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Stockholders' Equity - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 27, 2017 | Oct. 28, 2016 | Oct. 27, 2017 | Oct. 28, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Operating expenses | $ 683 | $ 687 | $ 1,369 | $ 1,391
Net revenues | 1,422 | 1,340 | 2,747 | 2,634
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications | (1) | 0 | (1) | 0
Reclassification out of Accumulated Other Comprehensive Income | Recognized (Gains) Losses on Defined Benefit Obligations |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Operating expenses | (1) | 1 | (1) | 1
Reclassification out of Accumulated Other Comprehensive Income | Realized Gains on Cash Flow Hedges |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net revenues | $ 0 | $ (1) | $ 0 | $ (1)

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