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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2026
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis | The fair value hierarchy for assets and liabilities measured at fair value at June 30, 2026, and December 31, 2025, is shown in the table below. Refer to Note 14. Financial and Derivative Instruments for the gross amounts of derivative assets and liabilities. Assets and Liabilities Measured at Fair Value on a Recurring Basis
| At June 30, 2026 |  | At December 31, 2025
| (Millions of dollars)
| Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Derivatives - not designated | $ | 30 |  |  | $ | 17 |  |  | $ | 13 |  |  | $ | — |  |  | $ | 254 |  |  | $ | 228 |  |  | $ | 26 |  |  | $ | — |
Derivatives - designated | — |  |  | — |  |  | — |  |  | — |  |  | 10 |  |  | 10 |  |  | — |  |  | — |
Total Assets at Fair Value | $ | 30 |  |  | $ | 17 |  |  | $ | 13 |  |  | $ | — |  |  | $ | 264 |  |  | $ | 238 |  |  | $ | 26 |  |  | $ | — |
Derivatives - not designated | 28 |  |  | 14 |  |  | 14 |  |  | — |  |  | 68 |  |  | 15 |  |  | 53 |  |  | — |
Derivatives - designated | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total Liabilities at Fair Value | $ | 28 |  |  | $ | 14 |  |  | $ | 14 |  |  | $ | — |  |  | $ | 68 |  |  | $ | 15 |  |  | $ | 53 |  |  | $ | — |

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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/2009/role/commonPracticeRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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