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22. LOANS, FINANCING AND DEBENTURES (Detail 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]      
Transaction costs R$ 57    
Discount on the issuance of debentures (18)    
Interest paid in advance R$ (25)    
Debentures [member]      
Disclosure of detailed information about borrowings [line items]      
Signature date [1]     Aug. 31, 2018
Principal maturity [1]     2023
Annual financial cost, % [1]     CDI + 1.50% 
Amount [1]     R$ 100
Debentures Sixth Issue Single Series [member]      
Disclosure of detailed information about borrowings [line items]      
Signature date [2]     Dec. 31, 2018
Principal maturity [2]     2020
Annual financial cost, % [2]     CDI + 1.75% 
Amount [2]     R$ 550
Transaction costs     (4)
Brazilian Currency [member]      
Disclosure of detailed information about borrowings [line items]      
Transaction costs   R$ (10) (4)
Discount on the issuance of debentures [3]   (23)  
Total raised   R$ 4,477 R$ 2,990
Brazilian Currency [member] | Debentures - 7th Issue - 1st Series [member]      
Disclosure of detailed information about borrowings [line items]      
Signature date [4]   Jul. 31, 2019  
Principal maturity [4]   2024  
Annual financial cost, % [4]   CDI + 0.454%   
Amount [4]   R$ 2,160  
Brazilian Currency [member] | Debentures - 7th Issue - 2nd Series [member]      
Disclosure of detailed information about borrowings [line items]      
Signature date [4]   Jul. 31, 2019  
Principal maturity [4]   2026  
Annual financial cost, % [4]   4.10% of IPCA   
Amount [4]   R$ 1,500  
Brazilian Currency [member] | Promissory Notes - 1st Issue [member]      
Disclosure of detailed information about borrowings [line items]      
Signature date [5]   Sep. 30, 2019  
Principal maturity [5]   2020  
Annual financial cost, % [5]   107.00% of CDI   
Amount [5]   R$ 850  
Brazilian Currency [member] | Promissory Notes - 9th Issue - Single Series [member]      
Disclosure of detailed information about borrowings [line items]      
Signature date [6]     May 31, 2018
Principal maturity [6]     2019
Annual financial cost, % [6]     151% of CDI 
Amount [6]     R$ 400
Brazilian Currency [member] | Debentures - 8th Issue - Single Series [member]      
Disclosure of detailed information about borrowings [line items]      
Signature date Sep. 30, 2020    
Principal maturity 2031    
Annual financial cost, % IPCA + 5.27%    
Amount R$ 850    
Transaction costs 24    
Total raised R$ 826    
Foreign Currency [member]      
Disclosure of detailed information about borrowings [line items]      
Transaction costs     (8)
Interest paid in advance [7]     10
Total raised     R$ 1,948
Foreign Currency [member] | Eurobonds [member]      
Disclosure of detailed information about borrowings [line items]      
Signature date [8]     Jul. 31, 2018
Principal maturity [8]     2024
Annual financial cost, % [8]     9.25%
Amount [8]     R$ 1,946
[1] In August 2018 Gasmig completed its 7th debenture issue, with maturity at 5 years, paying CDI 1.50%, with annual amortization from August 2019.
[2] In December 2018 the 6th Debenture Issue was placed, with maturity at 18 months, annual remuneration of CDI +1.75%, and monthly amortization in 12 payments from July 3, 2019.
[3] Discount on the sale price of the 2nd series of the debentures issued by Cemig Distribuicao.
[4] Cemig Distribuicao.
[5] Gasmig.
[6] In May 2018 Cemig D made its 9th Promissory Note issue, with maturity at 18 months, annual remuneration of 151% of the CDI rate, and single bullet amortization on October 24, 2019.
[7] Advance of funds to achieve the yield to maturity agreed in the Eurobonds contract.
[8] In July 2018, Cemig GT completed financial settlement of an additional tranche to its initial Eurobond issue completed on December 5, 2017. The new tranche, of US$ 500, which brought the total of the issuance to R$ 1,946 billion, has half-yearly coupon of 9.25% p.a., with maturity of the principal in 2024.