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Equity and Remuneration to Shareholders - Reserves - Schedule of Capital Reserves and Profit Reserves (Detail) - BRL (R$) R$ in Millions | Apr. 23, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Disclosure of reserves within equity [abstract] |  |  |  |
Investment-related subsidies |  | R$ 1,857 | R$ 1,857 | R$ 1,857
Goodwill on issuance of shares |  | 69 | 69 | 69
Shares in treasury |  | (1) | (1) | (1)
Capital reserves and shares in Treasury | R$ 324 | 1,925 | 1,925 | 1,925
Legal reserve |  | 853 | 853 | 853
Statutory Reserve |  | 57 | 57 | 57
Retained earnings reserve |  | 3,341 | 2,813 | 2,906
Incentives tax reserve |  | 58 | 57 | 50
Reserve for mandatory dividends not distributed |  | 1,420 | 1,420 | 797
Profit reserves |  | R$ 5,729 | R$ 5,200 | R$ 4,663

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- Definition The amount received or receivable from the issuance of the entity's shares in excess of nominal value and amounts received from other transactions involving the entity's stock or stockholders. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition A component of equity representing the entity's cumulative undistributed earnings or deficit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph IG6 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_IG6&doctype=Implementation%20Guidance -URIDate 2017-03-09 + Details
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- Definition A component of equity representing reserves created based on legal requirements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition An entity’s own equity instruments, held by the entity or other members of the consolidated group. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 32 -IssueDate 2017-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=32&date=2017-03-01&anchor=para_34&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Investment related subsidies. + References No definition available. + Details
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