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33. INSURANCE (Details) - 12 months ended Dec. 31, 2020
R$ in Millions, $ in Millions
USD ($)
BRL (R$)
BRL (R$)
Companhia energetica de minas gerais [member] | Facilities in buildings [member]      
Disclosure of types of insurance contracts [line items]      
Coverage Fire Fire  
Coverage period Jan. 8, 2021 to Jan. 8, 2022 Jan. 8, 2021 to Jan. 8, 2022  
Amount insured [1]     R$ 8,661
Annual premium [1]   R$ 2  
Cemig Geracao E Transmissao [member] | Air transport / Aircraft [member]      
Disclosure of types of insurance contracts [line items]      
Coverage Fuselage Third party Fuselage Third party  
Coverage period April 29, 2020 to April 29, 2021 April 29, 2020 to April 29, 2021  
Amount insured | $ [1] $ 1,140    
Annual premium | $ [1] $ 24    
Cemig Geracao E Transmissao [member] | Air transport / Aircraft [member]      
Disclosure of types of insurance contracts [line items]      
Coverage Fuselage Third party Fuselage Third party  
Coverage period April 29, 2020 to April 29, 2021 April 29, 2020 to April 29, 2021  
Amount insured | $ [1] $ 4,000    
Annual premium | $ [1] $ 24    
Cemig Geracao E Transmissao [member] | Warehouse stores [member]      
Disclosure of types of insurance contracts [line items]      
Coverage Fire Fire  
Coverage period Nov. 2, 2020 to Nov. 2, 2021 Nov. 2, 2020 to Nov. 2, 2021  
Amount insured [1]     18,981
Annual premium [1]   R$ 17  
Cemig Geracao E Transmissao [member] | Buildings [member]      
Disclosure of types of insurance contracts [line items]      
Coverage Fire Fire  
Coverage period Jan. 8, 2021 to Jan. 8, 2022 Jan. 8, 2021 to Jan. 8, 2022  
Amount insured [1]     240,527
Annual premium [1]   R$ 70  
Cemig Geracao E Transmissao [member] | Telecoms equipment [member]      
Disclosure of types of insurance contracts [line items]      
Coverage [2] Fire Fire  
Coverage period [2] Jan. 8, 2020 to Jan. 8, 2021 Jan. 8, 2020 to Jan. 8, 2021  
Amount insured [1],[2]     2,650
Annual premium [1],[2]   R$ 2  
Cemig Geracao E Transmissao [member] | Operational risk [member]      
Disclosure of types of insurance contracts [line items]      
Coverage [3]  
Coverage period Dec. 7, 2020 to Dec. 7, 2021 Dec. 7, 2020 to Dec. 7, 2021  
Amount insured [1]     75,118
Annual premium [1]   R$ 941  
Cemig distribuicao [member] | Warehouse stores [member]      
Disclosure of types of insurance contracts [line items]      
Coverage Fire Fire  
Coverage period Nov. 2, 2020 to Nov. 2, 2021 Nov. 2, 2020 to Nov. 2, 2021  
Amount insured [1]     74,575
Annual premium [1]   R$ 68  
Cemig distribuicao [member] | Buildings [member]      
Disclosure of types of insurance contracts [line items]      
Coverage Fire Fire  
Coverage period Jan. 8, 2021 to Jan. 8, 2022 Jan. 8, 2021 to Jan. 8, 2022  
Amount insured [1]     616,157
Annual premium [1]   R$ 179  
Cemig distribuicao [member] | Telecoms equipment [member]      
Disclosure of types of insurance contracts [line items]      
Coverage [2] Fire Fire  
Coverage period [2] Jul. 8, 2020 to Jul. 8, 2021 Jul. 8, 2020 to Jul. 8, 2021  
Amount insured [1],[2]     31,082
Annual premium [1],[2]   R$ 28  
Cemig distribuicao [member] | Operational risk [member]      
Disclosure of types of insurance contracts [line items]      
Coverage Total Total  
Coverage period Dec. 7, 2020 to Dec. 7, 2021 Dec. 7, 2020 to Dec. 7, 2021  
Amount insured [1]     545,062
Annual premium [1]   R$ 717  
Cemig distribuicao [member] | Air transport / Aircraft / Guimbal equipment [member]      
Disclosure of types of insurance contracts [line items]      
Coverage Fuselage Third party Fuselage Third party  
Coverage period April 29, 2020 to April 29, 2021 April 29, 2020 to April 29, 2021  
Amount insured | $ [1] $ 3,370    
Annual premium | $ [1] $ 51    
Cemig distribuicao [member] | Air transport / Aircraft / Guimbal equipment [member]      
Disclosure of types of insurance contracts [line items]      
Coverage Fuselage Third party Fuselage Third party  
Coverage period April 29, 2020 to April 29, 2021 April 29, 2020 to April 29, 2021  
Amount insured | $ [1] $ 14,000    
Annual premium | $ [1] $ 51    
Gasmig [member] | Gas distribution network third party [member]      
Disclosure of types of insurance contracts [line items]      
Coverage Third party Third party  
Coverage period Dec. 15, 2020 to Dec. 15, 2021 Dec. 15, 2020 to Dec. 15, 2021  
Amount insured [1]     60,000
Annual premium [1]   R$ 378  
Gasmig [member] | Own vehicle fleet (operation) [member]      
Disclosure of types of insurance contracts [line items]      
Coverage Damage to third parties only Damage to third parties only  
Coverage period Jul. 7, 2020 to Jul. 7, 2021 Jul. 7, 2020 to Jul. 7, 2021  
Amount insured [1]     500
Annual premium [1]   R$ 3  
Gasmig [member] | Own vehicle fleet (Directors) [member]      
Disclosure of types of insurance contracts [line items]      
Coverage Full cover Full cover  
Coverage period Oct. 25, 2020 to Oct. 25, 2021 Oct. 25, 2020 to Oct. 25, 2021  
Amount insured [1]     100
Annual premium [1]   R$ 2  
Gasmig [member] | Facilities multirisk [member]      
Disclosure of types of insurance contracts [line items]      
Coverage Robbery, theft and fire Robbery, theft and fire  
Coverage period Dec. 31, 2020 to Dec. 31, 2021 Dec. 31, 2020 to Dec. 31, 2021  
Amount insured [1]     R$ 32,667
Annual premium [1]   R$ 39  
[1] Amounts expressed in R$ '000 or US$'000.
[2] Contracting of a new policy is in progress
[3] Maximum indemnity limit: R$231.