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Stockholders' Equity - Stock-Based Compensation Expense (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 25, 2019 | Oct. 26, 2018 | Oct. 25, 2019 | Oct. 26, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 40 | $ 38 | $ 82 | $ 78
Income tax benefit for stock-based compensation expense | 4 | 5 | 8 | 10
Cost of Product Revenues |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 1 | 0 | 2 | 1
Cost of Hardware Maintenance and Other Services Revenues |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 3 | 2 | 5 | 5
Sales and Marketing |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 17 | 16 | 35 | 33
Research and Development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 13 | 12 | 28 | 24
General and Administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 6 | $ 8 | $ 12 | $ 15

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