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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.

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