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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2020
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 September 30, 2020 and December 31, 2019:
  September 30, 2020December 31, 2019
 Input
Level		Carrying
Amount		Fair
Value		Carrying
Amount		Fair
Value
 (Dollars in millions)
Long-term debt, excluding finance lease and other obligations2$32,300 33,298 34,472 35,737 
Interest rate swap contracts (see Note 10)2$127 127 51 51