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Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 31, 2021
Jan. 31, 2021
Aug. 01, 2021
Derivative Instruments, Gain (Loss) [Line Items]      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months $ 4    
Accrued Liabilities [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Margin Deposit Liabilities $ (13)   $ (14)
Foreign Exchange Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Contracts Mature Within, Months 18 months    
Interest Rate Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount $ 0   0
Commodity Derivative Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Maximum Length of Contract 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 $ 144   134
Derivatives Designated As Hedges [Member] | Commodity Derivative Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount 19   18
Derivatives Not Designated As Hedges [Member] | Foreign Exchange Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount 18   13
Derivatives Not Designated As Hedges [Member] | Commodity Derivative Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount 174   190
Derivatives Not Designated As Hedges [Member] | Embedded Derivative Financial Instruments [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount 14   38
Derivatives Not Designated As Hedges [Member] | Deferred Compensation Derivative Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Notional Amount $ 29   $ 29
Wal-Mart Stores, Inc. [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Concentration Risk, Percentage   21.00%  
Top Five Customers [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Concentration Risk, Percentage   46.00%