XML 77 R56.htm IDEA: XBRL DOCUMENT
v3.21.1

15. CONCESSION CONTRACT ASSETS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [abstract] |
Schedule of detailed information about concession contract assets | Under IFRS 15 – Revenue from contracts with customers, the infrastructure construction revenue for which the right to consideration depends on satisfaction of performance obligations related to the completion of its construction, or its future operation and maintenance are classified as contract assets as follows:
|  | 2020 |  | 2019 (Restated) |  | 01/01/2019 (Restated)
Distribution – Infrastructure assets under construction |  |  | 1,142 |  |  |  | 740 |  |  |  | 518 |
Gas – Infrastructure assets under construction |  |  | 94 |  |  |  | 68 |  |  |  | 81 |
Transmission – Assets reincorporated into the assets remuneration base |  |  | 1,896 |  |  |  | 1,928 |  |  |  | 2,272 |
Transmission – Assets remunerated by tariff |  |  | 1,848 |  |  |  | 1,147 |  |  |  | 637 |
|  |  | 4,980 |  |  |  | 3,883 |  |  |  | 3,509 |
Current |  |  | 737 |  |  |  | 576 |  |  |  | 482 |
Non-current |  |  | 4,243 |  |  |  | 3,307 |  |  |  | 3,026 |
Schedule of changes in concession contract assets | Changes in concession contract assets are as follows:
|  | Transmission |  | Distribution |  | Gas |  | Total
Balances at January 1, 2018 |  | - |  | - |  | - |  | -
Effects of adoption of IFRS 15 (Restated) |  |  | 2,927 |  |  |  | 532 |  |  |  | 90 |  |  |  | 3,549 |
Additions |  |  | 138 |  |  |  | 727 |  |  |  | 70 |  |  |  | 935 |
Inflation adjustment |  |  | 311 |  |  |  | — |  |  |  | — |  |  |  | 311 |
Amounts received |  |  | (467 | ) |  |  | — |  |  |  | — |  |  |  | (467 | )
Transfers to financial assets |  |  | — |  |  |  | (27 | ) |  |  | — |  |  |  | (27 | )
Transfers to intangible assets |  |  | — |  |  |  | (672 | ) |  |  | (78 | ) |  |  | (750 | )
Impairment |  |  | — |  |  |  | (42 | ) |  |  | — |  |  |  | (42 | )
Balances at January 1, 2019 (Restated) |  |  | 2,909 |  |  |  | 518 |  |  |  | 82 |  |  |  | 3,509 |
Additions |  |  | 312 |  |  |  | 903 |  |  |  | 43 |  |  |  | 1,258 |
Inflation adjustment |  |  | 328 |  |  |  | — |  |  |  | — |  |  |  | 328 |
Amounts received |  |  | (473 | ) |  |  | — |  |  |  | — |  |  |  | (473 | )
Disposals |  |  | — |  |  |  | — |  |  |  | (2 | ) |  |  | (2 | )
Transfers to financial assets |  |  | — |  |  |  | (48 | ) |  |  | — |  |  |  | (48 | )
Transfers to intangible assets |  |  | — |  |  |  | (630 | ) |  |  | (55 | ) |  |  | (685 | )
Impairment |  |  | — |  |  |  | (3 | ) |  |  | — |  |  |  | (3 | )
Balances at December 31, 2019 (Restated) |  |  | 3,076 |  |  |  | 740 |  |  |  | 68 |  |  |  | 3,884 |
Additions |  |  | 201 |  |  |  | 1,346 |  |  |  | 50 |  |  |  | 1,597 |
Inflation adjustment |  |  | 438 |  |  |  | — |  |  |  | — |  |  |  | 438 |
Results of the Periodic Tariff Review |  |  | 552 |  |  |  | — |  |  |  | — |  |  |  | 552 |
Amounts received |  |  | (623 | ) |  |  | — |  |  |  | — |  |  |  | (623 | )
Disposals |  |  | (7 | ) |  |  | — |  |  |  | (2 | ) |  |  | (9 | )
Transfers to financial assets |  |  | — |  |  |  | (60 | ) |  |  | — |  |  |  | (60 | )
Transfers to intangible assets |  |  | — |  |  |  | (883 | ) |  |  | (23 | ) |  |  | (906 | )
Contract assets arising from business combination (Note 16d) |  |  | 108 |  |  |  | — |  |  |  | — |  |  |  | 108 |
Impairment |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | )
Balances at December 31, 2020 |  |  | 3.745 |  |  |  | 1,142 |  |  |  | 93 |  |  |  | 4,980 |
Schedule of concession contracts |
|  | 2020 |  | 2019 (Restated) |  | 01/01/2019 (Restated)
Current |  |  |  |  |  |  |  |  |  |  |  |
Concession contract - 004/05 |  |  | 19 |  |  |  | — |  |  |  | — |
Concession contract - 079/00 |  |  | 29 |  |  |  | 21 |  |  |  | 19 |
Concession contract - 006/97 |  |  |  |  |  |  |  |  |  |  |  |
Basic Network of the Existing System (BNES) |  |  | 533 |  |  |  | 434 |  |  |  | 347 |
Basic Network of New Facilities (BNNF) |  |  | 156 |  |  |  | 121 |  |  |  | 116 |
|  |  | 737 |  |  |  | 576 |  |  |  | 482 |
Non-current |  |  |  |  |  |  |  |  |  |  |  |
Concession contract - 004/05 |  |  | 91 |  |  |  | — |  |  |  | — |
Concession contract - 079/00 |  |  | 133 |  |  |  | 95 |  |  |  | 93 |
Concession contract - 006/97 |  |  |  |  |  |  |  |  |  |  |  |
Basic Network of the Existing System (BNES) |  |  | 1,363 |  |  |  | 1,494 |  |  |  | 1,714 |
Basic Network of New Facilities (BNNF) |  |  | 1,421 |  |  |  | 911 |  |  |  | 620 |
|  |  | 3,008 |  |  |  | 2,500 |  |  |  | 2,427 |
|  |  | 3,745 |  |  |  | 3,076 |  |  |  | 2,909 |
a) | Concession contract n. 006/97

X
- Definition Disclosure of detailed information about contract assets. + References No definition available. + Details
Name: | cig_DisclosureOfDetailedInformationAboutContractAssetsExplantory
Namespace Prefix: | cig_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of movement in contract assets. + References No definition available. + Details
Name: | cig_DisclosureOfMovementInContractAssetsExplanatory
Namespace Prefix: | cig_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The entire disclosure for service concession arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name SIC -Number 29 -IssueDate 2020-01-01 -Section Consensus -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=SIC&num=29&code=ifrs-tx-2020-en-r&doctype=Standard&dita_xref=SIC29_g6-7_TI -URIDate 2020-01-01 + Details
Name: | ifrs-full_DisclosureOfServiceConcessionArrangementsExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration