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Drilling units (Details)
$ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
rig
Jun. 26, 2023
rig
Jul. 01, 2022
USD ($)
rig
Feb. 23, 2022
USD ($)
Mar. 31, 2022
USD ($)
Feb. 22, 2022
USD ($)
Jun. 30, 2023
USD ($)
rig
Mar. 31, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
rig
May 19, 2023
rig
Property, Plant and Equipment [Line Items]                        
Aquadrill acquisition             $ 1,255          
Depreciation           $ (17)       $ (52) $ (73)  
Classified as held for sale, cost             276          
Classified as held for sale, accumulated depreciation             56          
Classified as held for sale, net book value             $ (220)          
Number of tender rigs acquired through acquisition | rig 3           3       3 3
Number of benign environment jack-up rigs | rig 3 3 3                  
Drilling units                        
Property, Plant and Equipment [Line Items]                        
Opening balance, cost     $ 1,627     2,241 $ 1,781 $ 1,761 $ 1,591   $ 1,761  
Opening balance, accumulated depreciation     (40)     (810) (123) (93) (12)   (93)  
Opening balance, net book value     $ 1,587     1,431 1,658 1,668 1,579   1,668  
Additions         $ 16 20   21 60      
Additions             37          
Depreciation         (12) (17) (52) (31) (28)      
Disposals, cost           (23)   (1) (24)      
Disposals, accumulated depreciation           23   1 0      
Disposals, net book value           0   0 (24)      
Derecognitions, cost       $ (211)                
Derecognitions, accumulated depreciation       36                
Derecognitions net       175                
Closing balance, cost $ 2,797     1,575 1,591   2,797 1,781 1,627 1,627 2,797  
Closing balance, accumulated depreciation (119)     0 (12)   (119) (123) (40) (40) (119)  
Closing balance, net book value $ 2,678     1,575 1,579   $ 2,678 $ 1,658 $ 1,587 1,587 $ 2,678  
Drilling units | Reorganization, chapter 11, predecessor, before adjustment                        
Property, Plant and Equipment [Line Items]                        
Opening balance, cost       2,238 2,238         2,238    
Opening balance, accumulated depreciation       (804) (804)         (804)    
Opening balance, net book value       1,434 1,434         1,434    
Closing balance, cost           2,238            
Closing balance, accumulated depreciation           (804)            
Closing balance, net book value           1,434            
Drilling units | Reorganization, chapter 11, fresh-start adjustment                        
Property, Plant and Equipment [Line Items]                        
Opening balance, cost       452 452         452    
Opening balance, accumulated depreciation       (768) (768)         (768)    
Opening balance, net book value       $ (316) $ (316)         $ (316)    
Closing balance, cost           452            
Closing balance, accumulated depreciation           (768)            
Closing balance, net book value           $ (316)