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Employee benefits (Details 13)
$ in Millions
Dec. 31, 2024
USD ($)
Overfunded Pension Plans [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments $ 222
Overfunded Pension Plans [Member] | Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 224
Overfunded Pension Plans [Member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 226
Overfunded Pension Plans [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 228
Overfunded Pension Plans [Member] | Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 229
Overfunded Pension Plans [Member] | Later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 1,136
Underfunded Pension Plans And Other Benefits [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 46
Underfunded Pension Plans And Other Benefits [Member] | Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 48
Underfunded Pension Plans And Other Benefits [Member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 49
Underfunded Pension Plans And Other Benefits [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 50
Underfunded Pension Plans And Other Benefits [Member] | Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 51
Underfunded Pension Plans And Other Benefits [Member] | Later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments $ 275