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Employee Benefit Plans - Summary of Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended
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Oct. 24, 2020 | Oct. 26, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total share-based compensation expense | $ 438 | $ 398
Income tax benefit for share-based compensation | 81 | 131
Share-based compensation expense in cost of sales |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total share-based compensation expense | 65 | 57
Research and development |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total share-based compensation expense | 167 | 146
Sales and marketing |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total share-based compensation expense | 134 | 127
General and administrative |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total share-based compensation expense | 61 | 60
Restructuring and other charges |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total share-based compensation expense | 11 | 8
Share-based compensation expense in operating expenses |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total share-based compensation expense | 373 | 341
Product | Share-based compensation expense in cost of sales |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total share-based compensation expense | 24 | 23
Services | Share-based compensation expense in cost of sales |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total share-based compensation expense | $ 41 | $ 34

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