Reinsurance - Future Policy Benefits for GMDB Business (Details) - Variable Annuity [Member] - Guaranteed Minimum Death Benefit [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Activity in future policy benefits reserves for GMDB business [Line Items]
Future Policy Benefit Reserve, beginning balance, gross	$ 1,252	$ 1,270	$ 1,396
Balance at January 1,	18	16	18
Less: Reinsurance and other amounts recoverable	1,164	1,186	1,317
Balance at January 1, net	106	100	97
Add: Incurred benefits	4	3	3
Less: Paid benefits / (recoveries)	(1)	(3)	0
Ending balance, net	111	106	100
Balance at December 31,	16	18	16
Add: Reinsurance and other amounts recoverable	1,129	1,164	1,186
Future Policy Benefit Reserve, ending balance, gross	$ 1,224	$ 1,252	$ 1,270