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Shareholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Feb. 12, 2020	Jan. 25, 2020	Jan. 26, 2019	Jan. 25, 2020	Jan. 26, 2019	Jul. 27, 2019
Class of Stock [Line Items]
Cash dividends paid per common share (in dollars per share)		$ 0.35	$ 0.33	$ 0.70	$ 0.66
Payments of dividends		$ 1,500		$ 2,972	$ 2,970
Cash dividends declared (in dollars per share)		$ 0.35	$ 0.33	$ 0.70	$ 0.66
Remaining authorized repurchase amount		$ 11,800		$ 11,800
Subsequent event
Class of Stock [Line Items]
Cash dividends declared (in dollars per share)	$ 0.36
Stock repurchase program
Class of Stock [Line Items]
Stock repurchases pending settlement		$ 30		$ 30		$ 40