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Financial Instruments and Risk Management - Schedule of Exposure to Exchange Rates Risk (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Assets      
Concession financial assets related to Distribution infrastructure - IPCA R$ 1,920 R$ 1,407  
Concession Grant Fee - IPCA (Note 14) 3,031 2,950  
Assets 55,000 53,671  
Liabilities      
Loans and debentures - IPCA and IGP-DI (Note 22) (4,522) (4,630)  
Deficit of pension plan (Forluz) (Note 24) (521) (545)  
Leasing liabilities (433) (354) R$ (244)
Liabilities (30,344) R$ (31,887)  
IPCA [member] | Amount Book Value [Member]      
Assets      
Concession financial assets related to Distribution infrastructure - IPCA [1] 1,882    
Concession financial assets related to gas distribution infrastructure - IGPM 39    
Concession Grant Fee - IPCA (Note 14) 3,031    
Assets 4,952    
Liabilities      
Loans and debentures - IPCA and IGP-DI (Note 22) (4,522)    
Debt agreed with pension fund (Forluz) - IPCA (Note 24) (90)    
Deficit of pension plan (Forluz) (Note 24) (521)    
Leasing liabilities (433)    
Liabilities (5,566)    
Net liabilities exposed (614)    
IPCA [member] | Probable Ccenario [Member]      
Assets      
Concession financial assets related to Distribution infrastructure - IPCA [1] 1,961    
Concession financial assets related to gas distribution infrastructure - IGPM 40    
Concession Grant Fee - IPCA (Note 14) 3,159    
Assets 5,160    
Liabilities      
Loans and debentures - IPCA and IGP-DI (Note 22) (4,713)    
Debt agreed with pension fund (Forluz) - IPCA (Note 24) (94)    
Deficit of pension plan (Forluz) (Note 24) (543)    
Leasing liabilities (451)    
Liabilities (5,801)    
Net liabilities exposed (641)    
Net effect of fluctuation in IPCA and IGP-M indexes (27)    
IPCA [member] | Adverse Scenario [Member]      
Assets      
Concession financial assets related to Distribution infrastructure - IPCA [1] 2,010    
Concession financial assets related to gas distribution infrastructure - IGPM 41    
Concession Grant Fee - IPCA (Note 14) 3,238    
Assets 5,289    
Liabilities      
Loans and debentures - IPCA and IGP-DI (Note 22) (4,831)    
Debt agreed with pension fund (Forluz) - IPCA (Note 24) (96)    
Deficit of pension plan (Forluz) (Note 24) (557)    
Leasing liabilities (463)    
Liabilities (5,947)    
Net liabilities exposed (658)    
Net effect of fluctuation in IPCA and IGP-M indexes R$ (44)    
[1] Portion of the Concession financial assets relating to the Regulatory Remuneration Base of Assets ratified by the grantor (ANEEL) after the 4th tariff review cycle.