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Risk management (Details 9)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Later than one year [member]  
IfrsStatementLineItems [Line Items]  
Expected realization $ (7,439)
Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Expected realization (4,145)
Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Expected realization (3,020)
Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Expected realization (3,714)
Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected realization (2,024)
Later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected realization 2,132
Average [Member]  
IfrsStatementLineItems [Line Items]  
Expected realization $ (18,210)