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Exceptional items (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  
Exceptional items - cost of sales $ 1,146 $ 1,139 2,164 $ 2,139
Exceptional items - SG&A expenses 63 57 128 117
Exceptional net finance income 23 (40) 46 (63)
Income tax (credit)/charge (2) 12 (11) 19
Exceptional items.        
Exceptional items        
Start-up related and other costs 11 16 21 30
Impairment - property, plant and equipment 11   11  
Restructuring costs 15   15  
Exceptional items - cost of sales 37 16 47 30
Transaction related and other costs 3 4 12 8
Exceptional items - SG&A expenses 3 4 12 8
Exceptional net finance income (26) (74) (53) (125)
Income tax (credit)/charge (2) (4) $ (6) (6)
Total exceptional items, net of tax $ 12 $ (58)   $ (93)