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Intangible assets (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Cost R$ 57,924,819 R$ 52,850,974  
Accumulated amortization (18,603,948) (16,347,140)  
Net 39,320,871 36,503,834 R$ 32,325,447
Agreements Equity Values [Member]      
IfrsStatementLineItems [Line Items]      
Cost 722,730 696,728  
Accumulated amortization (223,404) (205,671)  
Net 499,326 491,057  
Agreements Economic Value [Member]      
IfrsStatementLineItems [Line Items]      
Cost 1,585,271 1,497,968  
Accumulated amortization (933,232) (816,527)  
Net 652,039 681,441 712,852
Program Contractses [Member]      
IfrsStatementLineItems [Line Items]      
Cost 26,875,408 24,804,170  
Accumulated amortization (8,537,949) (7,652,149)  
Net 18,337,459 17,152,021  
Program Contract Commitments [Member]      
IfrsStatementLineItems [Line Items]      
Cost 1,709,757 1,709,757  
Accumulated amortization (444,765) (391,800)  
Net 1,264,992 1,317,957  
Service Contracts Commitments [Member]      
IfrsStatementLineItems [Line Items]      
Cost 25,584,703 22,834,803  
Accumulated amortization (7,714,252) (6,676,032)  
Net 17,870,451 16,158,771 R$ 14,390,763
Software Licenses [Member]      
IfrsStatementLineItems [Line Items]      
Cost 1,249,881 1,133,833  
Accumulated amortization (654,477) (535,099)  
Net 595,404 598,734  
Right Of Uses [Member]      
IfrsStatementLineItems [Line Items]      
Cost 170,921 173,715  
Accumulated amortization (95,869) (69,862)  
Net 75,052 103,853  
Right Of Uses Investments [Member]      
IfrsStatementLineItems [Line Items]      
Cost 26,148  
Accumulated amortization  
Net R$ 26,148