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18. INVESTMENTS (Details 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about investment property [line items]      
Beginning balance R$ 745 R$ 1,108 R$ 1,325
Additions   110  
Amortization (41) (74) (84)
Written off   (399) (133)
Ending balance 704 745 1,108
TAESA [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 180 189 288
Additions    
Amortization (9) (9) (13)
Written off   (86)
Ending balance 171 180 189
Retiro Baixo [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 32 28 29
Additions   6  
Amortization (1) (2) (1)
Written off  
Ending balance 31 32 28
Central Eolica Praias De Parajuru [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [1] 17 19
Additions [1]    
Amortization [1] [2] (2) (1)
Written off [1]   (15) (1)
Ending balance [1] [2] 17
Central Eolica Volta do Rio [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [3] 11 14
Additions [3]    
Amortization [3] (1) (1)
Written off [3]   (10) (2)
Ending balance [3] 11
Central Eolica Praias De Morgado [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [3] 24 27
Additions [3]    
Amortization [3] (2) (2)
Written off [3]   (22) (1)
Ending balance [3] 24
Madeira Energia (Santo Antonio plant) [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 18 151 157
Additions    
Amortization (1) (6) (6)
Written off   (127)
Ending balance 17 18 151
Lightger [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 84
Additions   84  
Amortization (3)
Written off  
Ending balance 81 84
Light [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 186 209
Additions    
Amortization (20) (23)
Written off   (166)
Ending balance 186
Alianca Geracao [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 378 403 428
Additions    
Amortization (25) (25) (25)
Written off  
Ending balance 353 378 403
Alianca Norte (Belo Monte plant) [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 53 55 57
Additions    
Amortization (2) (2) (2)
Written off  
Ending balance 51 53 55
Lepsa [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 49
Additions    
Amortization (6)
Written off   (43)
Ending balance
RME [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 44 48
Additions   20  
Amortization (5) (4)
Written off   (59)
Ending balance R$ 44
[1] As from 2018 the investees Central Eolica Praias de Parajuru and Central Eolica Volta do Rio are being consolidated
[2] With the cessation of control of Light, the remaining equity interest in these investees was recognized as an investment in affiliates or jointly- controlled subsidiaries, and measured by the equity method, in accordance with IFRS 10. For more details please see Notes 1 and 34.
[3] Changes arising from the elimination of crossover holding of the assets between Cemig GT and Energimp that occurred in 2018. As from 2018 the investees Central Eolica Praias de Parajuru and Central Eolica Volta do Rio are being consolidated by Cemig GT.