Reinsurance - Guaranteed Minimum Death Benefit Contracts, Future Policy Benefits (Details) - Variable Annuity [Member] - Guaranteed Minimum Death Benefit [Member] - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Activity in future policy benefits reserves for GMDB business [Line Items]
Future Policy Benefit Reserve, beginning balance, gross	$ 1,270	$ 1,396
Costs payable, beginning balance, gross	16	18
Less: Reinsurance and other amounts recoverable	1,186	1,317
Balance at January 1, net	100	97
Add: Incurred benefits	1	3
Less: Paid benefits	(3)	0
Ending balance, net	104	100
Costs payable, ending balance, gross	17	16
Add: Reinsurance and other amounts recoverable	1,165	1,186
Future Policy Benefit Reserve, ending balance, gross	$ 1,252	$ 1,270