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Employee benefits - Costs recognized in the statement of comprehensive income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Others comprehensive income $ (3,508) $ (5,248) $ (5,492)
Overfunded Pension Plans [Member]      
IfrsStatementLineItems [Line Items]      
Balance at beginning of the year (93) (101) (173)
Effect of changes actuarial assumptions 784 330 (118)
Return on plan assets (excluding interest income) (752) (269) (114)
Change of asset ceiling (65) (60) 278
Other (3) (5)
 Total (36) (4) 46
Deferred income tax 12 5 (15)
Others comprehensive income (24) 1 31
Translation adjustments (7) 7 41
Accumulated other comprehensive income (124) (93) (101)
Underfunded Pension Plans [Member]      
IfrsStatementLineItems [Line Items]      
Balance at beginning of the year (92) (400) (459)
Effect of changes actuarial assumptions 109 246 (271)
Return on plan assets (excluding interest income) (31) 181 305
Change of asset ceiling
Other 3 9
 Total 78 430 43
Deferred income tax (26) (130) (12)
Others comprehensive income 52 300 31
Translation adjustments (5) 8 28
Accumulated other comprehensive income (45) (92) (400)
Other Benefits [Member]      
IfrsStatementLineItems [Line Items]      
Balance at beginning of the year (172) (363) (238)
Effect of changes actuarial assumptions 343 261 (243)
Return on plan assets (excluding interest income)
Change of asset ceiling
Other (4) 11
 Total 343 257 (232)
Deferred income tax (102) (83) 82
Others comprehensive income 241 174 (150)
Translation adjustments (7) 17 25
Accumulated other comprehensive income $ 62 $ (172) $ (363)