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20. Provision, Contingencies, and Commitments (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Provision Contingencies And Commitments Details Narrative    
Escrow deposits made under preliminary injunction R$ 483,485 R$ 457,868
Provisions for lawsuits and administrative proceedings 89,296 69,350
Provisions for labor litigation filed by former employees 82,425 65,162
Possible contingency 2,576,583 2,252,637
Contingent liabilities for tax matters and social security 1,709,435 1,519,658
IPI contingency 166,003 169,889
Legal proceedings related to ICMS 618,774 626,393
ICMS credits 307,255 283,367
Offset claims and credit disallowances 645,868 450,120
Contingent liabilities for civil, environmental and regulatory claims 593,437 480,065
Penalty on Ultragaz 32,315 31,281
Contingent liabilities for labor matters R$ 273,711 R$ 252,914