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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.

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