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Divestitures (Tables)
6 Months Ended
Sep. 30, 2011
Divestitures [Abstract] 
Income (loss) from discontinued components
         
    Six Months Ended  
    September 30, 2011  
    (in millions)  
Subscription and maintenance revenue
  $ 15  
 
     
Total revenue
  $ 15  
 
     
 
       
Loss from operations of discontinued components, net of tax benefit of $6 million
  $ (10 )
Gain on disposal of discontinued components, net of taxes
    23  
 
     
Income from discontinued operations, net of taxes
  $ 13  
 
     
                 
    Three Months Ended     Six Months Ended  
    September 30, 2010     September 30, 2010  
    (in millions)  
Subscription and maintenance revenue
  $ 22     $ 46  
Professional services
          1  
 
           
Total revenue
  $ 22     $ 47  
 
           
 
               
Income from operations of discontinued components, net of tax expense of $2 million and $3 million, respectively
  $ 3     $ 4  
Gain (loss) on disposal of discontinued components, net of taxes
          (5 )
 
           
Income (loss) from discontinued operations, net of taxes
  $ 3     $ (1 )