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Derivative Instruments - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Jul. 31, 2021
Jul. 25, 2020
Derivative [Line Items]    
Right of set-off, reduction in derivative assets $ 17 $ 10
Right of set-off, reduction in derivative liabilities 17 10
Cash collateral 109  
Cash collateral   173
Net derivative liability $ 3  
Net derivative asset   $ 8
Cash flow hedges    
Derivative [Line Items]    
Derivative average remaining maturity 24 months  
Net investment hedges    
Derivative [Line Items]    
Derivative average remaining maturity 6 months