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Employee benefits (Details 15)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Actuarial assumption of discount rates [member] | Pension Benefits [Member] | Increase In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation $ (1,804)
Current Service cost and interest cost (31)
Actuarial assumption of discount rates [member] | Pension Benefits [Member] | Decrease In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation 2,357
Current Service cost and interest cost 73
Actuarial assumption of discount rates [member] | Medical Benefits [Member] | Increase In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation (1,102)
Current Service cost and interest cost (67)
Actuarial assumption of discount rates [member] | Medical Benefits [Member] | Decrease In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation 1,364
Current Service cost and interest cost 82
Actuarial assumption of medical cost trend rates [member] | Medical Benefits [Member] | Increase In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation 1,388
Current Service cost and interest cost 198
Actuarial assumption of medical cost trend rates [member] | Medical Benefits [Member] | Decrease In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation (1,133)
Current Service cost and interest cost $ (157)