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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)

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