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Intangible assets (Details 1) - BRL (R$)
R$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning R$ 44,012,858 R$ 39,320,871
Additions 133,759 322
Transfer of contract assets 1,082,990 1,105,061
Transfers (4,843) (28,780)
Write-offs and disposals (804) (3,232)
Amortization (764,838) (650,041)
Intangible assets, ending 44,459,122 39,744,201
Agreements Equity Value [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 506,117 499,326
Additions
Transfer of contract assets 6,587 4,098
Transfers 39 (955)
Write-offs and disposals (20) (6)
Amortization (5,327) (4,994)
Intangible assets, ending 507,396 497,469
Agreements Economic Value [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 637,760 652,039
Additions
Transfer of contract assets 1,089 2,589
Transfers (4) 331
Write-offs and disposals (85)
Amortization (37,054) (30,249)
Intangible assets, ending 601,791 624,625
Agreements New Contracts [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 147,589  
Additions  
Transfer of contract assets  
Transfers  
Write-offs and disposals  
Amortization (1,233)  
Intangible assets, ending 146,356  
Program Contracts [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 20,684,497 18,337,459
Additions 181 2
Transfer of contract assets 663,509 569,717
Transfers (930) (288)
Write-offs and disposals (606) (2,055)
Amortization (296,369) (252,011)
Intangible assets, ending 21,050,282 18,652,824
Program Contracts Commitments [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 1,212,026 1,264,992
Additions
Transfer of contract assets
Transfers
Write-offs and disposals
Amortization (13,242) (13,242)
Intangible assets, ending 1,198,784 1,251,750
Service Contracts Sao Paulo[Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 20,193,585 17,870,451
Additions
Transfer of contract assets 404,279 513,453
Transfers (3,949) (1,720)
Write-offs and disposals (132) (1,056)
Amortization (354,719) (299,179)
Intangible assets, ending 20,239,064 18,081,949
Software License [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 513,224 595,404
Additions 2,911
Transfer of contract assets 7,526 15,204
Transfers 1
Write-offs and disposals
Amortization (34,904) (33,105)
Intangible assets, ending 488,758 577,503
Right Of Use Other Assets [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning 118,060 75,052
Additions 130,667 320
Transfer of contract assets
Transfers
Write-offs and disposals (46) (30)
Amortization (21,990) (17,261)
Intangible assets, ending R$ 226,691 58,081
Right Of Use Investments [Member]    
IfrsStatementLineItems [Line Items]    
Intangible assets, beginning   26,148
Additions  
Transfer of contract assets  
Transfers   (26,148)
Write-offs and disposals  
Amortization  
Intangible assets, ending