XML 106 R85.htm IDEA: XBRL DOCUMENT
v3.25.1

Operating Segments - Schedule of Operating Revenues, Costs and Expenses (Details) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 BRL (R$) Number | Dec. 31, 2023 BRL (R$) | Dec. 31, 2022 BRL (R$)
IfrsStatementLineItems [Line Items] |  |  |  |
NET REVENUE | R$ 39,820 |  | R$ 36,850 | R$ 34,463
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID | (21,978) |  | (19,822) | (20,020)
COSTS AND EXPENSES |  |  |  |
Personnel | (1,413) |  | (1,308) | (1,352)
Employees and managers' income sharing | (159) |  | (157) | (83)
Post-employment obligations | (484) |  | (591) | (626)
Materials, outsourced services and others expenses (revenues) | (2,813) |  | (2,228) | (2,370)
Depreciation and amortization | (1,376) |  | (1,274) | (1,182)
Operating provisions and impairment | (135) |  | (609) | (456)
Construction costs | (5,002) |  | (4,072) | (3,536)
Other revenues | 3,195 |  | 327 | 57
Total costs and expenses of operation | (8,187) |  | (10,239) | (9,605)
COSTS AND EXPENSES | (30,165) |  | (30,061) | (29,625)
Share of profit of equity-accounted investees and joint ventures, net of taxes | 224 |  | 432 | 843
Gains arising from the sale of non-current asset held for sale |  |  | 9 |
Fair value of business combination |  |  |  | (5)
Income before financial revenue (expenses) and taxes | 9,879 |  | 7,230 | 5,686
Finance net income (expenses) | (521) |  | (379) | (1,566)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX | 9,358 |  | 6,851 | 4,120
Income tax and social contribution tax | (2,239) |  | (1,084) | (26)
NET INCOME FOR THE YEAR | 7,119 |  | 5,767 | 4,094
Equity holders of the parent | 7,117 |  | 5,764 | 4,092
Non-controlling interests | R$ 2 |  | 3 | 2
Number Of Reportable Segments | Number | 6 |  |  |
Operating Segments [Member] | Energy Generation Segment [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
NET REVENUE | R$ 2,919 |  | 2,875 | 2,661
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID | (383) |  | (347) | (331)
COSTS AND EXPENSES |  |  |  |
Personnel | (150) | [1] | (148) | (162)
Employees and managers' income sharing | (18) |  | (16) | (15)
Post-employment obligations | (51) |  | (59) | (66)
Materials, outsourced services and others expenses (revenues) | (249) |  | (223) | (395)
Depreciation and amortization | (325) |  | (327) | (328)
Operating provisions and impairment | 8 | [2] | (29) | (18)
Construction costs |  |  |  |
Other revenues | 43 |  |  |
Total costs and expenses of operation | (742) |  | (802) | (984)
COSTS AND EXPENSES | (1,125) |  | (1,149) | (1,315)
Share of profit of equity-accounted investees and joint ventures, net of taxes |  |  | (2) | (2)
Gains arising from the sale of non-current asset held for sale |  |  |  |
Fair value of business combination |  |  |  |
Income before financial revenue (expenses) and taxes | 1,794 |  | 1,724 | 1,344
Finance net income (expenses) | (180) |  | (11) | (150)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX | 1,614 |  | 1,713 | 1,194
Income tax and social contribution tax | (334) |  | (326) | (307)
NET INCOME FOR THE YEAR | 1,280 |  | 1,387 | 887
Equity holders of the parent | 1,280 |  | 1,387 | 887
Non-controlling interests |  |  |  |
Operating Segments [Member] | Energy Transmission Segment [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
NET REVENUE | 1,293 |  | 1,091 | 1,195
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID |  |  |  |
COSTS AND EXPENSES |  |  |  |
Personnel | (149) |  | (137) | (135)
Employees and managers' income sharing | (16) |  | (16) | (11)
Post-employment obligations | (32) |  | (36) | (42)
Materials, outsourced services and others expenses (revenues) | (97) |  | (88) | (96)
Depreciation and amortization | (9) |  | (1) |
Operating provisions and impairment | 5 |  | (14) | (3)
Construction costs | (290) |  | (172) | (291)
Other revenues | 1,521 |  |  |
Total costs and expenses of operation | 933 |  | (464) | (578)
COSTS AND EXPENSES | 933 |  | (464) | (578)
