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Derivatives Derivatives (Details 5-Non Hedges) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]                  
Derivative Instruments, Gain (Loss) [Line Items]                  
Cash Flow Hedges Derivative Instruments at Fair Value, Net   $ 0 $ 2 $ 0 $ 2 $ 46 $ 60 $ 0 $ 0
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net   0 2 (13) 2        
Cash Proceeds Received from Derivatives $ 54 54              
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax   (46) $ 0 (47) $ 0        
Unsecured Debt [Member]                  
Derivative Instruments, Gain (Loss) [Line Items]                  
Debt Instrument, Face Amount   $ 1,000   $ 1,000