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7 Trade Accounts Receivable (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable R$ 3,182,567 R$ 3,107,006
Current 3,120,168 2,944,091
Noncurrent 62,399 162,915
Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 2,697,862  
Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 386,761  
Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 97,944  
CCEE [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 119,665  
Customers [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 2,498,744 2,487,806
Customers [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 1,831,011  
Customers [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 370,051  
Customers [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 297,682  
Customers [Member] | Residential [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 579,715 584,621
Customers [Member] | Residential [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 346,883  
Customers [Member] | Residential [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 203,471  
Customers [Member] | Residential [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 29,361  
Customers [Member] | Industrial [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 298,719 365,020
Customers [Member] | Industrial [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 184,959  
Customers [Member] | Industrial [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 30,440  
Customers [Member] | Industrial [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 83,320  
Customers [Member] | Commercial [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 363,986 372,914
Customers [Member] | Commercial [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 271,065  
Customers [Member] | Commercial [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 63,557  
Customers [Member] | Commercial [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 29,364  
Customers [Member] | Rural [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 103,271 89,634
Customers [Member] | Rural [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 77,716  
Customers [Member] | Rural [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 20,419  
Customers [Member] | Rural [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 5,136  
Customers [Member] | Public Entities [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 55,847 56,920
Customers [Member] | Public Entities [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 44,608  
Customers [Member] | Public Entities [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 7,523  
Customers [Member] | Public Entities [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 3,716  
Customers [Member] | Public Lighting [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 38,523 39,114
Customers [Member] | Public Lighting [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 38,470  
Customers [Member] | Public Lighting [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 51  
Customers [Member] | Public Lighting [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 2  
Customers [Member] | Public Service [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 44,983 42,702
Customers [Member] | Public Service [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 43,660  
Customers [Member] | Public Service [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 882  
Customers [Member] | Public Service [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 441  
Customers [Member] | Unbilled - captives [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 516,203 478,328
Customers [Member] | Unbilled - captives [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 516,203  
Customers [Member] | Unbilled - captives [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable  
Customers [Member] | Unbilled - captives [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable  
Customers [Member] | Energy Installments Plan - captives [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 204,192 197,951
Customers [Member] | Energy Installments Plan - captives [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 124,151  
Customers [Member] | Energy Installments Plan - captives [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 16,280  
Customers [Member] | Energy Installments Plan - captives [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 63,761  
Customers [Member] | Low Income Subsidy-Eletrobras [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 12,174 11,958
Customers [Member] | Low Income Subsidy-Eletrobras [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 12,174  
Customers [Member] | Low Income Subsidy-Eletrobras [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable  
Customers [Member] | Low Income Subsidy-Eletrobras [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable  
Customers [Member] | Other Receivables [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 148,375 138,116
Customers [Member] | Other Receivables [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 42,433  
Customers [Member] | Other Receivables [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 23,362  
Customers [Member] | Other Receivables [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 82,580  
Customers [Member] | Free Consumers [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 132,756 110,528
Customers [Member] | Free Consumers [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 128,689  
Customers [Member] | Free Consumers [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 4,066  
Customers [Member] | Free Consumers [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 1  
Concessionaires, Permission holder and Trading Companies [Member] | Regulated contracts [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 159,492 66,294
Concessionaires, Permission holder and Trading Companies [Member] | Regulated contracts [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 148,410  
Concessionaires, Permission holder and Trading Companies [Member] | Regulated contracts [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 4,289  
Concessionaires, Permission holder and Trading Companies [Member] | Regulated contracts [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 6,793  
Concessionaires, Permission holder and Trading Companies [Member] | Bilateral Contracts [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 191,463 186,252
Concessionaires, Permission holder and Trading Companies [Member] | Bilateral Contracts [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 183,973  
Concessionaires, Permission holder and Trading Companies [Member] | Bilateral Contracts [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 74  
Concessionaires, Permission holder and Trading Companies [Member] | Bilateral Contracts [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 7,416  
Concessionaires, Permission holder and Trading Companies [Member] | CCEE [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 315,712 323,657
Concessionaires, Permission holder and Trading Companies [Member] | CCEE [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 196,047  
Concessionaires, Permission holder and Trading Companies [Member] | CCEE [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable  
Concessionaires, Permission holder and Trading Companies [Member] | CCEE [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 119,665  
Concessionaires, Permission holder and Trading Companies [Member] | Energy Suplies [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 666,667 576,203
Concessionaires, Permission holder and Trading Companies [Member] | Energy Suplies [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 528,430  
Concessionaires, Permission holder and Trading Companies [Member] | Energy Suplies [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 4,363  
Concessionaires, Permission holder and Trading Companies [Member] | Energy Suplies [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 133,874  
Concessionaires, Permission holder and Trading Companies [Member] | Charges From Using Transmission Grid [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 215,582 208,060
Concessionaires, Permission holder and Trading Companies [Member] | Charges From Using Transmission Grid [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 203,125  
Concessionaires, Permission holder and Trading Companies [Member] | Charges From Using Transmission Grid [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 4,511  
Concessionaires, Permission holder and Trading Companies [Member] | Charges From Using Transmission Grid [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 7,946  
Telecommunications [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 67,304 62,985
Telecommunications [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 50,752  
Telecommunications [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 10,094  
Telecommunications [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 6,458  
Gas Distribution [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 111,026 103,340
Gas Distribution [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 90,510  
Gas Distribution [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 9,228  
Gas Distribution [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable 11,288  
Expected Credit Losses [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable (376,756) R$ (331,388)
Expected Credit Losses [Member] | Balance Falling Due [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable (5,966)  
Expected Credit Losses [Member] | Overdue Up To 90 Days [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable (11,486)  
Expected Credit Losses [Member] | Less Than 1 Year [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade Accounts Receivable R$ (359,304)