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Accounting policies and determination criteria (Tables)
 12 Months Ended
Dec. 31, 2025
Accounting Policies And Determination Criteria  
Schedule of financial assets and liabilities subject to offsetting
     
Thousand of Reais     2025
       
Assets: Financial assets, gross Financial assets
offset in the balance sheet		 Financial assets, net
Derivatives 70,667,950 (4,860,252) 65,807,698
       
Liabilities: Financial liabilities, gross Financial liabilities
offset in the balance sheet		 Financial liabilities, net
Derivatives 64,872,243 (4,860,252) 60,011,991
       
Thousand of Reais     2024
       
Assets: Financial assets, gross Financial assets
offset in the balance sheet		 Financial assets, net
Derivatives 42,380,547 (2,174,248) 40,206,299
       
Liabilities: Financial liabilities, gross Financial liabilities
offset in the balance sheet		 Financial liabilities, net
Derivatives 41,584,522 (2,174,248) 39,410,274
Schedule of lease liability restated for inflation
 
IGP-M forecast  
Up to 3 months 1.0%
From 3 to 12 months 4.0%
From 1 year to 3 years 4.0%
From 3 years to 5 years 4.0%
Over 5 years 4.0%
Schedule of estimated average years of useful life of the different assets
           
            Annual Rate
             
Buildings for own use           4%
Furniture           10%
Fixtures           10%
Office and IT equipment           20%
Improvements on third-party properties           4% or until the contract’s expiration date