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Fair Value Measurements (Fair Value Measurement Of Assets And Liabilities) (Details) - USD ($)
$ in Millions
May 01, 2022
Aug. 01, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value $ 56 $ 57
Derivatives liabilities at fair value 6 3
Measured On Recurring Basis [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value 58 60
Total liabilities at fair value 95 108
Measured On Recurring Basis [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value 8 24
Total liabilities at fair value 89 105
Measured On Recurring Basis [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value 42 35
Total liabilities at fair value 6 3
Measured On Recurring Basis [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets at fair value 8 1
Measured On Recurring Basis [Member] | Foreign Exchange Forward Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [1] 3 1
Derivatives liabilities at fair value [1] 0 3
Measured On Recurring Basis [Member] | Foreign Exchange Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [1] 3 1
Derivatives liabilities at fair value [1] 0 3
Measured On Recurring Basis [Member] | Commodity Derivative Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [2] 53 53
Derivatives liabilities at fair value [2] 2 0
Measured On Recurring Basis [Member] | Commodity Derivative Contracts [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [2] 6 21
Measured On Recurring Basis [Member] | Commodity Derivative Contracts [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [2] 39 31
Derivatives liabilities at fair value [2] 2 0
Measured On Recurring Basis [Member] | Commodity Derivative Contracts [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [2] 8 1
Measured On Recurring Basis [Member] | Deferred Compensation Derivative Contracts [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [3] 0 3
Derivatives liabilities at fair value [3] 4 0
Measured On Recurring Basis [Member] | Deferred Compensation Derivative Contracts [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets at fair value [3] 0 3
Derivatives liabilities at fair value [3] 4 0
Measured On Recurring Basis [Member] | Deferred Compensation Investment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments at fair value [4] 2 3
Measured On Recurring Basis [Member] | Deferred Compensation Investment [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments at fair value [4] 2 3
Measured On Recurring Basis [Member] | Deferred Compensation Obligation [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation obligation [4] 89 105
Measured On Recurring Basis [Member] | Deferred Compensation Obligation [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation obligation [4] $ 89 $ 105
[1] Based on observable market transactions of spot currency rates and forward rates.
[2] Level 1 and 2 are based on quoted futures exchanges and on observable prices of futures and options transactions in the marketplace. Level 3 is based on unobservable inputs in which there is little or no market data, which requires management’s own assumptions within an internally developed model.
[3] Based on equity index swap rates.
[4] Based on the fair value of the participants’ investments.