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Other financial assets - Schedule of Other Financial Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial assets [line items]    
Other financial assets $ 214 $ 219
Analysed as:    
Current 3 7
Non-current 211 212
Equity securities    
Disclosure of financial assets [line items]    
Other financial assets 93 97
Restricted funds    
Disclosure of financial assets [line items]    
Other financial assets 36 43
Cash | Restricted funds    
Disclosure of financial assets [line items]    
Other financial assets 0 1
Money market funds | Restricted funds    
Disclosure of financial assets [line items]    
Other financial assets 7 10
Accounts pledged as security | Restricted funds    
Disclosure of financial assets [line items]    
Other financial assets 27 31
Other | Restricted funds    
Disclosure of financial assets [line items]    
Other financial assets 2 1
Trade deposits and loans    
Disclosure of financial assets [line items]    
Other financial assets $ 85 $ 79