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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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