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15 Intangible assets (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Summary of intangible assets [Line Items]    
Current liabilities R$ 130,207 R$ 110,291
Noncurrent liabilities 3,045,066 3,183,689
Total liabilities 3,175,273 3,293,980
Alto Tiete [member]    
Summary of intangible assets [Line Items]    
Current liabilities 59,429 44,003
Noncurrent liabilities 149,726 208,217
Total liabilities 209,155 252,220
Sao Lourenco [member]    
Summary of intangible assets [Line Items]    
Current liabilities 70,778 66,288
Noncurrent liabilities 2,895,340 2,975,472
Total liabilities R$ 2,966,118 R$ 3,041,760