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16. CONCESSION FINANCIAL AND SECTOR ASSETS AND LIABILITIES (Details 4) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Current assets R$ 1,080 R$ 1,071    
Non-current assets 4,851 4,927    
Liabilities 18,764 (18,120)    
Current liabilities 415      
Financial assets (liabilities), net 882 1,080 R$ (46) R$ (407)
CVA Account for Compensation Of Changes In Portion A Costs [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Assets 3,430 3,729    
Current assets 2,555 2,689    
Non-current assets 875 1,040    
Liabilities (2,548) (2,649)    
Current liabilities (1,915) (2,042)    
Non-current liabilities (633) (607)    
Total current, net 640 647    
Total non-current,net 242 433    
Financial assets (liabilities), net 882 1,080    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Quota For The Energy Development Account [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net 148 221    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Tariff For Use Of Transmission Facilities Of Grid Participants [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net 96 18    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Tariff For Transport Of Electricity Provided By Itaiputs [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net 25 18    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Program To Encourage Alternative Sources Of Electricity Proinfa [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net 5 8    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | System Service Charges And Reserve Energy Charge [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net (297) (533)    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Energy Purchased For Resale [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net 1,293 2,069    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Overcontracting Of Supply [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net [1] 132 (217)    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Neutrality of Portion A [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net (42) 38    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Other Financial Items [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net (277) (448)    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Tariff Flag [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net [2] (103) (11)    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Excess Demand and Reactive Power [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net (98) (83)    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Assets 1,286 1,184    
Current assets 1,286 1,184    
Liabilities (882) (1,140)    
Current liabilities (882) (1,140)    
Total current, net 404 44    
Financial assets (liabilities), net 404 44    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Quota For The Energy Development Account [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Current assets      
Liabilities      
Financial assets (liabilities), net 119 1    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Tariff For Use Of Transmission Facilities Of Grid Participants [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net (18) 24    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Tariff For Transport Of Electricity Provided By Itaiputs [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net 9 2    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Program To Encourage Alternative Sources Of Electricity Proinfa [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net 11 3    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | System Service Charges And Reserve Energy Charge [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net (161) (246)    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Energy Purchased For Resale [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net 661 667    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Overcontracting Of Supply [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net [1] (84) (204)    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Neutrality of Portion A [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net (30) 53    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Other Financial Items [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net (71) (236)    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Tariff Flag [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net [2]    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Last Tariff Adjustment [Member] | Excess Demand and Reactive Power [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net (32) (21)    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Assets 2,144 2,545    
Current assets 1,269 1,505    
Non-current assets 875 1,040    
Liabilities (1,666) (1,509)    
Current liabilities (1,033) (902)    
Non-current liabilities (633) (607)    
Total current, net 236 603    
Total non-current,net 242 433    
Financial assets (liabilities), net 478 1,036    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Quota For The Energy Development Account [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net 29 220    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Tariff For Use Of Transmission Facilities Of Grid Participants [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net 114 (6)    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Tariff For Transport Of Electricity Provided By Itaiputs [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net 16 16    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Program To Encourage Alternative Sources Of Electricity Proinfa [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net (6) 5    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | System Service Charges And Reserve Energy Charge [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net (136) (287)    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Energy Purchased For Resale [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net 632 1,402    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Overcontracting Of Supply [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net [1] 216 (13)    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Neutrality of Portion A [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net (12) (15)    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Other Financial Items [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net (206) (212)    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Tariff Flag [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net [2] (103) (11)    
CVA Account for Compensation Of Changes In Portion A Costs [Member] | Amounts Ratified By Aneel In The Next Tariff Adjustment [Member] | Excess Demand and Reactive Power [Member]        
Disclosure Of Financial Assets and Financial Liabilities [line items]        
Financial assets (liabilities), net R$ (66) R$ (62)    
[1] The wholly-owned subsidiary Cemig D was over contracted in 2017 and 2018 and the gain arising from the sale of the excess of energy in the spot market was provisionally passed through to customers by Aneel in the tariff adjustments of 2018 and 2019, including the portion in excess of the limit of 105% of the regulatory load - thus reducing the tariff that was determined. To establish whether this is a voluntary over contracting, the Company considers that the portion above the regulatory limit will be recovered in the subsequent tariff adjustment, when Aneel approves them. The Company has no expectation of loss in relation to realization of these amounts. The Company recognizes this right, in the amount of R$ 216,852, as 'Other financial components', to be approved by Aneel in the next forthcoming tariff adjustments.
[2] Billing arising from the 'Flag' Tariff System (see below) not yet approved by the regulator (Aneel).