Share of profit of equity-accounted investees and joint ventures, net of taxes |  |  |  | 3
Gains arising from the sale of non-current asset held for sale |  |  |  |
Fair value of business combination |  |  |  |
Income before financial revenue (expenses) and taxes | 2,226 |  | 627 | 620
Finance net income (expenses) | (108) |  | (48) | (96)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX | 2,118 |  | 579 | 524
Income tax and social contribution tax | (557) |  | (114) | (174)
NET INCOME FOR THE YEAR | 1,561 |  | 465 | 350
Equity holders of the parent | 1,561 |  | 465 | 350
Non-controlling interests |  |  |  |
Operating Segments [Member] | Energy Trading Segment [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
NET REVENUE | 7,279 |  | 7,686 | 7,918
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID | (6,509) |  | (6,318) | (6,880)
COSTS AND EXPENSES |  |  |  |
Personnel | (29) |  | (27) | (12)
Employees and managers' income sharing | (2) |  | (3) | (6)
Post-employment obligations | (7) |  | (8) | (10)
Materials, outsourced services and others expenses (revenues) | (26) |  | (18) | (14)
Depreciation and amortization |  |  |  |
Operating provisions and impairment | (76) |  | (7) | (34)
Construction costs |  |  |  |
Other revenues |  |  |  |
Total costs and expenses of operation | (140) |  | (63) | (76)
COSTS AND EXPENSES | (6,649) |  | (6,381) | (6,956)
Share of profit of equity-accounted investees and joint ventures, net of taxes |  |  |  |
Gains arising from the sale of non-current asset held for sale |  |  |  |
Fair value of business combination |  |  |  |
Income before financial revenue (expenses) and taxes | 630 |  | 1,305 | 962
Finance net income (expenses) | 24 |  | 82 | 34
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX | 654 |  | 1,387 | 996
Income tax and social contribution tax | (136) |  | (428) | (314)
NET INCOME FOR THE YEAR | 518 |  | 959 | 682
Equity holders of the parent | 518 |  | 959 | 682
Non-controlling interests |  |  |  |
Operating Segments [Member] | Energy Distribution Segment [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
NET REVENUE | 26,617 |  | 23,348 | 20,919
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID | (14,735) |  | (12,656) | (11,938)
COSTS AND EXPENSES |  |  |  |
Personnel | (968) |  | (875) | (913)
Employees and managers' income sharing | (104) |  | (102) | (40)
Post-employment obligations | (323) |  | (400) | (421)
Materials, outsourced services and others expenses (revenues) | (2,295) |  | (2,157) | (1,786)
Depreciation and amortization | (922) |  | (834) | (738)
Operating provisions and impairment | (8) |  | (455) | (398)
Construction costs | (4,379) |  | (3,600) | (3,193)
Other revenues |  |  |  |
Total costs and expenses of operation | (8,999) |  | (8,423) | (7,489)
COSTS AND EXPENSES | (23,734) |  | (21,079) | (19,427)
Share of profit of equity-accounted investees and joint ventures, net of taxes |  |  |  |
Gains arising from the sale of non-current asset held for sale |  |  |  |
Fair value of business combination |  |  |  |
Income before financial revenue (expenses) and taxes | 2,883 |  | 2,269 | 1,492
Finance net income (expenses) | (17) |  | (253) | (1,115)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX | 2,866 |  | 2,016 | 377
Income tax and social contribution tax | (662) |  | (405) | 67
NET INCOME FOR THE YEAR | 2,204 |  | 1,611 | 444
Equity holders of the parent | 2,204 |  | 1,611 | 444
Non-controlling interests |  |  |  |
Operating Segments [Member] | Gas Segment [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
NET REVENUE | 3,477 |  | 3,618 | 3,690
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID | (2,127) |  | (2,237) | (2,735)
COSTS AND EXPENSES |  |  |  |
Personnel | (73) |  | (73) | (66)
Employees and managers' income sharing |  |  |  |
Post-employment obligations |  |  |  |
Materials, outsourced services and others expenses (revenues) | (83) |  | (63) | (57)
Depreciation and amortization | (98) |  | (94) | (91)
