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31. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 10) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
ASSETS      
Concession financial assets related to Distribution infrastructure - IPCA R$ 559 [1] R$ 484 [2]  
Accounts receivable from Minas Gerais state government (AFAC) - IGPM index 12    
Concession Grant Fee - IPCA 2,549 2,468  
Assets 54,083 50,526 [3] R$ 59,855
LIABILITIES      
Loans, financing and debentures - IPCA and IGP-DI (4,863) (4,730)  
Debt agreed with pension fund (Forluz) - IPCA (473)    
Deficit of pension plan (Forluz) (540) (550)  
Liabilities (36,605) R$ 34,423 [3]  
Net liability exposed (5,876)    
Net effect of fluctuation in IPCA and IGP-M indices (2,756)    
Probable scenario [member] | IPCA [member]      
ASSETS      
Concession financial assets related to Distribution infrastructure - IPCA [2] 584    
Accounts receivable from Minas Gerais state government (AFAC) - IGPM index 13    
Concession Grant Fee - IPCA 2,664    
Assets 3,261    
LIABILITIES      
Loans, financing and debentures - IPCA and IGP-DI (5,083)    
Debt agreed with pension fund (Forluz) - IPCA (494)    
Deficit of pension plan (Forluz) (564)    
Liabilities (6,141)    
Net liability exposed (2,880)    
Net effect of fluctuation in IPCA and IGP-M indices (124)    
Probable scenario (25%) [member] | IPCA [member]      
ASSETS      
Concession financial assets related to Distribution infrastructure - IPCA [2] 591    
Accounts receivable from Minas Gerais state government (AFAC) - IGPM index 14    
Concession Grant Fee - IPCA 2,693    
Assets 3,298    
LIABILITIES      
Loans, financing and debentures - IPCA and IGP-DI (5,138)    
Debt agreed with pension fund (Forluz) - IPCA (500)    
Deficit of pension plan (Forluz) (571)    
Liabilities (6,209)    
Net liability exposed (2,911)    
Net effect of fluctuation in IPCA and IGP-M indices (155)    
Remote scenario -50% [member] | IPCA [member]      
ASSETS      
Concession financial assets related to Distribution infrastructure - IPCA [2] 597    
Accounts receivable from Minas Gerais state government (AFAC) - IGPM index 14    
Concession Grant Fee - IPCA 2,722    
Assets 3,333    
LIABILITIES      
Loans, financing and debentures - IPCA and IGP-DI (5,194)    
Debt agreed with pension fund (Forluz) - IPCA (505)    
Deficit of pension plan (Forluz) (577)    
Liabilities (6,276)    
Net liability exposed (2,943)    
Net effect of fluctuation in IPCA and IGP-M indices R$ (187)    
[1] Portion of the concession financial assets relating to the Regulatory Remuneration Base of Assets ratified by the grantor (Aneel) after the 4rd tariff review cycle.
[2] Portion of the Concession financial assets relating to the Regulatory Remuneration Base of Assets ratified by the regulator (Aneel) after the 4rd tariff review cycle.
[3] See note 2.8.