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Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 01, 2021
Aug. 02, 2020
Jul. 28, 2019
Derivative Instruments, Gain (Loss) [Line Items]      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months $ 1    
Other Current Assets [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Margin Deposit Assets   $ 8  
Accrued Liabilities [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
us-gaap_MarginDepositLiabilities $ 14    
Foreign Exchange Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Maximum Remaining Maturity of Foreign Currency Derivatives 18 months    
Interest Rate Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount $ 0 0  
Treasury Lock [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount $ 0 0  
Commodity Derivative Contracts [Member] | Maximum [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Remaining Maturity 18 months    
Deferred Compensation Derivative Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Maximum Length of Contract Maturity 12 months    
Derivatives Designated As Hedges [Member] | Foreign Exchange Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount $ 134 164  
Derivatives Designated As Hedges [Member] | Commodity Derivative Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount 18 0  
Derivatives Not Designated As Hedges [Member] | Foreign Exchange Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount 13 19  
Derivatives Not Designated As Hedges [Member] | Commodity Derivative Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount 190 137  
Derivatives Not Designated As Hedges [Member] | Embedded Derivative Financial Instruments [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount 38 34  
Derivatives Not Designated As Hedges [Member] | Deferred Compensation Derivative Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount $ 29 $ 22  
Wal-Mart Stores, Inc. [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Entity Wide Revenue, Major Customer, Percentage Of Net Sales 21.00% 21.00% 20.00%
Top Five Customers [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Entity Wide Revenue, Major Customer, Percentage Of Net Sales 46.00%