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Segment analysis - Segment Results (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
customer
Jun. 30, 2022
USD ($)
customer
Jun. 30, 2023
USD ($)
customer
Jun. 30, 2022
USD ($)
customer
Segment analysis        
Revenue $ 1,255 $ 1,303 $ 2,386 $ 2,440
Adjusted EBITDA $ 151 $ 181 $ 281 $ 326
Number of customers accounting for greater than 10% of revenue | customer 1 1 1 1
Europe        
Segment analysis        
Revenue $ 555 $ 533 $ 1,041 $ 1,032
Adjusted EBITDA 64 61 113 117
Americas        
Segment analysis        
Revenue 700 770 1,345 1,408
Adjusted EBITDA $ 87 $ 120 $ 168 $ 209