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, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Accounting Policies [Abstract]
Net income	$ 1,794	$ 1,464	$ 2,122	$ 1,682
Shares used in basic per share amounts:
Weighted average common shares outstanding (in shares)	282	273	279	269
Shares used in diluted per share amounts:
Weighted average common shares outstanding (in shares)	282	273	279	269
Dilutive common equivalent shares from stock options and restricted stock awards (in shares)	4	3	5	2
Dilutive weighted average common shares outstanding (in shares)	286	276	284	271
Basic and diluted net income per share:
Basic net income per share (in dollars per share)	$ 6.35	$ 5.36	$ 7.60	$ 6.26
Diluted net income per share (in dollars per share)	$ 6.28	$ 5.30	$ 7.48	$ 6.20
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	0	1	0