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Objectives And Strategies For Using Derivatives (Narratives) (Details)
€ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
EUR (€)
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Derivative Instruments, Gain (Loss)              
Debt Instrument, Face Amount | €         € 500    
Not Designated as Hedging Instrument              
Derivative Instruments, Gain (Loss)              
Aggregate notional values of outstanding derivatives           $ 2,000,000,000  
Gain (loss) on undesignated foreign exchange hedging instruments $ 22,000,000 $ 5,000,000 $ 38,000,000 $ 19,000,000      
Net Investment Hedging              
Derivative Instruments, Gain (Loss)              
Aggregate notional values of outstanding derivatives         € 500 55,000,000  
Cash Flow Hedging              
Derivative Instruments, Gain (Loss)              
Cash flow hedge ineffectiveness assertion     Cash flow hedges resulted in no significant ineffectiveness for the nine months ended September 30, 2017 and 2016        
Gain (loss) reclassified into earnings as a result of discontinuance of cash flow hedges     $ 0 0      
Derivative, Maturity Date     Oct. 21, 2019        
Cash Flow Hedging | Foreign currency exchange contracts              
Derivative Instruments, Gain (Loss)              
Aggregate notional values of outstanding derivatives           765,000,000  
Cash Flow Hedging | Interest Rate Contract              
Derivative Instruments, Gain (Loss)              
Aggregate notional values of outstanding derivatives           200,000,000  
Fair Value Hedging              
Derivative Instruments, Gain (Loss)              
Fair value hedge ineffectiveness assertion     Fair value hedges resulted in no significant ineffectiveness in the nine months ended September 30, 2017 and 2016        
Gain (loss) recognized in earnings as a result of hedge not qualifying as a fair value hedge     $ 0 $ 0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2              
Derivative Instruments, Gain (Loss)              
Derivative Liability           69,000,000 $ 46,000,000
Derivative Asset           $ 50,000,000 $ 43,000,000