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Concession Contract Assets - Schedule of Contract Assets (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Balances |  | R$ 8,526 |  | R$ 6,704 | R$ 6,380 |
Additions |  | 4,940 |  | 3,990 | 3,566 |
Inflation adjustment |  | 433 |  | 524 | 575 |
Results of the Periodic Tariff Review |  | 1,676 |  |  |  |
Amounts received |  | (799) |  | (746) | (608) |
Disposals |  |  |  |  | (3) |
Others additions |  |  |  |  | 5 |
Transfers to financial assets |  | (782) |  | (364) | (762) |
Transfers to intangible assets |  | (2,516) |  | (1,590) | (2,448) |
Impairment |  | (11) |  | (8) | (1) |
Balances |  | 11,467 |  | 8,526 | 6,704 |
Transmission Segment [Member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Balances |  | 4,757 |  | 4,737 | 4,358 |
Additions |  | 425 | [1] | 242 | 407 |
Inflation adjustment |  | 433 |  | 524 | 575 |
Results of the Periodic Tariff Review | [2] | 1,676 |  |  |  |
Amounts received |  | (799) |  | (746) | (608) |
Disposals |  |  |  |  |  |
Others additions |  |  |  |  | 5 |
Transfers to financial assets |  |  |  |  |  |
Transfers to intangible assets |  |  |  |  |  |
Impairment |  |  |  |  |  | [3]
Balances |  | 6,492 |  | 4,757 | 4,737 |
Distribution Segment [Member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Balances |  | 3,431 |  | 1,850 | 1,927 |
Additions |  | 4,167 |  | 3,478 | 3,098 |
Inflation adjustment |  |  |  |  |  |
Results of the Periodic Tariff Review |  |  |  |  |  |
Amounts received |  |  |  |  |  |
Disposals |  |  |  |  |  |
Others additions |  |  |  |  |  |
Transfers to financial assets |  | (731) |  | (364) | (762) |
Transfers to intangible assets |  | (2,435) |  | (1,541) | (2,412) |
Impairment |  | (11) |  | (8) | (1) |
Balances |  | 4,421 |  | 3,431 | 1,850 |
Gas And Power Segment [Member] |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |
Balances |  | 338 |  | 117 | 95 |
Additions |  | 348 |  | 270 | 61 |
Inflation adjustment |  |  |  |  |  |
Results of the Periodic Tariff Review |  |  |  |  |  |
Amounts received |  |  |  |  |  |
Disposals |  |  |  |  | (3) |
Others additions |  |  |  |  |  |
Transfers to financial assets |  | (51) |  |  |  |
Transfers to intangible assets |  | (81) |  | (49) | (36) |
Impairment |  |  |  |  |  |
Balances |  | R$ 554 |  | R$ 338 | R$ 117 |
[1] | The higher volume of additions in the distribution segment reflects greater investments made, in line with the investment program of Cemig D.
[2] | In Note 27d, this amount is presented net of PIS/Pasep and Cofins taxes.
[3] | This refers to posting or reversal of provisions made for losses in relation to contractual assets in progress (canceled works).

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