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Related party transactions - Analysis of Related Party Revenues, Operating Expenses, and Financial Items (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Related Party Transaction [Line Items]        
Total related party operating revenues $ 22   $ 43  
Total related party operating expenses 1   1  
Interest income 7   15  
Other 0   0  
Total related party financial items 7   15  
Management fee revenues        
Related Party Transaction [Line Items]        
Total related party operating revenues 21   42  
In country support services revenues        
Related Party Transaction [Line Items]        
Total related party operating revenues 0   0  
Related party inventory sales        
Related Party Transaction [Line Items]        
Total related party operating revenues 1   1  
Work performed to mobilize drilling rig for first drilling contract        
Related Party Transaction [Line Items]        
Total related party operating revenues 33   50  
Related party inventory purchases        
Related Party Transaction [Line Items]        
Total related party operating expenses 0   0  
Other related party operating expenses        
Related Party Transaction [Line Items]        
Total related party operating expenses $ 1   $ 1  
Predecessor        
Related Party Transaction [Line Items]        
Total related party operating revenues   $ 21   $ 43
Total related party operating expenses   3   4
Interest income   6   13
Other   1   1
Total related party financial items   7   14
Predecessor | Management fee revenues        
Related Party Transaction [Line Items]        
Total related party operating revenues   20   41
Predecessor | In country support services revenues        
Related Party Transaction [Line Items]        
Total related party operating revenues   1   1
Predecessor | Related party inventory sales        
Related Party Transaction [Line Items]        
Total related party operating revenues   0   1
Predecessor | Related party inventory purchases        
Related Party Transaction [Line Items]        
Total related party operating expenses   2   3
Predecessor | Other related party operating expenses        
Related Party Transaction [Line Items]        
Total related party operating expenses   $ 1   $ 1