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Employee benefits (Details 7) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]      
Others comprehensive income $ 2,509 $ (3,508) $ (5,248)
Overfunded Pension Plans [Member]      
IfrsStatementLineItems [Line Items]      
Balance at beginning of the year (124) (93) (101)
Effect of changes actuarial assumptions (468) 784 330
Return on plan assets (excluding interest income) 286 (752) (269)
Change of asset ceiling 192 (65) (60)
Others (3) (5)
 Total 10 (36) (4)
Deferred income tax (3) 12 5
Others comprehensive income 7 (24) 1
Translation adjustments (10) (7) 7
Accumulated other comprehensive income (127) (124) (93)
Underfunded Pension Plans [Member]      
IfrsStatementLineItems [Line Items]      
Balance at beginning of the year (45) (92) (400)
Effect of changes actuarial assumptions (130) 109 246
Return on plan assets (excluding interest income) 44 (31) 181
Change of asset ceiling 28
Others 3
 Total (58) 78 430
Deferred income tax 19 (26) (130)
Others comprehensive income (39) 52 300
Translation adjustments (6) (5) 8
Accumulated other comprehensive income (90) (45) (92)
Other Benefits [Member]      
IfrsStatementLineItems [Line Items]      
Balance at beginning of the year 62 (172) (363)
Effect of changes actuarial assumptions (44) 343 261
Return on plan assets (excluding interest income)
Change of asset ceiling
Others (12) (4)
 Total (56) 343 257
Deferred income tax 20 (102) (83)
Others comprehensive income (36) 241 174
Translation adjustments (9) (7) 17
Accumulated other comprehensive income $ 17 $ 62 $ (172)