XML 200 R164.htm IDEA: XBRL DOCUMENT
v3.22.1

Reserve for mandatory dividends not distributed (Details) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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IfrsStatementLineItems [Line Items] |  |  |
Dividends withheld, arising from the net income | R$ 1,420 | R$ 1,420 | R$ 1,420
Dividends Withheld Arising From The Profit For 2015 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Dividends withheld, arising from the net income | 623 |  |
Dividends Withheld Arising From The Profit For 2014 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Dividends withheld, arising from the net income | R$ 797 |  |

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Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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Data Type: | na
Balance Type: |
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