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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 8 Months Ended |
--- | --- | --- | ---
Jul. 26, 2019 | Jul. 27, 2018 | Dec. 31, 2017 | Apr. 26, 2019
Income Tax Contingency [Line Items] |  |  |  |
U.S. federal corporate tax rate | 21.00% |  | 35.00% |
Provision (benefit) for income taxes | $ 16 | $ (11) |  |
Gross unrecognized tax benefits | 293 |  |  |
Gross unrecognized tax benefits included in other long-term liabilities | 249 |  |  | $ 252
Unrecognized tax benefits that would affect provision for income taxes | $ 244 |  |  |
Impact of ASC 606 Adoption | ASC 606 |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Provision (benefit) for income taxes |  | $ (34) |  |

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