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Borrowings and Other Obligations (Tables)
6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Short-term Debt and Other Debt Obligations
(Dollars in millions)6/30/202112/31/2020
Finance Lease Current Portion$10 $
Other Short-term Financing Arrangements— 
Short-term Borrowings$10 $13 
11.00% Exit Notes due 2024
$2,098 $2,098 
8.75% Senior Secured Notes due 2024
460 455 
Finance Lease Long-term Portion47 48 
Long-term Debt$2,605 $2,601 
Fair Value,of Short and Long-term Borrowings
6/30/202112/31/2020
(Dollars in millions)Carrying ValueFair ValueCarrying ValueFair Value
11.00% Exit Notes due 2024
$2,098 $2,190 $2,098 $1,628 
8.75% Senior Secured Notes due 2024
460 524 455 507