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Basis Of Presentation Derivative Instruments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
July 2012      
Derivative [Line Items]      
Notional amount of derivative instrument $ 225    
January 2013      
Derivative [Line Items]      
Notional amount of derivative instrument 200    
August 2015      
Derivative [Line Items]      
Notional amount of derivative instrument 600    
November 2017      
Derivative [Line Items]      
Notional amount of derivative instrument 450    
Foreign Exchange Contract      
Derivative [Line Items]      
Notional amount of derivative instrument 20   $ 33
Foreign Exchange Contract | Maximum      
Derivative [Line Items]      
Fair value of derivative instrument 1   1
Foreign Exchange Contract | Not Designated as Hedging Instrument [Member] | Operating Expense [Member]      
Derivative [Line Items]      
(Gain) or Loss Recognized on Derivatives 0 $ (1)  
Interest Rate Swap      
Derivative [Line Items]      
Notional amount of derivative instrument 1,475    
Interest Rate Swap | Not Designated as Hedging Instrument [Member] | Interest Expense [Member]      
Derivative [Line Items]      
(Gain) or Loss Recognized on Derivatives 31 $ 14  
Interest Rate Swap | Not Designated as Hedging Instrument [Member] | Other Non-Current Liabilities [Member]      
Derivative [Line Items]      
Fair value of interest rate swap contracts $ 73   $ 47