XML 161 R140.htm IDEA: XBRL DOCUMENT v3.21.1
18. INTANGIBLE ASSETS (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]        
Intangible assets R$ 11,810 R$ 11,624 [1] R$ 10,777 R$ 11,156
Temporary Easements Intangible Assets [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 9 9 8  
Onerous Concession [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 6 7 7  
Assets Of Concession [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 11,674 [2] 11,517 [2] 10,680  
Other Intangible Assets [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 8 10 18  
Intangible Assets Under Development [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 113 82    
Useful Life Defined Intangible Asset [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 11,697 11,542 R$ 10,714  
Temporary Easement Intangible Assets [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets   8    
Historical cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 21,004 20,230    
Historical cost [member] | Onerous Concession [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 19 20    
Historical cost [member] | Assets Of Concession [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets [2] 20,781 20,039    
Historical cost [member] | Other Intangible Assets [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 78 77    
Historical cost [member] | Intangible Assets Under Development [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 20,891 82    
Historical cost [member] | Useful Life Defined Intangible Asset [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 113 20,148    
Historical cost [member] | Temporary Easement Intangible Assets [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets 13 12    
Accumulated depreciation and amortisation [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets   (8,606)    
Accumulated depreciation and amortisation [member] | Onerous Concession [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets (13) (13)    
Accumulated depreciation and amortisation [member] | Assets Of Concession [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets [2] (9,107) (8,522)    
Accumulated depreciation and amortisation [member] | Other Intangible Assets [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets (70) (67)    
Accumulated depreciation and amortisation [member] | Useful Life Defined Intangible Asset [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets (9,194) (8,606)    
Accumulated depreciation and amortisation [member] | Temporary Easement Intangible Assets [member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets R$ (4) R$ (4)    
[1] See note 2.8.
[2] The rights of authorization to generate wind power granted to the subsidiary Parajuru and Volta do Rio, at the net value of R$128, and of the gas distribution concession, granted to Gasmig, valued at R$412, 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.