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Financial instruments and risk management - Summary of effect of the cash flow hedge in statement of profit or loss and other comprehensive income (OCI) (Detail) - Cash flow hedge reserve [member] - Highly Probable Forecast Aluminum Sales $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Disclosure Of Financial Instruments [Line Items] |
Total hedging gain recognised in OCI US$m | $ 181
Ineffectiveness recognised in profit or loss US$m | 24
Amount reclassified from OCI to profit or loss US$m | $ 2
Net operating costs [Member] |
Disclosure Of Financial Instruments [Line Items] |
Line item in the statement of profit or loss | Net operating costs (raw materials, consumables, repairs and maintenance)
Consolidated sales revenue [Member] |
Disclosure Of Financial Instruments [Line Items] |
Line item in the statement of profit or loss | Consolidated sales revenue

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- Definition The amount recognised in other comprehensive income on reclassification from profit or loss when applying the overlay approach, net of tax. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective on first application of IFRS 9 -Name IFRS -Number 4 -IssueDate 2017-01-01 -Paragraph 35D -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=4&date=2017-03-01&anchor=para_35D_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gain (loss) recognised in other comprehensive income on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24C_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24C_a_i&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24C_b_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Hedging instrument affecting statement of profit or loss. + References No definition available. + Details
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- Details
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- Details
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- Details
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