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Derivative Instruments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Oct. 26, 2019
Jul. 27, 2019
Derivative [Line Items]    
Net derivative gains or losses to be reclassified from AOCI into earnings in next twelve months $ 3  
Gross derivative amounts 7 $ 13
Cash collateral, assets 94 76
Net derivative asset $ 1  
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