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Capital structure and financing - C.2. Dividend distributions (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 10, 2025
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2024
Disclosure of classes of share capital [line items]        
Dividends paid, ordinary shares   $ 0 $ 0  
Statutory reserves unavailable for distribution   $ 491 $ 472 $ 562
Dividend distribution        
Disclosure of classes of share capital [line items]        
Dividends paid, ordinary shares per share (in US dollar per share) $ 1.00      
Dividends paid, ordinary shares $ 172