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Objectives And Strategies For Using Derivatives (Narratives) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Derivative Instruments, Gain (Loss)        
Fair value hedge ineffectiveness assertion     Fair value hedges resulted in no significant ineffectiveness in the six months ended June 30, 2016 and 2015  
Gain (loss) recognized in earnings as a result of hedge not qualifying as a fair value hedge     $ 0 $ 0
Cash flow hedge ineffectiveness assertion     Cash flow hedges resulted in no significant ineffectiveness for the six months ended June 30, 2016 and 2015  
Gain (loss) reclassified into earnings as a result of discontinuance of cash flow hedges     $ 0 0
Not Designated as Hedging Instrument        
Derivative Instruments, Gain (Loss)        
Aggregate notional values of outstanding derivatives $ 2,000,000,000   2,000,000,000  
Gain (loss) on undesignated foreign exchange hedging instruments (14,000,000) $ 74,000,000 14,000,000 $ (81,000,000)
Net Investment Hedging        
Derivative Instruments, Gain (Loss)        
Aggregate notional values of outstanding derivatives 89,000,000   89,000,000  
Fair Value Hedging | Interest Rate Swap        
Derivative Instruments, Gain (Loss)        
Aggregate notional values of outstanding derivatives 375,000,000   $ 375,000,000  
Cash Flow Hedging        
Derivative Instruments, Gain (Loss)        
Derivative, Maturity Date     Dec. 01, 2018  
Cash Flow Hedging | Foreign currency exchange contracts        
Derivative Instruments, Gain (Loss)        
Aggregate notional values of outstanding derivatives 795,000,000   $ 795,000,000  
Cash Flow Hedging | Interest Rate Swap        
Derivative Instruments, Gain (Loss)        
Aggregate notional values of outstanding derivatives $ 0   $ 0