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Risk management (Details 7)
$ in Millions
 6 Months Ended
Jun. 30, 2023
USD ($)
Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Expected realization $ (4,017)
Later Than Five Years And Not Later Than Six Years [Member]  
IfrsStatementLineItems [Line Items]  
Expected realization (6,516)
Later Than Six Years And Not Later Than Seven Years [Member]  
IfrsStatementLineItems [Line Items]  
Expected realization (3,572)
Later Than Seven Years And Not Later Than Eight Years [Member]  
IfrsStatementLineItems [Line Items]  
Expected realization (2,549)
Later Than Eight Years And Not Later Than Nine Years [Member]  
IfrsStatementLineItems [Line Items]  
Expected realization (3,190)
Later Than Nine Years [Member]  
IfrsStatementLineItems [Line Items]  
Expected realization (1,681)
Later than one year [member]  
IfrsStatementLineItems [Line Items]  
Expected realization 2,101
Average [Member]  
IfrsStatementLineItems [Line Items]  
Expected realization $ (19,424)