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Financing Arrangements - Carrying Value of Long-Term Debt (Detail) - USD ($) $ in Millions | Apr. 27, 2018 | Apr. 28, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Total senior notes | $ 1,541 | $ 1,493
Less: Current portion of long-term debt | 0 | (749)
Total long-term debt | 1,541 | 744
Senior Notes |  |
Debt Instrument [Line Items] |  |
Total principal amount | 1,550 | 1,500
Unamortized discount and issuance costs | (9) | (7)
Senior Notes | Due December 2017 |  |
Debt Instrument [Line Items] |  |
Total principal amount | 0 | $ 750
Debt Instrument, Effective Interest Rate |  | 2.25%
Senior Notes | Due September 2019 |  |
Debt Instrument [Line Items] |  |
Total principal amount | $ 400 | $ 0
Debt Instrument, Effective Interest Rate | 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 | $ 0
Debt Instrument, Effective Interest Rate | 3.42% |

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