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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

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