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Revenue - Schedule of Other Operating Revenues (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Total R$ 2,906 R$ 2,316 R$ 2,658
Products [Member]      
IfrsStatementLineItems [Line Items]      
Charged service 18 21 19
Services rendered 98 85 66
Low-income subsidy 463 401 321
Subsidy SCEE (14) [1] 129
Subsidy Eletrobras 104 51 432
Tariff flags subsidy 153 78 290
CDE subsidy to cover tariff discounts 1,334 984 931
Subsidies associated with the EUST 71 47 31
Rental and leasing 562 412 493
Contractual indemnities 0 6
Others R$ 117 R$ 102 R$ 75
[1] The variation arises from Cemig D's Annual Tariff Readjustment.