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Financial Instruments and Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Oct. 25, 2019 | Apr. 26, 2019
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Instrument, Fair Value Disclosure | $ 1,174 | $ 1,553
Corporate Bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Proceeds from sale of available-for-sale investments | 1,000 |
Corporate Bonds | Other Income, Net |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Realized gain on sale of available-for-sale investments | $ 14 |

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