Stockholders' Equity - Summary of Activities Related to Stock Repurchase Program (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended	192 Months Ended
Apr. 26, 2019	Apr. 27, 2018	Apr. 28, 2017	Apr. 26, 2019
Equity [Abstract]
Number of shares repurchased	29	15	22	313
Average price per share	$ 72.87	$ 51.57	$ 32.72	$ 37.46
Aggregate purchase price	$ 2,111	$ 794	$ 705
Remaining authorization at end of period	$ 1,889	$ 4,000	$ 794	$ 1,889

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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration