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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 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 September 30, 2025 and December 31, 2024, as well as the input level used to determine the fair values indicated below:

  September 30, 2025December 31, 2024
 
Input Level
Carrying
Amount
Fair Value
Carrying
Amount
Fair Value
  (Dollars in millions)
Liabilities—Long-term debt (excluding finance leases)
2$1,686 1,336 1,924 1,462