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Derivative Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 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 12   12    
Net liability position of derivatives that contain certain credit risk-related contingent features    
Gain (Loss) Recognized in Income Statement  
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Currency Swaps [Member]          
Derivative [Line Items]          
Notional Amount 31   $ 31   55
Maximum term length, foreign currency derivatives     4 years    
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 181   $ 181   78
Maximum term length, foreign currency derivatives     12 years    
Non designated [Member] | Forward Contracts [Member]          
Derivative [Line Items]          
Notional Amount $ 205   $ 205   $ 149
Maximum term length, foreign currency derivatives     3 months