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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Fair Value of Assets and Liabilities Measured on a Recurring Basis | The following tables provide the valuation hierarchy classification of assets and liabilities that are carried at fair value and measured on a recurring basis in our Condensed Consolidated Balance Sheet:
| September 30, 2025
(dollars in millions) | Total |  | Level 1 |  | Level 2 |  | Level 3
Recurring fair value measurements: |  |  |  |  |  |  |
Marketable securities held in trusts | $ | 713 |  |  | $ | 641 |  |  | $ | 72 |  |  | $ | — |
Derivative assets | 362 |  |  | — |  |  | 362 |  |  | — |
Derivative liabilities | 342 |  |  | — |  |  | 342 |  |  | — |
| December 31, 2024
(dollars in millions) | Total |  | Level 1 |  | Level 2 |  | Level 3
Recurring fair value measurements: |  |  |  |  |  |  |
Marketable securities held in trusts | $ | 786 |  |  | $ | 721 |  |  | $ | 65 |  |  | $ | — |
Derivative assets | 187 |  |  | — |  |  | 187 |  |  | — |
Derivative liabilities | 451 |  |  | — |  |  | 451 |  |  | — |
Schedule of Assets and Liabilities Not Carried at Fair Value | The following table provides carrying amounts and fair values of financial instruments that are not carried at fair value in our Condensed Consolidated Balance Sheet:
| September 30, 2025 |  | December 31, 2024
(dollars in millions) | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Long-term debt (excluding finance leases) | $ | 38,766 |  |  | $ | 36,854 |  |  | $ | 40,991 |  |  | $ | 37,956 |
The following tables provide the valuation hierarchy classification of assets and liabilities that are not carried at fair value in our Condensed Consolidated Balance Sheet:
| September 30, 2025
(dollars in millions) | Total |  | Level 1 |  | Level 2 |  | Level 3
Long-term debt (excluding finance leases) | $ | 36,854 |  |  | $ | — |  |  | $ | 34,823 |  |  | $ | 2,031 |
| December 31, 2024
(dollars in millions) | Total |  | Level 1 |  | Level 2 |  | Level 3
Long-term debt (excluding finance leases) | $ | 37,956 |  |  | $ | — |  |  | $ | 35,180 |  |  | $ | 2,776 |

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