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18. INTANGIBLE ASSETS (Details Narrative) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]        
Capitalized borrowing costs R$ 1 R$ 2 R$ 4  
Annual average amortization rate 4.05%      
Assets R$ 4,058      
impairment reversal 14 22    
Intangible assets 11,810 11,624 [1] R$ 10,777 R$ 11,156
Gasmig [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 412 427    
Parajuru and Volta do Rio [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 128 127    
concession contract assets to intangible assets [member]        
Disclosure of detailed information about intangible assets [line items]        
Assets 906 685    
plant and equipment to intangible assets [member]        
Disclosure of detailed information about intangible assets [line items]        
Assets 2 4    
concession financial asset to intangible assets [member]        
Disclosure of detailed information about intangible assets [line items]        
Assets R$ 5 R$ 23    
[1] See note 2.8.