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Financial and capital risk management - Net investment hedge (Details) bbl in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) bbl	Dec. 31, 2020 USD ($)
IfrsStatementLineItems [Line Items]
Financial settlement inflows outflows	$ (83)	$ (197)	$ (34)
Nickel Revenue Hedging Programs Forward Options Sold [Member]
IfrsStatementLineItems [Line Items]
Nominal amount of hedging instrument	6,300	39,575
Average strike per ton	34,929
Fair value of liabilities	$ 28	$ (26)
Financial settlement inflows outflows	(277)
Value at risk	11
Nickel Revenue Hedging Programs Forward Options Sold [Member] | Not later than one year [member]
IfrsStatementLineItems [Line Items]
Value at risk	28
Nickel Revenue Hedge Program [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities	28	(26)
Financial settlement inflows outflows	(277)
Value at risk	11
Nickel Revenue Hedge Program [Member] | Not later than one year [member]
IfrsStatementLineItems [Line Items]
Value at risk	28
Palladium Revenue Hedging Programs Call Options Sold [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities		$ (1)
Notional amount per barrel | bbl		44,228
Palladium Revenue Hedging Programs Put Options Bought [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities		$ 26
Financial settlement inflows outflows	15
Notional amount per barrel | bbl		44,228
Palladium Revenue Hedge Program [Member]
IfrsStatementLineItems [Line Items]
Fair value of liabilities		$ 25
Financial settlement inflows outflows	$ 15

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
-Name IAS
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-IssueDate 2022-03-24
-Paragraph 55
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-URIDate 2022-03-24

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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 2022-03-24
-Paragraph 23B
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_23B_a&doctype=Standard
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-URIDate 2022-03-24

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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
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-IssueDate 2022-03-24
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- References

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