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Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]      
Trading Securities, Debt $ 55   $ 57
Trading Securities, Equity 63   63
Trading Securities 118   $ 120
Trading Securities, Recognized Gain 5 $ 0  
Trading Securities, Recognized Loss (4) 0  
Trading Securities, Recognized Gain (Loss) $ 1 $ 0