XML 149 R113.htm IDEA: XBRL DOCUMENT
v3.22.1

Changes in these assets are as follows: (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | R$ 664 | R$ 704 | R$ 745
Amortization | (40) | (40) | (41)
Ending balance | 609 | 664 | 704
Disposals | (15) |  |
Retiro baixo [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 30 | 31 | 32
Amortization | (1) | (1) | (1)
Ending balance | 29 | 30 | 31
Madeira energia [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 16 | 17 | 18
Amortization | (1) | (1) | (1)
Ending balance |  | 16 | 17
Disposals | (15) |  |
Lightger [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 78 | 81 | 84
Amortization | (2) | (3) | (3)
Ending balance | 76 | 78 | 81
Alianca geracao [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 328 | 353 | 378
Amortization | (25) | (25) | (25)
Ending balance | 303 | 328 | 353
Alianca norte [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 49 | 51 | 53
Amortization | (2) | (2) | (2)
Ending balance | 47 | 49 | 51
Taesa [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 163 | 171 | 180
Amortization | (9) | (8) | (9)
Ending balance | R$ 154 | R$ 163 | R$ 171

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- Definition Amortization investment property. + References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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- Definition The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2021-01-01 -Paragraph 76 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2021-en-r&anchor=para_76&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2021-01-01 -Paragraph 79 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2021-en-r&anchor=para_79_d&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_b&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_MadeiraEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=cig_LightgerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |