Financial and capital risk management (Details 6) $ in Millions	Dec. 31, 2025 USD ($) bbl	Dec. 31, 2024 USD ($) bbl
Bunker Oil Options [Member]
IfrsStatementLineItems [Line Items]
Notional amount per barrel \| bbl	22,224,999	24,050,625
Fair value of liabilities	$ (5)	$ 11
Bunker Oil Options [Member] \| Not later than one year [member]
IfrsStatementLineItems [Line Items]
Value at risk	(5)
Bunker Oil Forwards Contract [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	$ 15	$ (11)
Nominal amount of hedging instrument	2,070	3,240
Bunker Oil Forwards Contract [Member] \| Not later than one year [member]
IfrsStatementLineItems [Line Items]
Value at risk	$ 15
Nickel Forwards Sold [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	$ 5	$ (7)
Nominal amount of hedging instrument	3,557	4,978
Nickel Forwards Sold [Member] \| Not later than one year [member]
IfrsStatementLineItems [Line Items]
Value at risk	$ 5
Cobalt Forwards [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	$ 1
Nominal amount of hedging instrument	26
Cobalt Forwards [Member] \| Not later than one year [member]
IfrsStatementLineItems [Line Items]
Value at risk	$ 1

The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The nominal amount of a hedging instrument. [Refer: Hedging instruments [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2024-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 41
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_41&doctype=Standard
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- References

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- References

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- References

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- Details

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