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17. PROPERTY, PLANT AND EQUIPMENT (Details 4) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Total R$ 101 R$ 108
Usina de Queimado [meber]    
Disclosure of detailed information about property, plant and equipment [line items]    
Total R$ 218 217
Usina de Queimado [meber] | Investment property completed [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Stake in power output (%) 82.50%  
Average annual depreciation rate (%) 3.93%  
Usina de Queimado [meber] | Investment property completed [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Stake in power output (%) 82.50%  
Average annual depreciation rate (%)  
Accumulated depreciation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Total R$ (117) (109)
Usina de Queimado [meber]    
Disclosure of detailed information about property, plant and equipment [line items]    
Total R$ 2 R$ 1