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32. ASSETS AS HELD FOR SALE AND DISCONTINUED OPERATIONS (Details Narrative) - BRL (R$)
R$ / shares in Units, R$ in Millions
 12 Months Ended
Jan. 30, 2021
Jan. 22, 2021
Jan. 07, 2021
Jul. 17, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 31, 2020
Disclosure of assets and liabilities classified as held for sale [line items]                
Number of shares sold (in shares)         1,518,752,601 1,458,752,601 1,458,752,601 60,000,000
Share price               R$ 5.00
Gain on disposal of assets         R$ 1,753 R$ 998 R$ 893  
Estimated costs for the sale         R$ 29      
Dividends declared           R$ 364    
Light [member] | Events after reporting period [member]                
Disclosure of assets and liabilities classified as held for sale [line items]                
Description of sale of common shares     The Company Board of Directors approved the sale of its 68,621,264 common shares in Light, comprising the Company’s entire holding, in a public offering for distribution of a total of 137,242,528 common shares in Light. This offering comprises: (a) primary distribution of 68,621,264 new common shares in Light (“the Primary Offering”); and (b) a secondary distribution, of the Company shares, with restricted placement efforts. The Board of Directors also approved the non-exercise of the Company’s right of first refusal in the Primary Offering, and, consequently waiver, by the Company, of that right of priority in subscription of shares in the Primary Offering.          
Total   R$ 1,372            
Share price   R$ 20            
Gain after taxes R$ 109              
Adjustment in the tax calculation resulted in a positive effect R$ 113              
Bottom Of Range [member]                
Disclosure of assets and liabilities classified as held for sale [line items]                
Number of shares sold (in shares)         68,621,263      
Voting rights percentage         22.58%      
Top of Range [member]                
Disclosure of assets and liabilities classified as held for sale [line items]                
Number of shares sold (in shares)         303,934,060      
Voting rights percentage         49.99%      
Initial public offering [member]                
Disclosure of assets and liabilities classified as held for sale [line items]                
Number of shares sold (in shares)       33,333,333        
Proceeds from issuance of shares       R$ 625        
Share price       R$ 18.75