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Employee benefits - Reconciliation of net liabilities recognized in the statement of financial position (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Overfunded Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year $ 919 [1] $ 864
Interest income 84 [1] 58
Changes on asset ceiling 65 [1] 60
Translation adjustment 46 [1] (63)
Benefit obligation (Plan assets) as at end of the year [1] 1,114 919
Net defined benefit liability (asset) [1] 84  
Non-current provisions for employee benefits [1] 84  
Provisions for employee benefits [1] 84  
Overfunded Pension Plans [Member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 2,833 3,105
Interest income 325 196
Translation adjustment 5 (208)
Benefit obligation (Plan assets) as at end of the year 5,142 2,833
Overfunded Pension Plans [Member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 3,752 3,969
Interest income 412 253
Translation adjustment 44 (276)
Benefit obligation (Plan assets) as at end of the year 6,340 3,752
Net defined benefit liability (asset) 6,340 [1] 3,752
Overfunded Pension Plans [Member] | Effect of asset ceiling [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (1,114) [1] (919)
Overfunded Pension Plans [Member] | Present Value Of Defined Benefit Obligations [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (5,142) [1] (2,833)
Overfunded Pension Plans [Member] | Country of domicile [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 876 864
Interest income 83 58
Changes on asset ceiling (89) 16
Translation adjustment 54 (62)
Benefit obligation (Plan assets) as at end of the year 924 876
Overfunded Pension Plans [Member] | Country of domicile [member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (2,634) (2,572)
Overfunded Pension Plans [Member] | Country of domicile [member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) 3,558 3,448
Overfunded Pension Plans [Member] | Country of domicile [member] | Effect of asset ceiling [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (924) (876)
Overfunded Pension Plans [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 44
Interest income 1  
Changes on asset ceiling 160 44
Translation adjustment (15)  
Benefit obligation (Plan assets) as at end of the year 190 44
Net defined benefit liability (asset) 84  
Non-current provisions for employee benefits 84  
Provisions for employee benefits 84  
Overfunded Pension Plans [Member] | Foreign countries [member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (2,508) (261)
Overfunded Pension Plans [Member] | Foreign countries [member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) 2,782 305
Overfunded Pension Plans [Member] | Foreign countries [member] | Effect of asset ceiling [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (190) (44)
Underfunded Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (269) (204)
Current provisions for employee benefits (10) (47)
Non-current provisions for employee benefits (259) (157)
Provisions for employee benefits (269) (204)
Underfunded Pension Plans [Member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 3,983 4,632
Interest income 39 122
Translation adjustment (5) (10)
Benefit obligation (Plan assets) as at end of the year 608 3,983
Underfunded Pension Plans [Member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 3,779 3,992
Interest income 17 102
Translation adjustment (9) 2
Benefit obligation (Plan assets) as at end of the year 339 3,779
Net defined benefit liability (asset) 339 3,779
Underfunded Pension Plans [Member] | Present Value Of Defined Benefit Obligations [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (608) (3,983)
Underfunded Pension Plans [Member] | Country of domicile [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (145) (143)
Current provisions for employee benefits (3) (40)
Non-current provisions for employee benefits (142) (103)
Provisions for employee benefits (145) (143)
Underfunded Pension Plans [Member] | Country of domicile [member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (246) (237)
Underfunded Pension Plans [Member] | Country of domicile [member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) 101 94
Underfunded Pension Plans [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (124) (61)
Current provisions for employee benefits (7) (7)
Non-current provisions for employee benefits (117) (54)
Provisions for employee benefits (124) (61)
Underfunded Pension Plans [Member] | Foreign countries [member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (362) (3,746)
Underfunded Pension Plans [Member] | Foreign countries [member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) 238 3,685
Other Benefits [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (1,057) (1,428)
Current provisions for employee benefits (56) (52)
Non-current provisions for employee benefits (1,001) (1,376)
Provisions for employee benefits (1,057) (1,428)
Other Benefits [Member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 1,427 1,733
Interest income 60 33
Translation adjustment (24) (23)
Benefit obligation (Plan assets) as at end of the year 1,057 1,427
Other Benefits [Member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year
Benefit obligation (Plan assets) as at end of the year
Other Benefits [Member] | Present Value Of Defined Benefit Obligations [Member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (1,057) (1,428)
Other Benefits [Member] | Country of domicile [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (321) (301)
Current provisions for employee benefits (16) (5)
Non-current provisions for employee benefits (305) (296)
Provisions for employee benefits (321) (301)
Other Benefits [Member] | Country of domicile [member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (321) (301)
Other Benefits [Member] | Foreign countries [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) (736) (1,127)
Current provisions for employee benefits (40) (47)
Non-current provisions for employee benefits (696) (1,080)
Provisions for employee benefits (736) (1,127)
Other Benefits [Member] | Foreign countries [member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Net defined benefit liability (asset) $ (736) $ (1,127)
[1] The pension plan asset is recorded as “Other non-current assets” in the balance sheet.