Reinsurance - Guaranteed Minimum Death Benefit Contracts, Future Policy Benefits (Details) (Variable Annuity [Member], Guaranteed Minimum Death Benefit [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Variable Annuity [Member] | Guaranteed Minimum Death Benefit [Member]
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	0	3
Less: Paid benefits	0	0
Ending balance, net	100	100
Costs payable, ending balance, gross	19	16
Add: Reinsurance and other amounts recoverable	1,163	1,186
Future Policy Benefit Reserve, ending balance, gross	$ 1,244	$ 1,270