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Basis of preparation - Additional Information (Details) tonnes in Millions, $ in Billions	6 Months Ended
	Jun. 30, 2021 USD ($) tonnes
Basis Of Presentation [Abstract]
Credit derivative, nominal amount | $	$ 7.3
Short and long term legacy alumina sales contracts | tonnes	2.1
Percentage of volume commitments	30.00%
Percentage of opportunity loss	10.00%

X

- Definition

The nominal amount of a credit derivative. [Refer: Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 24G
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24G_a&doctype=Standard
-URIDate 2020-01-01

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- Definition

Basis of Presentation.

+ References

No definition available.

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- Definition

Legacy Alumina Sales Contracts, Opportunity Loss, Percent

+ References

No definition available.

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- Definition

Legacy Alumina Sales Contracts, Volume Commitments, Expiring By End Of Year Two, Percent

+ References

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- Definition

Short And Long Term Legacy Alumina Sales Contracts

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