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Employee benefits (Details 13) $ in Millions	12 Months Ended
Employee benefits (Details 13) $ in Millions	Dec. 31, 2024 USD ($)
Actuarial assumption of discount rates [member] \| Pension Benefits [Member] \| Increase In Basis Points [Member]
IfrsStatementLineItems [Line Items]
Pension Obligation	$ (1,045)
Current Service cost and interest cost	(12)
Actuarial assumption of discount rates [member] \| Pension Benefits [Member] \| Decrease In Basis Points [Member]
IfrsStatementLineItems [Line Items]
Pension Obligation	1,169
Current Service cost and interest cost	6
Actuarial assumption of discount rates [member] \| Medical Benefits [Member] \| Increase In Basis Points [Member]
IfrsStatementLineItems [Line Items]
Pension Obligation	(722)
Current Service cost and interest cost	(51)
Actuarial assumption of discount rates [member] \| Medical Benefits [Member] \| Decrease In Basis Points [Member]
IfrsStatementLineItems [Line Items]
Pension Obligation	868
Current Service cost and interest cost	61
Actuarial assumption of medical cost trend rates [member] \| Medical Benefits [Member] \| Increase In Basis Points [Member]
IfrsStatementLineItems [Line Items]
Pension Obligation	911
Current Service cost and interest cost	150
Actuarial assumption of medical cost trend rates [member] \| Medical Benefits [Member] \| Decrease In Basis Points [Member]
IfrsStatementLineItems [Line Items]
Pension Obligation	(762)
Current Service cost and interest cost	$ (63)