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Financial Instruments and Fair Value Measurements - Summary of Investments (Detail) - USD ($) $ in Millions | Jan. 29, 2021 | Apr. 24, 2020
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | $ 183 | $ 414
Gross unrealized gains | 1 | 1
Gross unrealized losses | 0 | 0
Estimated fair value | 184 | 415
Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 68 | 155
Gross unrealized gains | 1 | 1
Gross unrealized losses | 0 | 0
Estimated fair value | 69 | 156
U.S. Treasury and Government Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 17 | 68
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 17 | 68
Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 59 | 158
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 59 | 158
Mutual Funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 39 | 33
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 39 | $ 33

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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