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Basis Of Presentation Derivative Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Foreign Exchange Contract          
Derivative [Line Items]          
Notional amount of derivative instrument $ 22   $ 22   $ 33
Foreign Exchange Contract | Not Designated as Hedging Instrument [Member] | Operating Expense [Member]          
Derivative [Line Items]          
(Gain) or Loss Recognized on Derivatives 0 $ 0 0 $ (1)  
Foreign Exchange Contract | Maximum          
Derivative [Line Items]          
Fair value of derivative instrument 1   1   1
Interest Rate Swap          
Derivative [Line Items]          
Notional amount of derivative instrument 1,475   1,475    
Interest Rate Swap | Not Designated as Hedging Instrument [Member] | Interest Expense [Member]          
Derivative [Line Items]          
(Gain) or Loss Recognized on Derivatives 14 $ (3) 45 $ 11  
Interest Rate Swap | Not Designated as Hedging Instrument [Member] | Other Non-Current Liabilities [Member]          
Derivative [Line Items]          
Fair value of interest rate swap contracts 82   82   $ 47
Interest Rate Swap | July 2012          
Derivative [Line Items]          
Notional amount of derivative instrument 225   225    
Interest Rate Swap | January 2013          
Derivative [Line Items]          
Notional amount of derivative instrument 200   200    
Interest Rate Swap | August 2015          
Derivative [Line Items]          
Notional amount of derivative instrument 600   600    
Interest Rate Swap | November 2017          
Derivative [Line Items]          
Notional amount of derivative instrument $ 450   $ 450