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Borrowings and Other Debt Obligations (Tables)
 6 Months Ended
Jun. 30, 2024
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt
(Dollars in millions)June 30, 2024December 31, 2023
Current Portion of 6.50% Senior Secured Notes due 2028 “2028 Senior Secured Notes”
$— $151 
Current Portion of Finance Leases20 17 
Current Portion of Long-term Debt$20 $168 
8.625% Senior Notes due 2030 “2030 Senior Notes”
$1,588 $1,587 
6.50% Senior Secured Notes due 2028 “2028 Senior Secured Notes”
— 92 
Finance Leases
40 36 
Long-term Debt$1,628 $1,715 
Fair Value and Carrying Value of Long-Term Debt The table below presents the fair value and carrying value of our long-term debt (excluding finance leases).
June 30, 2024December 31, 2023
(Dollars in millions)Carrying ValueFair ValueCarrying ValueFair Value
6.50% Senior Secured Notes due 2028
$— $— $243 $258 
8.625% Senior Notes due 2030
1,588 1,658 1,587 1,673 
Long-Term Debt (excluding Finance Leases)$1,588 $1,658 $1,830 $1,931