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Employee benefits (Details 4) - Medical Benefits [Member]
$ in Millions
 6 Months Ended
Jun. 30, 2024
USD ($)
Actuarial assumption of discount rates [member] | Increase In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation $ (896)
Current Service cost and interest cost (25)
Actuarial assumption of discount rates [member] | Decrease In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation 1,092
Current Service cost and interest cost 30
Actuarial assumption of medical cost trend rates [member] | Increase In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation 1,215
Current Service cost and interest cost 87
Actuarial assumption of medical cost trend rates [member] | Decrease In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation (1,003)
Current Service cost and interest cost $ (71)