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Stockholders' Equity - Reconciliation of Retained Earnings (Accumulated Deficit) (Detail) - USD ($) $ in Millions | 3 Months Ended | 183 Months Ended
--- | --- | ---
Jul. 27, 2018 | Jul. 28, 2017 | Jul. 27, 2018
Retained Earnings Adjustments [Line Items] |  |  |
Beginning balance | $ (9) |  |
Net income | 283 | $ 131 |
Repurchases of common stock | (500) |  | $ (10,100)
Ending balance | 0 |  | 0
Retained Earnings (Accumulated Deficit) |  |  |
Retained Earnings Adjustments [Line Items] |  |  |
Cumulative-effect of new accounting principle | (51) |  | $ (51)
Net income | 283 |  |
Repurchases of common stock | $ (223) |  |

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