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20 Provisions (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of provisions [Line Items]      
Provisions, beginning R$ 1,035,808 R$ 892,862 R$ 1,078,204
Additional provisions 270,575 348,388 162,859
Interest and inflation adjustment 295,777 252,243 124,057
Use of the accrual (214,689) (250,280) (244,077)
Amounts not used (reversal) (135,169) (207,405) (228,181)
Provisions, ending 1,252,302 1,035,808 892,862
Customer claims [member]      
Summary of provisions [Line Items]      
Provisions, beginning 253,665 290,649 438,619
Additional provisions 16,465 57,314 29,732
Interest and inflation adjustment 19,638 53,929 40,749
Use of the accrual (78,640) (99,379) (141,421)
Amounts not used (reversal) (50,423) (48,848) (77,030)
Provisions, ending 160,705 253,665 290,649
Supplier claims [member]      
Summary of provisions [Line Items]      
Provisions, beginning 153,654 67,985 332,037
Additional provisions 149,566 54,223 36,100
Interest and inflation adjustment 201,259 102,686 21,161
Use of the accrual (68,801) (42,948) (308,253)
Amounts not used (reversal) (24,944) (28,292) (13,060)
Provisions, ending 410,734 153,654 67,985
Other civil claims [member]      
Summary of provisions [Line Items]      
Provisions, beginning 93,910 98,302 114,544
Additional provisions 15,944 28,888 22,578
Interest and inflation adjustment 11,109 18,713 12,939
Use of the accrual (23,009) (9,766) (16,146)
Amounts not used (reversal) (11,871) (42,227) (35,613)
Provisions, ending 86,083 93,910 98,302
Tax claims [member]      
Summary of provisions [Line Items]      
Provisions, beginning 59,143 63,335 77,100
Additional provisions 4,333 11,821 10,763
Interest and inflation adjustment 2,737 2,918 4,157
Use of the accrual (1,875) (4,982) (2,490)
Amounts not used (reversal) (4,660) (13,949) (26,195)
Provisions, ending 59,678 59,143 63,335
Labor claims [member]      
Summary of provisions [Line Items]      
Provisions, beginning 325,129 302,935 299,842
Additional provisions 61,782 167,995 83,499
Interest and inflation adjustment 35,541 61,483 32,290
Use of the accrual (61,039) (112,084) (44,900)
Amounts not used (reversal) (44,533) (95,200) (67,796)
Provisions, ending 316,880 325,129 302,935
Environmental claims [member]      
Summary of provisions [Line Items]      
Provisions, beginning 192,950 170,419 160,446
Additional provisions 35,392 42,198 33,392
Interest and inflation adjustment 27,718 24,358 18,294
Use of the accrual 0 (312) (115)
Amounts not used (reversal) (6,478) (43,713) (41,598)
Provisions, ending 249,582 192,950 170,419
Subtotal [member]      
Summary of provisions [Line Items]      
Provisions, beginning 1,078,451 993,625 1,422,588
Additional provisions 283,482 362,439 216,064
Interest and inflation adjustment 298,002 264,087 129,590
Use of the accrual (233,364) (269,471) (513,325)
Amounts not used (reversal) (142,909) (272,229) (261,292)
Provisions, ending 1,283,662 1,078,451 993,625
Escrow deposits [member]      
Summary of provisions [Line Items]      
Provisions, beginning (42,643) (100,763) (344,384)
Additional provisions (12,907) (14,051) (53,205)
Interest and inflation adjustment (2,225) (11,844) (5,533)
Use of the accrual 18,675 19,191 269,248
Amounts not used (reversal) 7,740 64,824 33,111
Provisions, ending R$ (31,360) R$ (42,643) R$ (100,763)