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Chapter 11 Proceedings - Liabilities Subject to Compromise (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
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