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31. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Assets R$ 4,058    
Financial liabilities   R$ 18,764  
Financial liabilities at amortised cost, class [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1] 9,693    
Financial assets at fair value [1] 9,693    
Financial liabilities [1] (18,872)    
Financial liabilities at fair value [1] (18,872)    
Financial liabilities at fair value through profit or loss, category [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1] (536)    
Financial liabilities at fair value [1] (536)    
Loans, financing and debentures [member] | Level 2 [member] | Financial liabilities at amortised cost, class [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1] (15,020)    
Financial liabilities at fair value [1] (15,020)    
Debt with pension fund (forluz) [member] | Level 2 [member] | Financial liabilities at amortised cost, class [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1] (473)    
Financial liabilities at fair value [1] (473)    
Deficit of pension fund (forluz) [member] | Level 2 [member] | Financial liabilities at amortised cost, class [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1] (540)    
Financial liabilities at fair value [1] (540)    
Concessions payable [member] | Level 3 [member] | Financial liabilities at amortised cost, class [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1] (23)    
Financial liabilities at fair value [1] (23)    
Suppliers [member] | Level 2 [member] | Financial liabilities at amortised cost, class [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1] (2,358)    
Financial liabilities at fair value [1] (2,358)    
Leasing transactions [member] | Level 2 [member] | Financial liabilities at amortised cost, class [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1] (227)    
Financial liabilities at fair value [1] (227)    
Sector financial liabilities [member] | Level 2 [member] | Financial liabilities at amortised cost, class [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1] (231)    
Financial liabilities at fair value [1] (231)    
Restated [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets   4,650 R$ 4,702
Restated [member] | Financial liabilities at amortised cost, class [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1]   10,847  
Financial assets at fair value [1]   10,847  
Financial liabilities [1]   (18,281)  
Financial liabilities at fair value [1]   (18,281)  
Restated [member] | Financial liabilities at fair value through profit or loss, category [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1]   (483)  
Financial liabilities at fair value [1]   (483)  
Restated [member] | Loans, financing and debentures [member] | Level 2 [member] | Financial liabilities at amortised cost, class [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1]   (14,777)  
Financial liabilities at fair value [1]   (14,777)  
Restated [member] | Debt with pension fund (forluz) [member] | Level 2 [member] | Financial liabilities at amortised cost, class [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1]   (566)  
Financial liabilities at fair value [1]   (566)  
Restated [member] | Deficit of pension fund (forluz) [member] | Level 2 [member] | Financial liabilities at amortised cost, class [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1]   (550)  
Financial liabilities at fair value [1]   (550)  
Restated [member] | Concessions payable [member] | Level 3 [member] | Financial liabilities at amortised cost, class [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1]   (20)  
Financial liabilities at fair value [1]   (20)  
Restated [member] | Leasing transactions [member] | Level 2 [member] | Financial liabilities at amortised cost, class [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1]   (288)  
Financial liabilities at fair value [1]   (288)  
Restated [member] | Sector financial liabilities [member] | Level 2 [member] | Financial liabilities at amortised cost, class [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1]    
Financial liabilities at fair value [1]    
Derivative financial instruments [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets 8,825    
Financial assets at fair value 8,825    
Financial liabilities (19,408)    
Financial liabilities at fair value (19,408)    
Derivative financial instruments [member] | Indemnifiable receivable generation [member] | Level 3 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets 816    
Financial assets at fair value 816    
Derivative financial instruments [member] | Concession financial assets - distribution infrastructure [member] | Level 3 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets 559    
Financial assets at fair value 559    
Derivative financial instruments [member] | Derivative financial instrument assets, ativas and sonda put options [member] | Level 3 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets 3    
Financial assets at fair value 3    
Derivative financial instruments [member] | Derivative financial instrument assets, swaps [member] | Level 3 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets 2,949    
Financial assets at fair value 2,949    
Derivative financial instruments [member] | Restated [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets   3,971  
Financial assets at fair value   3,971  
Financial liabilities   (18,764)  
Financial liabilities at fair value   (18,764)  
Derivative financial instruments [member] | Restated [member] | Indemnifiable receivable generation [member] | Level 3 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets   816  
Financial assets at fair value   816  
Derivative financial instruments [member] | Restated [member] | Concession financial assets - distribution infrastructure [member] | Level 3 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets   484  
Financial assets at fair value   484  
Derivative financial instruments [member] | Restated [member] | Derivative financial instrument assets, ativas and sonda put options [member] | Level 3 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets   3  
Financial assets at fair value   3  
Derivative financial instruments [member] | Restated [member] | Derivative financial instrument assets, swaps [member] | Level 3 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets   1,691  
Financial assets at fair value   1,691  
Financial assets at amortised cost, class [member] | Concession grant fee generation concessions [member] | Level 3 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1] 2,549    
Financial assets at fair value [1] 2,549    
Financial assets at amortised cost, class [member] | Escrow deposits [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1] 1,056    
Financial assets at fair value [1] 1,056    
Financial assets at amortised cost, class [member] | Low income subsidy [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1] 43    
Financial assets at fair value [1] 43    
Financial assets at amortised cost, class [member] | Reimbursement of tariff subsidy [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1] 88    
