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18. INVESTMENTS (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about investment property [line items]      
Beginning balance R$ 5,235 R$ 7,792 R$ 8,694
Gain (loss) by equity method (Income statement) 125 (104) (252)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) 268 (119)  
Dividends (284) (354) (420)
Additions / acquisitions 33 511 292
Other 1 (626) 88
Disposals   (37) (569)
Reclassification to held for sale   (1,828)  
Gain (loss) by equity method (Other comprehensive income)     (41)
Ending balance 5,378 5,235 7,792
Companhia Transleste De Transmissao [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance   22
Gain (loss) by equity method (Income statement)     5
Dividends     (7)
Additions / acquisitions    
Other    
Disposals     (20)
Gain (loss) by equity method (Other comprehensive income)    
Ending balance    
Companhia Transudeste De Transmissao [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance   21
Gain (loss) by equity method (Income statement)     3
Dividends     (12)
Additions / acquisitions    
Other    
Disposals     (12)
Gain (loss) by equity method (Other comprehensive income)    
Ending balance    
Companhia Transirape De Transmissao [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance   24
Gain (loss) by equity method (Income statement)     4
Dividends     (6)
Additions / acquisitions    
Other    
Disposals     (22)
Gain (loss) by equity method (Other comprehensive income)    
Ending balance    
Companhia De Transmissao Centroeste De Minas [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 20 21 21
Gain (loss) by equity method (Income statement) 4 5 5
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)  
Dividends (6) (5)
Additions / acquisitions
Other
Disposals  
Reclassification to held for sale    
Gain (loss) by equity method (Other comprehensive income)    
Ending balance 24 20 21
Light [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [1] 1,534 [1] 1,070 [2]
Gain (loss) by equity method (Income statement)   19 [1] 35 [2]
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [1]   (231)  
Dividends   (8) [1] [2]
Additions / acquisitions   [1] [2]
Other   (59) [1] 432 [2]
Disposals   [1] [2]
Reclassification to held for sale [1]   (1,255)  
Gain (loss) by equity method (Other comprehensive income) [2]     (3)
Ending balance [1]   1,534
Axxiom Solucoes Tecnologicas [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [1] 12 [1] 19
Gain (loss) by equity method (Income statement) (7) [1] (7)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) 4 [1]  
Dividends [1]
Additions / acquisitions 9 [1]
Other (1) [1]
Disposals   [1]
Reclassification to held for sale [1]   (4)  
Gain (loss) by equity method (Other comprehensive income)    
Ending balance 13 [1] 12 [1]
Lepsa [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [2]   344
Gain (loss) by equity method (Income statement) [2]    
Dividends [2]    
Additions / acquisitions [2]    
Other [2]     (342)
Disposals [2]    
Gain (loss) by equity method (Other comprehensive income) [2]     (2)
Ending balance [2]    
RME [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [1] 383 [1] 339
Gain (loss) by equity method (Income statement)   3 [1] 7
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [1]   (52)  
Dividends   (1) [1]
Additions / acquisitions   104 [1] 38
Other   (111) [1] 1
Disposals   [1]
Reclassification to held for sale [1]   (326)  
Gain (loss) by equity method (Other comprehensive income)     (2)
Ending balance [1]   383
Hidreletrica Cachoeirao [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 49 58 50
Gain (loss) by equity method (Income statement) 11 10 10
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)  
Dividends (6) (19) (3)
Additions / acquisitions
Other 1
Disposals  
Reclassification to held for sale    
Gain (loss) by equity method (Other comprehensive income)    
Ending balance 54 49 58
Guanhaes Energia [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [1] 25 [1],[3] [3]
Gain (loss) by equity method (Income statement) 30 [1] (13) [3]
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) 131 [1]  
Dividends [1] [3]
Additions / acquisitions 57 [1] 97 [3]
Other [1] (59) [3]
Disposals   [1] [3]
Reclassification to held for sale [1]   (112)  
Gain (loss) by equity method (Other comprehensive income) [3]    
Ending balance 131 [1] 25 [1],[3]
Hidreletrica Pipoca [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 31 26 32
Gain (loss) by equity method (Income statement) 4 7 2
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)  
Dividends (4) (2) (8)
Additions / acquisitions
Other
Disposals  
Reclassification to held for sale    
Gain (loss) by equity method (Other comprehensive income)    
Ending balance 31 31 26
Madeira Energia (Santo Antonio plant) [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 270 [4],[5] 535 [4],[5] 644
Gain (loss) by equity method (Income statement) (103) (163) [4],[5] (109)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [4],[5]  
Dividends [4],[5]
Additions / acquisitions 25 [4],[5]
Other (127) [4],[5]
Disposals   [4],[5]
Reclassification to held for sale [4],[5]    
Gain (loss) by equity method (Other comprehensive income)    
Ending balance 167 270 [4],[5] 535 [4],[5]
