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Derivatives (Tables)
3 Months Ended
Jun. 30, 2011
Derivatives [Abstract]  
Effect of interest rate and foreign exchange derivatives on Consolidated Statement of Operations
                 
    Amount of Net (Gain)/Loss Recognized in the  
    Condensed Consolidated Statements of Operations  
    (in millions)  
    Three Months Ended     Three Months Ended  
Location of Amounts Recognized   June 30, 2011     June 30, 2010  
Interest expense, net — interest rate swaps designated as cash flow hedges
  $     $ 2  
Interest expense, net — interest rate swaps designated as fair value hedges
  $ (3 )   $ (3 )
Other expenses (gains), net — foreign currency contracts
  $ 7     $ (13 )