Operating provisions and impairment | (1) |  | 2 |
Construction costs | (333) |  | (300) | (52)
Other revenues |  |  |  |
Total costs and expenses of operation | (588) |  | (528) | (266)
COSTS AND EXPENSES | (2,715) |  | (2,765) | (3,001)
Share of profit of equity-accounted investees and joint ventures, net of taxes |  |  |  |
Gains arising from the sale of non-current asset held for sale |  |  |  |
Fair value of business combination |  |  |  |
Income before financial revenue (expenses) and taxes | 762 |  | 853 | 689
Finance net income (expenses) | (52) |  | (9) | (9)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX | 710 |  | 844 | 680
Income tax and social contribution tax | (213) |  | (248) | (199)
NET INCOME FOR THE YEAR | 497 |  | 596 | 481
Equity holders of the parent | 495 |  | 593 | 479
Non-controlling interests | 2 |  | 3 | 2
Operating Segments [Member] | Investees Segment [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
NET REVENUE | 131 |  | 18 | 7
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID | (86) |  | (4) | (1)
COSTS AND EXPENSES |  |  |  |
Personnel | (44) |  | (48) | (64)
Employees and managers' income sharing | (19) |  | (20) | (11)
Post-employment obligations | (71) |  | (88) | (87)
Materials, outsourced services and others expenses (revenues) | (97) |  | 275 | (84)
Depreciation and amortization | (22) |  | (18) | (25)
Operating provisions and impairment | (63) |  | (106) | (3)
Construction costs |  |  |  |
Other revenues | 1,631 |  |  |
Total costs and expenses of operation | 1,315 |  | (5) | (274)
COSTS AND EXPENSES | 1,229 |  | (9) | (275)
Share of profit of equity-accounted investees and joint ventures, net of taxes | 224 |  | 434 | 842
Gains arising from the sale of non-current asset held for sale |  |  | 9 |
Fair value of business combination |  |  |  | (5)
Income before financial revenue (expenses) and taxes | 1,584 |  | 452 | 579
Finance net income (expenses) | (188) |  | (140) | (230)
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX | 1,396 |  | 312 | 349
Income tax and social contribution tax | (337) |  | 437 | 901
NET INCOME FOR THE YEAR | 1,059 |  | 749 | 1,250
Equity holders of the parent | 1,059 |  | 749 | 1,250
Non-controlling interests |  |  |  |
Eliminations [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
NET REVENUE | (1,896) | [3] | (1,786) | (1,927)
COST OF ENERGY, GAS AND CHARGES FOR USE OF THE NATIONAL GRID | 1,862 |  | 1,740 | 1,865
COSTS AND EXPENSES |  |  |  |
Personnel |  |  |  |
Employees and managers' income sharing |  |  |  |
Post-employment obligations |  |  |  |
Materials, outsourced services and others expenses (revenues) | 34 |  | 46 | 62
Depreciation and amortization |  |  |  |
Operating provisions and impairment |  |  |  |
Construction costs |  |  |  |
Other revenues |  |  |  |
Total costs and expenses of operation | 34 |  | 46 | 62
COSTS AND EXPENSES | 1,896 |  | 1,786 | 1,927
Share of profit of equity-accounted investees and joint ventures, net of taxes |  |  |  |
Gains arising from the sale of non-current asset held for sale |  |  |  |
Fair value of business combination |  |  |  |
Income before financial revenue (expenses) and taxes |  |  |  |
Finance net income (expenses) |  |  |  |
INCOME BEFORE INCOME TAX AND SOCIAL CONTRIBUTION TAX |  |  |  |
Income tax and social contribution tax |  |  |  |
NET INCOME FOR THE YEAR |  |  |  |
Equity holders of the parent |  |  |  |
Non-controlling interests |  |  |  |
[1] | The information on operational costs and expenses separated by type is segregated in accordance with the internal business model, which has immaterial differences in relation to the accounting information.
[2] | Includes the impairment loss on Cemig GT’s investment in Aliança Norte, disclosed in Investees Segment.
[3] | The reconciliation between the values of the reportable segments and the accounting information on revenues and costs reflects the elimination of intercompany transactions.

