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Employee benefits - Expected benefit payments (Details)
$ in Millions
Dec. 31, 2022
USD ($)
Overfunded Pension Plans [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments $ 248
Overfunded Pension Plans [Member] | Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 252
Overfunded Pension Plans [Member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 256
Overfunded Pension Plans [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 259
Overfunded Pension Plans [Member] | Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 261
Overfunded Pension Plans [Member] | Later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 1,326
Underfunded Pension Plans [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 31
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 30
Underfunded Pension Plans [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 29
Underfunded Pension Plans [Member] | Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 29
Underfunded Pension Plans [Member] | Later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 138
Other Benefits [Member] | Not later than one year [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 22
Other Benefits [Member] | Later than one year and not later than two years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 24
Other Benefits [Member] | Later than two years and not later than three years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 24
Other Benefits [Member] | Later than three years and not later than four years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 26
Other Benefits [Member] | Later than four years and not later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments 27
Other Benefits [Member] | Later than five years [member]  
IfrsStatementLineItems [Line Items]  
Expected benefit payments $ 153