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Segment analysis - Segment Results (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
customer
Dec. 31, 2023
USD ($)
customer
Dec. 31, 2022
USD ($)
customer
Segment analysis      
Revenue $ 4,908 $ 4,812 $ 4,689
Adjusted EBITDA 672 600 625
Capital expenditure 179 378 595
Segment assets $ 5,462 $ 5,669 $ 5,865
Number of customers accounting for greater than 10% of revenue | customer 1 1 1
Europe      
Segment analysis      
Revenue $ 2,161 $ 2,030 $ 1,963
Adjusted EBITDA 257 211 200
Capital expenditure 76 155 213
Segment assets 2,589 2,648 2,754
Americas      
Segment analysis      
Revenue 2,747 2,782 2,726
Adjusted EBITDA 415 389 425
Capital expenditure 103 223 382
Segment assets $ 2,873 $ 3,021 $ 3,111