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Borrowings - Schedule of Short-Term Debt (Details) - USD ($)
$ in Millions
Jul. 31, 2021
Jul. 25, 2020
Short-term Debt [Line Items]    
Amount $ 2,508 $ 3,005
Current portion of long-term debt    
Short-term Debt [Line Items]    
Amount $ 2,508 $ 3,005
Effective Rate 1.75% 2.07%