XML 162 R126.htm IDEA: XBRL DOCUMENT
v3.22.1

Schedule of changes in intangible assets (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
IfrsStatementLineItems [Line Items] |  |  |
Intangible assets | R$ 11,810 | R$ 11,624 | R$ 10,777
Intangible assets | 1,032 | 41 | 934
Disposals and retirements, intangible assets other than goodwill | (23) | (24) | (41)
Amortisation, intangible assets other than goodwill | (829) | (744) | (704)
Increase (decrease) through transfers and other changes, intangible assets other than goodwill | 915 | 913 | 658
Intangible assets | 12,953 | 11,810 | 11,624
Temporary Easements Intangible Assets [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Intangible assets | 9 | 8 | 9
Intangible assets |  |  |
Disposals and retirements, intangible assets other than goodwill | 0 |  |
Amortisation, intangible assets other than goodwill | (1) | (1) |
Increase (decrease) through transfers and other changes, intangible assets other than goodwill | 2 | 1 |
Intangible assets | 10 | 9 | 8
Onerous Concession Intangible Assets [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Intangible assets | 6 | 7 | 7
Intangible assets | 0 |  |
Disposals and retirements, intangible assets other than goodwill | 0 |  |
Amortisation, intangible assets other than goodwill | (1) | (1) |
Increase (decrease) through transfers and other changes, intangible assets other than goodwill | 0 |  |
Intangible assets | 5 | 6 | 7
Assets Of Concession Intangible Assets [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Intangible assets | 11,674 | 11,517 | 10,680
Intangible assets | 0 |  | 891
Disposals and retirements, intangible assets other than goodwill | (23) | (24) | (41)
Amortisation, intangible assets other than goodwill | (757) | (738) | (698)
Increase (decrease) through transfers and other changes, intangible assets other than goodwill | 913 | 919 | 685
Intangible assets | 11,807 | 11,674 | 11,517
Assets Of Concession G S F Intangible Assets [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Intangible assets |  |  |
Intangible assets | 1,032 |  |
Disposals and retirements, intangible assets other than goodwill | 0 |  |
Amortisation, intangible assets other than goodwill | (66) |  |
Increase (decrease) through transfers and other changes, intangible assets other than goodwill | 0 |  |
Intangible assets | 966 |  |
Others Intangible Assets [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Intangible assets | 8 | 10 | 18
Intangible assets | 0 |  | 7
Disposals and retirements, intangible assets other than goodwill | 0 |  |
Amortisation, intangible assets other than goodwill | (4) | (5) | (5)
Increase (decrease) through transfers and other changes, intangible assets other than goodwill | 0 | 3 | (10)
Intangible assets | 4 | 8 | 10
In Progress [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Intangible assets | 113 |  |
Intangible assets | 51 |  |
Disposals and retirements, intangible assets other than goodwill | 0 |  |
Amortisation, intangible assets other than goodwill |  |  |
Increase (decrease) through transfers and other changes, intangible assets other than goodwill | (3) |  |
Intangible assets | 161 | 113 |
Net Intangible Assets [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Intangible assets | 11,810 |  |
Intangible assets | 1,083 |  |
Disposals and retirements, intangible assets other than goodwill | (23) |  |
Amortisation, intangible assets other than goodwill | (829) |  |
Increase (decrease) through transfers and other changes, intangible assets other than goodwill | 912 |  |
Intangible assets | 12,953 | 11,810 |
Useful Life Defined Intangible Asset [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Intangible assets | 11,697 | 11,542 | 10,714
Intangible assets |  |  | 898
Disposals and retirements, intangible assets other than goodwill |  | (24) | (41)
Amortisation, intangible assets other than goodwill |  | (744) | (704)
Increase (decrease) through transfers and other changes, intangible assets other than goodwill |  | 923 | 675
Intangible assets | 12,792 | 11,697 | 11,542
Intangible assets under development [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Intangible assets | 113 | 82 | 63
Intangible assets |  | 41 | 36
Increase (decrease) through transfers and other changes, intangible assets other than goodwill |  | (10) | (17)
Intangible assets | R$ 161 | R$ 113 | R$ 82

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

X
- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2021-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2021-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e_vi&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The decrease in intangible assets other than goodwill resulting from disposals and retirements. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2021-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DisposalsAndRetirementsIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in intangible assets other than goodwill resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2021-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2021-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_c&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_IntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=cig_TemporaryEasementsIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=cig_OnerousConcessionIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=cig_AssetsOfConcessionIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=cig_AssetsOfConcessionGSFIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=cig_OthersIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=cig_InProgressMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=cig_NetIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=cig_UsefulLifeDefinedIntangibleAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_IntangibleAssetsUnderDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |