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Schedule of summarized information of key subsidiaries Balance sheet (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
IfrsStatementLineItems [Line Items]        
ASSETS R$ 49,537,535 R$ 46,784,664    
Current assets 11,189,872 11,407,431    
Noncurrent assets 38,347,663 35,377,233    
Current liabilities 7,979,993 9,654,392    
Noncurrent liabilities 19,382,307 16,879,754    
Equity 22,175,235 20,250,518 R$ 17,598,212 R$ 16,336,214
Dona Francisca [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 180,425 128,798    
Current assets 13,570 14,562    
Noncurrent assets 166,855 114,236    
LIABILITIES 180,425 128,798    
Current liabilities 19,938 4,452    
Noncurrent liabilities 42,988 2,119    
Equity R$ 117,499 R$ 122,227    
Investment interest - % 23.03% 23.03%    
Investment book value R$ 27,057 R$ 28,147    
Foz Do Chopim [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 55,900 62,635    
Current assets 13,308 33,378    
Noncurrent assets 42,592 29,257    
LIABILITIES 55,900 62,635    
Current liabilities 2,495 34,723    
Noncurrent liabilities    
Equity R$ 53,405 R$ 27,912    
Investment interest - % 35.77% 35.77%    
Investment book value R$ 19,102 R$ 9,986