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20. INTANGIBLE ASSETS (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]        
Intangible assets R$ 11,624 R$ 10,777 R$ 11,156 R$ 10,820
Temporary Easement Intangible Assets [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 8 8    
Assets Of Concession [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 11,517 [1] 10,680 [1] 10,435 9,248
Temporary Easements Intangible Assets [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 8 8 10 10
Useful Life Defined Intangible Asset [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 11,542 10,714 11,156 9,285
Onerous Concession [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 7 7 8 9
Other Intangible Assets [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 10 19 R$ 17 R$ 18
Intangible Assets Under Development [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 82 63    
Gross Carrying Amount [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 20,230 18,852    
Gross Carrying Amount [Member] | Temporary Easement Intangible Assets [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 12 11    
Gross Carrying Amount [Member] | Assets Of Concession [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets [1] 20 18,674    
Gross Carrying Amount [Member] | Useful Life Defined Intangible Asset [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 20,148 18,789    
Gross Carrying Amount [Member] | Onerous Concession [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 20,039 19 [1]    
Gross Carrying Amount [Member] | Other Intangible Assets [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 82 85    
Gross Carrying Amount [Member] | Intangible Assets Under Development [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 82 63    
Accumulated Depreciation and Amortisation [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets (8,606) (8,075)    
Accumulated Depreciation and Amortisation [Member] | Temporary Easement Intangible Assets [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets (4) (3)    
Accumulated Depreciation and Amortisation [Member] | Assets Of Concession [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets [1] (8,522) (7,994)    
Accumulated Depreciation and Amortisation [Member] | Useful Life Defined Intangible Asset [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets (8,606) (8,075)    
Accumulated Depreciation and Amortisation [Member] | Onerous Concession [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets (8,522) (12)    
Accumulated Depreciation and Amortisation [Member] | Other Intangible Assets [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets R$ (67) R$ (66)    
[1] The rights of authorization to generate wind power granted to the subsidiary Parajuru and Volta do Rio, valued at R$ 127, and of the gas distribution concession, granted to Gasmig, valued at R$ 426, are classified in the consolidated statement of financial position under intangibles assets and are amortized by the straight-line method, for the period of the concessions.