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Related Party Transactions (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Assets 1 [Member]    
IfrsStatementLineItems [Line Items]    
Operating leasing non current R$ 185 R$ 182
Assets 1 [Member] | Alianca Geracao [Member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy 3 4
Provision of services 1 1
Assets 1 [Member] | Norte Energia [Member]    
IfrsStatementLineItems [Line Items]    
Transmission charges 3 2
Assets 1 [Member] | Hidreletrica pipoca [member]    
IfrsStatementLineItems [Line Items]    
Interest on Equity, and dividends   4
Assets 1 [Member] | Hidreletrica cachoeirao [member]    
IfrsStatementLineItems [Line Items]    
Interest on Equity, and dividends   4
Assets 1 [Member] | Retiro Baixo [Member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy   1
Interest on Equity, and dividends   6
Assets 1 [Member] | Governodo Estadode Minas Gerais [Member]    
IfrsStatementLineItems [Line Items]    
Customers and traders 45 37
Accounts Receivable 13 13
Assets 1 [Member] | Fip Melbourne [Member]    
IfrsStatementLineItems [Line Items]    
Other credits   161
Assets 1 [Member] | F I C Pampulha [Member]    
IfrsStatementLineItems [Line Items]    
Cash and cash equivalents 351 294
Marketable securities 771 1,743
Marketable securities non current   7
Liabilities 1 [Member]    
IfrsStatementLineItems [Line Items]    
Operating leasing 27 26
Operating leasing non current 187 179
Liabilities 1 [Member] | Alianca Geracao [Member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy 22 19
Provision of legal services 59 55
Liabilities 1 [Member] | Norte Energia [Member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy 31 30
Liabilities 1 [Member] | Paracambi [Member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy 2 2
Liabilities 1 [Member] | Hidreletrica pipoca [member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy 3 3
Liabilities 1 [Member] | Retiro Baixo [Member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy   1
Liabilities 1 [Member] | Taesa [Member]    
IfrsStatementLineItems [Line Items]    
Transmission charges 12 12
Liabilities 1 [Member] | Forluz [Member]    
IfrsStatementLineItems [Line Items]    
Post-employment obligations [1] 126 199
Post-employment obligations [1] 2,230 2,120
Liabilities 1 [Member] | C E M I G Saude [Member]    
IfrsStatementLineItems [Line Items]    
Health plan and dental plan current [2] 230 218
Health plan and dental plan non current [2] 2,830 3,156
Revenue 1 [Member] | Alianca Geracao [Member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy 49 56
Provision of services 7 6
Revenue 1 [Member] | Norte Energia [Member]    
IfrsStatementLineItems [Line Items]    
Transmission charges 30 26
Revenue 1 [Member] | Hidreletrica pipoca [member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy 2 1
Revenue 1 [Member] | Hidreletrica cachoeirao [member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy 2 2
Revenue 1 [Member] | Retiro Baixo [Member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy 5 7
Revenue 1 [Member] | Taesa [Member]    
IfrsStatementLineItems [Line Items]    
Provision of services 2 1
Revenue 1 [Member] | Alianca [member]    
IfrsStatementLineItems [Line Items]    
Transmission charges 1 1
Revenue 1 [Member] | Governodo Estadode Minas Gerais [Member]    
IfrsStatementLineItems [Line Items]    
Customers and traders 194 166
Accounts Receivable   3
Revenue 1 [Member] | F I C Pampulha [Member]    
IfrsStatementLineItems [Line Items]    
Marketable securities 26 77
Expenses 1 [Member]    
IfrsStatementLineItems [Line Items]    
Operating leasing (33) (31)
Expenses 1 [Member] | Alianca Geracao [Member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy (234) (222)
Provision of legal services (3) (3)
Expenses 1 [Member] | Norte Energia [Member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy (278) (260)
Expenses 1 [Member] | Paracambi [Member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy (30) (33)
Expenses 1 [Member] | Hidreletrica pipoca [member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy (47) (46)
Expenses 1 [Member] | Retiro Baixo [Member]    
IfrsStatementLineItems [Line Items]    
Transactions with energy (6) (6)
Expenses 1 [Member] | Taesa [Member]    
IfrsStatementLineItems [Line Items]    
Connection charges (6) (4)
Transmission charges (138) (135)
Expenses 1 [Member] | Forluz [Member]    
IfrsStatementLineItems [Line Items]    
Post-employment obligations [1] (280) (285)
Supplementary pension contributions - Defined contribution plan [3] (81) (80)
Administrative running costs [4] (40) (36)
Expenses 1 [Member] | C E M I G Saude [Member]    
IfrsStatementLineItems [Line Items]    
Health plan and dental plan current [2] R$ (388) R$ (385)
[1] Forluz's contracts are adjusted by the Broad National Consumer Price Index - IPCA of the Brazilian Institute of Geography and Statistics - IBGE, plus interest of 6% per year and will be amortized until 2031 (see note 15);
[2] Post-employment obligations related to the employees' health and dental plan (see note 15).
[3] Company's contributions to the Pension Fund regarding the employees participating in the Mixed Plan and calculated over monthly remunerations in conformity with the Fund's regulation;
[4] Funds for the annual administrative funding of the Pension Fund in accordance with the specific legislation for the sector. The amounts are estimated as a percentage of the Company's payroll;