XML 74 R127.htm IDEA: XBRL DOCUMENT
v3.20.1

18. INVESTMENTS (Details 3) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about investment property [abstract] |  |
Opening balances | R$ 120 | R$ 77
Dividends proposed by investees | 285 | 354
Dividends proposed by investee classified as held for sale | 73 |
Withholding income tax on Interest on equity | (8) | (7)
Amounts received | (283) | (304)
Ending balances | R$ 186 | R$ 120

X
- Definition Dividend receivable. + References No definition available. + Details
Name: | cig_DividendReceivable
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investees dividends proposal. + References No definition available. + Details
Name: | cig_InvesteesDividendsProposal
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of investees' dividends proposed held for sale. + References No definition available. + Details
Name: | cig_InvesteesDividendsProposedHeldForSale
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of withholding income tax on Interest on equity. + References No definition available. + Details
Name: | cig_WithholdingIncomeTaxOnInterestOnEquity
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition The amount of dividends received. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B12 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B12_a&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
Name: | ifrs-full_DividendsReceived
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration