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CHAPTER 11 PROCEEDINGS - Emergence (Details) $ / shares in Units, shares in Thousands, $ in Millions |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2020 USD ($) shares | Oct. 27, 2020 USD ($) director $ / shares shares | Jan. 31, 2021 shares | Dec. 31, 2020 shares | Jul. 15, 2020 shares
Debt Instrument [Line Items] |  |  |  |  |
New common stock issued (in shares) | 83,300 | 83,300 |  | 83,300 |
Shares reserved for future issuance (in shares) |  | 4,400 |  | 9,300 |
Shares reserved for issuance of incentive plan |  | 9,300 |  |  |
Warrants exercisable |  | 5.00% |  |  |
Initial exercise price (in dollars per share) | $ / shares |  | $ 36 |  |  |
Number of existing directors remained | director |  | 1 |  |  |
Number of new directors | director |  | 7 |  |  |
Restricted Stock Units (RSUs) | Subsequent Event | Non-Employee Directors |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Granted (in shares) |  |  | 258 |  |
Restricted Stock Units (RSUs) | Subsequent Event | Executive Officer |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Granted (in shares) |  |  | 544 |  |
Performance Stock Units | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Granted (in shares) |  |  | 544 |  |
Subscription Rights |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
New common stock issued (in shares) |  | 34,600 |  |  |
Exchange of issuance of common stock | $ |  | $ 446 |  |  |
Payments for issuance costs net of fee | $ |  | $ 4 |  |  |
Subscription Right, Backstop Commitment Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
New common stock issued (in shares) |  | 3,500 |  |  |
Tier 1 Warrants |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Warrants exercisable |  | 2.00% |  |  |
Tier 2 Warrants |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Warrants exercisable |  | 3.00% |  |  |
2017 Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
New common stock issued (in shares) |  | 22,700 |  |  |
2016 Credit Agreement, Second Lien Notes, 2021 Notes And 2024 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
New common stock issued (in shares) |  | 4,400 |  |  |
EHP Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Cash acquired | $ | $ 2 | $ 2 |  |  |
Junior DIP Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
New common stock issued (in shares) |  | 821 |  |  |
Backstop Commitment Agreement | Subscription Right, Backstop Commitment Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
New common stock issued (in shares) |  |  |  |  | 3,500
Ares JV |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
New common stock issued (in shares) |  | 17,300 |  |  |

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