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Stock-Based Compensation - Total Stock-Based Compensation Expense (Detail) - USD ($) $ in Millions | 3 Months Ended
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Aug. 31, 2020 | Aug. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based compensation expense | $ 136 | $ 80
Tax benefit related to stock-based compensation expense | 81 | 37
Class B Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based compensation expense | $ 136 | 80
Stock Incentive Plan | Class B Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for grant (in shares) | 798,000,000 |
Stock options | Class B Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based compensation expense | $ 70 | 42
ESPPs | Class B Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based compensation expense | 18 | 13
Restricted stock | Class B Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock-based compensation expense | $ 48 | $ 25

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