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Financial Instruments (Derivatives Not Designated As Hedges) (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2022
Aug. 01, 2021
Aug. 02, 2020
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of (Gain) or Loss Recognized in Earnings on Derivatives $ 11 $ (61) $ 8
Foreign Exchange Contract [Member] | Cost Of Products Sold [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of (Gain) or Loss Recognized in Earnings on Derivatives 0 2 (1)
Foreign Exchange Contract [Member] | Other Expenses/Income [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of (Gain) or Loss Recognized in Earnings on Derivatives 0 0 2
Commodity Derivative Contracts [Member] | Cost Of Products Sold [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of (Gain) or Loss Recognized in Earnings on Derivatives 8 (55) 12
Deferred Compensation Derivative Contracts [Member] | General and Administrative Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of (Gain) or Loss Recognized in Earnings on Derivatives 3 (8) (2)
Treasury Lock [Member] | Interest Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of (Gain) or Loss Recognized in Earnings on Derivatives $ 0 $ 0 $ (3)