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Fair Value Measurements (Tables) | 9 Months Ended
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Apr. 30, 2023
Fair Value Disclosures [Abstract] |
Fair Value, Assets And Liabilities Measured on Recurring Basis [Table Text Block] | The following tables present our financial assets and liabilities that are measured at fair value on a recurring basis as of April 30, 2023, and July 31, 2022, consistent with the fair value hierarchy:
| Fair Value as of April 30, 2023 |  | Fair Value Measurements at April 30, 2023 Using Fair Value Hierarchy |  | Fair Value as of July 31, 2022 |  | Fair Value Measurements at July 31, 2022 Using Fair Value Hierarchy
(Millions) | Level 1 |  | Level 2 |  | Level 3 |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange forward contracts(1) | $ | 3 |  |  | $ | — |  |  | $ | 3 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |
Commodity derivative contracts(2) | 4 |  |  | — |  |  | — |  |  | 4 |  |  | 23 |  |  | — |  |  | 19 |  |  | 4 |
Deferred compensation derivative contracts(3) | 1 |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Deferred compensation investments(4) | 1 |  |  | 1 |  |  | — |  |  | — |  |  | 2 |  |  | 2 |  |  | — |  |  | — |
Total assets at fair value | $ | 9 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 27 |  |  | $ | 2 |  |  | $ | 21 |  |  | $ | 4 |
| Fair Value as of April 30, 2023 |  | Fair Value Measurements at April 30, 2023 Using Fair Value Hierarchy |  | Fair Value as of July 31, 2022 |  | Fair Value Measurements at July 31, 2022 Using Fair Value Hierarchy
(Millions) |  | Level 1 |  | Level 2 |  | Level 3 |  |  | Level 1 |  | Level 2 |  | Level 3
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity derivative contracts(2) | $ | 23 |  |  | $ | 15 |  |  | $ | 8 |  |  | $ | — |  |  | $ | 30 |  |  | $ | 6 |  |  | $ | 24 |  |  | $ | — |
Deferred compensation derivative contracts(3) | — |  |  | — |  |  | — |  |  | — |  |  | 4 |  |  | — |  |  | 4 |  |  | — |
Deferred compensation obligation(4) | 90 |  |  | 90 |  |  | — |  |  | — |  |  | 96 |  |  | 96 |  |  | — |  |  | — |
Total liabilities at fair value | $ | 113 |  |  | $ | 105 |  |  | $ | 8 |  |  | $ | — |  |  | $ | 130 |  |  | $ | 102 |  |  | $ | 28 |  |  | $ | — |
___________________________________ (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.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] | The following table summarizes the changes in fair value of Level 3 assets and liabilities for the nine-month periods ended April 30, 2023, and May 1, 2022:
|  | Nine Months Ended
(Millions) |  | April 30, 2023 |  | May 1, 2022
Fair value at beginning of year |  | $ | 4 |  |  | $ | 1 |
Gains (losses) |  | 4 |  |  | 18 |
Settlements |  | (4) |  |  | (11) |
Fair value at end of quarter |  | $ | 4 |  |  | $ | 8 |

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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