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Stockholders' Equity - Summary of Activities Related to Stock Repurchase Program (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | 213 Months Ended
--- | --- | --- | ---
Jan. 29, 2021 | Jan. 24, 2020 | Jan. 29, 2021 | Jan. 24, 2020 | Jan. 29, 2021
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Number of shares repurchased |  |  | 1 |  | 339
Average price per share |  |  | $ 64.78 |  | $ 38.92
Stock repurchases allocated | $ 50 | $ 500 | $ 50 | $ 1,250 |
Remaining authorization at end of period | 427 |  | 427 |  | $ 427
Additional Paid-in Capital |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchases allocated |  |  | 1 |  |
Retained Earnings |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchases allocated | $ 49 | $ 277 | $ 49 | $ 629 |

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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