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Earnings Per Share - Reconciliation from Basic Earnings Per Share to Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Earnings Per Share [Abstract]      
Net income available to common stockholders $ 5,727 $ 2,539 $ 4,029
Determination of shares:      
Weighted average common shares outstanding 1,573.0 1,558.8 1,579.7
Assumed conversion of dilutive stock options and awards 36.4 32.8 38.7
DILUTED WEIGHTED AVERAGE COMMON SHARES OUTSTANDING 1,609.4 1,591.6 1,618.4
Earnings per common share:      
Basic (in dollars per share) $ 3.64 $ 1.63 $ 2.55
Diluted (in dollars per share) $ 3.56 $ 1.60 $ 2.49