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25. PROVISIONS (Details Narrative) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2006
Labor Claims [member]      
Disclosure of other provisions [line items]      
Contigent liability amount R$ 1,386 R$ 1,679  
Estimated probably contingent amount 427 497  
Customers Claims [member]      
Disclosure of other provisions [line items]      
Contigent liability amount 142 68  
Estimated probably contingent amount 23 19  
Other Civil Proceedings [member]      
Disclosure of other provisions [line items]      
Contigent liability amount 359 300  
Estimated probably contingent amount 32 18  
Tax Related To Urban Property Tax [member]      
Disclosure of other provisions [line items]      
Contigent liability amount 166 204  
Estimated probably contingent amount 14 43  
Tax Related To Urban Land Tax To Real Estate Properties [member]      
Disclosure of other provisions [line items]      
Contigent liability amount 85 79  
Estimated probably contingent amount 4 4  
Social Security Contributions On Profit Sharing Payments [member]      
Disclosure of other provisions [line items]      
Contigent liability amount 1,520 1,451  
Estimated probably contingent amount 1,276 1,213  
Regulatory [member]      
Disclosure of other provisions [line items]      
Contigent liability amount 345 280  
Estimated probably contingent amount 52 36  
Other legal Actions [member]      
Disclosure of other provisions [line items]      
Contigent liability amount 46 41  
Luz Para Todos' Program [member]      
Disclosure of other provisions [line items]      
Estimated probably contingent amount   1  
Estimate contigent liability amount 356 322  
Other Legal Proceedings [member]      
Disclosure of other provisions [line items]      
Estimated probably contingent amount 17 13  
Estimate contigent liability amount 621 452  
Employees [member]      
Disclosure of other provisions [line items]      
Contigent liability amount 295 289  
Indemnity to employees amount     R$ 178
Indemnity to employees escrow deposit 286 282 R$ 122
Social Security Contributions [member]      
Disclosure of other provisions [line items]      
Contigent liability amount 110 112  
Non-Homologation Of Offsetting Of Tax Credit [member]      
Disclosure of other provisions [line items]      
Contigent liability amount 203 160  
Income Tax Withheld On Capital Gain [member]      
Disclosure of other provisions [line items]      
Contigent liability amount R$ 234 230  
Income Tax Withheld On Capital Gain [member] | Parati S.A [member]      
Disclosure of other provisions [line items]      
Equity Interest 100.00%    
Income Tax Withheld On Capital Gain [member] | Luce Brasil Equity Investment Fund [member]      
Disclosure of other provisions [line items]      
Equity Interest 75.00%    
Income Tax Withheld On Capital Gain [member] | Light s.a. ('light') [member]      
Disclosure of other provisions [line items]      
Equity Interest 13.03%    
The Social Contribution Tax On Net Income (CSLL) [member]      
Disclosure of other provisions [line items]      
Contigent liability amount R$ 425 400  
Public Lighting Contribution (CIP) [member]      
Disclosure of other provisions [line items]      
Estimate contigent liability amount 1,072 959  
Accounting Of Energy Sale Transactions In The Electricity Trading Chamber (CCEE) [member]      
Disclosure of other provisions [line items]      
Contigent liability amount 376 343  
Tariff Increases [member]      
Disclosure of other provisions [line items]      
Contigent liability amount 357 327  
Environmental Claims [member]      
Disclosure of other provisions [line items]      
Contigent liability amount 186 165  
Estimate contigent liability amount 106 95  
Other Contingent Liabilities [member]      
Disclosure of other provisions [line items]      
Contigent liability amount 448 426  
Estimate contigent liability amount 167 R$ 149  
ICMS (Local State Value Added Tax) [member]      
Disclosure of other provisions [line items]      
ICMS (local state value added tax) principal amount 17    
ICMS (local state value added tax) penalty 27    
ICMS (local state value added tax) interest amount 11    
Contingency expiry by limitation of time R$ 107