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Exceptional items - Additional information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Exceptional items        
Impairment - property, plant and equipment     $ 11  
Foreign exchange gain (loss) $ (2) $ (3) (4) $ (4)
Net finance income (23) 40 (46) 63
Exceptional income tax (credit)/charge (2) 12 (11) 19
Exceptional items.        
Exceptional items        
Exceptional items before tax     6 (87)
Impairment - property, plant and equipment 11   11  
Restructuring costs 15   15  
Exceptional operating items, after tax 12 (58)   (93)
Start-up related and other costs 11 16 21 30
Transaction related and other costs 3 4 12 8
Gain on movement in fair market values     53 146
Net finance income 26 74 53 125
Exceptional income tax (credit)/charge $ (2) $ (4) (6) (6)
Legal settlement     6  
Professional fees     6  
Income tax benefit     6 6
Exceptional items. | Promissory Note        
Exceptional items        
Foreign exchange gain (loss)       (21)
Americas | Exceptional items.        
Exceptional items        
Start-up related and other costs     14 14
Europe | Exceptional items.        
Exceptional items        
Impairment - property, plant and equipment     11  
Restructuring costs     15  
Start-up related and other costs     $ 7 $ 16