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Borrowings and Other Obligations (Tables)
9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Short-term Debt and Other Debt Obligations
(Dollars in millions)9/30/202112/31/2020
Current Portion of Exit Notes and Finance Lease$211 $
Other Short-term Financing Arrangements— 
Short-term Borrowings$211 $13 
Exit Notes
$1,898 $2,098 
2028 Senior Secured Notes488 — 
2024 Senior Secured Notes
— 455 
Finance Lease Long-term Portion45 48 
Long-term Debt$2,431 $2,601 
Fair Value,of Short and Long-term Borrowings
9/30/202112/31/2020
(Dollars in millions)Carrying ValueFair ValueCarrying ValueFair Value
Exit Notes
$2,098 $2,215 $2,098 $1,628 
2028 Senior Secured Notes$488 $516 $— $— 
2024 Senior Secured Notes
$— $— $455 $507