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Financial risk management (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Fair value Asset Position (Liability)    
Open derivatives transactions $ (79) $ 20
Closed derivatives transactions awaiting financial settlement 6 10
Recognized in Statements of Financial Position (73) 30
Other assets (note 16) 76 92
Other liabilities  (note 16) $ (149) $ (62)