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Stockholders' Equity - Summary of Activities Related to Dividends on Common Stock (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 26, 2018 | Oct. 27, 2017 | Oct. 26, 2018 | Oct. 27, 2017
Dividends, Common Stock [Abstract] |  |  |  |
Dividends per share declared | $ 0.40 | $ 0.20 | $ 0.80 | $ 0.40
Dividend payments |  |  | $ 207 | $ 108
Additional Paid-in Capital |  |  |  |
Dividends, Common Stock [Abstract] |  |  |  |
Dividend payments |  |  | 207 | 0
Retained Earnings (Accumulated Deficit) |  |  |  |
Dividends, Common Stock [Abstract] |  |  |  |
Dividend payments |  |  | $ 0 | $ 108

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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