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Borrowings and Other Obligations (Tables)
3 Months Ended
Mar. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Short-term Debt and Other Debt Obligations
(Dollars in millions)March 31, 2023December 31, 2022
Current Portion of Finance Leases$15 $14 
Current Portion of 6.50% Senior Secured Notes due 2028 “2028 Senior Secured Notes”
— 11 
Current Portion of 11.00% Exit Notes due 2024 “Exit Notes”
105 20 
Current Portion of Long-term Debt$120 $45 
11.00% Exit Notes due 2024 “Exit Notes”
$— $105 
6.50% Senior Secured Notes due 2028 “2028 Senior Secured Notes”
441 471 
8.625% Senior Notes due 2030 “2030 Senior Notes”
1,586 1,586 
Long-term Portion Finance Leases 40 41 
Long-term Debt$2,067 $2,203 
Fair Value,of Short and Long-term Borrowings
March 31, 2023December 31, 2022
(Dollars in millions)Carrying ValueFair ValueCarrying ValueFair Value
11.00% Exit Notes due 2024
$105 $108 $125 $128 
6.50% Senior Secured Notes due 2028
441 452 482 482 
8.625% Senior Notes due 2030
1,586 1,626 1,586 1,544 
Long-Term Debt (excluding Finance Leases)$2,132 $2,186 $2,193 $2,154