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, 2022	Jul. 31, 2021	Jul. 31, 2020
Numerator:
Net income	$ 2,066	$ 2,062	$ 1,826
Shares used in basic per share amounts:
Weighted average common shares outstanding (in shares)	280	270	261
Shares used in diluted per share amounts:
Weighted average common shares outstanding (in shares)	280	270	261
Dilutive common equivalent shares from stock options and restricted stock awards (in shares)	4	3	3
Dilutive weighted average common shares outstanding (in shares)	284	273	264
Basic and diluted net income per share:
Basic net income per share (in dollars per share)	$ 7.38	$ 7.65	$ 6.99
Diluted net income per share (in dollars per share)	$ 7.28	$ 7.56	$ 6.92
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	0	0