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Acquisitions and divestitures - Mineracoes Brasileiras Reunidas (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about business combination [line items] |  |  |  |
Acquisitions and disposal of noncontrolling interest |  | $ 242 | $ (1,007) | $ (229)
Mineracoes Brasileiras Reunidas S.A. (MBR) |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Percentage of voting equity interests acquired | 36.40% | 100.00% | 36.40% |
Cash transferred | $ 812 | $ 104 | $ 812 |
Ownership interest in subsidiary (as a percent) | 98.30% |  |  |
Acquisitions and disposal of noncontrolling interest | $ 343 |  |  |

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- Definition The increase (decrease) in equity through changes in ownership interests in subsidiaries that do not result in loss of control. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 106 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_106_d_iii&doctype=Standard -URIDate 2020-01-01 + Details
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