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Restructuring (Tables)
3 Months Ended
Jun. 30, 2011
Restructuring [Abstract]  
Restructuring activity
                 
            Facilities  
Fiscal 2010 Plan   Severance     Abandonment  
    (in millions)  
Accrued balance at March 31, 2010
  $ 46     $ 2  
Activity for the period ended June 30, 2010
               
Change in estimate
    (3 )      
Payments
    (22 )      
Accretion and other
    (1 )      
 
           
Accrued balance at June 30, 2010
  $ 20     $ 2  
 
           
 
               
Accrued balance at March 31, 2011
  $ 4     $ 1  
Activity for the period ended June 30, 2011
               
Change in estimate
    (1 )      
Payments
    (1 )      
 
           
Accrued balance at June 30, 2011
  $ 2     $ 1  
 
           
                 
            Facilities  
Fiscal 2007 Plan   Severance     Abandonment  
    (in millions)  
Accrued balance at March 31, 2010
  $ 8     $ 60  
Payments
    (2 )     (4 )
 
           
Accrued balance at June 30, 2010
  $ 6     $ 56  
 
           
 
               
Accrued balance at March 31, 2011
    4       46  
Change in estimate
          1  
Payments
    (1 )     (4 )
Accretion and other
          1  
 
           
Accrued balance at June 30, 2011
  $ 3     $ 44