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Investments - Additional Information (Detail) - BRL (R$) R$ / shares in Units, shares in Millions, R$ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 23, 2018 | Aug. 27, 2017 | May 15, 2017 | Nov. 30, 2017 | Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | May 03, 2018 | Mar. 27, 2018 | Jun. 30, 2017
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Net working capital balance |  |  |  |  |  | R$ (126) |  |  |  |  |  |
Investments in jointly controlled entities and affiliated companies |  |  |  |  |  | 7,792 | R$ 8,753 | R$ 9,745 |  |  |  |
Investment |  |  |  |  |  | 618 | 801 | 861 | R$ 906 |  |  |
Sold equity interest |  |  |  | R$ 717 |  |  |  |  |  |  |  |
Unit sold |  |  |  | 34 |  |  |  |  |  |  |  |
Price per share unit |  |  |  | R$ 21.10 |  |  |  |  |  |  |  |
Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of share capital |  |  |  | 31.54% |  |  |  |  |  |  |  |
Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of share capital |  |  |  | 21.68% |  |  |  |  |  |  |  |
Taesa [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  | 189 | 288 | 415 | 433 |  |  |
Restructuring- Investments in joint ventures and associatess, subsidiaries and other Business units |  |  |  |  | R$ 56 |  |  |  |  |  |  |
Light [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Net working capital balance |  |  |  |  |  | 1,355 | 1,259 |  |  |  |  |
Madeira Energia [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Net working capital balance |  |  |  |  |  | 1,474 | 1,611 |  |  |  |  |
Renova Energia SA [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Net working capital balance |  |  |  |  |  | 1,607 | 3,211 |  |  |  |  |
Loss on investments |  |  |  |  |  | 2,195 | R$ 1,101 | R$ 93 |  |  |  |
SP Participacoes SA [Member] | Major business combination [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity acquired |  |  |  |  |  |  |  |  |  |  | 100.00% |
BrasilPCHSA [member] | Major business combination [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity acquired |  |  |  |  |  |  |  |  |  |  | 51.00% |
Belo Monte Plant Through Amaznia Energia S A A And Alianca Norte[member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest in entities wholly owned directly or indirectly |  |  |  |  |  |  | 11.74% |  |  |  |  |
Loss contingencies |  |  |  |  |  | 286 | R$ 74 |  |  |  |  |
Santo Antonio Hydroelectric Plant Through Madeira Energia SA (Mesa) and FIP Melbourne [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Investments in jointly controlled entities and affiliated companies |  |  |  |  |  | 1,117 | 1,321 |  |  |  |  |
Expenditures on property plant and equipment |  |  |  |  |  | 21,611 |  |  |  |  |  |
SAAG Investimentos S.A. and Ceming GT [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for claims |  |  |  |  |  |  |  |  | 750 |  |  |
Adjustments for impairment |  |  |  |  |  |  |  |  | R$ 750 |  |  |
Cemig GT [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
InvestmentWriteDowns |  |  |  |  |  | 183 | 679 |  |  |  |  |
Reclassified positive adjustments in other comprehensive income |  |  | R$ 60 |  |  |  |  |  |  |  |  |
Impairments loss |  |  |  |  |  | 285 | 90 |  |  |  |  |
Percentage of equity acquired |  |  |  | 50.00% |  |  |  |  |  |  |  |
Equity interests of acquirer |  |  |  | R$ 185 |  |  |  |  |  |  |  |
Cemig GT [member] | Lepsa [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Equity interests of acquirer |  |  |  | R$ 147 |  |  |  |  |  |  |  |
Cemig GT [member] | Lepsa [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity acquired |  |  |  | 66.62% |  |  |  |  |  |  |  |
Cemig GT [member] | Lepsa [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity acquired |  |  |  | 100.00% |  |  |  |  |  |  |  |
Cemig GT [member] | RME [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Equity interests of acquirer |  |  |  | R$ 38 |  |  |  |  |  |  |  |
Cemig GT [member] | RME [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity acquired |  |  |  | 66.27% |  |  |  |  |  |  |  |
Cemig GT [member] | RME [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity acquired |  |  |  | 75.00% |  |  |  |  |  |  |  |
Renova Energia SA [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Change in quoted price of the shares fair value |  |  |  |  |  | 73 |  |  |  |  |  |
Terra Form Global Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  | 306 |  |  |  |  |  |  |  |  |
Reclassified positive adjustments in other comprehensive income |  |  | R$ 172 |  |  |  |  |  |  |  |  |
Arbitration proceedings |  |  |  |  |  |  |  |  |  |  |  | R$ 49
Renova [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Impairments loss |  |  |  |  |  | R$ 787 | R$ 264 |  |  |  |  |
Proceeds from sales of plant |  | R$ 15 |  |  |  |  |  |  |  |  |  |
Percentage of equity acquired |  |  |  |  |  |  |  |  |  | 51.00% |  |
Renova [member] | Major business combination [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of assets | R$ 650 |  |  |  |  |  |  |  |  |  |  |
Earn out payments | 150 |  |  |  |  |  |  |  |  |  |  |
Projects development | R$ 187 |  |  |  |  |  |  |  |  |  |  |

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