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35. INSURANCE (Details)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Companhia Energetica De Minas Gerais [Member] | Facilities In Buildings [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Fire
Coverage period Jan. 8, 2020 to Jan. 8, 2021
Amount insured R$ 8,661 [1]
Annual premium R$ 2 [1]
Cemig Geracao E Transmissao [Member] | Air Transport Aircraft [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Fuselage
Coverage period April 29, 2019 to 29-Apr-20
Amount insured R$ 4,385 [1]
Annual premium R$ 49 [1]
Cemig Geracao E Transmissao [Member] | Air Transport Aircraft [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Third party
Coverage period April 29, 2019 to 29-Apr-20
Amount insured R$ 14,000 [1]
Cemig Geracao E Transmissao [Member] | Warehouse Stores [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Fire
Coverage period Nov. 2, 2019 to Nov. 2, 2020
Amount insured R$ 20,771 [1]
Annual premium R$ 20 [1]
Cemig Geracao E Transmissao [Member] | Buildings [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Fire
Coverage period Jan. 8, 2020 to Jan. 8, 2021
Amount insured R$ 275,773 [1]
Annual premium R$ 75 [1]
Cemig Geracao E Transmissao [Member] | Telecoms Equipment [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Fire [2]
Coverage period Jan. 8, 2019 to Jan. 8, 2020 [2]
Amount insured R$ 2,650 [1],[2]
Annual premium R$ 2 [1],[2]
Cemig Geracao E Transmissao [Member] | Operational Risk [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Total [3]
Coverage period Dec. 7, 2019 to Dec. 7, 2020 [3]
Amount insured R$ 959,243 [1],[3]
Annual premium R$ 1,262 [1],[3]
GASMIG [Member] | Gas Distribution Network Third Party [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Third party
Coverage period Dec. 15, 2019 to Dec. 15, 2020
Amount insured R$ 60,000 [1]
Annual premium R$ 398 [1]
GASMIG [Member] | Own Vehicle Fleet (Operation) [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Damage to third parties only
Coverage period Jul. 7, 2019 to Jul. 7, 2020
Amount insured R$ 500 [1]
Annual premium R$ 3 [1]
GASMIG [Member] | Own Vehicle Fleet Directors [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Full cover
Coverage period Oct. 25, 2019 to Oct. 25, 2020
Amount insured R$ 100 [1]
Annual premium R$ 2 [1]
GASMIG [Member] | Facilities Multirisk [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Robbery, theft and fire
Coverage period Jan. 1, 2020 to Jan. 1, 2021
Amount insured R$ 41,374 [1]
Annual premium R$ 448 [1]
Cemig Distribuicao [Member] | Warehouse Stores [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Fire
Coverage period Nov. 2, 2019 to Nov. 2, 2020
Amount insured R$ 120,007 [1]
Annual premium R$ 117 [1]
Cemig Distribuicao [Member] | Buildings [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Fire
Coverage period Jan. 8, 2019 to Jan. 8, 2020
Amount insured R$ 744,134 [1]
Annual premium R$ 201 [1]
Cemig Distribuicao [Member] | Telecoms Equipment [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Fire [2]
Amount insured R$ 31,083 [2]
Annual premium R$ 28 [2]
Cemig Distribuicao [Member] | Operational Risk [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Total [3]
Coverage period Dec. 7, 2019 to Dec. 7, 2020 [3]
Amount insured R$ 528,071 [3]
Annual premium R$ 695 [3]
Cemig Distribuicao [Member] | Air Transport Aircraft Guimbal Equipment [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Fuselage
Coverage period April 29, 2019 to 29-Apr-20
Amount insured R$ 3,370 [1]
Annual premium R$ 34 [1]
Cemig Distribuicao [Member] | Air Transport Aircraft Guimbal Equipment [Member]  
Disclosure of types of insurance contracts [line items]  
Coverage Third party
Coverage period April 29, 2019 to 29-Apr-20
Amount insured R$ 14,000 [1]
[1] Amounts expressed in R$ '000 or US$'000.
[2] Contracting of a new policy is in progress.
[3] Maximum indemnity limit: R$ 231.