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Fair Value Disclosure (Tables)
 6 Months Ended
Jun. 30, 2022
Fair Value Disclosures [Abstract]  
Schedule of carrying amounts and estimated fair values of long-term debt, excluding capital lease obligations, and input level to determine fair values
The following table presents the carrying amounts and estimated fair values of our financial liabilities as of June 30, 2022 and December 31, 2021, as well as the input level used to determine the fair values indicated below:
  June 30, 2022December 31, 2021
 Input
Level		Carrying
Amount		Fair
Value		Carrying
Amount		Fair
Value
  (Dollars in millions)
Liabilities—Long-term debt (excluding finance lease and other obligations)2$2,153 2,109 2,154 2,298