Net Income per Share - Calculation of Basic and Diluted Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jan. 28, 2023	Jan. 29, 2022	Jan. 28, 2023	Jan. 29, 2022
Earnings Per Share [Abstract]
Net income	$ 2,773	$ 2,973	$ 5,443	$ 5,953
Weighted-average shares—basic (in shares)	4,103	4,183	4,105	4,201
Effect of dilutive potential common shares (in shares)	13	22	10	21
Weighted-average shares—diluted (in shares)	4,116	4,205	4,115	4,222
Net income per share—basic (in dollars per share)	$ 0.68	$ 0.71	$ 1.33	$ 1.42
Net income per share—diluted (in dollars per share)	$ 0.67	$ 0.71	$ 1.32	$ 1.41
Antidilutive employee share-based awards, excluded (in shares)	17	11	91	41