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Financial Instruments and Fair Value Measurements - Summary of Investments (Detail) - USD ($) $ in Millions | Jul. 31, 2015 | Apr. 24, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | $ 2,862 | $ 3,681
Gross unrealized gains | 4 | 11
Gross unrealized losses | (2) | 0
Estimated fair value | 2,864 | 3,692
Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 1,712 | 2,249
Gross unrealized gains | 3 | 9
Gross unrealized losses | (2) | 0
Estimated fair value | 1,713 | 2,258
U.S. Treasury and Government Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 838 | 1,056
Gross unrealized gains | 1 | 2
Gross unrealized losses | 0 | 0
Estimated fair value | 839 | 1,058
Foreign Government Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 44 | 38
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 44 | 38
Commercial Paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 25 | 20
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 25 | 20
Certificates of Deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 209 | 286
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 209 | 286
Mutual Funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost or amortized cost | 34 | 32
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 34 | $ 32

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