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Stockholders' Equity - Share-based compensation expense (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Jul. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 1,712 $ 1,308 $ 753
Income tax benefit (373) (396) (269)
Decrease in net income $ 1,339 $ 912 $ 484
Share Based Compensation Expense      
Decrease in net income per share:      
Basic (in dollars per share) $ 4.77 $ 3.26 $ 1.79
Diluted (in dollars per share) $ 4.73 $ 3.21 $ 1.77
Total share-based compensation expense      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 1,712 $ 1,308 $ 753
Cost of product revenue      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 3 2 1
Cost of service and other revenue      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 371 144 68
Selling and marketing      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 429 309 183
Research and development      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 532 521 281
General and administrative      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 377 $ 332 $ 220