Description of Business and Summary of Significant Accounting Policies - Schedule of shares used in the computation of basic and diluted net income per share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022
Numerator:
Net income	$ 2,963	$ 2,384	$ 2,066
Shares used in basic per share amounts:
Weighted-average common shares outstanding (in shares)	280	281	280
Shares used in diluted per share amounts:
Weighted-average common shares outstanding (in shares)	280	281	280
Dilutive common equivalent shares from stock options and restricted stock awards (in shares)	4	2	4
Dilutive weighted-average common shares outstanding (in shares)	284	283	284
Basic and diluted net income per share:
Basic net income per share (in dollars per share)	$ 10.58	$ 8.49	$ 7.38
Diluted net income per share (in dollars per share)	$ 10.43	$ 8.42	$ 7.28
Weighted-average stock options and restricted stock units that have been excluded from dilutive common equivalent shares outstanding due to their anti-dilutive effect (in shares)	1	1	1