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Segment information - Geographic Revenues (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total Revenue $ 541 $ 712 $ 1,059 $ 1,388
Norway        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total Revenue 117 82 480 469
Nigeria        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total Revenue 108 105 0 198
Brazil        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total Revenue 91 188 51 137
Saudi Arabia        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total Revenue 78 79 98 130
United States        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total Revenue 34 30 107 74
Angola        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total Revenue 29 100 89 215
Others        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total Revenue $ 84 $ 128 $ 234 $ 165