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Derivative Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Derivative [Line Items]          
Fair Value    
Gain (Loss) Recognized in Other Comprehensive Income  
Gains (losses) reclassified from other comprehensive income into income  
Amounts excluded from assessment of hedge effectiveness  
Gains (losses) recognized due to hedge ineffectiveness  
Cash on deposit representing upfront margin required by clearinghouse 10   10    
Net liability position of derivatives that contain certain credit risk-related contingent features    
Gain (Loss) Recognized in Income Statement  
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Interest Rate Swaps [Member]          
Derivative [Line Items]          
Notional Amount 750   750   750
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] | Foreign Currency Swaps [Member]          
Derivative [Line Items]          
Notional Amount 250   250   78
Non designated [Member] | Forward Contracts [Member]          
Derivative [Line Items]          
Notional Amount $ 255   $ 255   $ 149