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Derivatives (Tables)
6 Months Ended
Sep. 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   September 30, 2011     September 30, 2010  
 
Interest expense, net — interest rate swaps designated as cash flow hedges
  $     $ 1  
Interest expense, net — interest rate swaps designated as fair value hedges
  $ (3 )   $ (3 )
Other (gains) expenses, net — foreign currency contracts
  $ (6 )   $ 21  
                 
    Amount of Net (Gain)/Loss Recognized in the  
    Condensed Consolidated Statements of Operations  
    (in millions)  
    Six Months Ended     Six Months Ended  
Location of Amounts Recognized   September 30, 2011     September 30, 2010  
 
Interest expense, net — interest rate swaps designated as cash flows hedges
  $     $ 3  
Interest expense, net — interest rate swaps designated as fair value hedges
  $ (6 )   $ (6 )
Other (gains) expenses, net — foreign currency contracts
  $ 1     $ 8