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Earnings Per Share (Tables)
3 Months Ended
Aug. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following is a reconciliation from basic earnings per common share to diluted earnings per common share. The computations of diluted earnings per common share excluded options, including shares under ESPPs, and restricted stock to purchase an additional 2.1 million and 19.1 million shares of common stock outstanding for the three months ended August 31, 2020 and 2019, respectively, because the options were anti-dilutive.
 THREE MONTHS ENDED AUGUST 31,
(In millions, except per share data)
20202019
Net income available to common stockholders$1,518 $1,367 
Determination of shares:
Weighted average common shares outstanding1,561.8 1,562.4 
Assumed conversion of dilutive stock options and awards31.5 35.1 
DILUTED WEIGHTED AVERAGE COMMON SHARES OUTSTANDING1,593.3 1,597.5 
Earnings per common share:
Basic$0.97 $0.87 
Diluted$0.95 $0.86