Fair Value of Financial Instruments, Assets and Equity Investements (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Fair value and carrying value of Long-term Debt

The fair value of our long-term debt (excluding Finance Leases) in the following table is classified as Level 2 in the fair value hierarchy and is established based on observable inputs in less active markets.

	December 31, 2023				December 31, 2022
(Dollars in millions)	Carrying Value		Fair Value		Carrying Value		Fair Value
11.00% Exit Notes due 2024	$	—	$	—	$	125	$	128
6.5% Senior Secured Notes due 2028	243		258		482		482
8.625% Senior Notes due 2030	1,587		1,673		1,586		1,544
Long-Term Debt (excluding Finance Leases)	$	1,830	$	1,931	$	2,193	$	2,154