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Financial Instruments and Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions | Apr. 28, 2017 | Apr. 29, 2016
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | $ 4,921 | $ 5,303
Other Current Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign currency exchange contracts assets | [1] | 1 | 3
Accrued Expenses |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign currency exchange contracts liabilities | [2] | (4) | (8)
Corporate Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 1,536 | 1,374
U.S. Treasury and Government Debt Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 628 | 880
Foreign Government Debt Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 21 | 35
Commercial Paper |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 362 | 202
Certificates of Deposit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 99 | 98
Mutual Funds | Other Current Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | [1] | 7 | 5
Mutual Funds | Other Noncurrent Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | [3] | 24 | 25
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 2,548 | 2,990
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Current Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign currency exchange contracts assets | [1] | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Accrued Expenses |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign currency exchange contracts liabilities | [2] | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury and Government Debt Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 273 | 276
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign Government Debt Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial Paper |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of Deposit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual Funds | Other Current Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | [1] | 7 | 5
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual Funds | Other Noncurrent Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | [3] | 24 | 25
Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 2,373 | 2,313
Significant Other Observable Inputs (Level 2) | Other Current Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign currency exchange contracts assets | [1] | 1 | 3
Significant Other Observable Inputs (Level 2) | Accrued Expenses |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign currency exchange contracts liabilities | [2] | (4) | (8)
Significant Other Observable Inputs (Level 2) | Corporate Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 1,536 | 1,374
Significant Other Observable Inputs (Level 2) | U.S. Treasury and Government Debt Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 355 | 604
Significant Other Observable Inputs (Level 2) | Foreign Government Debt Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 21 | 35
Significant Other Observable Inputs (Level 2) | Commercial Paper |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 362 | 202
Significant Other Observable Inputs (Level 2) | Certificates of Deposit |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 99 | 98
Significant Other Observable Inputs (Level 2) | Mutual Funds | Other Current Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | [1] | 0 | 0
Significant Other Observable Inputs (Level 2) | Mutual Funds | Other Noncurrent Assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets | [3] | 0 | 0
Cash |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 2,275 | 2,714
Cash | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | 2,275 | 2,714
Cash | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | $ 0 | $ 0
[1] | Reported as other current assets in the consolidated balance sheets
[2] | Reported as accrued expenses in the consolidated balance sheets
[3] | Reported as other non-current assets in the consolidated balance sheets

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