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19. Provisions (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
SummaryOfProvisionsLineItems [Line Items] |  |  |
Provisions, beginning | R$ 730,334 | R$ 1,082,214 | R$ 1,220,347
Additional provisions | 128,447 | 245,403 | 171,132
Interest and inflation adjustment | 148,336 | 199,117 | 186,765
Use of the accrual | (250,862) | (147,524) | (116,535)
Amounts not used (reversal) | (120,792) | (206,135) | (379,495)
Provisions, ending | 607,959 | 730,334 | 1,082,214
Customer claims |  |  |
SummaryOfProvisionsLineItems [Line Items] |  |  |
Provisions, beginning | 572,210 | 561,061 | 638,637
Additional provisions | 26,642 | 109,540 | 34,868
Interest and inflation adjustment | 44,805 | 95,459 | 96,735
Use of the accrual | (138,466) | (87,334) | (92,203)
Amounts not used (reversal) | (66,572) | (106,516) | (116,976)
Provisions, ending | 438,619 | 572,210 | 561,061
Supplier claims |  |  |
SummaryOfProvisionsLineItems [Line Items] |  |  |
Provisions, beginning | 332,667 | 296,660 | 260,854
Additional provisions | 23,017 | 12,885 | 7,062
Interest and inflation adjustment | 36,888 | 43,679 | 39,143
Use of the accrual | (39,433) | (20,018) | (5,837)
Amounts not used (reversal) | (21,102) | (539) | (4,562)
Provisions, ending | 332,037 | 332,667 | 296,660
Other civil claims |  |  |
SummaryOfProvisionsLineItems [Line Items] |  |  |
Provisions, beginning | 131,286 | 124,833 | 126,403
Additional provisions | 13,517 | 20,638 | 13,022
Interest and inflation adjustment | 12,057 | 19,940 | 20,643
Use of the accrual | (19,975) | (8,080) | (12,778)
Amounts not used (reversal) | (22,341) | (26,045) | (22,457)
Provisions, ending | 114,544 | 131,286 | 124,833
Tax claims |  |  |
SummaryOfProvisionsLineItems [Line Items] |  |  |
Provisions, beginning | 69,898 | 62,812 | 55,554
Additional provisions | 6,877 | 20,716 | 1,501
Interest and inflation adjustment | 7,392 | 14,265 | 8,557
Use of the accrual | (259) | (4,621) | (266)
Amounts not used (reversal) | (6,808) | (23,274) | (2,534)
Provisions, ending | 77,100 | 69,898 | 62,812
Labor claims |  |  |
SummaryOfProvisionsLineItems [Line Items] |  |  |
Provisions, beginning | 285,413 | 283,991 | 235,466
Additional provisions | 55,106 | 51,408 | 114,499
Interest and inflation adjustment | 38,861 | 29,419 | 27,231
Use of the accrual | (43,498) | (37,072) | (23,431)
Amounts not used (reversal) | (36,040) | (42,333) | (69,774)
Provisions, ending | 299,842 | 285,413 | 283,991
Environmental claims |  |  |
SummaryOfProvisionsLineItems [Line Items] |  |  |
Provisions, beginning | 150,084 | 83,520 | 226,404
Additional provisions | 32,377 | 68,485 | 17,072
Interest and inflation adjustment | 16,156 | 23,508 | 16,247
Use of the accrual | (24,585) | 0 | (8,081)
Amounts not used (reversal) | (13,586) | (25,429) | (168,122)
Provisions, ending | 160,446 | 150,084 | 83,520
Subtotal |  |  |
SummaryOfProvisionsLineItems [Line Items] |  |  |
Provisions, beginning | 1,541,558 | 1,412,877 | 1,543,318
Additional provisions | 157,536 | 283,672 | 188,024
Interest and inflation adjustment | 156,159 | 226,270 | 208,556
Use of the accrual | (266,216) | (157,125) | (142,596)
Amounts not used (reversal) | (166,449) | (224,136) | (384,425)
Provisions, ending | 1,422,588 | 1,541,558 | 1,412,877
Escrow deposits |  |  |
SummaryOfProvisionsLineItems [Line Items] |  |  |
Provisions, beginning | (368,483) | (330,663) | (322,971)
Additional provisions | (29,089) | (38,269) | (16,892)
Interest and inflation adjustment | (7,823) | (27,153) | (21,791)
Use of the accrual | 15,354 | 9,601 | 26,061
Amounts not used (reversal) | 45,657 | 18,001 | 4,930
Provisions, ending | R$ (344,384) | R$ (368,483) | R$ (330,663)

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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 2017-01-01 -Paragraph 84 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase in other provisions through adjustments arising from the passage of time. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount used (ie incurrent 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 2017-01-01 -Paragraph 84 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_c&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 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 2017-01-01 -Paragraph 84 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_d&doctype=Standard -URIDate 2017-03-09 + Details
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