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Fair Value Disclosure (Tables)
 3 Months Ended
Mar. 31, 2024
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 March 31, 2024 and December 31, 2023, as well as the input level used to determine the fair values indicated below:
  March 31, 2024December 31, 2023
 Input
Level		Carrying
Amount		Fair
Value		Carrying
Amount		Fair
Value
  (Dollars in millions)
Liabilities—Long-term debt (excluding finance lease and other obligations)2$1,938 925 2,153 1,162