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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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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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