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12 FINANCIAL INSTRUMENTS (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Total current financial assets at fair value through profit or loss R$ 5,398 R$ 4,854
Total current financial assets at amortised cost 5,814,613 5,270,745
Total current financial assets 5,820,011 5,275,599
Total non-current financial assets at fair value through profit or loss 51,503 2,279,189
Total non-current financial assets at amortised cost 1,794,362 1,535,256
Total non-current financial assets 1,845,865 3,814,445
Total financial assets at fair value through profit or loss 56,901 2,284,043
Total financial assets at amortised cost 7,608,975 6,806,001
Total financial assets 7,665,876 9,090,044
Total current financial liabilities at amortised cost 9,334,492 10,087,624
Total current financial liabilities 9,334,492 10,087,624
Total non-current financial liabilities at amortised cost 23,377,819 23,260,944
Total non-current financial liabilities 23,377,819 23,260,944
Total financial liabilities at amortised cost 32,712,311 33,348,568
Total financial liabilities 32,712,311 33,348,568
Borrowings And Financing [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total current financial liabilities at amortised cost 5,152,234 5,681,797
Total current financial liabilities 5,152,234 5,681,797
Total financial liabilities at amortised cost 22,938,469 23,260,944
Total financial liabilities 22,938,469 23,260,944
Leases [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total current financial liabilities at amortised cost 35,040  
Total current financial liabilities 35,040  
Total financial liabilities at amortised cost 439,350  
Total financial liabilities 439,350  
Trade payables    
Disclosure of detailed information about financial instruments [line items]    
Total current financial liabilities at amortised cost 3,012,654 3,408,056
Total current financial liabilities 3,012,654 3,408,056
Trade Payables - Drawee Risk [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total current financial liabilities at amortised cost 1,121,312 65,766
Total current financial liabilities 1,121,312 65,766
Dividends And Interest On Equity [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total current financial liabilities at amortised cost 13,252 932,005
Total current financial liabilities 13,252 932,005
Cash And Cash Equivalants [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total current financial assets at amortised cost 1,088,955 2,248,004
Total current financial assets 1,088,955 2,248,004
Financial Investments [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total current financial assets at amortised cost 2,633,173 895,713
Total current financial assets 2,633,173 895,713
Total non-current financial assets at amortised cost 95,719 7,772
Total non-current financial assets 95,719 7,772
Trade Receivables [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total current financial assets at amortised cost 2,047,931 2,078,182
Total current financial assets 2,047,931 2,078,182
Dividends Receivable [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total current financial assets at amortised cost 44,554 46,171
Total current financial assets 44,554 46,171
Derivative Financial Instruments [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total current financial assets at fair value through profit or loss 1,364 351
Total current financial assets 1,364 351
Total non-current financial assets at fair value through profit or loss 4,203  
Total non-current financial assets 4,203  
Trading Securities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total current financial assets at fair value through profit or loss 4,034 4,503
Total current financial assets 4,034 4,503
Loans - Related Parties [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total current financial assets at amortised cost   2,675
Total current financial assets   2,675
Total non-current financial assets at amortised cost 846,300 706,605
Total non-current financial assets 846,300 706,605
Other Trade Receivables [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total non-current financial assets at amortised cost 7,059 7,451
Total non-current financial assets 7,059 7,451
Compulsory Loan - Eletrobras [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total non-current financial assets at amortised cost 845,284 813,428
Total non-current financial assets 845,284 813,428
Investments [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total non-current financial assets at fair value through profit or loss 47,300 2,279,189
Total non-current financial assets R$ 47,300 R$ 2,279,189