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
	Oct. 29, 2022	Oct. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 2,670	$ 2,980
Weighted-average shares—basic (in shares)	4,108	4,218
Effect of dilutive potential common shares (in shares)	8	25
Weighted-average shares—diluted (in shares)	4,116	4,243
Net income per share—basic (in dollars per share)	$ 0.65	$ 0.71
Net income per share—diluted (in dollars per share)	$ 0.65	$ 0.70
Antidilutive employee share-based awards, excluded (in shares)	38	12