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Stockholders' Equity - Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation | $ 180 | $ 107 | $ 291 | $ 218
Software and Software Development Costs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Capitalized computer software, gross |  |  | 1 | 2
Cost of revenue |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation | 16 | 14 | 31 | 29
Selling and marketing |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation | 44 | 29 | 76 | 59
Research and development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation | 67 | 37 | 105 | 75
General and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation | $ 53 | $ 27 | $ 79 | $ 55

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