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Operating Costs, Expenses and Other Revenue - Schedule of Other Operating Expenses (Revenues), Net (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of attribution of expenses by nature to their function [line items]      
Personnel R$ 1,399 R$ 1,308 R$ 1,352
Employees’ and managers’ income sharing 172 157 83
Post-employment benefits (Note 23) 484 591 626
Materials 135 140 148
Outsourced services 2,142 1,902 1,706
Depreciation and amortization 1,376 1,274 1,182
Provisions (Reversals) (28) (434) (401)
Impairment 46
Expected credit losses of accounts receivable 175 175 109
Provision for losses with related party - Renova 1 (54)
Reversal of provision with related party (58)
Write-off of financial asset 172
Other costs and expenses 537 503 396
Total 6,380 6,485 6,121
Operating Cost [Member]      
Disclosure of attribution of expenses by nature to their function [line items]      
Personnel 1,053 1,000 976
Employees’ and managers’ income sharing 131
Post-employment benefits (Note 23) 15
Materials 118 100 93
Outsourced services 1,866 1,652 1,433
Depreciation and amortization 1,352 1,247 1,110
Provisions (Reversals) (163) [1] (333) (278)
Impairment [2]
Expected credit losses of accounts receivable
Provision for losses with related party - Renova
Reversal of provision with related party [3]
Write-off of financial asset
Other costs and expenses 312 240 205
Total 4,684 4,572 4,095
Expected Credit Loss [Member]      
Disclosure of attribution of expenses by nature to their function [line items]      
Personnel
Employees’ and managers’ income sharing
Post-employment benefits (Note 23)
Materials
Outsourced services
Depreciation and amortization
Provisions (Reversals)
Impairment
Expected credit losses of accounts receivable 175 175 109
Provision for losses with related party - Renova
Reversal of provision with related party
Write-off of financial asset
Other costs and expenses
Total 175 175 109
General And Administrative Expenses [Member]      
Disclosure of attribution of expenses by nature to their function [line items]      
Personnel 346 308 376
Employees’ and managers’ income sharing 41 4
Post-employment benefits (Note 23) 5
Materials 17 40 55
Outsourced services 276 250 273
Depreciation and amortization 24 27 72
Provisions (Reversals)
Impairment
Expected credit losses of accounts receivable
Provision for losses with related party - Renova
Reversal of provision with related party
Write-off of financial asset
Other costs and expenses 111 82 9
Total 820 707 789
Other Operating Expenses (Revenue) [Member]      
Disclosure of attribution of expenses by nature to their function [line items]      
Personnel
Employees’ and managers’ income sharing 157 79
Post-employment benefits (Note 23) 464 591 626
Materials
Outsourced services
Depreciation and amortization
Provisions (Reversals) (135) (101) (123)
Impairment 46
Expected credit losses of accounts receivable
Provision for losses with related party - Renova 1 (54)
Reversal of provision with related party (58)
Write-off of financial asset 172
Other costs and expenses 114 181 182
Total R$ 701 R$ 1,031 R$ 1,128
[1]

This variation is basically due to the reversal of a tax contingency arising from a decision in favor of the company in the lower court, which ordered the cancellation of the collection and the extinction of the tax execution of a lawsuit related to social security contributions on Profit Sharing (PLR). For more details, see note 24.
[2] This amount includes: i. R$41 relating to the recognition of impairment losses on the capital gain of Aliança Norte. For more details, see note 14. This loss is presented in the Operating Segments note as part of the investees segment. ii. R$5 referring to outstanding debts with customer, due to disagreement in values. Arbitration procedure was initiated by the customer.
[3] Refers to contractual obligations towards the investee Aliança Geração corresponding to contingencies whose triggering event is events that occurred before the closing of the transaction that resulted in the contribution of assets by Cemig GT and Vale S.A. in the capital of this investee On March 27, 2024, the CCVA was signed for the sale of the stake held by Cemig GT in the share capital of Aliança Geração to Vale S.A.. On August 13, 2024, with the conclusion of the sale, Vale S.A. and Cemig GT jointly signed an agreement to extinguish and discharge these contingencies, which resulted in the reversal of the provision in August 2024.