Fair Value Measurements Level 4 Pricing Controls and Broker Inputs to Valuation (Details)	9 Months Ended
	Sep. 30, 2015
Derivative Financial Instruments, Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Techniques	Derivative instruments are fair valued using pricing valuation models that utilize independent market data inputs for OTC derivatives, quoted market prices for exchange-traded and OTC-cleared derivatives, or independent broker quotations. Excluding embedded and reinsurance related derivatives, as of September 30, 2015 and December 31, 2014, 96% and 96%, respectively, of derivatives, based upon notional values, were priced by valuation models or quoted market prices. The remaining derivatives were priced by broker quotations.