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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Liabilities Measured on a Recurring Basis
The following table presents the carrying amounts and estimated fair values of our long-term debt, excluding finance leases, as well as the input level used to determine the fair values indicated below:
September 30, 2020December 31, 2019
Input LevelCarrying AmountFair ValueCarrying AmountFair Value
(Dollars in millions)
Liabilities-Long-term debt, excluding finance leases2$10,134 10,225 10,196 10,244