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Provisions - Asset retirement obligations (Details) R$ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 BRL (R$) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Change in the provision for asset retirement obligations |  |  |
Balance at beginning of the period | R$ 1,916 | $ 3,960 |
Balance at end of the period | R$ 3,989 | 4,220 | $ 3,960
Asset retirement obligations |  |  |
Provisions, current liabilities |  | 1,826 | 1,230
Provisions, non-current liabilities |  | 8,434 | 8,493
Asset retirement obligations |  |  |
Change in the provision for asset retirement obligations |  |  |
Balance at beginning of the period |  | 3,960 | 3,115
Present value valuation |  | 27 | 37
Settlements |  | (45) | (47)
Revisions on cash flows estimates |  | 509 | 812
Translation adjustment |  | (231) | 43
Balance at end of the period |  | 4,220 | 3,960
Asset retirement obligations |  |  |
Provisions, current liabilities |  | 99 | 158
Provisions, non-current liabilities |  | $ 4,121 | $ 3,802

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- Definition The amount of additional other provisions made. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 84 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of current provisions. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_l&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of non-current provisions. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_l&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of provisions other than provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 84 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount used (ie incurred and charged against the provision) for other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 84 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount reversed for unused other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 84 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84_d&doctype=Standard -URIDate 2020-01-01 + Details
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