v3.26.1
Deferred taxes and contributions (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
IfrsStatementLineItems [Line Items]    
Deferred income tax assets, beginning R$ 1,723,253 R$ 1,411,788
Deferred tax asset, changes 344,971 311,465
Deferred income tax assets, ending 2,068,224 1,723,253
Deferred income tax liabilities, beginning (4,385,144) (1,313,712)
Deferred tax liabilities, changes (812,988) (3,071,432)
Deferred income tax liabilities, ending (5,198,132) (4,385,144)
Initial balance (2,661,891) 98,076
Deferred tax assets, net, changes (468,017) (2,759,967)
Final balance (3,129,908) (2,661,891)
- consideration in the income statement (501,852) (2,756,296)
- consideration in equity valuation adjustments (Note 26) 33,835 (3,671)
Total net change (468,017) (2,759,967)
Tax Provisions [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax assets, beginning 839,864 666,131
Deferred tax asset, changes (186,236) 173,733
Deferred income tax assets, ending 653,628 839,864
Pension Obligations G 1 [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax assets, beginning 125,198 135,231
Deferred tax asset, changes 2 (10,033)
Deferred income tax assets, ending 125,200 125,198
Donations [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax assets, beginning 43,321 45,140
Deferred tax asset, changes (2,557) (1,819)
Deferred income tax assets, ending 40,764 43,321
Allowance For Doubtful Accounts [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax assets, beginning 177,271 182,519
Deferred tax asset, changes (60,840) (5,248)
Deferred income tax assets, ending 116,431 177,271
Allowance For Losses On Other Accounts Receivable [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax assets, beginning 50,515 54,905
Deferred tax asset, changes 3,911 (4,390)
Deferred income tax assets, ending 54,426 50,515
Allowance For Inventory Losses [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax assets, beginning 127,840 74,939
Deferred tax asset, changes (6,249) 52,901
Deferred income tax assets, ending 121,591 127,840
Allowance For Losses On Works And Projects [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax assets, beginning 57,606 1,839
Deferred tax asset, changes (47,052) 55,767
Deferred income tax assets, ending 10,554 57,606
Allowance For Losses On Write Off Of Assets [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax assets, beginning 42,812 8,930
Deferred tax asset, changes 3,978 33,882
Deferred income tax assets, ending 46,790 42,812
Performance Agreements [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax assets, beginning 74,670 62,517
Deferred tax asset, changes 6,473 12,153
Deferred income tax assets, ending 81,143 74,670
P V A Accounts Receivable [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax assets, beginning 100,913 102,216
Deferred tax asset, changes (11,840) (1,303)
Deferred income tax assets, ending 89,073 100,913
Loss Hedge [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax assets, beginning 4,302
Deferred tax asset, changes (4,302) 4,302
Deferred income tax assets, ending 4,302
Derivative Financial Instruments Profit Loss [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax assets, beginning 3,297
Deferred tax asset, changes 200,893 3,297
Deferred income tax assets, ending 204,190 3,297
Deferred P I S Cofins [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax assets, beginning  
Deferred tax asset, changes 432,777  
Deferred income tax assets, ending 432,777
Deferred Taxes Other [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax assets, beginning 75,644 77,421
Deferred tax asset, changes 16,013 (1,777)
Deferred income tax assets, ending 91,657 75,644
Temporary differences [member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax liabilities, beginning (314,641) (329,060)
Deferred tax liabilities, changes 24,513 14,419
Deferred income tax liabilities, ending (290,128) (314,641)
Capitalization Borrowing Costs [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax liabilities, beginning (461,362) (465,510)
Deferred tax liabilities, changes (64,913) 4,148
Deferred income tax liabilities, ending (526,275) (461,362)
Profit On Supply Government Entities [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax liabilities, beginning (334,477) (348,514)
Deferred tax liabilities, changes (239,444) 14,037
Deferred income tax liabilities, ending (573,921) (334,477)
Financial Asset [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax liabilities, beginning (3,111,446)
Deferred tax liabilities, changes (569,987) (3,111,446)
Deferred income tax liabilities, ending (3,681,433) (3,111,446)
Actuarial Gain Loss G 1 [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax liabilities, beginning (125,096) (121,425)
Deferred tax liabilities, changes 33,834 (3,671)
Deferred income tax liabilities, ending (91,262) (125,096)
Construction Margin [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax liabilities, beginning (37,842) (40,579)
Deferred tax liabilities, changes 2,729 2,737
Deferred income tax liabilities, ending (35,113) (37,842)
Borrowing Costs [Member]    
IfrsStatementLineItems [Line Items]    
Deferred income tax liabilities, beginning (280) (8,624)
Deferred tax liabilities, changes 280 8,344
Deferred income tax liabilities, ending R$ (280)