Description of Business and Summary of Significant Accounting Policies - 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, 2023	Apr. 30, 2022	Apr. 30, 2023	Apr. 30, 2022
Accounting Policies [Abstract]
Net income	$ 2,087	$ 1,794	$ 2,295	$ 2,122
Shares used in basic per share amounts:
Weighted-average common shares outstanding (in shares)	281	282	281	279
Shares used in diluted per share amounts:
Weighted-average common shares outstanding (in shares)	281	282	281	279
Dilutive common equivalent shares from stock options and restricted stock awards (in shares)	2	4	2	5
Dilutive weighted-average common shares outstanding (in shares)	283	286	283	284
Basic and diluted net income per share:
Basic net income per share (in dollars per share)	$ 7.44	$ 6.35	$ 8.17	$ 7.60
Diluted net income per share (in dollars per share)	$ 7.38	$ 6.28	$ 8.11	$ 7.48
Shares excluded from diluted net income per share:
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)	2	2	2	1