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Insurance - Summary of Amounts Arising From Insurance Contracts (Detail) - 12 months ended Dec. 31, 2017 R$ in Thousands, $ in Thousands | BRL (R$) | USD ($) | USD ($)
--- | --- | --- | ---
Companhia Energetica de Minas Gerais Holding [Member] | Facilities in buildings [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Fire | Fire |
Amount insured | R$ 53,348 |  |
Annual premium | R$ 12 |  |
Companhia Energetica de Minas Gerais Holding [Member] | Bottom of range [member] | Facilities in buildings [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Jan 8, 2018 | Jan 8, 2018 |
Companhia Energetica de Minas Gerais Holding [Member] | Top of range [member] | Facilities in buildings [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Jan 8, 2019 | Jan 8, 2019 |
Cemig Geracao e Transmissao [member] | Air transport Aircraft Fuselage [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Fuselage | Fuselage |
Amount insured | $ |  |  | $ 4,675
Cemig Geracao e Transmissao [member] | Air transport [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Third party | Third party |
Amount insured | $ |  |  | 14,000
Annual premium | $ |  | $ 58 |
Cemig Geracao e Transmissao [member] | Ware house stores [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Fire | Fire |
Amount insured | R$ 14,931 |  |
Annual premium | R$ 21 |  |
Cemig Geracao e Transmissao [member] | Buildings [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Fire | Fire |
Amount insured | R$ 454,828 |  |
Annual premium | R$ 98 |  |
Cemig Geracao e Transmissao [member] | Telecoms equipment [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Fire | Fire |
Amount insured | R$ 11,514 |  |
Annual premium | R$ 5 |  |
Cemig Geracao e Transmissao [member] | Operational risk [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | - | - |
Amount insured | R$ 1,333,711 |  |
Annual premium | R$ 1,790 |  |
Cemig Geracao e Transmissao [member] | Bottom of range [member] | Air transport [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Apr 29, 2017 | Apr 29, 2017 |
Cemig Geracao e Transmissao [member] | Bottom of range [member] | Ware house stores [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Oct 02, 2017 | Oct 02, 2017 |
Cemig Geracao e Transmissao [member] | Bottom of range [member] | Buildings [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Jan 08, 2018 | Jan 08, 2018 |
Cemig Geracao e Transmissao [member] | Bottom of range [member] | Telecoms equipment [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Jan 08, 2018 | Jan 08, 2018 |
Cemig Geracao e Transmissao [member] | Bottom of range [member] | Operational risk [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Dec 07, 2017 | Dec 07, 2017 |
Cemig Geracao e Transmissao [member] | Top of range [member] | Air transport [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Apr 29, 2018 | Apr 29, 2018 |
Cemig Geracao e Transmissao [member] | Top of range [member] | Ware house stores [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Oct 02, 2018 | Oct 02, 2018 |
Cemig Geracao e Transmissao [member] | Top of range [member] | Buildings [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Jan 08, 2019 | Jan 08, 2019 |
Cemig Geracao e Transmissao [member] | Top of range [member] | Telecoms equipment [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Jan 08, 2019 | Jan 08, 2019 |
Cemig Geracao e Transmissao [member] | Top of range [member] | Operational risk [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Dec 07, 2018 | Dec 07, 2018 |
Cemig Distribution [member] | Facilities in buildings [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Fire | Fire |
Amount insured | R$ 1,003,221 |  |
Annual premium | R$ 217 |  |
Cemig Distribution [member] | Air transport Aircraft Fuselage [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Fuselage | Fuselage |
Amount insured | $ |  |  | 3,613
Cemig Distribution [member] | Air transport [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Third party | Third party |
Amount insured | $ |  |  | $ 14,000
Annual premium | R$ 42 | $ 42 |
Cemig Distribution [member] | Ware house stores [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Fire | Fire |
Amount insured | R$ 84,169 |  |
Annual premium | R$ 120 |  |
Cemig Distribution [member] | Telecoms equipment [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Fire | Fire |
Amount insured | R$ 17,208 |  |
Annual premium | R$ 7 |  |
Cemig Distribution [member] | Operational risk [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Total | Total |
