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Capital structure and financing - C.2. Dividend distributions (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Apr. 15, 2026
$ / shares
Jan. 15, 2026
$ / shares
Oct. 15, 2025
$ / shares
Aug. 06, 2025
installment
$ / shares
Jul. 15, 2025
$ / shares
May 21, 2025
installment
$ / shares
Apr. 15, 2025
$ / shares
Jan. 10, 2025
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Disclosure of classes of share capital [line items]                      
Dividends paid, ordinary shares per share (in US dollar per share)             $ 0.75 $ 1.00      
Dividends approved, ordinary shares per share (in US dollar per share)           $ 3.00          
Dividend payable, number of quarterly installments | installment           4          
Dividends payable, ordinary shares per share (in US dollar per share)     $ 0.75   $ 0.75            
Special interim dividends approved, ordinary shares per share (in US dollar per share)       $ 2.50              
Special interim dividend payable, number of quarterly installments | installment       2              
Special interim dividends payable, ordinary shares per share (in US dollar per share)     $ 1.25                
Dividends paid, ordinary shares | $               $ 172 $ 0    
Statutory reserves unavailable for distribution | $                 $ 491 $ 661 $ 562
Dividend distribution                      
Disclosure of classes of share capital [line items]                      
Dividends payable, ordinary shares per share (in US dollar per share)   $ 0.75                  
Forecast                      
Disclosure of classes of share capital [line items]                      
Dividends payable, ordinary shares per share (in US dollar per share) $ 0.75                    
Special interim dividends payable, ordinary shares per share (in US dollar per share) $ 1.25