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16. INVESTMENTS (Details 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about investment property [line items]      
Beginning balance R$ 704 R$ 745 R$ 1,108
Additions     110
Amortization (40) (41) (74)
Written off     (399)
Ending balance 664 704 745
Retiro baixo [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 31 32 28
Additions     6
Amortization (1) (1) (2)
Written off    
Ending balance 30 31 32
Central eolica praias de parajuru [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [1] 17
Additions [1]    
Amortization [1] (2)
Written off [1]     (15)
Ending balance [1]
Central eolica volta do rio [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [1] 11
Additions [1]    
Amortization [1] (1)
Written off [2]   (10) [1]
Ending balance [1]
Central eolica praias de morgado [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [1] 24
Additions [1]    
Amortization [1] (2)
Written off [1]     (22)
Ending balance [1]
TAESA [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 171 180 189
Additions    
Amortization (8) (9) (9)
Written off    
Ending balance 163 171 180
Madeira energia (santo antonio plant) [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 17 18 151
Additions    
Amortization (1) (1) (6)
Written off   (127)
Ending balance 16 17 18
Lightger [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 81 84
Additions     84
Amortization (3) (3)
Written off    
Ending balance 78 81 84
Light [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 186
Additions    
Amortization (20)
Written off     (166)
Ending balance
Alianca geracao [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 353 378 403
Additions    
Amortization (25) (25) (25)
Written off  
Ending balance 328 353 378
Alianca norte (belo monte plant) [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 51 53 55
Additions    
Amortization (2) (2) (2)
Written off  
Ending balance 49 51 53
RME [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 44
Additions     20
Amortization (5)
Written off     (59)
Ending balance
[1] As from 2018 the investees Central Eolica Praias de Parajuru and Central Eolica Volta do Rio are being consolidated
[2] As from 2018 the investees Central Eolica Praias de Parajuru and Central Eolica Volta do Rio are being consolidated.