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Financial Instruments and Fair Value Measurements - Summary of Investments (Detail) - USD ($) $ in Millions | Oct. 28, 2016 | Apr. 29, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | $ 2,510 | $ 2,613
Gross unrealized gains | 5 | 7
Gross unrealized losses | (2) | (1)
Estimated fair value | 2,513 | 2,619
Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 1,234 | 1,370
Gross unrealized gains | 4 | 5
Gross unrealized losses | (1) | (1)
Estimated fair value | 1,237 | 1,374
U.S. Treasury and Government Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 669 | 878
Gross unrealized gains | 1 | 2
Gross unrealized losses | (1) | 0
Estimated fair value | 669 | 880
Foreign Government Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 27 | 35
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 27 | 35
Commercial Paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 476 | 202
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 476 | 202
Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 72 | 98
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 72 | 98
Mutual Funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 32 | 30
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 32 | $ 30

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