Amount insured | R$ 471,265 |  |
Annual premium | R$ 633 |  |
Cemig Distribution [member] | Bottom of range [member] | Facilities in buildings [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Jan 08, 2018 | Jan 08, 2018 |
Cemig Distribution [member] | Bottom of range [member] | Air transport [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Apr 29, 2017 | Apr 29, 2017 |
Cemig Distribution [member] | Bottom of range [member] | Ware house stores [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Oct 02, 2017 | Oct 02, 2017 |
Cemig Distribution [member] | Bottom of range [member] | Telecoms equipment [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Jan 08, 2018 | Jan 08, 2018 |
Cemig Distribution [member] | Bottom of range [member] | Operational risk [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Dec 07, 2017 | Dec 07, 2017 |
Cemig Distribution [member] | Top of range [member] | Facilities in buildings [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Jan 08, 2019 | Jan 08, 2019 |
Cemig Distribution [member] | Top of range [member] | Air transport [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Apr 29, 2018 | Apr 29, 2018 |
Cemig Distribution [member] | Top of range [member] | Ware house stores [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Oct 02, 2018 | Oct 02, 2018 |
Cemig Distribution [member] | Top of range [member] | Telecoms equipment [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Jan 08, 2019 | Jan 08, 2019 |
Cemig Distribution [member] | Top of range [member] | Operational risk [member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Dec 07, 2018 | Dec 07, 2018 |
Gasmig [member] | Gas Distribution Network Third Party [Member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Third party | Third party |
Amount insured | R$ 60,000 |  |
Annual premium | R$ 429 |  |
Gasmig [member] | Own Vehicle Fleet Operation [Member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Damage to third parties only | Damage to third parties only |
Amount insured | R$ 500 |  |
Annual premium | R$ 2 |  |
Gasmig [member] | Own Vehicle Fleet Directors [Member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Full cover | Full cover |
Amount insured | R$ 100 |  |
Annual premium | R$ 1 |  |
Gasmig [member] | Facilities Multirisk [Member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Cover | Robbery, theft and fire | Robbery, theft and fire |
Amount insured | R$ 41,374 |  |
Gasmig [member] | Bottom of range [member] | Gas Distribution Network Third Party [Member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Dec 15, 2017 | Dec 15, 2017 |
Gasmig [member] | Bottom of range [member] | Own Vehicle Fleet Operation [Member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Jul 07, 2017 | Jul 07, 2017 |
Gasmig [member] | Bottom of range [member] | Own Vehicle Fleet Directors [Member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Oct 25, 2017 | Oct 25, 2017 |
Gasmig [member] | Bottom of range [member] | Facilities Multirisk [Member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Jan 01, 2017 | Jan 01, 2017 |
Gasmig [member] | Top of range [member] | Gas Distribution Network Third Party [Member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Dec 15, 2018 | Dec 15, 2018 |
Gasmig [member] | Top of range [member] | Own Vehicle Fleet Operation [Member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Jul 07, 2018 | Jul 07, 2018 |
Gasmig [member] | Top of range [member] | Own Vehicle Fleet Directors [Member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Oct 25, 2018 | Oct 25, 2018 |
Gasmig [member] | Top of range [member] | Facilities Multirisk [Member] |  |  |
Disclosure of types of insurance contracts [line items] |  |  |
Dates of cover | Jan 01, 2018 | Jan 01, 2018 |

X
- Definition The amount of assets under insurance contracts and reinsurance contracts issued. [Refer: Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 4 -IssueDate 2017-01-01 -Paragraph IG20 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=4&date=2017-03-01&anchor=para_IG20_b&doctype=Implementation%20Guidance -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 4 -IssueDate 2017-01-01 -Paragraph 37 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=4&date=2017-03-01&anchor=para_37_b&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of premiums written, net of amounts reinsured with third parties. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Type of insurance coverage. + References No definition available. + Details
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