XML 181 R160.htm IDEA: XBRL DOCUMENT
v3.21.1

22. LOANS, FINANCING AND DEBENTURES (Detaills 5) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Beginning Balance |  | R$ 14,777 |  |  |
(-) Transaction costs |  | 57 |  |  |
(-) Discount in the issues of securities |  | (18) |  |  |
(-) Interest paid in advance |  | (25) |  |  |
Ending Balance |  | 2,310 |  | R$ 14,777 |
Loans, financing and debentures [member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Beginning Balance |  | 14,777 |  | 14,772 | R$ 14,398
Liabilities arising from business combination |  | 10 | [1] |  | 163
Initial balance for consolidation purposes |  | 14,787 |  |  | 14,561
Loans and financings obtained |  | 850 |  | 4,510 | 2,996
(-) Transaction costs |  | (24) |  | (10) | (16)
(-) Discount in the issues of securities |  |  |  | (23) |
(-) Interest paid in advance |  |  |  |  | 10
Financings obtained, net |  |  |  | 4,477 | 2,990
Monetary variation |  | 187 |  | 142 | 134
Exchange rate variation |  | 1,742 |  | 226 | 582
Financial charges provisioned |  | 1,211 | [2] | 1,250 | 1,287
Amortization of transaction cost |  | 15 |  | 38 | 33
Financial charges paid |  | (1,212) |  | (1,265) | (1,290)
Amortization of financings |  | (2,531) |  | (4,883) | (3,527)
Reclassification to "Other obligations" | [3] | (8) |  |  |
Subtotal |  | 15,017 |  | 14,757 | 14,770
FIC Pampulha: Marketable securities of subsidiary companies |  | 3 |  | 20 | 2
Ending Balance |  | R$ 15,020 |  | R$ 14,777 | R$ 14,772
[1] | Loans arising from business combinations due to the acquisition of the remaining equity interest in Companhia Centroeste de Minas, settled in full in August 2020.
[2] | Withholding income tax on remittance of interest on Eurobonds, in the amount of R$130, was offset against PIS/Pasep and Cofins credits.
[3] | Reclassification to Cemig D's customers (CMM and Serra da Fortaleza).

X
- Definition Amortization of financing costs. + References No definition available. + Details
Name: | cig_AmortizationOfFinancingCosts1
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of amortization transaction cost. + References No definition available. + Details
Name: | cig_AmortizationOfTransactionsCost
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of liabilites arising from business combination. + References No definition available. + Details
Name: | cig_ContingentLiabilitiesRecogniseInBusinessCombination
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of discount on the issuance of debentures. + References No definition available. + Details
Name: | cig_DiscountOnIssuanceOfDebentures
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Exchange rate variation on borrowings. + References No definition available. + Details
Name: | cig_ExchangeRateVariationOnBorrowings
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financial charges paid. + References No definition available. + Details
Name: | cig_FinancialChargesPaid
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financial charges provisioned. + References No definition available. + Details
Name: | cig_FinancialChargesProvisioned
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financial investments in securities issued by subsidiary. + References No definition available. + Details
Name: | cig_FinancialInvestmentInSecuritiesIssuedBySubsidiary
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financings obtained gross + References No definition available. + Details
Name: | cig_FinancingsObtainedGross
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of initial balance for consolidation purposes. + References No definition available. + Details
Name: | cig_InitialBalanceOfBorrowingForConsolidationPurposes
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loans and Capital Lease financing + References No definition available. + Details
Name: | cig_LoansAndCapitalLeaseFinancing
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loans and financings obtained. + References No definition available. + Details
Name: | cig_LoansAndFinancingObtained
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Monetary variation on borrowings. + References No definition available. + Details
Name: | cig_MonetaryVariationOnBorrowings
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of reclassification to other obligations. + References No definition available. + Details
Name: | cig_ReclassificationToOtherObligations
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds that are recognised as an expense. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_BorrowingCostsRecognisedAsExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_Borrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of interest income on loans and advances to banks. [Refer: Interest income; Loans and advances to banks] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_InterestIncomeOnLoansAndAdvancesToBanks
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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