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17 Borrowings and financing (Details 4)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
25th issue debentures - Single Series [member]  
Disclosure of detailed information about borrowings [line items]  
Amount R$ 1,450,000
Maturity 10/2021
Remuneration CDI + 3.3 p.a.
26th issue debentures - Series 1 [member]  
Disclosure of detailed information about borrowings [line items]  
Amount R$ 600,000
Maturity 07/2027
Remuneration IPCA+ 4.65% p.a.
26th issue debentures - Series 2 [member]  
Disclosure of detailed information about borrowings [line items]  
Amount R$ 445,000
Maturity 07/2030
Remuneration IPCA+ 4.95% p.a.
27th issue debentures - Series 1 [member]  
Disclosure of detailed information about borrowings [line items]  
Amount R$ 300,000
Maturity 12/2023
Remuneration CDI+ 1,60 p.a.
27th issue debentures - Series 2 [member]  
Disclosure of detailed information about borrowings [line items]  
Amount R$ 400,000
Maturity 12/2025
Remuneration CDI+ 1,80 p.a.
27th issue debentures - Series 3 [member]  
Disclosure of detailed information about borrowings [line items]  
Amount R$ 300,000
Maturity 12/2027
Remuneration CDI+ 2,25 p.a.
BID - Tranche - Medium Term [member]  
Disclosure of detailed information about borrowings [line items]  
Amount R$ 442,000
Maturity 08/2029
Remuneration CDI+ 1.90 p.a.
BID - Tranche - Long Term [member]  
Disclosure of detailed information about borrowings [line items]  
Amount R$ 508,000
Maturity 08/2034
Remuneration CDI+ 2.70 p.a.