XML 207 R186.htm IDEA: XBRL DOCUMENT
v3.21.1

26. EQUITY AND REMUNERATION TO SHAREHOLDERS (Details 6) - BRL (R$) R$ / shares in Units, R$ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2021 | Jan. 02, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Dividends [line items] |  |  |  |  |  |  |  |  |
Equity |  |  |  | R$ 17,478 | R$ 15,891 | [1],[2] | R$ 15,939 | [3] |
Net income for the year |  |  |  | 2,864 |  |  |  |  |
Unrealized profit reserve | R$ 835 |  |  | (835) |  |  |  |  |
Reversal of the unrealized profit reserve established in 2019 |  |  |  | 835 |  |  |  |  |
Withholding income tax on Interest on equity |  |  |  | 50 | 35 |  | 17 |  |
Minimum Dividend under the by-laws including income tax on interest on equity |  |  |  | 1,482 |  |  |  |  |
Dividends recorded, as specified in the by-laws Interest on Equity |  |  |  | 553 | 400 |  | 210 |  |
Ordinary dividends |  |  |  | 929 |  |  |  |  |
Total dividends for the common shares |  |  |  |  | R$ 364 |  |  |  |
Restated [member] |  |  |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |  |  |
Percentage applied to the nominal value of the preferred shares |  |  |  |  | 6.00% |  |  |  |
Equity |  | R$ 16,084 | [1] |  | R$ 16,103 | [1] | 16,084 | [3] | R$ 14,296
Net income for the year |  | R$ 1,722 | [2] |  | 3,194 | [1] | 1,722 | [1] |
Unrealized profit reserve |  |  |  |  |  |  | 835 |  |
Minimum Dividend under the by-laws including income tax on interest on equity |  |  |  |  | 764 |  | 867 |  |
Ordinary dividends |  |  |  |  | R$ 364 |  | R$ 657 |  |
Mandatory dividends (including withholding income tax on Interest on Equity) |  |  |  |  | R$ 0.59 |  | R$ 0.52 |  |
Preferred Shares [member] |  |  |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |  |  |
Percentage applied to the nominal value of the preferred shares |  |  |  |  | 10.00% |  | 10.00% |  |
Percentage applied to the portion of Equity represented by the preferred shares |  |  |  |  | 3.00% |  | 3.00% |  |
Amount of the dividends by the second payment criterion |  |  |  |  | R$ 317 |  |  |  |
Minimum Dividends required by the Bylaws for the preferred shares |  |  |  |  | 486 |  |  |  |
Mandatory dividends - 50% of Net income |  |  |  |  | 1,564 |  |  |  |
Preferred Shares [member] |  |  |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |  |  |
Total dividends for the common shares |  |  |  | R$ 986 | R$ 577 |  | R$ 509 |  |
Minimum dividends required by the by-laws for the preferred shares |  |  |  | R$ 0.50 |  |  |  |  |
Mandatory dividends (including withholding income tax on Interest on Equity) |  |  |  | 0.99 |  |  |  |  |
Dividends proposed: Preferred (PN) shares |  |  |  | R$ 0.99 |  |  |  |  |
Preferred Shares [member] | Restated [member] |  |  |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |  |  |
Minimum dividends required by the by-laws for the preferred shares |  |  |  |  | R$ 0.50 |  | R$ 0.50 |  |
Dividends proposed: Common (ON) shares |  |  |  |  | 0.52 |  | 0.59 |  |
Dividends proposed: Preferred (PN) shares |  |  |  |  | R$ 0.52 |  | R$ 0.59 |  |
Common Shares [member] |  |  |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |  |  |
Total dividends for the common shares |  |  |  | R$ 496 | R$ 255 |  | R$ 290 |  |
Dividends proposed: Common (ON) shares |  |  |  | R$ 0.99 |  |  |  |  |
Common Shares [member] | Restated [member] |  |  |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |  |  |
Dividends proposed: Common (ON) shares |  |  |  |  | R$ 0.52 |  | R$ 0.59 |  |
Dividends proposed: Preferred (PN) shares |  |  |  |  | R$ 0.52 |  | R$ 0.59 |  |
Dividend Distribution [member] |  |  |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |  |  |
Net income for the year |  |  |  | R$ 2,864 | R$ 3,127 |  | R$ 1,700 |  |
Mandatory dividends - 50% of Net income |  |  |  | 1,432 |  |  |  |  |
Dividend Distribution [member] | Preferred Shares [member] |  |  |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |  |  |
Nominal value of the preferred shares |  |  |  | 5,055 | 4,856 |  | 4,856 |  |
Preferred shares |  |  |  | R$ 5,055 | R$ 4,856 |  | R$ 4,856 |  |
Percentage applied to the nominal value of the preferred shares |  |  |  | 1000.00% | 10.00% |  | 10.00% |  |
Amount of the dividends by the first payment criterion |  |  |  | R$ 506 | R$ 486 |  | R$ 486 |  |
Preferred shares as a percentage of Equity (net of shares held in Treasury) |  |  |  | 6656.00% | 66.56% |  | 66.56% |  |
Percentage applied to the portion of Equity represented by the preferred shares |  |  |  | 300.00% | 3.00% |  | 3.00% |  |
Amount of the dividends by the second payment criterion |  |  |  | R$ 349 | R$ 371 |  | R$ 291 |  |
Minimum Dividends required by the Bylaws for the preferred shares |  |  |  | R$ 506 | 486 |  | 486 |  |
Mandatory dividends - 50% of Net income |  |  |  |  | R$ 1,564 |  | R$ 850 |  |
[1] | For further details of restatement of comparative balances, see Note 2.8
[2] | See note 2.8.
