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Fair Value of Financial Instruments, Assets and Equity Investements (Tables)
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Fair value and carrying value of Long-term Debt
December 31, 2021December 31, 2020
(Dollars in millions)Carrying ValueFair ValueCarrying ValueFair Value
11.00% Exit Notes due 2024
$300 $311 $2,098 $1,628 
8.75% Senior Secured Notes due 2024
— — 455 507 
6.5% Senior Secured Notes due 2028
488 528 — — 
8.625% Senior Notes due 2030
1,584 1,660 — — 
Total Long-Term Debt$2,372 $2,499 $2,553 $2,135