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Leases - Operating Lease Balances (Details) - USD ($)
$ in Millions
Jul. 31, 2021
Jul. 25, 2020
Leases [Abstract]    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Operating lease right-of-use assets $ 1,095 $ 921
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other current liabilities Other current liabilities
Operating lease liabilities $ 337 $ 341
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other long-term liabilities Other long-term liabilities
Operating lease liabilities $ 831 $ 661
Total operating lease liabilities $ 1,168 $ 1,002