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Financial and capital risk management (Details 3) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
IfrsStatementLineItems [Line Items] |  |
Derivatives settlement cash outflow | $ 124 | $ 172
Not Designated As Hedging Instruments [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Derivatives settlement cash outflow | 115 | 130
Not Designated As Hedging Instruments [Member] | Commodity price risk [member] |  |
IfrsStatementLineItems [Line Items] |  |
Derivatives settlement cash outflow | 9 | 8
Not Designated As Hedging Instruments [Member] | CDI & TJLP vs. US$ Fixed and Floating Rate Swap [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Derivatives settlement cash outflow | 1 | (8)
Not Designated As Hedging Instruments [Member] | Ipca Swap [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Derivatives settlement cash outflow | (4) | 3
Not Designated As Hedging Instruments [Member] | Dollar Swap [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Derivatives settlement cash outflow | 117 | 118
Not Designated As Hedging Instruments [Member] | Libor Swap [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Derivatives settlement cash outflow |  | 4
Not Designated As Hedging Instruments [Member] | SOFR Swap [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Derivatives settlement cash outflow | 4 |
Not Designated As Hedging Instruments [Member] | Treasury Forwards [Member] | Foreign Exchange And Interest Rate Risk [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Derivatives settlement cash outflow | (3) | 13
Not Designated As Hedging Instruments [Member] | Bunker Oil Gasoil And Brent [Member] | Commodity price risk [member] |  |
IfrsStatementLineItems [Line Items] |  |
Derivatives settlement cash outflow | 12 | 3
Not Designated As Hedging Instruments [Member] | Energy Transition Materials [Member] | Commodity price risk [member] |  |
IfrsStatementLineItems [Line Items] |  |
Derivatives settlement cash outflow | (3) | 5
Designated As Hedging Instruments [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Derivatives settlement cash outflow |  | 34
Designated As Hedging Instruments [Member] | Commodity Contract For Nickel [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Derivatives settlement cash outflow |  | $ 34

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