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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

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