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Risk management (Details 6) - BRL (R$)
R$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Liabilities    
Borrowings and financing R$ 29,485,118  
Trade payables and contractors 490,494  
Services payable 838,703 R$ 750,732
Public-Private Partnership - PPP 8,367,087  
Program Contract Commitments 36,940  
Total 39,218,342  
Twenty Twenty Four [Member]    
Liabilities    
Borrowings and financing 3,051,567  
Trade payables and contractors 490,494  
Services payable 838,703  
Public-Private Partnership - PPP 432,216  
Program Contract Commitments 20,310  
Total 4,833,290  
Twenty Twenty Five [Member]    
Liabilities    
Borrowings and financing 3,773,001  
Trade payables and contractors  
Services payable  
Public-Private Partnership - PPP 446,524  
Program Contract Commitments 1,232  
Total 4,220,757  
Twenty Twenty Six [Member]    
Liabilities    
Borrowings and financing 3,368,294  
Trade payables and contractors  
Services payable  
Public-Private Partnership - PPP 461,438  
Program Contract Commitments 1,232  
Total 3,830,964  
Twenty Twenty Seven [Member]    
Liabilities    
Borrowings and financing 3,278,126  
Trade payables and contractors  
Services payable  
Public-Private Partnership - PPP 476,850  
Program Contract Commitments 1,232  
Total 3,756,208  
Twenty Twenty Eight [Member]    
Liabilities    
Borrowings and financing 2,418,568  
Trade payables and contractors  
Services payable  
Public-Private Partnership - PPP 492,777  
Program Contract Commitments 1,232  
Total 2,912,577  
Twenty Twenty Nine Onwards [Member]    
Liabilities    
Borrowings and financing 13,595,562  
Trade payables and contractors  
Services payable  
Public-Private Partnership - PPP 6,057,282  
Program Contract Commitments 11,702  
Total R$ 19,664,546