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Capital structure and financing - C.1. Share capital and other equity reserves (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
May 21, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Feb. 28, 2022
Disclosure of reserves within equity [line items]          
Number of shares authorised (in shares)   200,000,000 200,000,000   200,000,000
Subscribed and fully paid up share capital (in shares)   169,000,000 172,096,305    
Par value per share (usd per share)   $ 1.50 $ 1.50   $ 1.50
Share capital   $ 253 $ 258    
Share premium   1,036 1,064    
Share capital and premium   1,290 1,322    
Number of treasury shares cancelled (in shares) 3,096,305        
Other Reserves [Roll Forward]          
Other equity reserves, beginning balance   (531)      
Share based compensation [1]   14 50 $ 52  
Share based cancellation     (35)    
Issuance of shares with respect to LTIPs   0 1 1  
Remeasurements of post-employment benefit obligations   0 1 (2)  
Transfer to legal reserve [1]     0 0  
Cash flow hedge reserve movement   4 (4) (10)  
Currency translation movement   31 15 33  
Other equity reserves, ending balance   (689) (531)    
Legal reserve          
Other Reserves [Roll Forward]          
Other equity reserves, beginning balance   26 18 16  
Transfer to legal reserve     8 2  
Other equity reserves, ending balance   26 26 18  
Equity settled transaction reserve          
Other Reserves [Roll Forward]          
Other equity reserves, beginning balance   24 61 51  
Share based compensation   14 49 50  
Share based cancellation     (35)    
Issuance of shares with respect to LTIPs   (29) (50) (40)  
Other equity reserves, ending balance   9 24 61  
Hedge reserve          
Other Reserves [Roll Forward]          
Other equity reserves, beginning balance   (4) (2) 5  
Cash flow hedge reserve movement   3 (2) (7)  
Other equity reserves, ending balance   (1) (4) (2)  
Currency translation reserve          
Other Reserves [Roll Forward]          
Other equity reserves, beginning balance   (573) (571) (626)  
Currency translation movement   (145) (2) 56  
Other equity reserves, ending balance   (718) (573) (571)  
Pension obligation reserve          
Other Reserves [Roll Forward]          
Other equity reserves, beginning balance   (5) (6) (4)  
Share based cancellation     0    
Remeasurements of post-employment benefit obligations     1 (2)  
Transfer to legal reserve       0  
Other equity reserves, ending balance   (5) (5) (6)  
Total          
Other Reserves [Roll Forward]          
Share based compensation [1]   14 49 50  
Share based cancellation     (35)    
Issuance of shares with respect to LTIPs     1 1  
Share premium          
Other Reserves [Roll Forward]          
Issuance of shares with respect to LTIPs [1]   (8) (12) (9)  
Other reserves          
Other Reserves [Roll Forward]          
Other equity reserves, beginning balance   (531) (500) (559)  
Share based compensation [1]   14 49 50  
Share based cancellation [1]     (35)    
Issuance of shares with respect to LTIPs [1]   (29) (50) (40)  
Remeasurements of post-employment benefit obligations     1 (2)  
Transfer to legal reserve [1]     8 2  
Cash flow hedge reserve movement   3 (2) (7)  
Currency translation movement   (145) (2) 56  
Other equity reserves, ending balance   $ (689) $ (531) $ (500)  
[1] Share capital, share premium (including the effects of rights offering) and other reserves (including share-based compensation) – see note C.1.