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Derivative Instruments - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jan. 25, 2020
Jul. 27, 2019
Derivative [Line Items]    
Gross derivative amounts $ 14 $ 13
Cash collateral, assets 86 76
Net derivative asset $ 2  
Net derivative liability   $ 2
Derivatives designated as cash flow hedging instruments:    
Derivative [Line Items]    
Foreign currency cash flow hedges maturity period, maximum, months 24 months