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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Derivative, Gain (Loss) on Derivative, Net $ (27) $ (21)      
Credit Standing Adjustment 0   $ 0   $ 1
Credit standing adjustment assumption net of reinsurance [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Derivative, Gain (Loss) on Derivative, Net (2) 2 (2) $ 1  
Gain (Loss) Due to Changes in Assumptions [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Derivative, Gain (Loss) on Derivative, Net     0    
GMWB Derivatives, Net [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Behavior Risk Margin 69   69   $ 74
GMWB Derivatives, Net [Member] | Gain (Loss) Due to Changes in Assumptions [Member]          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Derivative, Gain (Loss) on Derivative, Net 31 75 31 75  
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 $ 1 $ 7 $ 11 $ 20