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Investments (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]        
ASSETS R$ 55,819,074 R$ 49,703,700    
Current assets 13,715,730 9,327,249    
Noncurrent assets 42,103,344 40,376,451    
LIABILITIES 55,819,074 49,703,700    
Current liabilities 9,309,433 7,156,597    
Noncurrent liabilities 22,317,974 21,415,878    
Equity 24,191,667 21,131,225 R$ 22,175,235 R$ 20,250,518
Net operating revenue 21,479,468 20,535,341 20,976,216  
Income tax and social contribution 354,057 (281,099) 1,178,524  
Net income 2,327,168 1,149,321 5,048,602  
Total comprehensive income 2,072,843 1,359,308 5,201,347  
Dona Francisca [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 170,927 175,415    
Current assets 15,403 10,148    
Noncurrent assets 155,524 165,267    
LIABILITIES 170,927 175,415    
Current liabilities 19,951 22,373    
Noncurrent liabilities 17,189 31,266    
Equity R$ 133,787 R$ 121,776    
Investment interest - % 23.03% 23.03%    
Investment book value R$ 30,812 R$ 28,043    
Net operating revenue 66,166 66,163 66,797  
Depreciation and amortization (11,026) (11,646) (5,464)  
Other operating costs and expenses (25,884) (21,814) (21,141)  
Financial results (3,456) (5,172) (664)  
Income tax and social contribution (2,557) (3,009) (2,298)  
Net income 23,243 24,522 37,230  
Other comprehensive income  
Total comprehensive income 23,243 24,522 37,230  
Foz Do Chopim [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 47,069 51,449    
Current assets 9,330 11,730    
Noncurrent assets 37,739 39,719    
LIABILITIES 47,069 51,449    
Current liabilities 2,022 3,596    
Noncurrent liabilities (0) (0)    
Equity R$ 45,047 R$ 47,853    
Investment interest - % 35.77% 35.77%    
Investment book value R$ 16,113 R$ 17,116    
Net operating revenue 60,593 77,779 60,943  
Depreciation and amortization (2,634) (2,957) (1,499)  
Other operating costs and expenses (9,610) (15,707) (9,276)  
Financial results 207 449 (1,703)  
Income tax and social contribution (2,009) (2,617) (2,060)  
Net income 46,547 56,947 46,405  
Other comprehensive income  
Total comprehensive income R$ 46,547 R$ 56,947 R$ 46,405