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Chapter 11 Proceedings - Liabilities Subject to Compromise (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
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Reorganizations [Abstract] |  |  |
Senior under-secured external debt | $ 5,662 | $ 0 |
Accounts payable and other liabilities | 75 |  |
Accrued interest on external debt | 34 |  |
Amount due to related party | 645 |  |
Liabilities subject to compromise in combined filers | 6,416 |  |
Less: Elimination of positions held with non-filers within the Seadrill Consolidated Group | (10) |  |
Liabilities subject to compromise in consolidated group | $ 6,406 |  | $ 0

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