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Previous Chapter 11 Proceedings - Schedule of Reorganization Items (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Reorganizations [Abstract] |  |  |  |
Professional and advisory fees | $ (9) | $ (187) | $ 0 | $ 0
Gain on liabilities subject to compromise | 0 | 2,958 | 0 | 0
Fresh start valuation adjustments | 0 | (6,142) | 0 | 0
Interest income on surplus cash invested | 0 | 6 | 0 | 0
Reorganization items, net | $ (9) | $ (3,365) | $ 0 | $ 0

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