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Stockholders' Equity - Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Oct. 31, 2021 | Oct. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation | $ 280 | $ 111
Software and Software Development Costs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Capitalized computer software, gross | 1 | 1
Cost of revenue |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation | 27 | 15
Selling and marketing |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation | 64 | 32
Research and development |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation | 109 | 38
General and administrative |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation | $ 80 | $ 26

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