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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Carrying Amounts and Estimated Fair Values | The following table presents the carrying amounts and estimated fair values of our financial liabilities as of June 30, 2025 and December 31, 2024, as well as the input level used to determine the fair values indicated below:
|  |  | June 30, 2025 |  | December 31, 2024
| Input Level |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
|  |  | (Dollars in millions)
Liabilities—Long-term debt (excluding finance leases) | 2 |  | $ | 1,924 |  |  | 1,471 |  |  | 1,924 |  |  | 1,462 |

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