X
- Definition Adjustments for provisions one + References No definition available. + Details
Name: | cig_AdjustmentsForProvisionsOne
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Construction contracts costs. + References No definition available. + Details
Name: | cig_ConstructionContractsCosts
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Cost Of Energy Gas And Charges For Use Of National Grid + References No definition available. + Details
Name: | cig_CostOfEnergyGasAndChargesForUseOfNationalGrid
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Costs and expenses. + References No definition available. + Details
Name: | cig_CostsAndExpenses1
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Expense from share-based payment transactions with employees one + References No definition available. + Details
Name: | cig_ExpenseFromSharebasedPaymentTransactionsWithEmployeesOne
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair Value Of Business Combination + References No definition available. + Details
Name: | cig_FairValueOfBusinessCombination
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gains Arising From Sale Of Noncurrent Asset Held For Sale 1 + References No definition available. + Details
Name: | cig_GainsArisingFromSaleOfNoncurrentAssetHeldForSale1
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 Income before financial revenue expenses and taxes. + References No definition available. + Details
Name: | cig_IncomeBeforeFinancialRevenueExpensesAndTaxes
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the number of reportable segments. + References No definition available. + Details
Name: | cig_NumberOfReportableSegments1
Namespace Prefix: | cig_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Other cost. + References No definition available. + Details
Name: | cig_OtherCostAbstract
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Personnel expenses one + References No definition available. + Details
Name: | cig_PersonnelExpensesOne
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of depreciation and amortisation expense. Depreciation and amortisation are the systematic allocations of depreciable amounts of assets over their useful lives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 28 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_28_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23_e&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B13 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B13_d&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 102 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_102&doctype=Standard -URIDate 2024-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 99 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_99&doctype=Standard -URIDate 2024-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 104 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_104&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_DepreciationAndAmortisationExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of income or cost associated with interest and other financing activities of the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_85&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_FinanceIncomeCost
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23_h&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2024-01-01 -Paragraph 35 -Subparagraph b -Clause viii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=26&code=ifrs-tx-2024-en-r&anchor=para_35_b_viii&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 79 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_79&doctype=Standard -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2024-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2024-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B13 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B13_g&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 82 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_82_d&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_IncomeTaxExpenseContinuingOperations
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of miscellaneous other operating income. [Refer: Other operating income (expense)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_MiscellaneousOtherOperatingIncome
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of all operating expenses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_85&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_OperatingExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of post-employment benefit expense included in profit or loss + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 5 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_5&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PostemploymentBenefitExpenseInProfitOrLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total of income less expenses from continuing and discontinued operations, excluding the components of other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 18 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_18_b&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2024-01-01 -Paragraph 32 -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2024-en-r&anchor=para_32_a_ii&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2024-01-01 -Paragraph 24 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2024-en-r&anchor=para_24_b&doctype=Standard -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 28 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_28_b&doctype=Standard -URIDate 2024-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23&doctype=Standard -URIDate 2024-03-27 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B10 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 113 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_113_b&doctype=Standard -URIDate 2024-03-27 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 81A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_81A_a&doctype=Standard -URIDate 2024-03-27 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 106 -Subparagraph d -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_106_d_i&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ProfitLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The profit (loss) from continuing and discontinued operations attributable to non-controlling interests. [Refer: Profit (loss); Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph 12 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_12_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 81B -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_81B_a_i&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ProfitLossAttributableToNoncontrollingInterests
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 81B -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_81B_a_ii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ProfitLossAttributableToOwnersOfParent
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The profit (loss) before tax expense or income. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 28 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_28_b&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2024-01-01 -Paragraph 33 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2024-en-r&anchor=para_33_b_i&doctype=Standard -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 103 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_103&doctype=Standard -URIDate 2024-03-27 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 102 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_102&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ProfitLossBeforeTax
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of raw materials and consumables used in the production process or in the rendering of services. [Refer: Current raw materials] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 102 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_102&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 99 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_99&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_RawMaterialsAndConsumablesUsed
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 28 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_28_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23_a&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 32 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_32&doctype=Standard -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 33 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_33_a&doctype=Standard -URIDate 2024-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 34 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_34&doctype=Standard -URIDate 2024-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2024-01-01 -Paragraph 33 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2024-en-r&anchor=para_33_b_i&doctype=Standard -URIDate 2024-03-27 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B12 -Subparagraph b -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B12_b_v&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B10 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 82 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_82_a&doctype=Standard -URIDate 2024-03-27 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 103 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_103&doctype=Standard -URIDate 2024-03-27 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 102 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_102&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_Revenue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Total for all associates [member]; Investments accounted for using equity method; Total for all joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 28 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_28_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23_g&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 82 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_82_c&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_SegmentConsolidationItemsAxis=ifrs-full_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cig_EnergyGenerationSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cig_EnergyTransmissionSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cig_EnergyTradingSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cig_EnergyDistributionSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cig_GasSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cig_InvesteesSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentConsolidationItemsAxis=ifrs-full_EliminationOfIntersegmentAmountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |