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FRESH START ACCOUNTING - Reconciliation of Enterprise Value to Estimated Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Oct. 31, 2020 | Oct. 27, 2020
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Reorganizations [Abstract] |  |  |
Fair value of total equity upon emergence | $ 1,345 | $ 1,345 |
Fair value of long-term debt | 725 | 723 |
Fair value of asset retirement obligations | 593 |  |
Less: Unrestricted cash | (163) |  |
Enterprise value | 2,500 | 2,500 |
Add: Unrestricted cash |  | 163 |
Add: Current liabilities |  | 396 |
Add: Other long-term liabilities |  | 231 |
Less: Other |  | (2) |
Reorganization value |  | $ 3,288 |
Cash used temporarily | $ 118 |  | $ 118
Current liabilities |  |  | 50
Other long-term Liabilities |  |  | $ 543

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