
Other expenses	32	37
Total expenses	887	885
Revenues, net of expenses before provision for income tax expense (benefit)	(29)	84
Provision for income tax expense (benefit)	(11)	29
Revenues, net of expenses and provision for income tax expense (benefit)	$ (18)	$ 55