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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)

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