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Fair Value of Financial Instruments, Assets and Other Assets (Tables)
 12 Months Ended
Dec. 31, 2024
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, 2024
December 31, 2023
(Dollars in millions)Carrying ValueFair ValueCarrying ValueFair Value
6.5% Senior Secured Notes due 2028
— — 243 258 
8.625% Senior Notes due 2030
1,586 1,650 1,587 1,673 
Long-Term Debt (excluding Finance Leases)$1,586 $1,650 $1,830 $1,931