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Employee benefits (Details 14)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Actuarial assumption of discount rates [member] | Pension Benefits [Member] | Increase In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation $ (1,474)
Current Service cost and interest cost (24)
Actuarial assumption of discount rates [member] | Pension Benefits [Member] | Decrease In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation 1,882
Current Service cost and interest cost 47
Actuarial assumption of discount rates [member] | Medical Benefits [Member] | Increase In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation (602)
Current Service cost and interest cost (46)
Actuarial assumption of discount rates [member] | Medical Benefits [Member] | Decrease In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation 735
Current Service cost and interest cost 56
Actuarial assumption of medical cost trend rates [member] | Medical Benefits [Member] | Increase In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation 772
Current Service cost and interest cost 128
Actuarial assumption of medical cost trend rates [member] | Medical Benefits [Member] | Decrease In Basis Points [Member]  
IfrsStatementLineItems [Line Items]  
Pension Obligation (176)
Current Service cost and interest cost $ (26)