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Leases - Supplemental Balance Sheet (Details) - USD ($)
$ in Millions
Jan. 31, 2022
Jul. 31, 2021
Leases [Abstract]    
Operating lease right-of-use assets $ 439 $ 380
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current  
Other current liabilities $ 76 66
Operating lease liabilities 429 380
Total operating lease liabilities $ 505 $ 446