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Risk management - Non derivative hedging instrument (Details) - Cash flow hedging - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Risk management      
Hedging instrument at the end of the period $ 6,265 $ 5,572 $ 4,972
Reassignment of hedging instruments 970 1,879  
Realization of exports (970) (1,879)  
Designation of new coverage $ 693 $ 600