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Leases - Supplemental Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Jul. 31, 2021
Jul. 25, 2020
Leases [Abstract]    
Cash paid for amounts included in the measurement of lease liabilities — operating cash flows $ 407 $ 413
Right-of-use assets obtained in exchange for operating leases liabilities $ 536 $ 197