Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 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 June 30, 2020 and December 31, 2019:

		June 30, 2020			December 31, 2019
	Input Level	Carrying Amount		Fair Value	Carrying Amount	Fair Value
		(Dollars in millions)
Long-term debt, excluding finance lease and other obligations	2	$	34,097	34,289	34,472	35,737
Interest rate swap contracts (see Note 10)	2	$	148	148	51	51