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Schedule of risk of increase in inflation (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Assets    
Concession financial assets  related to Distribution infrastructure - IPCA (1) R$ 718 R$ 559
Receivable from Minas Gerais state government (AFAC) – IGPM (Note 11 and 30) 13 12
Concession Grant Fee – IPCA (Note 14) 2,792 2,549
 Assets 3,523 3,120
Liabilities    
Loans, financing and debentures – IPCA and IGP-DI (Note 22) (4,322) (4,863)
Debt with pension fund (Forluz) – IPCA (Note 24) (385) (473)
Deficit of pension plan (Forluz) – IPCA (Note 24) (539) (540)
 Liabilities (5,246) (5,876)
Net assets (liabilities) exposed R$ (1,723) R$ (2,756)