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Employee benefits (Details 13)
$ in Millions
Dec. 31, 2023
USD ($)
Overfunded Pension Plans [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments $ 275
Overfunded Pension Plans [Member] | Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 277
Overfunded Pension Plans [Member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 279
Overfunded Pension Plans [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 280
Overfunded Pension Plans [Member] | Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 281
Overfunded Pension Plans [Member] | Later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 1,387
Underfunded Pension Plans [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 30
Underfunded Pension Plans [Member] | Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 30
Underfunded Pension Plans [Member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 31
Underfunded Pension Plans [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 31
Underfunded Pension Plans [Member] | Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 31
Underfunded Pension Plans [Member] | Later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 161
Other Benefits [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 26
Other Benefits [Member] | Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 27
Other Benefits [Member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 28
Other Benefits [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 30
Other Benefits [Member] | Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 30
Other Benefits [Member] | Later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments $ 167