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Financial and capital risk management (Details 3) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
IfrsStatementLineItems [Line Items] |  |  |
Derivatives settlement cash outflow | $ 567 | $ (83) | $ (197)
Not Designated As Hedging Instruments [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Derivatives settlement cash outflow | 476 | 160 | (270)
Not Designated As Hedging Instruments [Member] | Commodity price risk [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Derivatives settlement cash outflow | 6 | 19 | 205
Not Designated As Hedging Instruments [Member] | Cdi Tjlp Versus Usd Fixed And Floating Rate Swap [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Derivatives settlement cash outflow | (1) | (98) | (142)
Not Designated As Hedging Instruments [Member] | Ipca Swap [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Derivatives settlement cash outflow | 1 | 56 | (18)
Not Designated As Hedging Instruments [Member] | Eurobonds Swap [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Derivatives settlement cash outflow |  |  | (29)
Not Designated As Hedging Instruments [Member] | Dollar Swap [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Derivatives settlement cash outflow | 454 | 164 | (79)
Not Designated As Hedging Instruments [Member] | Libor Swap [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Derivatives settlement cash outflow | 8 | 46 | (2)
Not Designated As Hedging Instruments [Member] | Treasury Hedge Forward [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Derivatives settlement cash outflow | 14 | (8) |
Not Designated As Hedging Instruments [Member] | Bunker Oil Gasoil And Brent [Member] | Commodity price risk [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Derivatives settlement cash outflow | 7 | 9 | 205
Not Designated As Hedging Instruments [Member] | Energy Transition Materials [Member] | Commodity price risk [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Derivatives settlement cash outflow | (1) | 10 |
Designated As Hedging Instruments [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Derivatives settlement cash outflow | 85 | (262) | (132)
Designated As Hedging Instruments [Member] | Commodity Contract For Nickel [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Derivatives settlement cash outflow | 85 | (277) | (67)
Designated As Hedging Instruments [Member] | Palladium [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Derivatives settlement cash outflow |  | 15 | 5
Designated As Hedging Instruments [Member] | Coal [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Derivatives settlement cash outflow |  |  | $ (70)

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