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Earnings Per Share (Tables)
12 Months Ended
Mar. 31, 2020
Earnings Per Share Reconciliation [Abstract]  
Computation Of Basic Earnings And Diluted Earnings Per Share
 Year Ended March 31,
(In millions, except per share amounts)202020192018
Net income$3,039  $1,019  $1,043  
Shares used to compute earnings per share:
Weighted-average common stock outstanding — basic293  303  308  
Dilutive potential common shares related to stock award plans and from assumed exercise of stock options   
Weighted-average common stock outstanding — diluted295  306  312  
Earnings per share:
Basic$10.37  $3.36  $3.39  
Diluted$10.30  $3.33  $3.34