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Financing Arrangements - Carrying Value of Long-Term Debt (Detail) - USD ($) $ in Millions | Jan. 29, 2016 | Apr. 24, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |
Total long-term debt | $ 1,490 | $ 1,487
Senior Notes |  |
Debt Instrument [Line Items] |  |
Total principal amount | 1,500 | 1,500
Less: Unamortized discount | (4) | (5)
Unamortized issuance costs | (6) | (8)
Senior Notes | Due 2017 |  |
Debt Instrument [Line Items] |  |
Total principal amount | $ 750 | $ 750
Debt Instrument, Effective Interest Rate | 2.25% | 2.25%
Senior Notes | Due 2021 |  |
Debt Instrument [Line Items] |  |
Total principal amount | $ 500 | $ 500
Debt Instrument, Effective Interest Rate | 3.54% | 3.54%
Senior Notes | Due 2022 |  |
Debt Instrument [Line Items] |  |
Total principal amount | $ 250 | $ 250
Debt Instrument, Effective Interest Rate | 3.43% | 3.43%

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