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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2022
Apr. 30, 2021
Jul. 31, 2021
Income Tax Disclosure [Abstract]          
Excess tax benefits on share-based compensation $ 26 $ 13 $ 135 $ 77  
Effective tax rate 24.00% 24.00% 20.00% 22.00%  
Effective tax rate, excluding discrete tax benefits 26.00% 25.00% 26.00% 25.00%  
Total amount of unrecognized tax benefits         $ 190
Favorable net impact to income tax expense due to recognition of tax benefits $ 109   $ 109    
Noncurrent income taxes receivable $ 91   $ 91   $ 75