Closed Block (Revenues and Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues
Premiums	$ 447	$ 461	$ 1,334	$ 1,380
Net investment income	487	516	1,500	1,568
Net investment gains (losses)	(9)	0	(8)	8
Net derivative gains (losses)	13	17	25	13
Total revenues	938	994	2,851	2,969
Expenses
Policyholder benefits and claims	635	620	1,886	1,889
Policyholder dividends	273	255	757	731
Other expenses	36	39	109	118
Total expenses	944	914	2,752	2,738
Revenues, net of expenses before provision for income tax expense (benefit)	(6)	80	99	231
Provision for income tax expense (benefit)	(1)	28	36	81
Revenues, net of expenses and provision for income tax expense (benefit)	$ (5)	$ 52	$ 63	$ 150