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Derivative Instruments - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 25, 2020
Jul. 27, 2019
Derivative [Line Items]    
Right of set-off, reduction in derivative assets $ 10 $ 13
Right of set-off, reduction in derivative liabilities 10 13
Cash collateral 173 76
Net derivative asset $ 8 $ 2
Cash flow hedges    
Derivative [Line Items]    
Derivative average remaining maturity 24 months  
Net investment hedging instruments    
Derivative [Line Items]    
Derivative average remaining maturity 6 months