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Employee benefits - Evolution of assets fair value (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
Translation adjustment 46 [1] (63)
Benefit obligation (Plan assets) as at end of the year [1] 1,114 919
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
Employer contributions 45 29
Benefits paid (534) (235)
Return on plan assets (excluding interest income) (752) (269)
Translation adjustment 44 (276)
Transfers 3,373 281
Benefit obligation (Plan assets) as at end of the year 6,340 3,752
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
Employer contributions 14 40
Benefits paid (58) (257)
Return on plan assets (excluding interest income) (31) 181
Translation adjustment (9) 2
Transfers (3,373) (281)
Benefit obligation (Plan assets) as at end of the year 339 3,779
Other Benefits [Member] | Plan assets [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year
Employer contributions 57 56
Benefits paid (57) (56)
Benefit obligation (Plan assets) as at end of the year
[1] The pension plan asset is recorded as “Other non-current assets” in the balance sheet.