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Revenue from contracts with customers - Geographic (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total operating revenues $ 363 $ 354 $ 1,075 $ 1,096
Brazil        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total operating revenues 160 83 445 254
United States        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total operating revenues 98 109 284 290
Angola        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total operating revenues 79 86 245 255
Norway        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total operating revenues 26 48 71 162
Other        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total operating revenues $ 0 $ 28 $ 30 $ 135