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Restructuring and Other Charges - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2021
Jul. 25, 2020
Jul. 27, 2019
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 886 $ 481 $ 322
FISCAL 2021 PLAN      
Restructuring Cost and Reserve [Line Items]      
Expected pretax restructuring charges 900    
Restructuring charges 881    
Fiscal 2020 Plan      
Restructuring Cost and Reserve [Line Items]      
Expected pretax restructuring charges 300    
Restructuring charges $ 260