Stockholders' Equity - Share-based compensation expense (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1,940	$ 1,712	$ 1,308
Income tax benefit	(594)	(373)	(396)
Decrease in net income	$ 1,346	$ 1,339	$ 912
Share Based Compensation Expense
Decrease in net income per share:
Basic (in dollars per share)	$ 4.81	$ 4.77	$ 3.26
Diluted (in dollars per share)	$ 4.74	$ 4.73	$ 3.21
Total share-based compensation expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1,940	$ 1,712	$ 1,308
Cost of service revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	398	371	137
Cost of product and other revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	4	3	9
Selling and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	506	429	309
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	639	532	521
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	368	377	332
Restructuring Charges
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 25	$ 0	$ 0

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