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Financial Instruments and Fair Value Measurements - Summary of Investments (Detail) - USD ($) $ in Millions | Apr. 26, 2019 | Apr. 27, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | $ 1,725 | $ 2,738
Gross unrealized gains | 2 | 1
Gross unrealized losses | (9) | (44)
Estimated fair value | 1,718 | 2,695
Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 1,359 | 1,865
Gross unrealized gains | 2 | 1
Gross unrealized losses | (8) | (39)
Estimated fair value | 1,353 | 1,827
U.S. Treasury and Government Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 214 | 497
Gross unrealized gains | 0 | 0
Gross unrealized losses | (1) | (5)
Estimated fair value | 213 | 492
Commercial Paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 0 | 230
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 0 | 230
Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 117 | 115
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 117 | 115
Mutual Funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 35 | 31
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 35 | $ 31

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