Closed Block (Revenues and Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues
Premiums	$ 444	$ 457	$ 861	$ 887
Net investment income	469	498	949	1,013
Net investment gains (losses)	12	2	(16)	1
Net derivative gains (losses)	4	(13)	(7)	12
Total revenues	929	944	1,787	1,913
Expenses
Policyholder benefits and claims	632	643	1,242	1,251
Policyholder dividends	246	244	491	484
Other expenses	35	36	67	73
Total expenses	913	923	1,800	1,808
Revenues, net of expenses before provision for income tax expense (benefit)	16	21	(13)	105
Provision for income tax expense (benefit)	6	8	(5)	37
Revenues, net of expenses and provision for income tax expense (benefit)	$ 10	$ 13	$ (8)	$ 68