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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 Fair Value Measurement Inputs and Valuation Techniques | The three input levels in the hierarchy of fair value measurements are defined by the FASB generally as follows:
Input Level |  | Description of Input
Level 1 |  | Observable inputs such as quoted market prices in active markets.
Level 2 |  | Inputs other than quoted prices in active markets that are either directly or indirectly observable.
Level 3 |  | Unobservable inputs in which little or no market data exists.
Schedule of Carrying Amounts and Estimated Fair Values of Financial Assets and Liabilities | The following table presents the carrying amounts and estimated fair values of our financial assets and liabilities as of June 30, 2025 and December 31, 2024:
|  |  | June 30, 2025 |  | December 31, 2024
| Input Level |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
|  |  | (Dollars in millions)
Long-term debt, excluding finance lease and other obligations | 2 |  | $ | 17,655 |  |  | 17,530 |  |  | 17,652 |  |  | 17,127 |
Indemnifications related to the sale of the Latin American business(1) | 3 |  | 87 |  |  | 84 |  | 87 |  |  | 84 |
______________________________________________________________________ (1)Nonrecurring fair value is measured as of August 1, 2022.

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