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Derivatives and Hedging Instruments - Gain (Loss) on Derivatives Not Designated as Hedging Instruments (Details) (Other (Expense) Income, Net [Member], Foreign Exchange Derivative [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Other (Expense) Income, Net [Member] | Foreign Exchange Derivative [Member]
       
Derivative [Line Items]        
Amount of Gain (Loss) Recognized in the Condensed Consolidated Statement of Operations $ (3) $ (4) $ (6) $ (7)