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Fresh Start Accounting - Enterprise Value Reconciliation (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Feb. 09, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Reorganization, Chapter 11 [Line Items] |  |  |  |
Enterprise Value |  |  | $ 4,851 |
Plus: Cash and cash equivalents | $ 130 | $ 905 | 40 | $ 279
Plus: Current liabilities | 2,704 | 2,447 | 1,582 |
Plus: Asset retirement obligations (non-current portion) | 323 | 349 | 236 |
Total assets | $ 15,468 | $ 11,009 | 6,814 |
Restricted cash |  |  | 86 |
Reorganization, Chapter 11, Fresh-Start Adjustment |  |  |  |
Reorganization, Chapter 11 [Line Items] |  |  |  |
Plus: Cash and cash equivalents |  |  | 48 |
Plus: Current liabilities |  |  | 0 |
Plus: Asset retirement obligations (non-current portion) |  |  | 97 |
Plus: Other non-current liabilities |  |  | 97 |
Total assets |  |  | 359 |
Restricted cash |  |  | $ 8 |

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