XML 174 R153.htm IDEA: XBRL DOCUMENT
v3.21.1

21. TAXES PAYABLE AND AMOUNTS TO BE REFUNDED TO CUSTOMERS (Details) - BRL (R$) R$ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 02, 2019 | [1] | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
Disclosure of taxes payable [line items] |  |  |  |  |  |
Current taxes payable |  | R$ 506 |  |  |  |
Non current Taxes payable |  | 263 |  |  |  |
Total tax payable |  | 769 |  |  |  |
Pasep and Cofins taxes to be reimbursed to customers |  | 4,018 |  |  |  |
Restated [member] |  |  |  |  |  |
Disclosure of taxes payable [line items] |  |  |  |  |  |
Current taxes payable |  |  | R$ 411 | [1] | R$ 453 | R$ 453
Non current Taxes payable |  |  | 227 | [1] | R$ 249 | 249
Total tax payable |  |  | 638 |  |  |
Pasep and Cofins taxes to be reimbursed to customers |  |  | 4,193 |  |  |
ICMS [member] |  |  |  |  |  |
Disclosure of taxes payable [line items] |  |  |  |  |  |
Current taxes payable |  | 112 |  |  |  |
ICMS [member] | Restated [member] |  |  |  |  |  |
Disclosure of taxes payable [line items] |  |  |  |  |  |
Current taxes payable |  |  | 112 |  |  | 168
COFINS [member] |  |  |  |  |  |
Disclosure of taxes payable [line items] |  |  |  |  |  |
Current taxes payable | [2] | 184 |  |  |  |
Non current Taxes payable | [3] | 216 |  |  |  |
COFINS [member] | Restated [member] |  |  |  |  |  |
Disclosure of taxes payable [line items] |  |  |  |  |  |
Current taxes payable | [2] |  | 177 |  |  | 182
Non current Taxes payable | [3] |  | 186 |  |  | 206
PIS/PASEP [member] |  |  |  |  |  |
Disclosure of taxes payable [line items] |  |  |  |  |  |
Current taxes payable | [2] | 41 |  |  |  |
Non current Taxes payable | [3] | 47 |  |  |  |
PIS/PASEP [member] | Restated [member] |  |  |  |  |  |
Disclosure of taxes payable [line items] |  |  |  |  |  |
Current taxes payable | [2] |  | 39 |  |  | 39
Non current Taxes payable | [3] |  | 40 |  |  | 43
INSS [member] |  |  |  |  |  |
Disclosure of taxes payable [line items] |  |  |  |  |  |
Current taxes payable |  | 29 |  |  |  |
INSS [member] | Restated [member] |  |  |  |  |  |
Disclosure of taxes payable [line items] |  |  |  |  |  |
Current taxes payable |  |  | 25 |  |  | 23
Others [member] |  |  |  |  |  |
Disclosure of taxes payable [line items] |  |  |  |  |  |
Current taxes payable | [4] | 140 |  |  |  |
Others [member] | Restated [member] |  |  |  |  |  |
Disclosure of taxes payable [line items] |  |  |  |  |  |
Current taxes payable | [4] |  | 58 |  |  | R$ 41
PIS/PASEP and COFINS [member] |  |  |  |  |  |
Disclosure of taxes payable [line items] |  |  |  |  |  |
Current taxes payable |  | 448 |  |  |  |
Non current Taxes payable |  | R$ 3,570 |  |  |  |
PIS/PASEP and COFINS [member] | Restated [member] |  |  |  |  |  |
Disclosure of taxes payable [line items] |  |  |  |  |  |
Current taxes payable |  |  |  |  |  |
Non current Taxes payable |  |  | R$ 4,193 |  |  |
[1] | For further details of restatement of comparative balances, see Note 2.8
[2] | Includes Cofins and PIS/Pasep recognized in current liability includes the deferred taxes related to the interest revenue arising from the financing component in contract asset and to the revenue of construction and upgrade associated with the transmission concession contract, whose consideration will be received in at least twelve months after the reporting period. For more information, see note 2.8 and 15.
[3] | The deferral of PIS/Pasep and Cofins taxes related to the interest revenue arising from the financing component in contract asset and to the revenue of construction and upgrade associated with the transmission concession contract, whose consideration will be received in at least twelve months after the reporting period. For more information, see note 2.8 and 15.
[4] | This includes the withholding income tax on Interest on equity paid in January 2020, in accordance with the tax legislation.

X
- Definition Disclosure of taxes payable [line items]. + References No definition available. + Details
Name: | cig_DisclosureOfTaxesPayableLineItems
Namespace Prefix: | cig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Pasep and Cofins taxes to be reimbursed to customers. + References No definition available. + Details
Name: | cig_PasepAndCofinsTaxesToBeReimbursedToCustomers
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The current amount of current tax liabilities. [Refer: Current tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph n -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_n&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_CurrentTaxLiabilitiesCurrent
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The non-current amount of current tax liabilities. [Refer: Current tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph n -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_n&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_CurrentTaxLiabilitiesNoncurrent
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of deferred tax liabilities net of deferred tax assets, when the absolute amount of deferred tax liabilities is greater than the absolute amount of deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_NetDeferredTaxLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | ifrs-full_ClassesOfLiabilitiesAxis=cig_ICMSRelatedMattersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfLiabilitiesAxis=cig_COFINSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfLiabilitiesAxis=cig_PasepMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfLiabilitiesAxis=cig_INSSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfLiabilitiesAxis=cig_OtherTaxAuthorityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfLiabilitiesAxis=cig_PasepAndCofinsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |