Reinsurance Reinsurance (Net Amount at Risk and 100 Percent Mortality) (Details)	Dec. 31, 2014
GMDB
Guaranteed Minimum Benefits [Line Items]
Discount rate - lower range	2.50%
Discount rate - upper range	3.50%
GMDB and GLB
Guaranteed Minimum Benefits [Line Items]
Discount rate - lower range	3.50%
Discount rate - upper range	4.50%