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Obligations for pension and similar liabilities (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]      
Post Employment Plans, Beginning balance R$ 22,996,370 R$ 26,241,550 R$ 24,106,720
Other Similar Obligations, Beginning balance 4,689,396 5,130,333 4,588,664
Post Employment Plans, Costs of current services 255 586 (911)
Other Similar Obligations, Cost of current services 5,586 5,694 4,903
Post Employment Plans, Interest cost 2,322,447 2,247,577 2,188,015
Other Similar Obligations, Interest cost 486,529 438,944 429,103
Post Employment Plans, Paid benefits (2,822,774) (4,721,231) (2,487,932)
Other Similar Obligations, Paid benefits (547,991) (489,818) (448,912)
Post Employment Plans, Actuarial losses (gains) 546,209 (1,040,157) 2,433,313
Other Similar Obligations, Actuarial losses (gains) 841,514 (395,757) 556,575
Post Employment Plans, Others 2,510 268,045 2,345
Other Similar Obligations, Others (137)    
Post Employment Plans, Ending balance 23,045,017 22,996,370 26,241,550
Other Similar Obligations, Ending balance 5,474,897 4,689,396 5,130,333
Post Employment Plans, Fair value of plan assets 25,289,715 26,158,640 27,328,362
Other Similar Obligations, Fair value of plan assets 5,253,707 5,008,751 5,570,354
Post Employment Plans, Unrecognized assets (2,624,294) (3,617,497) (2,649,505)
Other Similar Obligations, Unrecognized assets (368,511) (877,078) (1,082,010)
Post Employment Plans, Provisions net 379,596 455,227 1,562,693
Other Similar Obligations, Provisions net 589,701 557,723 641,989
Total provisions for pension plans, net 969,317 1,023,424 2,204,684
Actuarial provisions 1,357,203 1,364,437 2,543,504
Actuarial assets 387,886 341,013 338,820
Post Employment Plans, Plan Experience (670,274) (2,343,241) (585,676)
Other Similar Obligations, Plan Experience (738,349) (416,984) (171,107)
Post Employment Plans, Changes in Financial Assumptions 123,950 3,347,376 (1,652,752)
Other Similar Obligations, Changes in Financial Assumptions 11,000 770,940 (419,306)
Post Employment Plans, Changes in Demographic Assumptions     (178,125)
Other Similar Obligations, Changes in Demographic Assumptions (114,165) 41,519 33,838
Post Employment Plans, Actuarial Gain (Loss) - Obligation (546,324) 1,004,135 (2,416,553)
Other Similar Obligations, Actuarial Gain (Loss) - Obligation (841,514) 395,475 (556,575)
Post Employment Plans, Return on Investments Different from the Return Implicit in the Discount Rate (1,338,033) (1,183,609) (127,052)
Other Similar Obligations, Return on Investments Different from the Return Implicit in the Discount Rate 37,908 (771,685) 387,599
Post Employment Plans, Gain (Loss) Actuarial - Asset (1,338,033) (1,183,609) (127,052)
Post Employment Plans, Changes in Surplus Irrecoverable Deficit 1,356,862 (704,716) 1,801,693
Other Similar Obligations, Changes in Surplus Irrecoverable Deficit 598,347 304,272 (89,852)
Post Employment Plans [Member]      
IfrsStatementLineItems [Line Items]      
Experience in Net Assets Adjustments (1,338,149) (1,200,878) (99,752)
Other Similar Obligations [Member]      
IfrsStatementLineItems [Line Items]      
Experience in Net Assets Adjustments R$ 37,761 R$ (772,305) R$ 387,599