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Financial Instruments and Fair Value Measurements - Summary of Investments (Detail) - USD ($) $ in Millions | Oct. 27, 2017 | Apr. 28, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | $ 2,887 | $ 2,677
Gross unrealized gains | 6 | 4
Gross unrealized losses | (5) | (4)
Estimated fair value | 2,888 | 2,677
Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 1,747 | 1,535
Gross unrealized gains | 6 | 3
Gross unrealized losses | (3) | (2)
Estimated fair value | 1,750 | 1,536
U.S. Treasury and Government Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 474 | 629
Gross unrealized gains | 0 | 1
Gross unrealized losses | (2) | (2)
Estimated fair value | 472 | 628
Foreign Government Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 21 | 21
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 21 | 21
Commercial Paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 504 | 362
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 504 | 362
Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 107 | 99
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 107 | 99
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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