XML 152 R116.htm IDEA: XBRL DOCUMENT
v3.22.1

Schedule of subsidiaries and jointly controlled entities percentage by the company’s ownership interest (Details) - BRL (R$) R$ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
IfrsStatementLineItems [Line Items] |  |  |  |  |
Share capital |  | R$ 8,467 | R$ 7,594 |  |
Equity |  | R$ 19,462 | R$ 17,478 | R$ 16,103 | R$ 16,084
UFV Janauba Geracao de Energia Eletrica Distribuida [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 18,509,900,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% |  |
Share capital |  | R$ 7 | R$ 19 |  |
Equity |  | R$ 5 |  | R$ 22 |
U F V Corinto Geracao De Energia Eletrica Distriiuida [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 18,000,000,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% |  |
Share capital |  | R$ 18 | R$ 18 |  |
Equity |  | R$ 19 | R$ 20 |  |
U F V Manga Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 21,660,575,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% |  |
Share capital |  | R$ 21 | R$ 21 |  |
Equity |  | R$ 22 | R$ 24 |  |
U F V Bonfinopolis I I Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 13,197,187,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% |  |
Share capital |  | R$ 13 | R$ 13 |  |
Equity |  | R$ 13 | R$ 13 |  |
U F V Lagoa Grande Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 25,471,844,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% |  |
Share capital |  | R$ 25 | R$ 25 |  |
Equity |  | R$ 26 | R$ 26 |  |
U F V Lontra Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 29,010,219,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% |  |
Share capital |  | R$ 29 | R$ 29 |  |
Equity |  | R$ 29 | R$ 29 |  |
U F V Mato Verde Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 11,030,391,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% |  |
Share capital |  | R$ 11 | R$ 11 |  |
Equity |  | R$ 11 | R$ 12 |  |
U F V Mirabela Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 9,320,875,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% |  |
Share capital |  | R$ 9 | R$ 9 |  |
Equity |  | R$ 9 | R$ 9 |  |
U F V Porteirinha I Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 12,348,392,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% |  |
Share capital |  | R$ 12 | R$ 12 |  |
Equity |  | R$ 13 | R$ 13 |  |
U F V Porteirinha I I Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 11,702,733,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% |  |
Share capital |  | R$ 12 | R$ 12 |  |
Equity |  | R$ 12 | R$ 12 |  |
U F V Brasilandia Geracao De Energia Eletrica Distribuida [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 25,629,900,000,000 |  |  |
Cemig interest % |  | 49.00% |  |  |
Share capital |  | R$ 26 |  |  |
Equity |  | R$ 27 |  |  |
Cemig Geracao E Transmissao [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares | [1] | 2,896,785,358,000,000 |  |  |
Cemig interest % | [1] | 10000.00% | 100.00% | 100.00% |
Share capital | [1] | R$ 4,124 | R$ 4,000 | R$ 2,600 |
Equity | [1] | R$ 7,755 | R$ 5,842 | R$ 5,348 |
Madeira Energia 1 [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares | [2] | 12,034,025,147,000,000 |  |  |
Cemig interest % | [2] | 15.51% | 15.51% | 15.51% |
Share capital | [2] | R$ 10,620 | R$ 10,620 | R$ 10,620 |
Equity | [2] | R$ 1,492 | R$ 2,259 | R$ 3,705 |
Hidreletrica cachoeirao [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 35,000,000,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00% |
Share capital |  | R$ 35 | R$ 35 | R$ 35 |
Equity |  | R$ 120 | R$ 110 | R$ 110 |
Guanhaes Energia [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares | [3] | 548,626,000,000,000 |  |  |
Cemig interest % | [3] | 49.00% | 49.00% | 49.00% |
Share capital | [3] | R$ 549 | R$ 549 | R$ 549 |
Equity | [3] | R$ 255 | R$ 268 | R$ 268 |
Hidreletrica Pipoca [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 41,360,000,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00% |
Share capital |  | R$ 41 | R$ 41 | R$ 41 |
Equity |  | R$ 95 | R$ 73 | R$ 63 |
Baguari Energia [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares | [4] | 26,157,300,278,000,000 |  |  |
Cemig interest % | [4] | 69.39% | 69.39% | 69.39% |
Share capital | [4] | R$ 187 | R$ 187 | R$ 187 |
Equity | [4] | R$ 243 | R$ 229 | R$ 227 |
Central Eolica Praias De Parajuru [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 85,834,843,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 86 | R$ 71 | R$ 72 |
Equity |  | R$ 128 | R$ 107 | R$ 89 |
Central Eolica Volta Do Rio [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 274,867,441,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 275 | R$ 117 | R$ 139 |
Equity |  | R$ 207 | R$ 171 | R$ 58 |
Lightger [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 79,078,937,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00% |
Share capital |  | R$ 79 | R$ 79 | R$ 79 |
Equity |  | R$ 98 | R$ 106 | R$ 95 |
Alianca norte [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 41,923,360,811,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00% |
Share capital |  | R$ 1,209 | R$ 1,209 | R$ 1,208 |
Equity |  | R$ 1,148 | R$ 1,189 | R$ 1,266 |
Amazonia Energia [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares | [4] | 1,322,597,723,000,000 |  |  |
Cemig interest % | [4] | 74.50% | 74.50% | 74.50% |
Share capital | [4] | R$ 1,323 | R$ 1,323 | R$ 1,323 |
Equity | [4] | R$ 1,252 | R$ 1,296 | R$ 1,380 |
Alianca geracao [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 1,291,582,500,000,000 |  |  |
Cemig interest % |  | 45.00% | 45.00% | 45.00% |
Share capital |  | R$ 1,291 | R$ 1,291 | R$ 1,291 |
Equity |  | R$ 1,858 | R$ 1,858 | R$ 1,858 |
Retiro baixo [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 225,350,000,000,000 |  |  |
Cemig interest % |  | 49.90% | 49.90% | 49.90% |
Share capital |  | R$ 225 | R$ 225 | R$ 225 |
Equity |  | R$ 346 | R$ 325 | R$ 300 |
Usina Hidreletrica Itaocara S A [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 156,259,500,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00% |
Share capital |  | R$ 156 | R$ 72 | R$ 69 |
Equity |  | R$ (42) | R$ (60) | R$ (45) |
Cemig Ger Tres Marias S A [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 1,291,423,369,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 1,291 | R$ 1,291 | R$ 1,291 |
Equity |  | R$ 1,652 | R$ 1,452 | R$ 1,408 |
Cemig Ger Salto Grande S A [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 405,267,607,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 405 | R$ 405 | R$ 405 |
Equity |  | R$ 527 | R$ 455 | R$ 446 |
Cemig Ger Itutinga S A [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 151,309,332,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 151 | R$ 151 | R$ 151 |
Equity |  | R$ 212 | R$ 180 | R$ 184 |
Cemig Geracao Camargos S A [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 113,499,102,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 113 | R$ 113 | R$ 113 |
Equity |  | R$ 165 | R$ 144 | R$ 136 |
Cemig Geracao Sul S A [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 148,146,505,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 148 | R$ 148 | R$ 148 |
Equity |  | R$ 215 | R$ 174 | R$ 179 |
Cemig Geracao Leste S A [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 100,568,929,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 101 | R$ 101 | R$ 101 |
Equity |  | R$ 148 | R$ 127 | R$ 127 |
Cemig Geracao Oeste S A [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 60,595,484,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 61 | R$ 61 | R$ 61 |
Equity |  | R$ 106 | R$ 84 | R$ 73 |
Rosal Energia S A [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 46,944,467,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 47 | R$ 47 | R$ 47 |
Equity |  | R$ 115 | R$ 127 | R$ 128 |
Sa Carvalho S A [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 361,200,000,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 37 | R$ 37 | R$ 37 |
Equity |  | R$ 134 | R$ 115 | R$ 124 |
Horizontes Energia S A [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 39,257,563,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 39 | R$ 39 | R$ 39 |
Equity |  | R$ 60 | R$ 55 | R$ 57 |
Cemig P C H S A [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 45,952,000,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 46 | R$ 46 | R$ 46 |
Equity |  | R$ 90 | R$ 90 | R$ 98 |
Cemig Geracao Poco Fundo S A [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares | [5] | 97,161,578,000,000 |  |  |
Cemig interest % | [5] | 100.00% | 100.00% | 100.00% |
Share capital | [5] | R$ 97 | R$ 1 | R$ 1 |
Equity | [5] | R$ 114 | R$ 4 | R$ 4 |
Empresa De Servicos De Comercializacao De Energia Eletrica S A [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 486,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  |  |  |  |
Equity |  | R$ 8 | R$ 57 | R$ 28 |
Cemig Trading S A [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 1,000,000,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 1 | R$ 1 | R$ 1 |
Equity |  | R$ 2 | R$ 30 | R$ 31 |
Cemig Distribuicao [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 2,359,113,452,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 5,372 | R$ 5,372 | R$ 5,372 |
Equity |  | R$ 6,943 | R$ 6,022 | R$ 4,708 |
Taesa [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 1,033,496,721,000,000 |  |  |
Cemig interest % |  | 21.68% | 21.68% | 21.68% |
Share capital |  | R$ 3,042 | R$ 3,042 | R$ 3,042 |
Equity |  | R$ 6,685 | R$ 6,026 | 4,927 |
Ativas data center [member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 456,540,718,000,000 |  |  |
Cemig interest % |  | 19.60% | 19.60% |  |
Share capital |  | R$ 182 | R$ 182 | 182 |
Equity |  | R$ 80 | R$ 86 | R$ 82 |
Gasmig [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 409,255,483,000,000 |  |  |
Cemig interest % |  | 99.57% | 9957.00% | 9957.00% |
Share capital |  | R$ 665 | R$ 665 | R$ 665 |
Equity |  | R$ 1,222 | R$ 1,079 | R$ 988 |
Efficientia [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 24,431,845,000,000 |  |  |
Cemig interest % |  | 100.00% | 100.00% | 100.00% |
Share capital |  | R$ 102 | R$ 24 | R$ 15 |
Equity |  | R$ 111 | R$ 94 | R$ 17 |
Companhia De Transmissao Centroeste De Minas [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 28,000,000,000,000 |  |  |
Cemig interest % |  | 100.00% | 51.00% | 51.00% |
Share capital |  | R$ 28 | R$ 28 | R$ 28 |
Equity |  |  | R$ 118 | R$ 47 |
Sete Lagoas Transmissora De Energia [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 36,857,080,000,000 |  |  |
Cemig interest % |  | 100.00% |  |  |
Share capital |  | R$ 37 |  |  |
Equity |  | R$ 65 |  |  |
Axxiom Solucoes Tecnologicas [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Number of shares |  | 68,064,706,000,000 |  |  |
Cemig interest % |  | 49.00% | 49.00% | 49.00% |
Share capital |  | R$ 68 | R$ 65 | R$ 58 |
Equity |  | R$ 9 | R$ 9 | R$ 27 |
[1] | On July 30, 2021, the Company made an advance for future capital increase in Cemig GT, of R$1,350, in order to provide the resources for the Cash Tender offer implementation. For further information about the Tender Offer, please see Note 22.
[2] | The total of Shareholders’ equity originally disclosed by the investee was adjusted by the Company for the purposes of posting equity income (change in the value of equity in non-consolidated investees), to take into account the modifying subsequent events resulting from the judgments given in the arbitration proceedings to which Saesa is a party. There is more information below in this note.
[3] | On December 9, 2021, Light disclosed to the market that it had signed a share purchase agreement with Brasal Energia S.A. for sale of its equity interest in Guanhães and LightGer, subject to the conditions precedent that are usual in this type of transaction. Brasal Energia S.A will join this investee existing shareholders’ agreements, complying fully with their terms.
[4] | Jointly-control under a Shareholders’ Agreement.
[5] | On February 23, 2021, Aneel authorized through Resolution 9,735 the Company transfer of ownership of the concession of the Poço Fundo Small Hydro Plant from Cemig Geração e Transmissão S.A. to Cemig Geração Poço Fundo S.A. The transfer was formalized by signature of a new concession contract, Nº. 01/2021, on April 16, 2021. In the third quarter, Cemig GT transferred to this investee, as an advance against future capital increase, the assets related to the Poço Fundo Small Hydro Plant, in the amount of R$77, as well as the amount of R$20, in cash. In the fourth quarter of 2021 the Company made a further injection, of R$40, into this investee, in cash.

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

X
- References No definition available. + Details
Name: | cig_NumberOfSharesHeldInSubsidiariesOrJointlyControlledEntities
Namespace Prefix: | cig_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | cig_ProportionOfOwnershipInterestInSubsidiariesAndJointlyControlledEntities
Namespace Prefix: | cig_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of residual interest in the assets of the entity after deducting all its liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2021-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2021-en-r&anchor=para_24_a&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2021-01-01 -Paragraph 32 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2021-en-r&anchor=para_32_a_i&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2021-01-01 -Paragraph 93 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_a&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2021-01-01 -Paragraph 93 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_b&doctype=Standard -URIDate 2021-03-24 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2021-01-01 -Paragraph 93 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_e&doctype=Standard -URIDate 2021-03-24 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78_e&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_Equity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The nominal value of capital issued. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78_e&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_IssuedCapital
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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

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

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

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

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

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

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

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

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

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGeracaoETransmissaoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_MadeiraEnergia1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_HidreletricaCachoeiraoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_GuanhaesEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_HidreletricaPipocaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_BaguariEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CentralEolicaPraiasDeParajuruMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CentralEolicaVoltaDoRioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_AliancaNorteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_AmazoniaEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_AliancaGeracaoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_RetiroBaixoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_UsinaHidreletricaItaocaraSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGerTresMariasSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGerSaltoGrandeSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGerItutingaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGeracaoCamargosSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGeracaoSulSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGeracaoLesteSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGeracaoOesteSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_RosalEnergiaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_SaCarvalhoSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_HorizontesEnergiaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigPCHSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigGeracaoPocoFundoSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_EmpresaDeServicosDeComercializacaoDeEnergiaEletricaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigTradingSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CemigDistribuicaoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_TaesaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_AtivasDataCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_GasmigMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_EfficientiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_CompanhiaDeTransmissaoCentroesteDeMinasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_SeteLagoasTransmissoraDeEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cig_AxxiomSolucoesTecnologicasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |