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Financial risk management (Details 2) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Fair value Asset Position (Liability)    
Open derivatives transactions $ (22) $ (101)
Closed derivatives transactions awaiting financial settlement 1 1
Recognized in Statements of Financial Position (21) (100)
Other assets (note 16) 73 29
Other liabilities (note 16) $ (94) $ (129)