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Cash used in operating activities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Cash used in operating activities        
(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
Movement in working capital 171 (70) (175) (395)
Exceptional costs paid, including restructuring (20) (20) (32) (34)
Cash used in operations $ 302 $ 91 $ 74 $ (103)