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Investment in associated companies - Statement of Operations (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Aug. 31, 2019
Schedule of Equity Method Investments [Line Items]          
Operating revenues $ 541 $ 712 $ 1,059 $ 1,388  
Net operating (loss)/income (175) (613) (4,482) (295)  
Net (loss)/income (602) (3,881) (4,659) (1,219)  
Share in results from associated companies (net of tax) $ (90) $ 149 $ (77) $ (115)  
Seadrill Partners          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage     18.00%    
Share in results from associated companies (net of tax)     $ (75)    
Seabras Sapura          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage 50.00% 50.00% 50.00% 50.00%  
Net (loss)/income allocated to ownership interests $ 44 $ 46 $ 38 $ 57  
Amortization of basis differences (20) 0 (18) (28)  
Share in results from associated companies (net of tax) $ 24 $ 46 $ 20 $ 29  
SeaMex          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage 50.00% 50.00% 50.00% 50.00%  
Net (loss)/income allocated to ownership interests $ 2 $ 4 $ (6) $ 9  
Amortization of basis differences (14) 0 (16) (28)  
Share in results from associated companies (net of tax) $ (12) $ 4 $ (22) $ (19)  
Sonadrill          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage 0.00% 0.00% 50.00% 50.00%  
Net (loss)/income allocated to ownership interests $ 0 $ 0 $ (2) $ (1)  
Share in results from associated companies (net of tax) $ 0 $ 0 $ (2) $ (1)  
Gulfdrill          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage 0.00% 0.00% 50.00% 50.00% 50.00%
Net (loss)/income allocated to ownership interests $ 0 $ 0 $ 2 $ 0  
Share in results from associated companies (net of tax) 0 0 2 0  
Seadrill Partners          
Schedule of Equity Method Investments [Line Items]          
Operating revenues 426 612   750  
Net operating (loss)/income 100 257   51  
Net (loss)/income (127) 201   (187)  
Seabras Sapura          
Schedule of Equity Method Investments [Line Items]          
Operating revenues 232 241 360 434  
Net operating (loss)/income 124 125 103 198  
Net (loss)/income 88 92 75 113  
SeaMex          
Schedule of Equity Method Investments [Line Items]          
Operating revenues 118 121 234 232  
Net operating (loss)/income 40 40 49 70  
Net (loss)/income 4 7 (13) 18  
Sonadrill          
Schedule of Equity Method Investments [Line Items]          
Operating revenues 0 0 56 22  
Net operating (loss)/income 0 0 (2) (1)  
Net (loss)/income 0 0 (5) (2)  
Gulfdrill          
Schedule of Equity Method Investments [Line Items]          
Operating revenues 0 0 44 0  
Net operating (loss)/income 0 0 6 0  
Net (loss)/income 0 0 4 0  
Seadrill Partners - Direct ownership investments | Seadrill Partners          
Schedule of Equity Method Investments [Line Items]          
Net (loss)/income allocated to ownership interests (59) 77   (92)  
Amortization of basis differences (23) 0   (15)  
Share in results from associated companies (net of tax) (82) 77 $ (75) (107)  
Seadrill Partners - Subordinated Units | Seadrill Partners          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage     100.00%    
Net (loss)/income allocated to ownership interests (15) 22   (17)  
Amortization of basis differences (5) 0   0  
Share in results from associated companies (net of tax) $ (20) $ 22 $ 0 $ (17)