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Financial Instruments and Fair Value Measurements - Summary of Investments (Detail) - USD ($) $ in Millions | Jul. 27, 2018 | Apr. 27, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | $ 2,369 | $ 2,738
Gross unrealized gains | 1 | 1
Gross unrealized losses | (44) | (44)
Estimated fair value | 2,326 | 2,695
Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 1,740 | 1,865
Gross unrealized gains | 1 | 1
Gross unrealized losses | (39) | (39)
Estimated fair value | 1,702 | 1,827
U.S. Treasury and Government Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 441 | 497
Gross unrealized gains | 0 | 0
Gross unrealized losses | (5) | (5)
Estimated fair value | 436 | 492
Commercial Paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 38 | 230
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 38 | 230
Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 116 | 115
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 116 | 115
Mutual Funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 34 | 31
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 34 | $ 31

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