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Loans, Financings and Debentures - Consolidated Totals of Funds Raised (Detail) - BRL (R$) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about borrowings [line items] |  |
Amount raised | R$ 4,812,000,000 |
Debt in Brazilian currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Transaction costs | (11,000,000) |
Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Amount raised | 5,737,000,000 | R$ 5,739,000,000
Debt in Foreign Currency [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Transaction costs | (16,000,000) |
Interest paid in advance | R$ (48,000,000) |
Caixa Economica Federal - Cemig D [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity | 2020 | 2018
Annual financial cost, % | 132.14% | 119.00%
Amount raised | R$ 674,000,000 | R$ 200,000,000
Debentures [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity | 2018 |
Annual financial cost, % | 4.05% |
Amount raised | R$ 1,575,000,000 |
KfW (Cemig GT) [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity | 2019 |
KfW (Cemig GT) [member] | Debt in Brazilian currency [member] | Fixed rate [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity | 2018 |
Annual financial cost, % | 1.78% |
Amount raised | R$ 2,000,000 |
Promissory Notes - Cemig GT - 7th Issue [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity | 2017 |
Annual financial cost, % | 128.00% |
Amount raised | R$ 606,000,000 |
Debentures - 4th Issue, 7th Series (Gasmig) [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity | 2020 |
Amount raised | R$ 24,000,000 |
Debentures: 7th Issue (CEMIG GT) [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity | 2021 |
Annual financial cost, % | 140.00% |
Amount raised | R$ 2,195,000,000 |
Banco do Brasil (Cemig GT) [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity | 2018 | 2015
Annual financial cost, % | 132.90% | 106.90%
Amount raised | R$ 580,000,000 | R$ 593,000,000
Sonda (Cemig Telecom) [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity | 2021 |
Annual financial cost, % | 110.00% |
Amount raised | R$ 81,000,000 |
Debentures sixth issue first series [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity |  | 2018
Annual financial cost, % |  | 1.60%
Amount raised |  | R$ 967,000,000
Debentures sixth issue second series [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity |  | 2020
Annual financial cost, % |  | 8.07%
Amount raised |  | R$ 27,000,000
Promissory Notes-6th Issue [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity |  | 2016
Annual financial cost, % |  | 120.00%
Amount raised |  | R$ 1,407,000,000
Banco da amazonia [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity |  | 2018
Annual financial cost, % |  | 1.90%
Amount raised |  | R$ 118,000,000
Promissory Notes-8th Issue [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity |  | 2016
Annual financial cost, % |  | 111.70%
Amount raised |  | R$ 1,685,000,000
Banco do brasil one [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity |  | 2020
Annual financial cost, % |  | 114.00%
Amount raised |  | R$ 487,000,000
Banco do brasil two [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity |  | 2017
Annual financial cost, % |  | 111.00%
Amount raised |  | R$ 98,000,000
Debentures, 4th Issue [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity | 2022 |
Annual financial cost, % | 0.74% |
Amount raised | R$ 34,000,000 |
Debentures, 4th Issue [member] | Debt in Brazilian currency [member] | Floating rates [member] | TJLP [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity |  | 2022
Annual financial cost, % |  | 75.00%
Amount raised |  | R$ 34,000,000
Debentures, 4th Issue [member] | Debt in Brazilian currency [member] | Floating rates [member] | Selic [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Annual financial cost, % |  | 25.00%
Debentures fifth issue [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity | 2022 | 2018
Annual financial cost, % | 146.50% | 1.60%
Amount raised | R$ 1,575,000,000 | R$ 100,000,000
Itau unibanco banco b b m [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity |  | 2016
Annual financial cost, % |  | 120.00%
Amount raised |  | R$ 23,000,000
Eurobonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity | 2024 |
Eurobonds [member] | Debt in Foreign Currency [member] | Fixed rate [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity | 2024 |
Annual financial cost, % | 9.25% |
Amount raised | R$ 3,252,000,000 |
Debentures, 2nd Issue [member] | Debt in Brazilian currency [member] | Floating rates [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal maturity | 2019 |
Annual financial cost, % | 128.50% |
Amount raised | R$ 26,000,000 |

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