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Borrowings and Other Obligations (Tables)
9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Short-term Debt and Other Debt Obligations
(Dollars in millions)September 30, 2023December 31, 2022
Current Portion of 6.50% Senior Secured Notes due 2028 “2028 Senior Secured Notes”
$75 $11 
Current Portion of Finance Leases16 14 
Current Portion of 11.00% Exit Notes due 2024 “Exit Notes”
— 20 
Current Portion of Long-term Debt$91 $45 
8.625% Senior Notes due 2030 “2030 Senior Notes”
$1,587 $1,586 
6.50% Senior Secured Notes due 2028 “2028 Senior Secured Notes”
242 471 
Finance Leases
35 41 
11.00% Exit Notes due 2024 “Exit Notes”
— 105 
Long-term Debt$1,864 $2,203 
Fair Value,of Short and Long-term Borrowings
September 30, 2023December 31, 2022
(Dollars in millions)Carrying ValueFair ValueCarrying ValueFair Value
11.00% Exit Notes due 2024
$— $— $125 $128 
6.50% Senior Secured Notes due 2028
317 323 482 482 
8.625% Senior Notes due 2030
1,587 1,612 1,586 1,544 
Long-Term Debt (excluding Finance Leases)$1,904 $1,935 $2,193 $2,154