Reserve for Life-Contingent Contract Benefits and Contractholder Funds (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Balance at beginning of period	$ 555	$ 673
Less reinsurance recoverables	255	458
Net balance at beginning of period	300	215
Incurred guarantee benefits	43	87
Paid guarantee benefits	0	(2)
Sold in LBL disposition	(227)
Net change	(184)	85
Net balance at end of period	116	300
Plus reinsurance recoverables	234	255
Balance at end of period	350	555
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	377	309
Less reinsurance recoverables	100	113
Net balance at beginning of period	277	196
Incurred guarantee benefits	34	83
Paid guarantee benefits	0	(2)
Sold in LBL disposition	(214)
Net change	(180)	81
Net balance at end of period	97	277
Plus reinsurance recoverables	98	100
Balance at end of period	195	377
Liability for guarantees related to income benefits
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Balance at beginning of period	113	235
Less reinsurance recoverables	99	220
Net balance at beginning of period	14	15
Incurred guarantee benefits	0	(1)
Paid guarantee benefits	0	0
Sold in LBL disposition	(10)
Net change	(10)	(1)
Net balance at end of period	4	14
Plus reinsurance recoverables	91	99
Balance at end of period	95	113
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	65	129
Less reinsurance recoverables	56	125
Net balance at beginning of period	9	4
Incurred guarantee benefits	9	5
Paid guarantee benefits	0	0
Sold in LBL disposition	(3)
Net change	6	5
Net balance at end of period	15	9
Plus reinsurance recoverables	45	56
Balance at end of period	$ 60	$ 65