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Risk management (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Fair value Asset Position (Liability)    
Open derivatives transactions $ 20 $ (120)
Closed derivatives transactions awaiting financial settlement 10 27
Recognized in Statements of Financial Position 30 (93)
Other assets (note 21) 92 54
Other liabilities  (note 21) $ (62) $ (147)