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31. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 9) - 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]  
Receivable from Minas Gerais state government (AFAC) - IGPM 12 115  
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 with pension fund (Forluz) - IPCA (473) (566)  
Deficit of pension plan (Forluz) - IPCA (540) (550)  
Liabilities (36,605) 34,423 [3]  
Net assets (liabilities) exposed R$ 3,295 R$ (2,779)  
[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.