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Related party transactions - Analysis of Related Party Revenues, Operating Expenses, and Financial Items (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2019
Dec. 31, 2017
Related Party Transaction [Line Items]        
Total related party operating revenues $ 46 $ 43 $ 110 $ 110
Total related party operating expenses 1 4 3 13
Total related party receivables 716   704  
Reimbursable amounts due from customers 10   21  
Management fee revenues        
Related Party Transaction [Line Items]        
Total related party operating revenues 41 41 109 84
In country support services revenues        
Related Party Transaction [Line Items]        
Total related party operating revenues 0 1 0 23
Related party inventory sales        
Related Party Transaction [Line Items]        
Total related party operating revenues 1 1 1 0
Other        
Related Party Transaction [Line Items]        
Total related party operating revenues 4 0 0 3
Work performed to mobilize drilling rig for first drilling contract        
Related Party Transaction [Line Items]        
Total related party operating revenues     167  
Total related party receivables     55  
In country support services expenses        
Related Party Transaction [Line Items]        
Total related party operating expenses 0 1 0 8
Interest income 15 12 26 34
Gains on related party derivatives 0 0 0 1
Interest income recognized on deferred contingent consideration 1 2 4 3
Total related party financial items 16 14 30 38
Related party inventory purchases        
Related Party Transaction [Line Items]        
Total related party operating expenses 0 0 1 3
Other related party operating expenses        
Related Party Transaction [Line Items]        
Total related party operating expenses 1 3 2 3
Net bareboat charter arrangements        
Related Party Transaction [Line Items]        
Total related party operating revenues $ 0 $ 0 0 $ 1
Related party reimbursable expenses        
Related Party Transaction [Line Items]        
Reimbursable amounts due from customers     $ 5