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Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2016
Aug. 02, 2015
Aug. 03, 2014
Derivatives, Fair Value [Line Items]      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months $ 13    
Cash Flow Hedge Ineffectiveness is Immaterial The ineffective portion and amount excluded from effectiveness testing were not material.    
Other Current Assets [Member]      
Derivatives, Fair Value [Line Items]      
Margin Deposit Assets $ 5 $ 12  
Foreign Exchange Contract [Member]      
Derivatives, Fair Value [Line Items]      
Contracts Mature Within, Months 18 months    
Commodity Derivative Contracts [Member]      
Derivatives, Fair Value [Line Items]      
Maximum Length of Contract Maturity 18 months    
Deferred Compensation Derivative Contracts [Member]      
Derivatives, Fair Value [Line Items]      
Maximum Length of Contract Maturity 12 months    
Derivatives Designated As Hedges [Member] | Foreign Exchange Contract [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount $ 91 53  
Derivatives Designated As Hedges [Member] | Interest Rate Contract [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 300 300  
DerivativeForwardInterestRateSettled   250  
Derivative instruments gain (loss) recognized in OCI   (4)  
Derivatives Designated As Hedges [Member] | Commodity Derivative Contracts [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 0 0  
Derivatives Not Designated As Hedges [Member] | Foreign Exchange Contract [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 175 230  
Derivatives Not Designated As Hedges [Member] | Currency Swap [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 0 250  
Derivatives Not Designated As Hedges [Member] | Commodity Derivative Contracts [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount 88 95  
Derivatives Not Designated As Hedges [Member] | Deferred Compensation Derivative Contracts [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount $ 44 $ 49  
Wal-Mart Stores, Inc. [Member] | Customer Concentration Risk [Member]      
Derivatives, Fair Value [Line Items]      
Entity Wide Revenue, Major Customer, Percentage Of Net Sales 20.00% 20.00% 19.00%
Top Five Customers [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member]      
Derivatives, Fair Value [Line Items]      
Entity Wide Revenue, Major Customer, Percentage Of Net Sales 40.00%