Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Fair value measurement inputs and valuation techniques

The three input levels in the hierarchy of fair value measurements are defined by the FASB are generally as follows:

Input Level	Description of Input
Level 1	Observable inputs such as quoted market prices in active markets.
Level 2	Inputs other than quoted prices in active markets that are either directly or indirectly observable.
Level 3	Unobservable inputs in which little or no market data exists.

Schedule of fair value of liabilities measured on a recurring basis

The following table presents the carrying amounts and estimated fair values of our financial liabilities as of December 31, 2023 and 2022, as well as the input level used to determine the fair values indicated below:

		As of December 31,
		2023			2022
	Input Level	Carrying Amount		Fair Value	Carrying Amount	Fair Value
		(Dollars in million)
Liabilities-Long-term debt, excluding finance leases and other obligations	2	$	8,724	6,418	7,805	6,581
Indemnifications related to the sale of the Latin American business(1)	3	86		86	86	86

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(1)Nonrecurring fair value is measured as of August 1, 2022.