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Fair Value Measurements Level 4 Pricing Controls and Broker Inputs to Valuation (Details) - USD ($)
 6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0   $ 0  
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 June 30, 2016 and December 31, 2015, 95% 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.      
US Treasury Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 67,000,000 $ 808,000,000 $ 0 $ 0