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Financial Instruments (Schedule Of The Fair Value Of Derivative Instruments) (Details) - USD ($)
$ in Millions
Apr. 30, 2023
Jul. 31, 2022
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 8 $ 25
Derivative Liability, Fair Value, Gross Liability 23 34
Derivatives Designated As Hedges [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 3 5
Derivatives Designated As Hedges [Member] | Commodity Derivative Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 3
Derivatives Designated As Hedges [Member] | Foreign Exchange Forward Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 3 2
Derivatives Not Designated As Hedges [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 5 20
Derivative Liability, Fair Value, Gross Liability 23 34
Derivatives Not Designated As Hedges [Member] | Commodity Derivative Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 4 20
Derivatives Not Designated As Hedges [Member] | Commodity Derivative Contracts [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability 23 30
Derivatives Not Designated As Hedges [Member] | Equity Contracts [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 1 0
Derivatives Not Designated As Hedges [Member] | Equity Contracts [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability $ 0 $ 4