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Stockholders' Equity - Schedule of Total Share-based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 31, 2026
Jan. 31, 2025
Jan. 31, 2026
Jan. 31, 2025
Options Outstanding        
Total share-based compensation expense $ 521 $ 498 $ 1,064 $ 1,009
Cost of revenue        
Options Outstanding        
Total share-based compensation expense 94 110 191 221
Selling and marketing        
Options Outstanding        
Total share-based compensation expense 150 136 306 273
Research and development        
Options Outstanding        
Total share-based compensation expense 178 161 363 322
General and administrative        
Options Outstanding        
Total share-based compensation expense $ 99 $ 91 $ 204 $ 193