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Intangible assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Feb. 28, 2023
Disclosure of detailed information about intangible assets      
Beginning balance $ 1,382,000,000 $ 1,473,000,000  
Additions 24,000,000 15,000,000  
Acquisitions   6,000,000  
Charge for the year (140,000,000) (143,000,000)  
Exchange (43,000,000) 31,000,000  
Ending balance 1,223,000,000 1,382,000,000  
NOMOQ AG [Member]      
Disclosure of detailed information about intangible assets      
Goodwill     $ 4,000,000
Cost      
Disclosure of detailed information about intangible assets      
Beginning balance 2,473,000,000    
Ending balance 2,413,000,000 2,473,000,000  
Amortization      
Disclosure of detailed information about intangible assets      
Beginning balance (1,091,000,000)    
Ending balance (1,190,000,000) (1,091,000,000)  
Goodwill      
Disclosure of detailed information about intangible assets      
Beginning balance 999,000,000 976,000,000  
Acquisitions   4,000,000  
Exchange (33,000,000) 19,000,000  
Ending balance 966,000,000 999,000,000  
Goodwill | Cost      
Disclosure of detailed information about intangible assets      
Beginning balance 999,000,000    
Ending balance 966,000,000 999,000,000  
Customer relationships      
Disclosure of detailed information about intangible assets      
Beginning balance 352,000,000 476,000,000  
Charge for the year (129,000,000) (134,000,000)  
Exchange (8,000,000) 10,000,000  
Ending balance 215,000,000 352,000,000  
Customer relationships | Cost      
Disclosure of detailed information about intangible assets      
Beginning balance 1,373,000,000    
Ending balance 1,328,000,000 1,373,000,000  
Customer relationships | Amortization      
Disclosure of detailed information about intangible assets      
Beginning balance (1,021,000,000)    
Ending balance (1,113,000,000) (1,021,000,000)  
Technology and other      
Disclosure of detailed information about intangible assets      
Beginning balance 10,000,000 8,000,000  
Additions 10,000,000 12,000,000  
Acquisitions   2,000,000  
Charge for the year (3,000,000) (2,000,000)  
Transfers   (10,000,000)  
Exchange (1,000,000)    
Ending balance 16,000,000 10,000,000  
Technology and other | Cost      
Disclosure of detailed information about intangible assets      
Beginning balance 50,000,000    
Ending balance 57,000,000 50,000,000  
Technology and other | Amortization      
Disclosure of detailed information about intangible assets      
Beginning balance (40,000,000)    
Ending balance (41,000,000) (40,000,000)  
Joint IT Assets      
Disclosure of detailed information about intangible assets      
Additions 4,000,000 5,000,000  
Software      
Disclosure of detailed information about intangible assets      
Beginning balance 21,000,000 13,000,000  
Additions 14,000,000 3,000,000  
Charge for the year (8,000,000) (7,000,000)  
Transfers   10,000,000  
Exchange (1,000,000) 2,000,000  
Ending balance 26,000,000 21,000,000  
Software | Cost      
Disclosure of detailed information about intangible assets      
Beginning balance 51,000,000    
Ending balance 62,000,000 51,000,000  
Software | Amortization      
Disclosure of detailed information about intangible assets      
Beginning balance (30,000,000)    
Ending balance $ (36,000,000) $ (30,000,000)