XML 125 R104.htm IDEA: XBRL DOCUMENT
v3.25.1

Concession Financial and Sector Assets and Liabilities - Schedule of Changes in Concession Financial Assets (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | R$ 6,540 |  |
Amounts received | (343) | R$ (331) | R$ (309)
Classification as held for sale | (36) |  |
Ending balance | 8,072 | 6,540 |
Assets related to infrastructure [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 5,735 |  |
Ending balance | 6,776 | 5,735 |
Infrastructure [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 5,735 | 5,049 | 4,326
Transfers from contract assets | 782 | 363 | 670
Transfers from (to) intangible assets |  |  | (22)
Monetary updating | 641 | 654 | 556
Fair Value Adjustments |  |  | (172)
Disposals | (2) |  | (1)
Amounts received | (343) | (331) |
Classification as held for sale | (37) |  |
Ending balance | 6,776 | 5,735 | 5,049
Energy Distribution [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Classification as held for sale |  |  |
Energy Distribution [Member] | Infrastructure [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 1,881 | 1,370 | 684
Transfers from contract assets | 731 | 363 | 670
Transfers from (to) intangible assets |  |  | (22)
Monetary updating | 104 | 148 | 39
Fair Value Adjustments |  |  |
Disposals | (2) |  | (1)
Amounts received |  |  |
Ending balance | 2,714 | 1,881 | 1,370
Generation [member] | Infrastructure [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 3,816 | 3,642 | 3,608
Transfers from contract assets |  |  |
Transfers from (to) intangible assets |  |  |
Monetary updating | 534 | 505 | 514
Fair Value Adjustments |  |  | (172)
Disposals |  |  |
Amounts received | (343) | (331) | (308)
Classification as held for sale | (37) |  |
Ending balance | 3,970 | 3,816 | 3,642
Gas Distribution [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Classification as held for sale |  |  |
Gas Distribution [Member] | Infrastructure [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 38 | 37 | 34
Transfers from contract assets | 51 |  |
Transfers from (to) intangible assets |  |  |
Monetary updating | 3 | 1 | 3
Fair Value Adjustments |  |  |
Disposals |  |  |
Amounts received |  |  |
Ending balance | R$ 92 | R$ 38 | R$ 37

X
- Definition The amount of financial assets reclassified as held for sale. + References No definition available. + Details
Name: | cig_FinancialAssetsReclassifiedAsHeldForSale
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Ifrs Statement Line Items + References No definition available. + Details
Name: | cig_IfrsStatementLineItems
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Monetary Adjustment + References No definition available. + Details
Name: | cig_MonetaryAdjustment
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Transfers between property plant and equipment and concession contract assets. + References No definition available. + Details
Name: | cig_TransfersBetweenPropertyPlantAndEquipmentAndConcessionContractAssets
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Transfers between property plant and equipment financial assets and intangible assets + References No definition available. + Details
Name: | cig_TransfersBetweenPropertyPlantAndEquipmentFinancialAssetsAndIntangibleAssets
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Adjustments for fair value losses (gains) to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20_b&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AdjustmentsForFairValueGainsLosses
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Total for all subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 40 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_40_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ConsiderationPaidReceived
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Classes of financial instruments [domain]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35H&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35M&doctype=Standard -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35N&doctype=Standard -URIDate 2024-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35I&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_FinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The contractual amount outstanding on financial assets that were written off during the reporting period and are still subject to enforcement activity. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35L -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35L&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_FinancialAssetsWrittenOffDuringReportingPeriodAndStillSubjectToEnforcementActivityContractualAmountOutstanding
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_TypesOfFinancialAssetsAxis=cig_AssetsRelatedToInfrastuctureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfFinancialAssetsAxis=cig_InfrastructureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_EnergyDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=cig_GenerationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRateregulatedActivitiesAxis=ifrs-full_GasDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |