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Deferred taxes and contributions (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning R$ 1,411,788 R$ 1,119,259 R$ 1,012,595
Deferred tax asset, changes 311,465 292,529 106,664
Deferred income tax assets, ending 1,723,253 1,411,788 1,119,259
Deferred income tax liabilities, beginning (1,313,712) (1,308,537) (1,296,334)
Deferred tax liabilities, changes (3,071,432) (5,175) (12,203)
Deferred income tax liabilities, ending (4,385,144) (1,313,712) (1,308,537)
Opening balance 98,076 (189,278) (283,739)
Deferred tax assets, net, changes (2,759,967) 287,354 94,461
Closing balance (2,661,891) 98,076 (189,278)
 - corresponding entry to the income statement (2,756,296) 315,218 78,751
 - corresponding entry to valuation adjustments to equity (Note 22) (3,671) (27,864) 15,710
Total net change (2,759,967) 287,354 94,461
Tax Provisions [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning 666,131 560,404 503,374
Deferred tax asset, changes 173,733 105,727 57,030
Deferred income tax assets, ending 839,864 666,131 560,404
Pension Obligations - G1 [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning 135,231 141,606 150,577
Deferred tax asset, changes (10,033) (6,375) (8,971)
Deferred income tax assets, ending 125,198 135,231 141,606
Donations [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning 45,140 46,088 47,589
Deferred tax asset, changes (1,819) (948) (1,501)
Deferred income tax assets, ending 43,321 45,140 46,088
Credit Losses [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning 182,519 199,363 183,963
Deferred tax asset, changes (5,248) (16,844) 15,400
Deferred income tax assets, ending 177,271 182,519 199,363
Estimated Losses With Other Accounts Receivable [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning 54,905 47,629 36,876
Deferred tax asset, changes (4,390) 7,276 10,753
Deferred income tax assets, ending 50,515 54,905 47,629
Estimated Losses With Inventory Losses [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning 74,939 63,718 57,197
Deferred tax asset, changes 52,901 11,221 6,521
Deferred income tax assets, ending 127,840 74,939 63,718
Estimated Losses With Works And Projects [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning 1,839 1,839 1,334
Deferred tax asset, changes 55,767   505
Deferred income tax assets, ending 57,606 1,839 1,839
Estimated Losses With The Writeoff Of Assets [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning 8,930 8,930 14,018
Deferred tax asset, changes 33,882 (5,088)
Deferred income tax assets, ending 42,812 8,930 8,930
Performance Agreements [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning 62,517  
Deferred tax asset, changes 12,153 62,517  
Deferred income tax assets, ending 74,670 62,517
PVA - Accounts Receivable [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning 102,216 95,626 35,821
Deferred tax asset, changes (1,303) 6,590 59,805
Deferred income tax assets, ending 100,913 102,216 95,626
Loss Hedge [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning    
Deferred tax asset, changes 4,302    
Deferred income tax assets, ending 4,302  
Derivative Financial Instruments Profit Loss [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning    
Deferred tax asset, changes 3,297    
Deferred income tax assets, ending 3,297  
Deferred Taxes Other [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning 77,421 (45,944) (18,154)
Deferred tax asset, changes (1,777) 123,365 (27,790)
Deferred income tax assets, ending 75,644 77,421 (45,944)
Temporary differences [member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax liabilities, beginning (329,060) (353,817) (368,235)
Deferred tax liabilities, changes 14,419 24,757 14,418
Deferred income tax liabilities, ending (314,641) (329,060) (353,817)
Capitalization Borrowing Costs [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax liabilities, beginning (465,510) (457,669) (404,931)
Deferred tax liabilities, changes 4,148 (7,841) (52,738)
Deferred income tax liabilities, ending (461,362) (465,510) (457,669)
Profit On Supply Government Entities [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax liabilities, beginning (348,514) (346,650) (353,262)
Deferred tax liabilities, changes 14,037 (1,864) 6,612
Deferred income tax liabilities, ending (334,477) (348,514) (346,650)
Financial Asset [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax liabilities, beginning    
Deferred tax liabilities, changes (3,111,446)    
Deferred income tax liabilities, ending (3,111,446)  
Actuarial Gain - G1 [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax liabilities, beginning (121,425) (93,561) (109,271)
Deferred tax liabilities, changes (3,671) (27,864) 15,710
Deferred income tax liabilities, ending (125,096) (121,425) (93,561)
Construction Margin [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax liabilities, beginning (40,579) (43,323) (46,079)
Deferred tax liabilities, changes 2,737 2,744 2,756
Deferred income tax liabilities, ending (37,842) (40,579) (43,323)
Borrowing Costs [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax liabilities, beginning (8,624) (13,517) (14,556)
Deferred tax liabilities, changes 8,344 4,893 1,039
Deferred income tax liabilities, ending R$ (280) R$ (8,624) R$ (13,517)