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Stockholders' Equity - Stock-Based Compensation Expense (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 24, 2020 | Jan. 25, 2019 | Jan. 24, 2020 | Jan. 25, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 36 | $ 43 | $ 118 | $ 121
Income tax benefit for stock-based compensation expense | 3 | 1 | 11 | 11
Cost of Product Revenues |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 1 | 1 | 3 | 2
Cost of Hardware Maintenance and Other Services Revenues |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 2 | 3 | 7 | 8
Sales and Marketing |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 15 | 19 | 50 | 52
Research and Development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 13 | 13 | 41 | 37
General and Administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 5 | $ 7 | $ 17 | $ 22

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