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Financing Arrangements - Carrying Value of Long-Term Debt (Detail) - USD ($) $ in Millions | Oct. 26, 2018 | Apr. 27, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Total senior notes | $ 1,543 | $ 1,541
Less: Current portion of long-term debt | (399) | 0
Total long-term debt | 1,144 | 1,541
Senior Notes |  |
Debt Instrument [Line Items] |  |
Total principal amount | 1,550 | 1,550
Unamortized discount and issuance costs | (7) | (9)
Senior Notes | Due September 2019 |  |
Debt Instrument [Line Items] |  |
Total principal amount | $ 400 | $ 400
Debt Instrument, Effective Interest Rate | 2.32% | 2.32%
Senior Notes | Due June 2021 |  |
Debt Instrument [Line Items] |  |
Total principal amount | $ 500 | $ 500
Debt Instrument, Effective Interest Rate | 3.54% | 3.54%
Senior Notes | Due December 2022 |  |
Debt Instrument [Line Items] |  |
Total principal amount | $ 250 | $ 250
Debt Instrument, Effective Interest Rate | 3.43% | 3.43%
Senior Notes | Due September 2024 |  |
Debt Instrument [Line Items] |  |
Total principal amount | $ 400 | $ 400
Debt Instrument, Effective Interest Rate | 3.42% | 3.42%

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