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General information - Reclassification of Previously Reported Amounts (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Management contract revenue [1] $ 56 $ 38 $ 289 $ 338
Management contract expense [1] (44) (45) (390) (302)
Selling, general and administrative expenses (43) (47) (80) (95)
Reimbursable revenues/ expenses        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Reimbursable and other revenues 16 21 37 41
Expenses (15) (18) (34) (39)
Other revenues        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Reimbursable and other revenues [1] 0 34 30 12
Vessel and rig operating expenses        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Expenses (341) (417) $ (606) (726)
As previously reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Management contract revenue 0 0   0
Management contract expense 0 0   0
Selling, general and administrative expenses (62) (100)   (130)
As previously reported | Reimbursable revenues/ expenses        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Reimbursable and other revenues 26 21   264
Expenses (24) (20)   (262)
As previously reported | Other revenues        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Reimbursable and other revenues 46 72   127
As previously reported | Vessel and rig operating expenses        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Expenses (357) (407)   (770)
Adjustment        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Management contract revenue 56 38   338
Management contract expense (44) (45)   (302)
Selling, general and administrative expenses 19 53   35
Adjustment | Reimbursable revenues/ expenses        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Reimbursable and other revenues (10) 0   (223)
Expenses 9 2   223
Adjustment | Other revenues        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Reimbursable and other revenues (46) (38)   (115)
Adjustment | Vessel and rig operating expenses        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Expenses $ 16 $ (10)   $ 44
[1] Includes transactions with related parties. Refer to Note 32 - "Related party transactions" for further details.