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Employee Benefit Plans - Summary of Share-Based Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Jul. 31, 2021 | Jul. 25, 2020 | Jul. 27, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total share-based compensation expense | $ 1,761 | $ 1,569 | $ 1,591
Income tax benefit for share-based compensation | 387 | 452 | 542
Cost of sales |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total share-based compensation expense | 275 | 237 | 220
Research and development |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total share-based compensation expense | 694 | 592 | 540
Sales and marketing |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total share-based compensation expense | 540 | 500 | 519
General and administrative |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total share-based compensation expense | 226 | 215 | 250
Restructuring and other charges |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total share-based compensation expense | 26 | 25 | 62
Share-based compensation expense in operating expenses |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total share-based compensation expense | 1,486 | 1,332 | 1,371
Product | Cost of sales |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total share-based compensation expense | 99 | 93 | 90
Service | Cost of sales |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total share-based compensation expense | $ 176 | $ 144 | $ 130

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