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Fair Value Measurements (Fair Value Measurement Of Assets And Liabilities) (Details) - USD ($) $ in Millions | Apr. 30, 2023 | Jul. 31, 2022
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets at fair value |  | $ 8 | $ 25
Derivatives liabilities at fair value |  | 23 | 34
Measured On Recurring Basis [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets at fair value |  | 9 | 27
Total liabilities at fair value |  | 113 | 130
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 |  | 1 | 2
Total liabilities at fair value |  | 105 | 102
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 |  | 4 | 21
Total liabilities at fair value |  | 8 | 28
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 |  | 4 | 4
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 | 2
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 | 2
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] | 4 | 23
Derivatives liabilities at fair value | [2] | 23 | 30
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] |  |  |
Derivatives liabilities at fair value | [2] | 15 | 6
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] | 0 | 19
Derivatives liabilities at fair value | [2] | 8 | 24
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] | 4 | 4
Measured On Recurring Basis [Member] | Equity Contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative assets at fair value | [3] | 1 | 0
Derivatives liabilities at fair value | [3] | 0 | 4
Measured On Recurring Basis [Member] | Equity 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] | 1 | 0
Derivatives liabilities at fair value | [3] | 0 | 4
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] | 1 | 2
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] | 1 | 2
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] | 90 | 96
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] | $ 90 | $ 96
[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 index swap rates.
[4] | Based on the fair value of the participants’ investments.

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