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Schedule of changes in provisions for litigation (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Provisions for legal claims, beginning R$ 1,555,704 R$ 1,606,713
Provision for litigations, additions 272,306 278,349
Provision for litigations, reversals (78,577) (121,856)
Construction cost, additions/(rev.) 8,434 (7,075)
Additions to assets 49,714 5,869
Settlement (210,085) (172,025)
Transfers/others (131) (34,271)
Provisions for legal claims, ending 1,597,365 1,555,704
Tax [Member]    
IfrsStatementLineItems [Line Items]    
Provisions for legal claims, beginning 173,873 175,790
Provision for litigations, additions 14,169 50,813
Provision for litigations, reversals (1,417) (49,381)
Construction cost, additions/(rev.)  
Additions to assets  
Settlement (127) (244)
Transfers/others (5,383) (3,105)
Provisions for legal claims, ending 181,115 173,873
Tax [Member] | Cofins [Member]    
IfrsStatementLineItems [Line Items]    
Provisions for legal claims, beginning 107,148 104,284
Provision for litigations, additions 4,123 2,864
Provision for litigations, reversals (1,212)  
Construction cost, additions/(rev.)  
Additions to assets  
Settlement  
Transfers/others  
Provisions for legal claims, ending 110,059 107,148
Tax [Member] | Others [Member]    
IfrsStatementLineItems [Line Items]    
Provisions for legal claims, beginning 66,725 71,506
Provision for litigations, additions 10,046 47,949
Provision for litigations, reversals (205) (49,381)
Construction cost, additions/(rev.)  
Additions to assets  
Settlement (127) (244)
Transfers/others (5,383) (3,105)
Provisions for legal claims, ending 71,056 66,725
Labors [Member]    
IfrsStatementLineItems [Line Items]    
Provisions for legal claims, beginning 596,248 673,062
Provision for litigations, additions 94,845 102,315
Provision for litigations, reversals (21,647) (4,297)
Construction cost, additions/(rev.)  
Additions to assets  
Settlement (105,777) (145,228)
Transfers/others 6,087 (29,604)
Provisions for legal claims, ending 569,756 596,248
Employee Benefits [Member]    
IfrsStatementLineItems [Line Items]    
Provisions for legal claims, beginning 52,401 86,297
Provision for litigations, additions 4,685 11,439
Provision for litigations, reversals (19,623) (43,524)
Construction cost, additions/(rev.)  
Additions to assets  
Settlement (761) (783)
Transfers/others 446 (1,028)
Provisions for legal claims, ending 37,148 52,401
Civil [Member]    
IfrsStatementLineItems [Line Items]    
Provisions for legal claims, beginning 644,483 591,756
Provision for litigations, additions 137,913 102,827
Provision for litigations, reversals (29,919) (23,621)
Construction cost, additions/(rev.) 8,434 (7,075)
Additions to assets 49,714 5,869
Settlement (103,153) (24,739)
Transfers/others (1,281) (534)
Provisions for legal claims, ending 706,191 644,483
Civil [Member] | Civil And Administrative Claims [Member]    
IfrsStatementLineItems [Line Items]    
Provisions for legal claims, beginning 387,895 336,962
Provision for litigations, additions 129,730 94,500
Provision for litigations, reversals (9,218) (20,581)
Construction cost, additions/(rev.)  
Additions to assets  
Settlement (74,989) (22,452)
Transfers/others 19 (534)
Provisions for legal claims, ending 433,437 387,895
Civil [Member] | Easements [Member]    
IfrsStatementLineItems [Line Items]    
Provisions for legal claims, beginning 111,553 127,010
Provision for litigations, additions 1,616 286
Provision for litigations, reversals (543)
Construction cost, additions/(rev.) 15,702 (13,748)
Additions to assets 36,771 667
Settlement (27,573) (2,119)
Transfers/others  
Provisions for legal claims, ending 138,069 111,553
Civil [Member] | Expropriations And Property [Member]    
IfrsStatementLineItems [Line Items]    
Provisions for legal claims, beginning 133,888 118,757
Provision for litigations, additions 680 4,634
Provision for litigations, reversals (15,031) (1,217)
Construction cost, additions/(rev.) (7,268) 6,673
Additions to assets 12,943 5,202
Settlement (184) (161)
Transfers/others  
Provisions for legal claims, ending 125,028 133,888
Civil [Member] | Customers [Member]    
IfrsStatementLineItems [Line Items]    
Provisions for legal claims, beginning 3,973 4,956
Provision for litigations, additions 895 299
Provision for litigations, reversals (706) (1,275)
Construction cost, additions/(rev.)  
Additions to assets  
Settlement (407) (7)
Transfers/others  
Provisions for legal claims, ending 3,755 3,973
Civil [Member] | Environmental [Member]    
IfrsStatementLineItems [Line Items]    
Provisions for legal claims, beginning 7,174 4,071
Provision for litigations, additions 4,992 3,108
Provision for litigations, reversals (4,964) (5)
Construction cost, additions/(rev.)  
Additions to assets  
Settlement
Transfers/others (1,300)  
Provisions for legal claims, ending 5,902 7,174
Regulatory [Member]    
IfrsStatementLineItems [Line Items]    
Provisions for legal claims, beginning 88,699 79,808
Provision for litigations, additions 20,694 10,955
Provision for litigations, reversals (5,971) (1,033)
Construction cost, additions/(rev.)  
Additions to assets  
Settlement (267) (1,031)
Transfers/others  
Provisions for legal claims, ending R$ 103,155 R$ 88,699