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Employee benefits (Details 5) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Current provisions for employee benefits $ (964) $ (930)
Non-current provisions for employee benefits (1,381) (1,260)
Overfunded Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 1,114 919
Interest income 103 84
Changes on asset ceiling (192) 65
Translation adjustment 73 46
Benefit obligation (Plan assets) as at ending of the year 1,071 1,114
Net defined benefit liability (asset) 68 84
Transfer (27)  
Non-current provisions for employee benefits 68 84
Provisions for employee benefits 68 84
Overfunded Pension Plans [Member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Interest income 322 325
Translation adjustment 246 5
Transfer (1,201) 3,252
Overfunded Pension Plans [Member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Interest income 429 412
Translation adjustment 320 44
Net defined benefit liability (asset) 5,656 6,340
Transfer (1,261) 3,373
Overfunded Pension Plans [Member] | Effect of asset ceiling [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (1,071) (1,114)
Overfunded Pension Plans [Member] | Present Value Of Defined Benefit Obligations [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (4,517) (5,142)
Overfunded Pension Plans [Member] | Country of domicile [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 924 876
Interest income 95 83
Changes on asset ceiling (194) (89)
Translation adjustment 68 54
Benefit obligation (Plan assets) as at ending of the year 893 924
Overfunded Pension Plans [Member] | Country of domicile [member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (3,152) (2,634)
Overfunded Pension Plans [Member] | Country of domicile [member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) 4,045 3,558
Overfunded Pension Plans [Member] | Country of domicile [member] | Effect of asset ceiling [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (893) (924)
Overfunded Pension Plans [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 190 44
Interest income 8 1
Changes on asset ceiling 2 160
Translation adjustment 5 (15)
Benefit obligation (Plan assets) as at ending of the year 178 190
Net defined benefit liability (asset) 68 84
Transfer (27)  
Non-current provisions for employee benefits 68 84
Provisions for employee benefits 68 84
Overfunded Pension Plans [Member] | Foreign countries [member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (1,365) (2,508)
Overfunded Pension Plans [Member] | Foreign countries [member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) 1,611 2,782
Overfunded Pension Plans [Member] | Foreign countries [member] | Effect of asset ceiling [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (178) (190)
Underfunded Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Interest income 1  
Changes on asset ceiling (28)  
Net defined benefit liability (asset) (303) (269)
Current provisions for employee benefits (9) (10)
Transfer 27  
Non-current provisions for employee benefits (294) (259)
Provisions for employee benefits (303) (269)
Underfunded Pension Plans [Member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Interest income 103 39
Translation adjustment 41 (5)
Transfer 1,201 (3,252)
Underfunded Pension Plans [Member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Interest income 85 17
Translation adjustment 28 (9)
Net defined benefit liability (asset) 815 339
Transfer 1,261 (3,373)
Underfunded Pension Plans [Member] | Present Value Of Defined Benefit Obligations [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (1,118) (608)
Underfunded Pension Plans [Member] | Country of domicile [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (178) (145)
Current provisions for employee benefits (3) (3)
Non-current provisions for employee benefits (175) (142)
Provisions for employee benefits (178) (145)
Underfunded Pension Plans [Member] | Country of domicile [member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (272) (246)
Underfunded Pension Plans [Member] | Country of domicile [member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) 94 101
Underfunded Pension Plans [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Interest income 1  
Changes on asset ceiling (28)  
Net defined benefit liability (asset) (125) (124)
Current provisions for employee benefits (6) (7)
Transfer 27  
Non-current provisions for employee benefits (119) (117)
Provisions for employee benefits (125) (124)
Underfunded Pension Plans [Member] | Foreign countries [member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (846) (362)
Underfunded Pension Plans [Member] | Foreign countries [member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) 721 238
Other Benefits [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (1,148) (1,057)
Current provisions for employee benefits (61) (56)
Non-current provisions for employee benefits (1,087) (1,001)
Provisions for employee benefits (1,148) (1,057)
Other Benefits [Member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Interest income 68 60
Translation adjustment 43 (24)
Other Benefits [Member] | Present Value Of Defined Benefit Obligations [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (1,148) (1,057)
Other Benefits [Member] | Country of domicile [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (389) (321)
Current provisions for employee benefits (22) (16)
Non-current provisions for employee benefits (367) (305)
Provisions for employee benefits (389) (321)
Other Benefits [Member] | Country of domicile [member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (389) (321)
Other Benefits [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (759) (736)
Current provisions for employee benefits (39) (40)
Non-current provisions for employee benefits (720) (696)
Provisions for employee benefits (759) (736)
Other Benefits [Member] | Foreign countries [member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) $ (759) $ (736)