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Significant events in the current year - Coronavirus impact (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Derivative financial instruments. |  |  |
Amount pledged and expensed to support COVID-19 relief efforts |  |  | $ 109
Income tax rate | 20.00% | 22.00% | 34.00%
Recognized income tax gain |  |  | $ 80
Discontinued the nickel hedge program |  |  |
Derivative financial instruments. |  |  |
Cash consideration of the sale of contract options |  |  | $ 230
Indonesia |  |  |
Derivative financial instruments. |  |  |
Income tax rate |  |  | 25.00%

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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to changes in the tax rate. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2020-01-01 + Details
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