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Segment analysis (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
segment
Jun. 30, 2022
USD ($)
Segment analysis        
Number of operating segments. | segment     2  
Number of reportable segments | segment     2  
(Loss)/profit for the period $ (10) $ 100 $ (11) $ 157
Income tax (credit)/charge (2) 12 (11) 19
Net finance expense/(income) 23 (40) 46 (63)
Depreciation and amortization 100 89 198 175
Exceptional operating items 40 20 59 38
Adjusted EBITDA $ 151 $ 181 $ 281 $ 326