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Earnings Per Share
 9 Months Ended
Feb. 28, 2021
Earnings Per Share [Abstract]  
Earnings Per Share
NOTE 8 — EARNINGS PER SHARE
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 restricted stock and options, including shares under ESPPs, to purchase an additional 15.8 million shares of common stock outstanding for the three months ended February 29, 2020 because the awards were anti-dilutive. The amount of anti-dilutive awards for the three months ended February 28, 2021 was insignificant. For the nine months ended February 28, 2021 and February 29, 2020 the computations of diluted earnings per common share excluded 11.6 million and 31.1 million shares of common stock outstanding because the awards were anti-dilutive.
 THREE MONTHS ENDED NINE MONTHS ENDED
(In millions, except per share data)
FEBRUARY 28, 2021FEBRUARY 29, 2020FEBRUARY 28, 2021FEBRUARY 29, 2020
Net income available to common stockholders$1,449 $847 $4,218 $3,329 
Determination of shares:
Weighted average common shares outstanding1,578.0 1,556.3 1,570.9 1,559.8 
Assumed conversion of dilutive stock options and awards38.9 35.3 36.4 34.8 
DILUTED WEIGHTED AVERAGE COMMON SHARES OUTSTANDING1,616.9 1,591.6 1,607.3 1,594.6 
Earnings per common share:
Basic$0.92 $0.54 $2.68 $2.13 
Diluted$0.90 $0.53 $2.62 $2.09