Stockholders' Equity - Summary of Activities Related to Stock Repurchase Program (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	6 Months Ended	198 Months Ended
Oct. 25, 2019	Oct. 26, 2018	Oct. 25, 2019	Oct. 26, 2018	Oct. 25, 2019
Equity [Abstract]
Number of shares repurchased			14		327
Average price per share			$ 55.06		$ 38.20
Aggregate purchase price	$ 500	$ 561	$ 750	$ 1,061
Remaining authorization at end of period	$ 1,139		$ 1,139		$ 1,139

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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