Closed Block (Revenues and Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues
Premiums	$ 402	$ 417
Net investment income	466	480
Net investment gains (losses)	(8)	(28)
Net derivative gains (losses)	(8)	(11)
Total revenues	852	858
Expenses
Policyholder benefits and claims	568	610
Policyholder dividends	250	245
Other expenses	32	32
Total expenses	850	887
Revenues, net of expenses before provision for income tax expense (benefit)	2	(29)
Provision for income tax expense (benefit)	0	(11)
Revenues, net of expenses and provision for income tax expense (benefit)	$ 2	$ (18)