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Financial and capital risk management (Details 12) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
IfrsStatementLineItems [Line Items] |  |  |
Fair value of liabilities | $ 16 |  | $ (24)
Financial settlement inflows outflows | 124 | $ 172 |
Not later than one year [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Fair value of liabilities |  |  |
Later than one year [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Fair value of liabilities | $ 12 |  |
Fixed Price Sales Protection Nickel Forwards Bought [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Nominal amount of hedging instrument | 3,402 |  | 3,322
Average strike per ton | 18,579 |  |
Fair value of liabilities | $ (4) |  | $ (8)
Financial settlement inflows outflows | (3) |  |
Value at risk | 2 |  |
Fixed Price Sales Protection Nickel Forwards Bought [Member] | Not later than one year [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Value at risk | (3) |  |
Fixed Price Sales Protection Nickel Forwards Bought [Member] | Later than one year [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Value at risk | (1) |  |
Nickel Forwards [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Fair value of liabilities | (4) |  | $ (8)
Financial settlement inflows outflows | (3) |  |
Value at risk | 2 |  |
Nickel Forwards [Member] | Not later than one year [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Value at risk | (3) |  |
Nickel Forwards [Member] | Later than one year [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Value at risk | $ (1) |  |
Embedded Call Options Sold [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Nominal amount of hedging instrument | 746,667 |  | 746,667
Average strike per ton | 233 |  |
Fair value of liabilities | $ (1) |  | $ (2)
Value at risk | 1 |  |
Embedded Call Options Sold [Member] | Not later than one year [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Value at risk | (1) |  |
Call Options [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Fair value of liabilities | (1) |  | $ (2)
Value at risk | 1 |  |
Call Options [Member] | Not later than one year [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Value at risk | $ (1) |  |

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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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Period Type: | instant

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- Definition The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 23B -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_23B_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24A -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24A_d&doctype=Standard -URIDate 2023-03-23 + Details
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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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- References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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Period Type: |