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		9 Months Ended
	Apr. 30, 2022	May 01, 2021	Apr. 30, 2022	May 01, 2021
Earnings Per Share [Abstract]
Net income	$ 3,044	$ 2,863	$ 8,997	$ 7,582
Weighted-average shares—basic (in shares)	4,152	4,219	4,184	4,224
Effect of dilutive potential common shares (in shares)	18	19	20	13
Weighted-average shares—diluted (in shares)	4,170	4,238	4,204	4,237
Net income per share—basic (in dollars per share)	$ 0.73	$ 0.68	$ 2.15	$ 1.79
Net income per share—diluted (in dollars per share)	$ 0.73	$ 0.68	$ 2.14	$ 1.79
Antidilutive employee share-based awards, excluded (in shares)	11	15	46	55