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Financial Instruments and Fair Value Measurements - Summary of Investments (Detail) - USD ($) $ in Millions | Oct. 25, 2019 | Apr. 26, 2019
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Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | $ 631 | $ 1,725
Gross unrealized gains | 1 | 2
Gross unrealized losses | 0 | (9)
Estimated fair value | 632 | 1,718
Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 319 | 1,359
Gross unrealized gains | 1 | 2
Gross unrealized losses | 0 | (8)
Estimated fair value | 320 | 1,353
U.S. Treasury and Government Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 122 | 214
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | (1)
Estimated fair value | 122 | 213
Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 150 | 117
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 150 | 117
Mutual Funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 40 | 35
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 40 | $ 35

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