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Stockholders' Equity - Summary of Activities Related to Dividends on Common Stock (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Apr. 30, 2021 | Apr. 24, 2020 | Apr. 26, 2019
Dividends, Common Stock [Abstract] |  |  |
Dividends per share declared | $ 1.92 | $ 1.92 | $ 1.60
Dividend payments | $ 427 | $ 439 | $ 403
Additional Paid-in Capital |  |  |
Dividends, Common Stock [Abstract] |  |  |
Dividend payments | 30 | 400 | 403
Retained Earnings |  |  |
Dividends, Common Stock [Abstract] |  |  |
Dividend payments | $ 397 | $ 39 | $ 0

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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=120397183&loc=d3e187085-122770 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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