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Shareholders' Equity - Additional Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Jul. 25, 2020	Apr. 25, 2020	Jan. 25, 2020	Oct. 26, 2019	Jul. 27, 2019	Apr. 27, 2019	Jan. 26, 2019	Oct. 27, 2018	Jul. 25, 2020	Jul. 27, 2019	Jul. 28, 2018
Stockholders' Equity Note [Abstract]
Cash dividends paid per common share (in dollars per share)	$ 0.36	$ 0.36	$ 0.35	$ 0.35	$ 0.35	$ 0.35	$ 0.33	$ 0.33	$ 1.42	$ 1.36	$ 1.24
Payment of dividends									$ 6,016,000,000	$ 5,979,000,000	$ 5,968,000,000
Remaining authorized repurchase amount	$ 10,800,000,000								10,800,000,000
Stock repurchase program
Class of Stock [Line Items]
Stock repurchases pending settlement	$ 0				$ 40,000,000				$ 0	$ 40,000,000	$ 180,000,000