Financial assets at fair value [1] 88    
Financial assets at amortised cost, class [member] | Concession financial assets CVA account and other financial components in tariff adjustments [member] | Level 3 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1] 133    
Financial assets at fair value [1] 133    
Financial assets at amortised cost, class [member] | Restricted cash [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1] 64    
Financial assets at fair value [1] 64    
Financial assets at amortised cost, class [member] | Accounts receivable from customers and traders concession holders (transmission service) [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1] 4,534    
Financial assets at fair value [1] 4,534    
Financial assets at amortised cost, class [member] | Accounts receivable from the state of minas gerais [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1] 12    
Financial assets at fair value [1] 12    
Financial assets at amortised cost, class [member] | Marketable securities - cash investments [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1] 1,214    
Financial assets at fair value [1] 1,214    
Financial assets at amortised cost, class [member] | Restated [member] | Concession grant fee generation concessions [member] | Level 3 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1]   2,468  
Financial assets at fair value [1]   2,468  
Financial assets at amortised cost, class [member] | Restated [member] | Escrow deposits [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1]   2,540  
Financial assets at fair value [1]   2,540  
Financial assets at amortised cost, class [member] | Restated [member] | Low income subsidy [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1]   30  
Financial assets at fair value [1]   30  
Financial assets at amortised cost, class [member] | Restated [member] | Reimbursement of tariff subsidy [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1]   97  
Financial assets at fair value [1]   97  
Financial assets at amortised cost, class [member] | Restated [member] | Concession financial assets CVA account and other financial components in tariff adjustments [member] | Level 3 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1]   882  
Financial assets at fair value [1]   882  
Financial assets at amortised cost, class [member] | Restated [member] | Restricted cash [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1]   12  
Financial assets at fair value [1]   12  
Financial assets at amortised cost, class [member] | Restated [member] | Accounts receivable from customers and traders concession holders (transmission service) [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1]   4,601  
Financial assets at fair value [1]   4,601  
Financial assets at amortised cost, class [member] | Restated [member] | Accounts receivable from the state of minas gerais [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1]   115  
Financial assets at fair value [1]   115  
Financial assets at amortised cost, class [member] | Restated [member] | Marketable securities - cash investments [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets [1]   102  
Financial assets at fair value [1]   102  
Financial assets at amortised cost, class [member] | Restated [member] | Suppliers [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities [1]   (2,080)  
Financial liabilities at fair value [1]   (2,080)  
Financial assets at fair value through profit or loss, category [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets 18,518    
Financial assets at fair value 18,518    
Financial assets at fair value through profit or loss, category [member] | Marketable securities - bank financial notes [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets 1,635    
Financial assets at fair value 1,635    
Financial assets at fair value through profit or loss, category [member] | Marketable securities - treasury financial notes [member] | Level 1 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets 731    
Financial assets at fair value 731    
Financial assets at fair value through profit or loss, category [member] | Marketable securities - bank certificates of deposit (CDBs) [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets 545    
Financial assets at fair value 545    
Financial assets at fair value through profit or loss, category [member] | Cash equivalents investments [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets 1,587    
Financial assets at fair value 1,587    
Financial assets at fair value through profit or loss, category [member] | Restated [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets   14,818  
Financial assets at fair value   14,818  
Financial assets at fair value through profit or loss, category [member] | Restated [member] | Marketable securities - bank financial notes [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets   557  
Financial assets at fair value   557  
Financial assets at fair value through profit or loss, category [member] | Restated [member] | Marketable securities - treasury financial notes [member] | Level 1 [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets   94  
Financial assets at fair value   94  
Financial assets at fair value through profit or loss, category [member] | Restated [member] | Marketable securities - bank certificates of deposit (CDBs) [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets    
Financial assets at fair value    
Financial assets at fair value through profit or loss, category [member] | Restated [member] | Cash equivalents investments [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets   326  
Financial assets at fair value   326  
Marketable securities [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets 4,498    
Financial assets at fair value 4,498    
Marketable securities [member] | Restated [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets   977  
Financial assets at fair value   977  
Financial liabilities at fair value through profit or loss, category [member] | Derivative financial instruments (SAAG put options) [member] | Level 3 [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities (536)    
Financial liabilities at fair value (536)    
Financial liabilities at fair value through profit or loss, category [member] | Restated [member] | Derivative financial instruments (SAAG put options) [member] | Level 3 [member]      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities   (483)  
Financial liabilities at fair value   (483)  
Financial assets at fair value through profit or loss, category [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets 4,498    
Financial assets at fair value R$ 4,498    
Financial assets at fair value through profit or loss, category [member] | Restated [member]      
Disclosure of detailed information about financial instruments [line items]      
Assets   977  
Financial assets at fair value   R$ 977  
[1] On December 31, 2020 and 2019, the book values of financial instruments reflect their fair values.