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20. Provisions (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SummaryOfProvisionsLineItems [Line Items]      
Provisions, beginning R$ 1,078,204 R$ 1,173,075 R$ 1,082,214
Additional provisions 162,859 128,447 245,403
Interest and inflation adjustment 124,057 148,336 199,117
Use of the accrual (244,077) (250,862) (147,524)
Amounts not used (reversal) (228,181) (120,792) (206,135)
Provisions, ending 892,862 1,078,204 1,173,075
Customer claims      
SummaryOfProvisionsLineItems [Line Items]      
Provisions, beginning 438,619 572,210 561,061
Additional provisions 29,732 26,642 109,540
Interest and inflation adjustment 40,749 44,805 95,459
Use of the accrual (141,421) (138,466) (87,334)
Amounts not used (reversal) (77,030) (66,572) (106,516)
Provisions, ending 290,649 438,619 572,210
Supplier claims      
SummaryOfProvisionsLineItems [Line Items]      
Provisions, beginning 332,037 332,667 296,660
Additional provisions 36,100 23,017 12,885
Interest and inflation adjustment 21,161 36,888 43,679
Use of the accrual (308,253) (39,433) (20,018)
Amounts not used (reversal) (13,060) (21,102) (539)
Provisions, ending 67,985 332,037 332,667
Other civil claims      
SummaryOfProvisionsLineItems [Line Items]      
Provisions, beginning 114,544 131,286 124,833
Additional provisions 22,578 13,517 20,638
Interest and inflation adjustment 12,939 12,057 19,940
Use of the accrual (16,146) (19,975) (8,080)
Amounts not used (reversal) (35,613) (22,341) (26,045)
Provisions, ending 98,302 114,544 131,286
Tax claims      
SummaryOfProvisionsLineItems [Line Items]      
Provisions, beginning 77,100 69,898 62,812
Additional provisions 10,763 6,877 20,716
Interest and inflation adjustment 4,157 7,392 14,265
Use of the accrual (2,490) (259) (4,621)
Amounts not used (reversal) (26,195) (6,808) (23,274)
Provisions, ending 63,335 77,100 69,898
Labor claims      
SummaryOfProvisionsLineItems [Line Items]      
Provisions, beginning 299,842 285,413 283,991
Additional provisions 83,499 55,106 51,408
Interest and inflation adjustment 32,290 38,861 29,419
Use of the accrual (44,900) (43,498) (37,072)
Amounts not used (reversal) (67,796) (36,040) (42,333)
Provisions, ending 302,935 299,842 285,413
Environmental claims      
SummaryOfProvisionsLineItems [Line Items]      
Provisions, beginning 160,446 150,084 83,520
Additional provisions 33,392 32,377 68,485
Interest and inflation adjustment 18,294 16,156 23,508
Use of the accrual (115) (24,585) 0
Amounts not used (reversal) (41,598) (13,586) (25,429)
Provisions, ending 170,419 160,446 150,084
Subtotal      
SummaryOfProvisionsLineItems [Line Items]      
Provisions, beginning 1,422,588 1,541,558 1,412,877
Additional provisions 216,064 157,536 283,672
Interest and inflation adjustment 129,590 156,159 226,270
Use of the accrual (513,325) (266,216) (157,125)
Amounts not used (reversal) (261,292) (166,449) (224,136)
Provisions, ending 993,625 1,422,588 1,541,558
Escrow deposits      
SummaryOfProvisionsLineItems [Line Items]      
Provisions, beginning (344,384) (368,483) (330,663)
Additional provisions (53,205) (29,089) (38,269)
Interest and inflation adjustment (5,533) (7,823) (27,153)
Use of the accrual 269,248 15,354 9,601
Amounts not used (reversal) 33,111 45,657 18,001
Provisions, ending R$ (100,763) R$ (344,384) R$ (368,483)