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Fair Value Measurements Level 4 Pricing Controls and Broker Inputs to Valuation (Details)
 9 Months Ended
Sep. 30, 2016
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 for OTC derivatives that utilize independent market data inputs, quoted market prices for exchange-traded and OTC-cleared derivatives, or independent broker quotations. Excluding embedded and reinsurance related derivatives, as of September 30, 2016 and December 31, 2015, 97% and 96%, respectively, of derivatives, based upon notional values, were priced by valuation models, including discounted cash flow models and option-pricing models that utilize present value techniques, or quoted market prices. The remaining derivatives were priced by broker quotations.