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Borrowings and Other Obligations (Tables)
9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Short-term Debt and Other Debt Obligations
(Dollars in millions)9/30/202012/31/2019
Finance Lease Current Portion$$10 
Other Short-term Financing Arrangements
Short-term Borrowings$14 $13 
11.00% Exit Notes due 2024
$2,098 $2,097 
8.75% Senior Secured Notes due 2024
456 — 
Finance Lease Long-term Portion48 54 
Long-term Debt$2,602 $2,151 
Fair Value,of Short and Long-term Borrowings
(Dollars in millions)9/30/202012/31/2019
11.00% Exit Notes due 2024
$1,269 $2,252 
8.75% Senior Secured Notes due 2024
511 — 
Fair Value$1,780 $2,252 
Carrying Value$2,554 $2,097