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16. INVESTMENTS (Details 11)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
BRL (R$)
MWh
Disclosure of detailed information about investment property [line items]  
Generation Capacity (MW) | MWh 32
Generation Capacity (MWp) | MWh 41.06
Net fair value of the identifiable assets and liabilities - Cemig Sim shareholding (49%) R$ 80
Transaction price 73
Bargain purchase /Loss R$ 7
Corinto [member]  
Disclosure of detailed information about investment property [line items]  
Generation Capacity (MW) | MWh 5
Generation Capacity (MWp) | MWh 5.28
Acquisition date Aug. 19, 2020
Net fair value of the identifiable assets and liabilities - Cemig Sim shareholding (49%) R$ 9
Transaction price 9
Bargain purchase /Loss
Manga [member]  
Disclosure of detailed information about investment property [line items]  
Generation Capacity (MW) | MWh 5
Generation Capacity (MWp) | MWh 6.34
Acquisition date Sep. 30, 2020
Net fair value of the identifiable assets and liabilities - Cemig Sim shareholding (49%) R$ 11
Transaction price 10
Bargain purchase /Loss R$ 1
Bonfinopolis [member]  
Disclosure of detailed information about investment property [line items]  
Generation Capacity (MW) | MWh 2.5
Generation Capacity (MWp) | MWh 3.45
Acquisition date Nov. 25, 2020
Net fair value of the identifiable assets and liabilities - Cemig Sim shareholding (49%) R$ 6
Transaction price 6
Bargain purchase /Loss
Lagoa Grande [member]  
Disclosure of detailed information about investment property [line items]  
Generation Capacity (MW) | MWh 5
Generation Capacity (MWp) | MWh 7.33
Acquisition date Nov. 25, 2020
Net fair value of the identifiable assets and liabilities - Cemig Sim shareholding (49%) R$ 15
Transaction price 12
Bargain purchase /Loss R$ 3
Lontra [member]  
Disclosure of detailed information about investment property [line items]  
Generation Capacity (MW) | MWh 5
Generation Capacity (MWp) | MWh 6.38
Acquisition date Nov. 25, 2020
Net fair value of the identifiable assets and liabilities - Cemig Sim shareholding (49%) R$ 17
Transaction price 14
Bargain purchase /Loss R$ 3
Mato Verde [member]  
Disclosure of detailed information about investment property [line items]  
Generation Capacity (MW) | MWh 2.5
Generation Capacity (MWp) | MWh 3.23
Acquisition date Nov. 25, 2020
Net fair value of the identifiable assets and liabilities - Cemig Sim shareholding (49%) R$ 6
Transaction price 5
Bargain purchase /Loss R$ 1
Mirabela [member]  
Disclosure of detailed information about investment property [line items]  
Generation Capacity (MW) | MWh 2
Generation Capacity (MWp) | MWh 2.59
Acquisition date Nov. 25, 2020
Net fair value of the identifiable assets and liabilities - Cemig Sim shareholding (49%) R$ 4
Transaction price 5
Bargain purchase /Loss R$ (1)
Porteirinha [member]  
Disclosure of detailed information about investment property [line items]  
Generation Capacity (MW) | MWh 2.5
Generation Capacity (MWp) | MWh 3.23
Acquisition date Nov. 25, 2020
Net fair value of the identifiable assets and liabilities - Cemig Sim shareholding (49%) R$ 6
Transaction price 6
Bargain purchase /Loss
Porteirinha II [member]  
Disclosure of detailed information about investment property [line items]  
Generation Capacity (MW) | MWh 2.5
Generation Capacity (MWp) | MWh 3.23
Acquisition date Nov. 25, 2020
Net fair value of the identifiable assets and liabilities - Cemig Sim shareholding (49%) R$ 6
Transaction price 6
Bargain purchase /Loss