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27. PROVISIONS (Details Narrative) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2006
Disclosure of other provisions [line items]      
Equity Interest 1100.00%    
Penalty payment R$ 27    
Labor Claims [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount 1,679 R$ 1,725  
Estimated probably contingent amount 487 457  
Alteration Of The Monetary Updating Index Of Employment-Law Cases [Member]      
Disclosure of other provisions [line items]      
Estimate contigent liability amount 106 88  
Provisional contingent amount 10    
Customers Claims [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount 68 66  
Estimated probably contingent amount 19 19  
Other Civil Proceedings [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount 300 277  
Estimated probably contingent amount 18 29  
Tax Related To Urban Property Tax [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount 204 160  
Estimated probably contingent amount 43 46  
Tax Related To Urban Land Tax To Real Estate Properties [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount 79 142  
Estimated probably contingent amount 4 5  
Social Security Contributions On Profit Sharing Payments [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount 1,451 1,264  
Estimated probably contingent amount 1,213    
Environmental [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount 47 15  
Regulatory [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount 280 260  
Estimated probably contingent amount 36 37  
Other legal Actions [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount 41 36  
Luz Para Todos' Program [Member]      
Disclosure of other provisions [line items]      
Estimated probably contingent amount 4    
Estimate contigent liability amount 322 291  
Other Legal Proceedings [Member]      
Disclosure of other provisions [line items]      
Estimated probably contingent amount 13 11  
Estimate contigent liability amount 452 189  
Employees [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount 289 304  
Indemnity to employees amount     R$ 178
Indemnity to employees escrow deposit 282 275 R$ 122
Social Security Contributions [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount 112 155  
Non-Homologation Of Offsetting Of Tax Credit [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount 160 146  
Income Tax Withheld On Capital Gain [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount R$ 230 221  
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 SA [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$ 400 350  
ICMS (Local State Value Added Tax) [Member]      
Disclosure of other provisions [line items]      
ICMS (local state value added tax) amount 55    
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$ 89    
ICMS (Local State Value Added Tax) [Member] | Bottom Of Range [Member]      
Disclosure of other provisions [line items]      
Periodic term 25 years    
Public Lighting Contribution (CIP) [Member]      
Disclosure of other provisions [line items]      
Estimate contigent liability amount R$ 959 975  
Periodic term 20 years    
Accounting Of Energy Sale Transactions In The Electricity Trading Chamber (CCEE) [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount R$ 343 317  
Tariff Increases [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount 327 303  
Environmental Claims [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount 165 148  
Estimate contigent liability amount R$ 95 87  
Percentage of annual gross operating revenue 0.50%    
Other Contingent Liabilities [Member]      
Disclosure of other provisions [line items]      
Contigent liability amount R$ 426 412  
Estimate contigent liability amount R$ 149 R$ 90