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Schedule of exposure to exchange rates Risk (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Assets    
Concession financial assets  related to Distribution infrastructure – IPCA (1)   R$ 718
Accounts receivable from Minas Gerais state government (AFAC) – IGPM index (Note 11 and 30)   13
Concession Grant Fee – IPCA (Note 14)   2,792
 Assets   3,523
Liabilities    
Loans, financing and debentures – IPCA and IGP-DI (Note 22)   (4,322)
Debt agreed with pension fund (Forluz) – IPCA (Note 24)   (385)
Deficit of pension plan (Forluz)  (Note 24)   (539)
 Liabilities   (5,246)
Net liability exposed   R$ (1,723)
Probable Ccenario [Member] | I P C A [Member]    
Assets    
Concession financial assets  related to Distribution infrastructure – IPCA (1) R$ 766  
Accounts receivable from Minas Gerais state government (AFAC) – IGPM index (Note 11 and 30) 14  
Concession Grant Fee – IPCA (Note 14) 2,979  
 Assets 3,759  
Liabilities    
Loans, financing and debentures – IPCA and IGP-DI (Note 22) (4,611)  
Debt agreed with pension fund (Forluz) – IPCA (Note 24) (411)  
Deficit of pension plan (Forluz)  (Note 24) (575)  
 Liabilities (5,597)  
Net liability exposed (1,838)  
Net effect of fluctuation in IPCA and IGP–M indexes (115)  
Probable Ccenario [Member] | I P C A One [Member]    
Assets    
Concession financial assets  related to Distribution infrastructure – IPCA (1) 778  
Accounts receivable from Minas Gerais state government (AFAC) – IGPM index (Note 11 and 30) 15  
Concession Grant Fee – IPCA (Note 14) 3,025  
 Assets 3,818  
Liabilities    
Loans, financing and debentures – IPCA and IGP-DI (Note 22) (4,683)  
Debt agreed with pension fund (Forluz) – IPCA (Note 24) (417)  
Deficit of pension plan (Forluz)  (Note 24) (584)  
 Liabilities (5,684)  
Net liability exposed (1,866)  
Net effect of fluctuation in IPCA and IGP–M indexes (143)  
Probable Ccenario [Member] | I P C A Three [Member]    
Assets    
Concession financial assets  related to Distribution infrastructure – IPCA (1) 790  
Accounts receivable from Minas Gerais state government (AFAC) – IGPM index (Note 11 and 30) 15  
Concession Grant Fee – IPCA (Note 14) 3,072  
 Assets 3,877  
Liabilities    
Loans, financing and debentures – IPCA and IGP-DI (Note 22) (4,755)  
Debt agreed with pension fund (Forluz) – IPCA (Note 24) (424)  
Deficit of pension plan (Forluz)  (Note 24) (593)  
 Liabilities (5,772)  
Net liability exposed (1,895)  
Net effect of fluctuation in IPCA and IGP–M indexes R$ (172)