Reserve for Life-Contingent Contract Benefits and Contractholder Funds (Details 5) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Balance at beginning of period	$ 350	$ 555
Less reinsurance recoverables	234	255
Net balance at beginning of period	116	300
Incurred guarantee benefits	28	43
Paid guarantee benefits	0	0
Sold in LBL disposition		(227)
Net change	28	(184)
Net balance at end of period	144	116
Plus reinsurance recoverables	222	234
Balance at end of period	366	350
Liability for guarantees related to death benefits and interest-sensitive life products
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Balance at beginning of period	195	377
Less reinsurance recoverables	98	100
Net balance at beginning of period	97	277
Incurred guarantee benefits	20	34
Paid guarantee benefits	0	0
Sold in LBL disposition		(214)
Net change	20	(180)
Net balance at end of period	117	97
Plus reinsurance recoverables	106	98
Balance at end of period	223	195
At annuitization (includes income benefit guarantees)
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Balance at beginning of period	95	113
Less reinsurance recoverables	91	99
Net balance at beginning of period	4	14
Incurred guarantee benefits	0	0
Paid guarantee benefits	0	0
Sold in LBL disposition		(10)
Net change	0	(10)
Net balance at end of period	4	4
Plus reinsurance recoverables	64	91
Balance at end of period	68	95
Liability for guarantees related to accumulation and withdrawal benefits
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Balance at beginning of period	60	65
Less reinsurance recoverables	45	56
Net balance at beginning of period	15	9
Incurred guarantee benefits	8	9
Paid guarantee benefits	0	0
Sold in LBL disposition		(3)
Net change	8	6
Net balance at end of period	23	15
Plus reinsurance recoverables	52	45
Balance at end of period	$ 75	$ 60