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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 31, 2026
Jan. 31, 2025
Jan. 31, 2026
Jan. 31, 2025
Jul. 31, 2025
Income Tax Disclosure [Abstract]          
Tax shortfalls (benefits) on share-based compensation $ 21 $ 29 $ 51 $ 57  
Effective tax rate 20.00% 17.00% 20.00% 15.00%  
Effective tax rate, excluding discrete tax benefits     24.00% 24.00%  
Unrecognized tax benefits         $ 394
Unrecognized tax benefits that would impact effective tax rate $ 276   $ 276    
Long-term liability for uncertain tax positions $ 61   $ 61   $ 61