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Drilling units (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2019
Dec. 31, 2017
Jul. 02, 2018
Cost          
Impairment $ 0 $ (414) $ 0 $ (696)  
Fresh Start Adjustments          
Accumulated depreciation          
Fresh Start adjustments, net   (5,734)      
Drilling units          
Cost          
Opening balance 17,038 17,335 6,890    
Additions 93 117 158    
Impairment   (414)      
Closing balance 6,890 17,038 7,048 17,335  
Accumulated depreciation          
Opening balance (4,507) (4,119) (231)    
Depreciation (231) (388) (416)    
Closing balance (231) (4,507) (647) (4,119)  
Net book value $ 6,659 12,531 $ 6,401 $ 13,216 $ 6,797
Drilling units | Fresh Start Adjustments          
Cost          
Fresh Start adjustments   (10,241)      
Accumulated depreciation          
Fresh Start adjustments   4,507      
Fresh Start adjustments, net   $ (5,734)