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Leases - Supplemental Balance Sheet (Details) - USD ($)
$ in Millions
Jan. 31, 2021
Jul. 31, 2020
Leases [Abstract]    
Operating lease right-of-use assets $ 392 $ 226
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent  
Other current liabilities $ 72 46
Operating lease liabilities 391 221
Total operating lease liabilities $ 463 $ 267