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Deferred tax - Tax credit recognised in Income statement (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred income tax      
Deferred tax assets $ 268,000,000 $ 283,000,000  
Credits / (Charged) to the income statement (1,000,000) 24,000,000 $ 15,000,000
Unused tax losses for which no deferred tax asset recognised 2,900,000,000 729,000,000 120,000,000
Deferred tax assets not recognised. 675,000,000 155,000,000 17,000,000
Provision for temporary difference in investment in subsidiary 0    
SWITZERLAND      
Deferred income tax      
Deferred tax assets 25,000,000    
Losses Which Do Not Expire [member]      
Deferred income tax      
Unused tax losses for which no deferred tax asset recognised 30,000,000    
Losses Which Expire Between 2029 And 2031 [member]      
Deferred income tax      
Unused tax losses for which no deferred tax asset recognised 64,000,000    
Losses Which Expire Between 2038 And 2041 [member]      
Deferred income tax      
Unused tax losses for which no deferred tax asset recognised 2,800,000,000    
Tax losses      
Deferred income tax      
Deferred tax assets 53,000,000 39,000,000  
Credits / (Charged) to the income statement 16,000,000 14,000,000 15,000,000
Employee benefit obligations      
Deferred income tax      
Deferred tax assets 19,000,000 23,000,000  
Credits / (Charged) to the income statement (1,000,000) 3,000,000 3,000,000
Depreciation timing differences (including leases)      
Deferred income tax      
Deferred tax assets 123,000,000 147,000,000  
Credits / (Charged) to the income statement (21,000,000) 26,000,000 38,000,000
Provisions      
Deferred income tax      
Deferred tax assets 29,000,000 29,000,000  
Credits / (Charged) to the income statement   (3,000,000) 8,000,000
Other deferred tax assets      
Deferred income tax      
Credits / (Charged) to the income statement   20,000,000 11,000,000
Intangible assets      
Deferred income tax      
Credits / (Charged) to the income statement 14,000,000 10,000,000 13,000,000
Accelerated depreciation and other fair value adjustments (including leases)      
Deferred income tax      
Credits / (Charged) to the income statement (8,000,000) (49,000,000) (68,000,000)
Other deferred tax liabilities      
Deferred income tax      
Credits / (Charged) to the income statement $ (1,000,000) $ 3,000,000 $ (5,000,000)