Reinsurance - Guaranteed Minimum Death Benefit Contracts, Future Policy Benefits (Details) - Variable Annuity [Member] - Guaranteed Minimum Death Benefit [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Activity in future policy benefits reserves for GMDB business [Line Items]
Future Policy Benefit Reserve, beginning balance, gross	$ 1,270	$ 1,396	$ 1,090
Costs payable, beginning balance, gross	16	18	24
Less: Reinsurance and other amounts recoverable	1,186	1,317	42
Balance at January 1, net	100	97	1,072
Add: Incurred benefits	3	3	699
Less: Paid benefits	(3)	0	1,674
Ending balance, net	106	100	97
Costs payable, ending balance, gross	18	16	18
Add: Reinsurance and other amounts recoverable	1,164	1,186	1,317
Future Policy Benefit Reserve, ending balance, gross	$ 1,252	$ 1,270	$ 1,396