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Segment analysis - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Segment analysis        
Revenue $ 1,255 $ 1,303 $ 2,386 $ 2,440
Europe        
Segment analysis        
Revenue 555 533 1,041 1,032
Americas        
Segment analysis        
Revenue 700 770 1,345 1,408
Europe        
Segment analysis        
Revenue 552 530 1,030 1,025
Europe | Europe        
Segment analysis        
Revenue 552 530 1,030 1,025
North America        
Segment analysis        
Revenue 608 599 1,157 1,120
North America | Europe        
Segment analysis        
Revenue   2 7 4
North America | Americas        
Segment analysis        
Revenue 608 597 1,150 1,116
Rest of the world        
Segment analysis        
Revenue 95 174 199 295
Rest of the world | Europe        
Segment analysis        
Revenue 3 1 4 3
Rest of the world | Americas        
Segment analysis        
Revenue 92 173 195 292
Over time        
Segment analysis        
Revenue 998 1,036 1,910 1,950
Point in time        
Segment analysis        
Revenue $ 257 $ 267 $ 476 $ 490