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Employee benefits (Details 5) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Current provisions for employee benefits $ (1,012) $ (964)
Non-current provisions for employee benefits (1,118) (1,381)
Overfunded Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 1,071 1,114
Interest income 69 103
Changes on asset ceiling (76) (192)
Translation adjustment (204) 73
Benefit obligation (Plan assets) as at ending of the year 860 1,071
Net defined benefit liability (asset) 110 68
Transfer   (27)
Non-current provisions for employee benefits 110 68
Provisions for employee benefits 110 68
Overfunded Pension Plans [Member] | Present Value Of Actuarial Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (3,346) (4,517)
Overfunded Pension Plans [Member] | Fair Value Of Assets [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) 4,316 5,656
Overfunded Pension Plans [Member] | Effect of asset ceiling [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (860) (1,071)
Overfunded Pension Plans [Member] | Country of domicile [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 893 924
Interest income 61 95
Changes on asset ceiling (109) (194)
Translation adjustment (196) 68
Benefit obligation (Plan assets) as at ending of the year 649 893
Overfunded Pension Plans [Member] | Country of domicile [member] | Present Value Of Actuarial Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (2,113) (3,152)
Overfunded Pension Plans [Member] | Country of domicile [member] | Fair Value Of Assets [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) 2,762 4,045
Overfunded Pension Plans [Member] | Country of domicile [member] | Effect of asset ceiling [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (649) (893)
Overfunded Pension Plans [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 178 190
Interest income 8 8
Changes on asset ceiling 33 2
Translation adjustment (8) 5
Benefit obligation (Plan assets) as at ending of the year 211 178
Net defined benefit liability (asset) 110 68
Transfer   (27)
Non-current provisions for employee benefits 110 68
Provisions for employee benefits 110 68
Overfunded Pension Plans [Member] | Foreign countries [member] | Present Value Of Actuarial Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (1,233) (1,365)
Overfunded Pension Plans [Member] | Foreign countries [member] | Fair Value Of Assets [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) 1,554 1,611
Overfunded Pension Plans [Member] | Foreign countries [member] | Effect of asset ceiling [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (211) (178)
Underfunded Pension Plans And Other Benefits [Member]    
IfrsStatementLineItems [Line Items]    
Interest income   1
Changes on asset ceiling   (28)
Net defined benefit liability (asset) (1,180) (1,451)
Current provisions for employee benefits (62) (70)
Transfer   27
Non-current provisions for employee benefits (1,118) (1,381)
Provisions for employee benefits (1,180) (1,451)
Underfunded Pension Plans And Other Benefits [Member] | Present Value Of Actuarial Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (1,923) (2,266)
Underfunded Pension Plans And Other Benefits [Member] | Fair Value Of Assets [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) 743 815
Underfunded Pension Plans And Other Benefits [Member] | Country of domicile [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (378) (567)
Current provisions for employee benefits (22) (25)
Non-current provisions for employee benefits (356) (542)
Provisions for employee benefits (378) (567)
Underfunded Pension Plans And Other Benefits [Member] | Country of domicile [member] | Present Value Of Actuarial Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (438) (661)
Underfunded Pension Plans And Other Benefits [Member] | Country of domicile [member] | Fair Value Of Assets [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) 60 94
Underfunded Pension Plans And Other Benefits [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Interest income   1
Changes on asset ceiling   (28)
Net defined benefit liability (asset) (802) (884)
Current provisions for employee benefits (40) (45)
Transfer   27
Non-current provisions for employee benefits (762) (839)
Provisions for employee benefits (802) (884)
Underfunded Pension Plans And Other Benefits [Member] | Foreign countries [member] | Present Value Of Actuarial Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (1,485) (1,605)
Underfunded Pension Plans And Other Benefits [Member] | Foreign countries [member] | Fair Value Of Assets [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) $ 683 $ 721