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Derivative Instruments - Effect of Derivative Instruments Designated as Fair Value Hedges (Details) - Interest and other income (loss), net - Interest rate derivatives - USD ($)
$ in Millions
3 Months Ended
Oct. 30, 2021
Oct. 24, 2020
Derivative [Line Items]    
Hedged items $ 26 $ 19
Derivatives designated as hedging instruments (27) (20)
Total $ (1) $ (1)