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21 Loans and Financing (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Loans and financing, beginning R$ 3,142,383 R$ 4,047,307
Funding 263,000 796,296
Charges 183,265 274,549
Monetary and exchange variations 37,058 11,077
Amortization - principal (253,700) (1,660,869)
Payment - charges (183,475) (325,977)
Loans and financing, ending 3,188,531 3,142,383
Foreign Currency [member]    
Disclosure of detailed information about borrowings [line items]    
Loans and financing, beginning 108,983 104,751
Funding
Charges 6,928 5,599
Monetary and exchange variations 31,189 4,170
Amortization - principal
Payment - charges (6,763) (5,537)
Loans and financing, ending 140,337 108,983
Local Currency [member]    
Disclosure of detailed information about borrowings [line items]    
Loans and financing, beginning 3,033,400 3,942,556
Funding 263,000 796,296
Charges 176,337 268,950
Monetary and exchange variations 5,869 6,907
Amortization - principal (253,700) (1,660,869)
Payment - charges (176,712) (320,440)
Loans and financing, ending R$ 3,048,194 R$ 3,033,400