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Common Stock and Stock-Based Compensation - Total Stock-Based Compensation Expense (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2021 | May 31, 2020 | May 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Accelerated stock option expense | $ 67 | $ 53 | $ 41
Tax benefit related to stock-based compensation expense | 297 | 207 | 175
Class B Common Stock |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense | 611 | 429 | 325
Class B Common Stock | Stock options |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense | 323 | 237 | 207
Class B Common Stock | ESPPs |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense | 63 | 53 | 40
Class B Common Stock | Restricted stock(1) |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense | $ 225 | $ 139 | $ 78

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