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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2025
Fair Value Disclosures [Abstract] |
Schedule of cash and cash equivalents and other investments reconciliation from adjusted cost to fair value | Our cash and cash equivalents and other investments consist of the following:
| December 31, 2025
| Cost Basis |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (in millions)
Cash | $ | 629 |  |  | $ | — |  |  | $ | — |  |  | $ | 629 |
Cash equivalents: |  |  |  |  |  |  |
U.S. and Canadian government obligations | 284 |  |  | — |  |  | — |  |  | 284 |
Other debt securities | 1,069 |  |  | — |  |  | — |  |  | 1,069 |
Total cash and cash equivalents | $ | 1,982 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,982 |
Nonqualified employee benefit trusts | 15 |  |  | 3 |  |  | — |  |  | 18 |
| December 31, 2024
| Cost Basis |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (in millions)
Cash | $ | 168 |  |  | $ | — |  |  | $ | — |  |  | $ | 168 |
Cash equivalents: |  |  |  |  |  |  |
U.S. and Canadian government obligations | 932 |  |  | — |  |  | — |  |  | 932 |
Other debt securities | 514 |  |  | — |  |  | — |  |  | 514 |
Total cash and cash equivalents | $ | 1,614 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,614 |
Nonqualified employee benefit trusts | 15 |  |  | 2 |  |  | — |  |  | 17 |
Schedule of assets and liabilities measured at fair value on a recurring basis | The following tables present assets and liabilities included in our consolidated balance sheets as of December 31, 2025 and 2024 that are recognized at fair value on a recurring basis, and indicate the fair value hierarchy utilized to determine such fair value:
| December 31, 2025
| Total Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (in millions)
Cash equivalents | $ | 1,353 |  |  | $ | 1,353 |  |  | $ | — |  |  | $ | — |
Nonqualified employee benefit trusts | 18 |  |  | 18 |  |  | — |  |  | — |
Derivative assets | 1 |  |  | — |  |  | 1 |  |  | — |
Derivative liabilities | (5) |  |  | — |  |  | (5) |  |  | — |
| December 31, 2024
| Total Fair Value |  | Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (in millions)
Cash equivalents | $ | 1,446 |  |  | $ | 1,446 |  |  | $ | — |  |  | $ | — |
Nonqualified employee benefit trusts | 17 |  |  | 17 |  |  | — |  |  | — |
Derivative assets | 4 |  |  | — |  |  | 4 |  |  | — |
Derivative liabilities | (3) |  |  | — |  |  | (3) |  |  | — |
Schedule of carrying amounts and estimated fair values of financial instruments | The carrying amount and estimated fair value of our financial instruments are as follows:
| December 31, 2025 |  | December 31, 2024
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
| (in millions)
Long-term debt | $ | 3,215 |  |  | $ | 3,131 |  |  | $ | 2,971 |  |  | $ | 2,827 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + 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/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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