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Stockholders' Equity - Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2021 | Apr. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation | $ 218 | $ 103 | $ 509 | $ 321
Software and Software Development Costs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Capitalized computer software, gross |  |  | 1 | 3
Cost of revenue |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation | 16 | 15 | 47 | 44
Selling and marketing |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation | 51 | 27 | 127 | 86
Research and development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation | 82 | 36 | 187 | 111
General and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation | $ 69 | $ 25 | $ 148 | $ 80

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