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Basis of preparation - Additional Information (Details) tonnes in Millions, $ in Billions | 6 Months Ended
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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%

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- 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 + Details
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- Definition Legacy Alumina Sales Contracts, Opportunity Loss, Percent + References No definition available. + Details
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- Definition Short And Long Term Legacy Alumina Sales Contracts + References No definition available. + Details
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