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29 Provisions for Legal Claims and Contingent Liabilities (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
DisclosureOfProvisionsForLegalClaimsAndContingentLiabilitiesLineItems [Line Items]    
Provisions for legal claims, beginning R$ 1,606,713 R$ 1,664,773
Provision for litigations, additions 278,349 345,765
Provision for litigations, reversals (121,856) (81,651)
Construction cost, additions/(rev.) (7,075) 9,521
Additions to assets 5,869 8,121
Discharges (172,025) (367,548)
Transfers/others (34,271) [1] 27,732
Provisions for legal claims, ending 1,555,704 1,606,713
Tax [member]    
DisclosureOfProvisionsForLegalClaimsAndContingentLiabilitiesLineItems [Line Items]    
Provisions for legal claims, beginning 175,790 157,097
Provision for litigations, additions 50,813 9,148
Provision for litigations, reversals (49,381) (16,884)
Construction cost, additions/(rev.)
Additions to assets
Discharges (244) (1,258)
Transfers/others (3,105) [1] 27,687
Provisions for legal claims, ending 173,873 175,790
Tax [member] | Cofins [member]    
DisclosureOfProvisionsForLegalClaimsAndContingentLiabilitiesLineItems [Line Items]    
Provisions for legal claims, beginning 104,284 102,603
Provision for litigations, additions 2,864 4,307
Provision for litigations, reversals (2,626)
Construction cost, additions/(rev.)
Additions to assets
Discharges
Transfers/others [1]
Provisions for legal claims, ending 107,148 104,284
Tax [member] | Others [member]    
DisclosureOfProvisionsForLegalClaimsAndContingentLiabilitiesLineItems [Line Items]    
Provisions for legal claims, beginning 71,506 54,494
Provision for litigations, additions 47,949 4,841
Provision for litigations, reversals (49,381) (14,258)
Construction cost, additions/(rev.)
Additions to assets
Discharges (244) (1,258)
Transfers/others (3,105) [1] 27,687
Provisions for legal claims, ending 66,725 71,506
Labors [member]    
DisclosureOfProvisionsForLegalClaimsAndContingentLiabilitiesLineItems [Line Items]    
Provisions for legal claims, beginning 673,062 612,782
Provision for litigations, additions 102,315 194,550
Provision for litigations, reversals (4,297) (23)
Construction cost, additions/(rev.)
Additions to assets
Discharges (145,228) (134,247)
Transfers/others (29,604) [1]
Provisions for legal claims, ending 596,248 673,062
Employee Benefits [member]    
DisclosureOfProvisionsForLegalClaimsAndContingentLiabilitiesLineItems [Line Items]    
Provisions for legal claims, beginning 86,297 85,199
Provision for litigations, additions 11,439 27,426
Provision for litigations, reversals (43,524) (18,747)
Construction cost, additions/(rev.)
Additions to assets
Discharges (783) (7,581)
Transfers/others (1,028) [1]
Provisions for legal claims, ending 52,401 86,297
Civil [member]    
DisclosureOfProvisionsForLegalClaimsAndContingentLiabilitiesLineItems [Line Items]    
Provisions for legal claims, beginning 591,756 736,222
Provision for litigations, additions 102,827 106,715
Provision for litigations, reversals (23,621) (45,451)
Construction cost, additions/(rev.) (7,075) 9,521
Additions to assets 5,869 8,121
Discharges (24,739) (223,417)
Transfers/others (534) [1] 45
Provisions for legal claims, ending 644,483 591,756
Civil [member] | Civil And Administrative Claims [member]    
DisclosureOfProvisionsForLegalClaimsAndContingentLiabilitiesLineItems [Line Items]    
Provisions for legal claims, beginning 336,962 492,934
Provision for litigations, additions 94,500 101,438
Provision for litigations, reversals (20,581) (36,271)
Construction cost, additions/(rev.)
Additions to assets
Discharges (22,452) (221,139)
Transfers/others (534) [1]
Provisions for legal claims, ending 387,895 336,962
Civil [member] | Easements [member]    
DisclosureOfProvisionsForLegalClaimsAndContingentLiabilitiesLineItems [Line Items]    
Provisions for legal claims, beginning 127,010 118,147
Provision for litigations, additions 286 711
Provision for litigations, reversals (543) (3,470)
Construction cost, additions/(rev.) (13,748) 12,456
Additions to assets 667 1,012
Discharges (2,119) (1,891)
Transfers/others [1] 45
Provisions for legal claims, ending 111,553 127,010
Civil [member] | Expropriations And Property [member]    
DisclosureOfProvisionsForLegalClaimsAndContingentLiabilitiesLineItems [Line Items]    
Provisions for legal claims, beginning 118,757 116,401
Provision for litigations, additions 4,634 2,844
Provision for litigations, reversals (1,217) (4,501)
Construction cost, additions/(rev.) 6,673 (2,935)
Additions to assets 5,202 7,109
Discharges (161) (161)
Transfers/others [1]
Provisions for legal claims, ending 133,888 118,757
Civil [member] | Customers [member]    
DisclosureOfProvisionsForLegalClaimsAndContingentLiabilitiesLineItems [Line Items]    
Provisions for legal claims, beginning 4,956 5,209
Provision for litigations, additions 299 390
Provision for litigations, reversals (1,275) (643)
Construction cost, additions/(rev.)
Additions to assets
Discharges (7)
Transfers/others [1]
Provisions for legal claims, ending 3,973 4,956
Civil [member] | Environmental [member]    
DisclosureOfProvisionsForLegalClaimsAndContingentLiabilitiesLineItems [Line Items]    
Provisions for legal claims, beginning 4,071 3,531
Provision for litigations, additions 3,108 1,332
Provision for litigations, reversals (5) (226)
Construction cost, additions/(rev.)
Additions to assets
Discharges (566)
Transfers/others [1]
Provisions for legal claims, ending 7,174 4,071
Regulatory [member]    
DisclosureOfProvisionsForLegalClaimsAndContingentLiabilitiesLineItems [Line Items]    
Provisions for legal claims, beginning 79,808 73,473
Provision for litigations, additions 10,955 7,926
Provision for litigations, reversals (1,033) (546)
Construction cost, additions/(rev.)  
Additions to assets  
Discharges (1,031) (1,045)
Transfers/others [1]
Provisions for legal claims, ending R$ 88,699 R$ 79,808
[1] Reclassification mainly to Liabilities associated with assets classified as held for sale (Note 40).