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Earnings Per Common Share (Tables)
 3 Months Ended
Jun. 30, 2011
Earnings Per Common Share [Abstract]  
Basic and diluted earnings per common share
                 
    Quarter Ended
June 30,
(In millions, except per share amounts)   2011   2010
 
 
               
Net income
  $ 286     $ 298  
       
 
               
Weighted average common shares outstanding:
               
Basic
    249       266  
Effect of dilutive securities:
               
Options to purchase common stock
    2       4  
Restricted stock units
    3       2  
       
Diluted
    254       272  
       
 
               
Earnings per common share: (1)
               
Diluted
  $ 1.13     $ 1.10  
       
Basic
  $ 1.15     $ 1.12  
 
(1)   Certain computations may reflect rounding adjustments.