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Operating Costs And Expenses - Summary of Operating Provisions (Reversals) (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Operating Provisions Reversals [Line Items] |  |  |
Estimated losses on doubtful receivables | R$ 248 | R$ 382 | R$ 175
Estimated losses on other accounts receivables | 27 | 40 |
Contingency provisions (reversals) | 0 | 0 | 0
Labor claims | 206 | 120 | 4
Civil | 27 | 30 | 22
Tax | 7 | 2 | (4)
Environmental |  |  | (1)
Regulatory | (3) |  | 10
Other | (6) | 31 | (3)
Other provisions | 231 | 183 | 28
Adjustment for losses |  |  |
Provision for losses | 854 | 704 | 1,401
Put option [Member] | Parati [member] |  |  |
Adjustment for losses |  |  |
Provision for losses | 231 | 55 | 1,079
Put option [Member] | SAAG [Member] |  |  |
Adjustment for losses |  |  |
Provision for losses | 116 | 49 | R$ 119
Put option [Member] | Sonda [Member] |  |  |
Adjustment for losses |  |  |
Provision for losses | R$ 1 | R$ (5) |

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- Definition The amount of expense recognised during the period in respect of bad or doubtful debts due from related parties. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 18 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_18_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gains (losses) on loans and receivables. [Refer: Loans and receivables] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 20 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_20_a_iv&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The amount of reversals of provisions that the entity does not separately disclose in the same statement or note. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_g&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of liabilities of uncertain timing or the amount recognised when: (a) the entity has a present obligation (legal or constructive) as a result of a past event; (b) it is probable (ie more likely than not) that an outflow of resources embodying economic benefits will be required to settle the obligation; and (c) a reliable estimate can be made of the amount of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_l&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Civil cases provision. + References No definition available. + Details
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- Definition Environmental provision. + References No definition available. + Details
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- Definition Regulatory provisions. + References No definition available. + Details
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- Definition Tax provision. + References No definition available. + Details
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