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Risk management (Details 7)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Expected realization $ (7,613)
Later Than Five Years And Not Later Than Six Years [Member]  
IfrsStatementLineItems [Line Items]  
Expected realization (5,692)
Later Than Six Years And Not Later Than Seven Years [Member]  
IfrsStatementLineItems [Line Items]  
Expected realization (3,558)
Later Than Seven Years And Not Later Than Eight Years [Member]  
IfrsStatementLineItems [Line Items]  
Expected realization (3,019)
Later Than Eight Years And Not Later Than Nine Years [Member]  
IfrsStatementLineItems [Line Items]  
Expected realization (3,258)
Later Than Nine Years [Member]  
IfrsStatementLineItems [Line Items]  
Expected realization (2,251)
Later than one year [member]  
IfrsStatementLineItems [Line Items]  
Expected realization (1,136)
Average [Member]  
IfrsStatementLineItems [Line Items]  
Expected realization $ (26,527)