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Intangible assets (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning R$ 44,012,858 R$ 39,320,871 R$ 36,503,834
Additions 2,862,651 258,473 75,400
Contract renewal 9,033,117 7,247,309 5,179,364
Transfer of contract assets (42,843) (47,068) (4,751)
Write-offs and disposals (6,864) (7,627) (9,054)
Amortization (2,637,479) (2,759,100) (2,423,922)
Transfers to financial assets (8,450,316)    
Intangible assets, ending 44,771,124 44,012,858 39,320,871
Concession agreements – equity value [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 506,117 499,326 491,057
Additions 22
Contract renewal 13,216 27,774 27,166
Transfer of contract assets (508,709) (934) (144)
Write-offs and disposals (22) (307) (115)
Amortization (10,602) (19,764) (18,638)
Transfers to financial assets    
Intangible assets, ending 506,117 499,326
Concession agreements – economic value [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 637,760 652,039 681,441
Additions (181) 60 13
Contract renewal 13,005 115,841 48,428
Transfer of contract assets (576,439) 63 33,576
Write-offs and disposals (119) (9)
Amortization (74,145) (130,124) (111,410)
Transfers to financial assets    
Intangible assets, ending 637,760 652,039
Concession agreements – new contracts [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 147,589  
Additions 148,000  
Contract renewal  
Transfer of contract assets  
Write-offs and disposals  
Amortization (4,933) (411)  
Transfers to financial assets    
Intangible assets, ending 142,656 147,589
Concession agreements – others [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning    
Additions    
Contract renewal 4,090    
Transfer of contract assets 57,445    
Write-offs and disposals    
Amortization (2,043)    
Transfers to financial assets    
Intangible assets, ending 59,492  
Program contracts [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 20,684,497 18,337,459 17,152,021
Additions 159 6,635
Contract renewal 1,392,259 3,337,155 2,132,675
Transfer of contract assets (21,469,330) 93,417 2,944
Write-offs and disposals (1,020) (4,933) (2,800)
Amortization (606,406) (1,078,760) (954,016)
Transfers to financial assets    
Intangible assets, ending 20,684,497 18,337,459
Program contracts – commitments [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 1,212,026 1,264,992 1,317,957
Additions 2,728,100
Contract renewal
Transfer of contract assets
Write-offs and disposals
Amortization (90,367) (52,966) (52,965)
Transfers to financial assets    
Intangible assets, ending 3,849,759 1,212,026 1,264,992
Services contracts – Sao Paulo [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 20,193,585 17,870,451 16,158,771
Additions 430 208
Contract renewal 801,993 3,717,006 2,855,284
Transfer of contract assets (20,278,339) (113,378) (41,133)
Write-offs and disposals (1,327) (2,237) (6,063)
Amortization (715,912) (1,278,687) (1,096,616)
Transfers to financial assets    
Intangible assets, ending 20,193,585 17,870,451
Concession agreement – URAE-1 [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning    
Additions 20,712    
Contract renewal 6,573,841    
Transfer of contract assets 42,727,540    
Write-offs and disposals (4,449)    
Amortization (911,134)    
Transfers to financial assets (8,450,316)    
Intangible assets, ending 39,956,194  
Software License [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 513,224 595,404 598,734
Additions 29,972 1,397 214
Contract renewal 234,713 49,533 115,811
Transfer of contract assets 4,989 (88) 6
Write-offs and disposals
Amortization (144,611) (133,022) (119,361)
Transfers to financial assets    
Intangible assets, ending 638,287 513,224 595,404
Right of use – other assets [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 118,060 75,052 103,853
Additions 84,048 108,405 42,182
Contract renewal
Transfer of contract assets
Write-offs and disposals (46) (31) (67)
Amortization (77,326) (65,366) (70,916)
Transfers to financial assets    
Intangible assets, ending 124,736 118,060 75,052
Right of use – Investments [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets, beginning 26,148
Additions   26,148
Contract renewal  
Transfer of contract assets   (26,148)
Write-offs and disposals  
Amortization  
Intangible assets, ending   R$ 26,148