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Deferred taxes and contributions (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning R$ 1,012,595 R$ 931,736 R$ 905,258
Deferred tax asset, changes 106,664 80,859 26,478
Deferred income tax assets, ending R$ 1,119,259 R$ 1,012,595 R$ 931,736
Deferred income tax liabilities, beginning (1,296,334) (1,252,452) (1,339,254)
Deferred tax liabilities, changes (12,203) (43,882) 86,802
Deferred income tax liabilities, ending (1,308,537) (1,296,334) (1,252,452)
Opening balance (283,739) (320,716) (433,996)
Deferred tax assets, net, changes 94,461 36,977 113,280
Closing balance (189,278) (283,739) (320,716)
 - corresponding entry to the income statement 78,751 97,269 108,037
 - corresponding entry to valuation adjustments to equity (Note 22) 15,710 (60,292) 5,243
Total net change 94,461 36,977 113,280
Tax Provisions [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning R$ 503,374 R$ 436,445 R$ 366,673
Deferred tax asset, changes 57,030 66,929 69,772
Deferred income tax assets, ending R$ 560,404 R$ 503,374 R$ 436,445
Pension Obligations G 1 [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning R$ 150,577 R$ 154,498 R$ 157,998
Deferred tax asset, changes (8,971 (3,921 (3,500
Deferred income tax assets, ending R$ 141,606 R$ 150,577 R$ 154,498
Donations [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning R$ 47,589 R$ 50,142 R$ 51,818
Deferred tax asset, changes (1,501 (2,553 (1,676
Deferred income tax assets, ending R$ 46,088 R$ 47,589 R$ 50,142
Credit Losses [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning R$ 183,963 R$ 155,719 R$ 145,622
Deferred tax asset, changes 15,400 28,244 10,097
Deferred income tax assets, ending R$ 199,363 R$ 183,963 R$ 155,719
Deferred Taxes Other [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax assets, beginning R$ 127,092 R$ 134,932 R$ 183,147
Deferred tax asset, changes 44,706 (7,840 (48,215
Deferred income tax assets, ending R$ 171,798 R$ 127,092 R$ 134,932
Temporary differences [member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax liabilities, beginning (368,235) (388,675) (408,732)
Deferred tax liabilities, changes 14,418 20,440 20,057
Deferred income tax liabilities, ending (353,817) (368,235) (388,675)
Capitalization Borrowing Costs [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax liabilities, beginning (404,931) (390,211) (409,236)
Deferred tax liabilities, changes (52,738) (14,720) 19,025
Deferred income tax liabilities, ending (457,669) (404,931) (390,211)
Profit On Supply Government Entities [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax liabilities, beginning (353,262) (356,513) (372,289)
Deferred tax liabilities, changes 6,612 3,251 15,776
Deferred income tax liabilities, ending (346,650) (353,262) (356,513)
Actuarial Gain Loss G 1 [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax liabilities, beginning (109,271) (48,979) (54,222)
Deferred tax liabilities, changes 15,710 (60,292) 5,243
Deferred income tax liabilities, ending (93,561) (109,271) (48,979)
Construction Margin [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax liabilities, beginning (46,079) (48,843) (83,399)
Deferred tax liabilities, changes 2,756 2,764 34,556
Deferred income tax liabilities, ending (43,323) (46,079) (48,843)
Borrowing Costs [Member]      
IfrsStatementLineItems [Line Items]      
Deferred income tax liabilities, beginning (14,556) (19,231) (11,376)
Deferred tax liabilities, changes 1,039 4,675 (7,855)
Deferred income tax liabilities, ending R$ (13,517) R$ (14,556) R$ (19,231)