Stockholders' Equity - Share-Based Compensation Expense (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 753	$ 435	$ 401
Income tax benefit	(269)	(173)	(200)
Decrease in net income	484	262	201
Software and Software Development Costs
Decrease in net income per share:
Share-based compensation expense	$ 2	$ 3	$ 4
Share Based Compensation Expense
Decrease in net income per share:
Basic (in dollars per share)	$ 1.79	$ 1.00	$ 0.77
Diluted (in dollars per share)	$ 1.77	$ 0.99	$ 0.76
Total share-based compensation expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 753	$ 435	$ 401
Cost of product revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	1	1	1
Cost of service and other revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	68	59	57
Selling and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	183	116	103
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	281	151	136
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 220	$ 108	$ 104

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