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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions, shares in Billions		3 Months Ended		6 Months Ended
	Feb. 16, 2022	Jan. 29, 2022	Jan. 23, 2021	Jan. 29, 2022	Jan. 23, 2021	Jul. 31, 2021
Class of Stock [Line Items]
Cash dividends paid per common share (in dollars per share)		$ 0.37	$ 0.36	$ 0.74	$ 0.72
Payments of dividends		$ 1,500	$ 1,500	$ 3,102	$ 3,041
Cash dividends declared (in dollars per share)		$ 0.37	$ 0.36	$ 0.74	$ 0.72
Subsequent event
Class of Stock [Line Items]
Cash dividends declared (in dollars per share)	$ 0.38
Number of shares authorized to be repurchased	15
Remaining authorized repurchase amount	$ 18,000
Stock repurchase program
Class of Stock [Line Items]
Stock repurchases pending settlement						$ 25