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CHAPTER 11 PROCEEDINGS - Rights Offering and Backstop (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
Oct. 27, 2020
Dec. 31, 2020
Oct. 31, 2020
Jul. 15, 2020
Debt Instrument [Line Items]        
New common stock issued (in shares) 83.3 83.3 83.3  
Subscription Rights        
Debt Instrument [Line Items]        
Proceeds from common stock issued $ 450      
Common stock price per share (in dollars per share) $ 13      
New common stock issued (in shares) 34.6      
Subscription Right, Backstop Commitment Agreement        
Debt Instrument [Line Items]        
New common stock issued (in shares) 3.5      
Subscription Right, Backstop Commitment Agreement | Backstop Commitment Agreement        
Debt Instrument [Line Items]        
New common stock issued (in shares)       3.5
Rights Offering | Backstop Commitment Agreement        
Debt Instrument [Line Items]        
New common stock issued (in shares)       38.1