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Financial and capital risk management - Sensitiity analysis other derivatives (Details) $ in Millions	Dec. 31, 2022 USD ($)
Fixed Price Sales Protection Forwards [Member] | Risk Nickel Price Increase [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	$ 7
Fixed Price Sales Protection Forwards [Member] | Risk Nickel Price Increase [Member] | Scenario I
IfrsStatementLineItems [Line Items]
Fair value of liabilities	1
Fixed Price Sales Protection Forwards [Member] | Risk Nickel Price Increase [Member] | Sensitivity Scenario Ii [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	(5)
Protected Item Part Of Nickel Revenues With Fixed Prices [Member] | Risk Nickel Price Increase [Member] | Scenario I
IfrsStatementLineItems [Line Items]
Fair value of liabilities	(1)
Protected Item Part Of Nickel Revenues With Fixed Prices [Member] | Risk Nickel Price Increase [Member] | Sensitivity Scenario Ii [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	5
Hedge Program For Products Acquisition For Resale Forwards [Member] | Risk Nickel Price Increase [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	(1)
Hedge Program For Products Acquisition For Resale Forwards [Member] | Risk Nickel Price Increase [Member] | Scenario I
IfrsStatementLineItems [Line Items]
Fair value of liabilities	3
Hedge Program For Products Acquisition For Resale Forwards [Member] | Risk Nickel Price Increase [Member] | Sensitivity Scenario Ii [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	(6)
Hedge Program For Products Acquisition For Resale Protected Item [Member] | Risk Nickel Price Increase [Member] | Scenario I
IfrsStatementLineItems [Line Items]
Fair value of liabilities	(3)
Hedge Program For Products Acquisition For Resale Protected Item [Member] | Risk Nickel Price Increase [Member] | Sensitivity Scenario Ii [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	6
Embedded Derivatives Gas Purchase [Member] | Risk Pellet Price Increase [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	(5)
Embedded Derivatives Gas Purchase [Member] | Risk Pellet Price Increase [Member] | Scenario I
IfrsStatementLineItems [Line Items]
Fair value of liabilities	(12)
Embedded Derivatives Gas Purchase [Member] | Risk Pellet Price Increase [Member] | Sensitivity Scenario Ii [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	$ (22)

X

- 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
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-IssueDate 2022-03-24
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-URIDate 2022-03-24

+ Details

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- References

No definition available.

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