XML 228 R192.htm IDEA: XBRL DOCUMENT
v3.22.1

Schedule of exposure to exchange rates (Details) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Cash equivalents – Cash investments (Note 6) – CDI | R$ 708 | R$ 1,587
Marketable securities (Note 7) | 2,078 | 4,125
Restricted cash – CDI | 19 | 64
CVA and in tariffs (Note 14) – SELIC | 2,148 | 133
Assets | 4,953 | 5,909
Liabilities |  |
Loans, financing and debentures (Note 22) – CDI | (1,458) | (2,310)
Loans, financing and debentures (Note 22) – TJLP | (21) | (73)
Sector financial liabilities (note 14) | (51) | (231)
Total liabilities | (1,530) | (2,614)
Net assets exposed | 3,423 | 3,295
Cash equivalents (Note 6) | 708 |
Restricted cash | 19 |
CVA and Other financial components – SELIC (Note 14) | 2,148 | R$ 4,058
Assets | 4,953 |
Loans and financing (Note 22) – CDI | (1,458) |
Loans and financing (Note 22) – TJLP | (21) |
Sector financial liabilities (Note 14) | (51) |
Liabilities | (1,530) |
Net assets (liabilities) exposed | 3,423 |
Probable Ccenario [Member] | T J L P [Member] |  |
Assets |  |
Marketable securities (Note 7) | 2,348 |
Liabilities |  |
Cash equivalents (Note 6) | 800 |
Restricted cash | 21 |
CVA and Other financial components – SELIC (Note 14) | 2,427 |
Assets | 5,596 |
Loans and financing (Note 22) – CDI | (1,648) |
Loans and financing (Note 22) – TJLP | (22) |
Sector financial liabilities (Note 14) | (55) |
Liabilities | (1,725) |
Net assets (liabilities) exposed | 3,871 |
Net effect of fluctuation in interest rates | 448 |
Probable Ccenario [Member] | T J L P One [Member] |  |
Assets |  |
Marketable securities (Note 7) | 2,281 |
Liabilities |  |
Cash equivalents (Note 6) | 777 |
Restricted cash | 21 |
CVA and Other financial components – SELIC (Note 14) | 2,357 |
Assets | 5,436 |
Loans and financing (Note 22) – CDI | (1,600) |
Loans and financing (Note 22) – TJLP | (22) |
Sector financial liabilities (Note 14) | (54) |
Liabilities | (1,676) |
Net assets (liabilities) exposed | 3,760 |
Net effect of fluctuation in interest rates | 337 |
Probable Ccenario [Member] | T J L P Three [Member] |  |
Assets |  |
Marketable securities (Note 7) | 2,213 |
Liabilities |  |
Cash equivalents (Note 6) | 754 |
Restricted cash | 20 |
CVA and Other financial components – SELIC (Note 14) | 2,288 |
Assets | 5,275 |
Loans and financing (Note 22) – CDI | (1,553) |
Loans and financing (Note 22) – TJLP | (22) |
Sector financial liabilities (Note 14) | (53) |
Liabilities | (1,628) |
Net assets (liabilities) exposed | 3,647 |
Net effect of fluctuation in interest rates | R$ 224 |

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

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

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

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

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

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

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

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

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

X
- Definition Represent information about the loans financing and debentures tjlp. + References No definition available. + Details
Name: | cig_LoansFinancingAndDebenturesTjlp
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

X
- Definition Net effect of change in interest rate. + References No definition available. + Details
Name: | cig_NetEffectOfChangeInInterestRate
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition THe amount of sector financial liabilities. + References No definition available. + Details
Name: | cig_SectorsFinancialLiabilities
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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

X
- Definition The amount of short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_CashEquivalents
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35H&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35I&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35M&doctype=Standard -URIDate 2021-03-24 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35N&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_FinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_RestrictedCashAndCashEquivalents
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=cig_ProbableCcenarioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInterestRatesAxis=cig_TJLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInterestRatesAxis=cig_TJLPOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInterestRatesAxis=cig_TJLPThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |