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Fair Value Measurements Level 4 Credit Standing Adjustments and Behavior Risk Margins (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Derivative, Gain (Loss) on Derivative, Net $ (17) $ (27) $ (48) $ (30)  
Credit Standing Adjustment (1)   (1)   $ 0
Credit standing adjustment assumption net of reinsurance [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Derivative, Gain (Loss) on Derivative, Net (3) (2) (1) (2)  
Gain (Loss) Due to Changes in Assumptions [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Derivative, Gain (Loss) on Derivative, Net 0 0   0  
GMWB Derivatives, Net [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Behavior Risk Margin 43   43   $ 45
GMWB Derivatives, Net [Member] | Behavior Risk Margin Update Due to Underlying Fund Performance [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Derivative, Gain (Loss) on Derivative, Net $ 17 $ 1 $ 13 $ 11