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22 Debentures (Details 1)
R$ in Thousands
Dec. 31, 2019
BRL (R$)
Disclosure of detailed information about borrowings [line items]  
Gross debt R$ 7,349,883
Transaction cost (84,474)
Net debt 7,265,409
2021 [Member]  
Disclosure of detailed information about borrowings [line items]  
Gross debt 1,851,659
Transaction cost (20,991)
Net debt 1,830,668
2022 [Member]  
Disclosure of detailed information about borrowings [line items]  
Gross debt 2,393,255
Transaction cost (20,900)
Net debt 2,372,355
2023 [Member]  
Disclosure of detailed information about borrowings [line items]  
Gross debt 1,290,978
Transaction cost (13,143)
Net debt 1,277,835
2024 [Member]  
Disclosure of detailed information about borrowings [line items]  
Gross debt 640,764
Transaction cost (7,438)
Net debt 633,326
2025 [Member]  
Disclosure of detailed information about borrowings [line items]  
Gross debt 478,666
Transaction cost (5,505)
Net debt 473,161
After 2025 [Member]  
Disclosure of detailed information about borrowings [line items]  
Gross debt 694,561
Transaction cost (16,497)
Net debt R$ 678,064