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Concession Financial and Sector Assets and Liabilities - Schedule of Changes in Concession Financial Assets Related to Concession Grant Fee (Details) - BRL (R$) R$ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 20, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
IfrsStatementLineItems [Line Items] |  |  |  |
Beginning Balance |  | R$ 2,950 | R$ 2,792 | R$ 2,550
Monetary updating |  | 412 | 467 | 523
Interest |  |  | 467 | 523
Amounts received | R$ 47 | (331) | (309) | (281)
Ending Balance |  | 3,031 | 2,950 | 2,792
Cemig Geracao Tres Marias S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Beginning Balance |  | 1,672 | 1,584 | 1,447
Monetary updating |  | 222 |  |
Interest |  |  | 254 | 287
Amounts received |  | (178) | (166) | (150)
Ending Balance |  | 1,716 | 1,672 | 1,584
Cemig geracao salto grande sa [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Beginning Balance |  | 525 | 497 | 454
Monetary updating |  | 70 |  |
Interest |  |  | 80 | 90
Amounts received |  | (56) | (52) | (47)
Ending Balance |  | 539 | 525 | 497
Cemig Geracao Itutinga S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Beginning Balance |  | 198 | 187 | 171
Monetary updating |  | 30 |  |
Interest |  |  | 33 | 37
Amounts received |  | (24) | (22) | (21)
Ending Balance |  | 204 | 198 | 187
Cemig Geracao Camargos S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Beginning Balance |  | 148 | 140 | 128
Monetary updating |  | 22 |  |
Interest |  |  | 25 | 27
Amounts received |  | (18) | (17) | (15)
Ending Balance |  | 152 | 148 | 140
Cemig Geracao Sul S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Beginning Balance |  | 195 | 184 | 167
Monetary updating |  | 31 |  |
Interest |  |  | 34 | 38
Amounts received |  | (25) | (23) | (21)
Ending Balance |  | 201 | 195 | 184
Cemig Geracao Leste S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Beginning Balance |  | 133 | 125 | 114
Monetary updating |  | 23 |  |
Interest |  |  | 26 | 27
Amounts received |  | (19) | (18) | (16)
Ending Balance |  | 137 | 133 | 125
Cemig Geracao Oeste S A [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Beginning Balance |  | 79 | 75 | 69
Monetary updating |  | 14 |  |
Interest |  |  | 15 | 17
Amounts received |  | (11) | (11) | (11)
Ending Balance |  | R$ 82 | R$ 79 | R$ 75

X
- Definition Auction concession. + References No definition available. + Details
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- Definition The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 40 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_40_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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