Closed Block (Revenues and Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues
Premiums	$ 457	$ 473	$ 887	$ 919
Net investment income	498	522	1,013	1,052
Net investment gains (losses)	2	8	1	8
Net derivative gains (losses)	(13)	(3)	12	(4)
Total revenues	944	1,000	1,913	1,975
Expenses
Policyholder benefits and claims	643	645	1,251	1,269
Policyholder dividends	244	243	484	476
Other expenses	36	38	73	79
Total expenses	923	926	1,808	1,824
Revenues, net of expenses before provision for income tax expense (benefit)	21	74	105	151
Provision for income tax expense (benefit)	8	26	37	53
Revenues, net of expenses and provision for income tax expense (benefit)	$ 13	$ 48	$ 68	$ 98