[3] | The wholly-owned subsidiary Cemig D was over contracted in 2017 and 2018 and the gain arising from the sale of the excess of energy in the spot market was provisionally passed through to customers by Aneel in the tariff adjustments of 2018 and 2019, including the portion in excess of the limit of 105% of the regulatory load - thus reducing the tariff that was determined. To establish whether this is a voluntary over contracting, the Company considers that the portion above the regulatory limit will be recovered in the subsequent tariff adjustment. On August 27, 2020, Aneel published the Dispatch 2,508/2020-SRM-SGT, which set new amounts for distributors' over contracting for the years 2016 and 2017, based on a new valuation criterion established by Aneel Technical Note 97/2020-SRM-SGT - not contained in the regulatory rules which were currently in force. As a result, Cemig D filed an appeal with the Council of Aneel, for the amounts of distribution agents' over contracting to be reset in accordance with the calculation criteria based on maximum effort contained in Aneel Normative Resolution 453/2011. The Company's position on this case is reinforced by the fact that the Brazilian Energy Distributors' Association (Abradee) filed a similar appeal, supported by the opinion of contracted legal advisersadvisors. The Company has no expectation of loss in relation to realization of these amounts. The Company recognizes this receivable asset, in the amount of R$222 on December 31, 2020, as Other financial components' to be ratified. At the reporting date for this financial statements, this matter was still pending analysis by Aneel.

X
- Definition Disclosure of dividends. + References No definition available. + Details
Name: | cig_DisclosureOfDividendsLineItems
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Dividends paid first installment. + References No definition available. + Details
Name: | cig_DividendsPaidFirstInstallment
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Dividends paid second installment. + References No definition available. + Details
Name: | cig_DividendsPaidSecondInstallment
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Interest on equity specified in the by-laws. + References No definition available. + Details
Name: | cig_InterestOnEquitySpecifiedInTheBylaws
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Mandatory dividend payout as percentage of net profit. + References No definition available. + Details
Name: | cig_MandatoryDividendPayoutAsPercentageOfNetProfit
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Minimum annual dividend percentage on par value. + References No definition available. + Details
Name: | cig_MinimumAnnualDividendPercentageOnParValue
Namespace Prefix: | cig_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum annual dividend percentage on portion of equity. + References No definition available. + Details
Name: | cig_MinimumAnnualDividendPercentageOnPortionOfEquity
Namespace Prefix: | cig_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum dividend per share under by laws. + References No definition available. + Details
Name: | cig_MinimumDividendPerShareUnderByLaws
Namespace Prefix: | cig_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum dividend per share under by laws including income tax on interest on equity. + References No definition available. + Details
Name: | cig_MinimumDividendPerShareUnderByLawsIncludingIncomeTaxOnInterestOnEquity
Namespace Prefix: | cig_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum dividend under by laws. + References No definition available. + Details
Name: | cig_MinimumDividendUnderByLaws
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Minimum dividend under by laws including income tax on interest on equity. + References No definition available. + Details
Name: | cig_MinimumDividendUnderByLawsIncludingIncomeTaxOnInterestOnEquity
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Nominal value preference shares held. + References No definition available. + Details
Name: | cig_NominalValuePreferenceSharesHeld
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of preferred shares in share capital. + References No definition available. + Details
Name: | cig_PercentageOfPreferredSharesInShareCapital
Namespace Prefix: | cig_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Preferred shares. + References No definition available. + Details
Name: | cig_PreferredShares
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Proposed dividends per share. + References No definition available. + Details
Name: | cig_ProposedDividendsPerShare
Namespace Prefix: | cig_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proposed dividends per share. + References No definition available. + Details
Name: | cig_ProposedPreferredPnShares
Namespace Prefix: | cig_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of reversal of unrealized profit reserve created in 2019. + References No definition available. + Details
Name: | cig_ReversalOfUnrealizedProfitReserveCreatedIn2019
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount refers to unrealized profit reserve. + References No definition available. + Details
Name: | cig_UnrealizedProfitReserve
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Withholding income tax of interest on equity. + References No definition available. + Details
Name: | cig_WithholdingIncomeTaxOfInterestOnEquity
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of dividends that the company has declared but not yet paid. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_DividendPayables
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of dividends paid by the entity on ordinary shares. [Refer: Ordinary shares [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2020-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=34&code=ifrs-tx-2020-en-r&anchor=para_16A_f&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_DividendsPaidOrdinaryShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of residual interest in the assets of the entity after deducting all its liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2020-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2020-en-r&anchor=para_24_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2020-01-01 -Paragraph 32 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2020-en-r&anchor=para_32_a_i&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_a&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_b&doctype=Standard -URIDate 2020-01-01 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e&doctype=Standard -URIDate 2020-01-01 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_e&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_Equity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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 2020-01-01 -Paragraph 81B -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_81B_a_ii&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ProfitLossAttributableToOwnersOfParent
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis=cig_Restated1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_PreferenceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=cig_PreferredSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=cig_CommonSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=cig_DividendDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |