XML 208 R187.htm IDEA: XBRL DOCUMENT
v3.25.1

Revenue - Schedule of Transmission Concession Contract (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenue |  |  |  |
Construction and upgrades Revenue | R$ 425 | [1] | R$ 242 | R$ 407
Construction and upgrades costs | (290) |  | (172) | (291)
Margin | R$ 135 |  | R$ 70 | R$ 116
Mark-up (%) | 46.55% |  | 40.70% | 39.86%
Operation and maintenance Revenue | R$ 383 |  | R$ 373 | R$ 413
Operation and maintenance cost | (298) |  | (292) | (287)
Margin | R$ 85 |  | R$ 81 | R$ 126
Mark-up (%) | 28.52% |  | 27.74% | 43.90%
[1] | This breakdown does not include the financial “Interest revenue arising from the financing component in the transmission contract asset” – which is also part of the concession’s transmission revenue.

X
- Definition The amount of construction and upgrades costs. + References No definition available. + Details
Name: | cig_ConstructionAndUpgradesCosts
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of construction and upgrades revenue. + References No definition available. + Details
Name: | cig_ConstructionAndUpgradesRevenue
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of margin construction revenue. + References No definition available. + Details
Name: | cig_MarginConstructionRevenue
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of margin operation revenue. + References No definition available. + Details
Name: | cig_MarginOperationRevenue
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of markup construction revenue. + References No definition available. + Details
Name: | cig_MarkupConstructionRevenue
Namespace Prefix: | cig_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of markup operation revenue. + References No definition available. + Details
Name: | cig_MarkupOperationRevenue
Namespace Prefix: | cig_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of operation and maintenance cost. + References No definition available. + Details
Name: | cig_OperationAndMaintenanceCost
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of operation and maintenance revenue. + References No definition available. + Details
Name: | cig_OperationAndMaintenanceRevenue
Namespace Prefix: | cig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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