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Fair Value of Financial Instruments, Assets and Equity Investements (Tables)
12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Fair value and carrying value of Long-term Debt
The fair value and carrying value of our senior notes were as follows: 
 
Successor
 
 
Predecessor
 
December 31,
 
 
December 31,
(Dollars in millions)
2019
 
 
2018
Fair Value
$
2,252

 
 
$
4,455

Carrying Value
2,097

 
 
7,285