FIP Melbourne (Santo Antonio plant) [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 470 [5] 582 [5] 677
Gain (loss) by equity method (Income statement)   (139) [5] (95)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [5]    
Dividends   [5]
Additions / acquisitions   27 [5]
Other   [5]
Disposals   [5]
Reclassification to held for sale [5]    
Gain (loss) by equity method (Other comprehensive income)    
Ending balance 385 470 [5] 582 [5]
Lightger [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [1] 41 [1] 42
Gain (loss) by equity method (Income statement) 3 [1] 2
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) 128 84 [1]  
Dividends (2) [1] (3)
Additions / acquisitions [1]
Other [1]
Disposals   [1]
Reclassification to held for sale [1]   (126)  
Gain (loss) by equity method (Other comprehensive income)    
Ending balance 128 [1] 41 [1]
Baguari Energia [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 162 148 162
Gain (loss) by equity method (Income statement) 22 28 17
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)  
Dividends (27) (15) (30)
Additions / acquisitions
Other 1 (1)
Disposals  
Reclassification to held for sale    
Gain (loss) by equity method (Other comprehensive income)    
Ending balance 157 162 148
Central Eolica Praias De Parajuru [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [6] 60 [6] 63
Gain (loss) by equity method (Income statement)   (6) [6] (1)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [6]   21  
Dividends   [6]
Additions / acquisitions   74 [6]
Other   (146) [6] (2)
Disposals   (3) [6]
Reclassification to held for sale [6]    
Gain (loss) by equity method (Other comprehensive income)    
Ending balance [6]   60
Central Eolica Volta do Rio [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [6] 68 [6] 81
Gain (loss) by equity method (Income statement)   (16) [6] (12)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [6]   59  
Dividends   [6]
Additions / acquisitions   92 [6]
Other   (181) [6] (1)
Disposals   (22) [6]
Reclassification to held for sale [6]    
Gain (loss) by equity method (Other comprehensive income)    
Ending balance [6]   68
Central Eolica Praias De Morgado [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [6] 51 [6] 60
Gain (loss) by equity method (Income statement)   (15) [6] (8)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [6]    
Dividends   [6]
Additions / acquisitions   [6]
Other   (24) [6] (1)
Disposals   (12) [6]
Reclassification to held for sale [6]    
Gain (loss) by equity method (Other comprehensive income)    
Ending balance [6]   51
Amazonia Energia (Belo Monte plant) [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 1,013 867 781
Gain (loss) by equity method (Income statement) 15 80 1
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)  
Dividends
Additions / acquisitions 69 85
Other (3)
Disposals  
Reclassification to held for sale    
Gain (loss) by equity method (Other comprehensive income)    
Ending balance 1,028 1,013 867
Ativas Data Center [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 16 17 18
Gain (loss) by equity method (Income statement) (1) (2)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)  
Dividends
Additions / acquisitions
Other 1
Disposals  
Reclassification to held for sale    
Gain (loss) by equity method (Other comprehensive income)    
Ending balance 16 16 17
TAESA [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 1,143 [1] 1,101 [1] 1,583 [7]
Gain (loss) by equity method (Income statement) 210 225 [1] 216 [7]
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [1]  
Dividends (141) (208) [1] (183) [7]
Additions / acquisitions [1] [7]
Other 1 25 [1] [7]
Disposals   [1] (515) [7]
Reclassification to held for sale [1]    
Gain (loss) by equity method (Other comprehensive income) [7]    
Ending balance 1,213 1,143 [1] 1,101 [1]
Renova [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 282 689
Gain (loss) by equity method (Income statement)   (282) (390)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)    
Dividends  
Additions / acquisitions   18
Other   (1)
Disposals  
Reclassification to held for sale    
Gain (loss) by equity method (Other comprehensive income)     (34)
Ending balance   282
Usina Hidreletrica Itaocara S.A. [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [1] 4 [1] 3
Gain (loss) by equity method (Income statement) (50) (4) [1] (2)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) 5 [1]  
Dividends [1]
Additions / acquisitions 23 5 [1] 3
Other 22 [1]
Disposals   [1]
Reclassification to held for sale [1]   (5)  
Gain (loss) by equity method (Other comprehensive income)    
Ending balance [1] 4 [1]
Alianca Geracao [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 1,217 1,242 1,319
Gain (loss) by equity method (Income statement) 78 65 72
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)  
Dividends (103) (90) (149)
Additions / acquisitions
Other
Disposals  
Reclassification to held for sale    
Gain (loss) by equity method (Other comprehensive income)    
Ending balance 1,192 1,217 1,242
Alianca Norte (Belo Monte plant) [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 664 577 527
Gain (loss) by equity method (Income statement) 6 44 (2)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)  
Dividends
Additions / acquisitions 1 43 51
Other 1
Disposals  
Reclassification to held for sale    
Gain (loss) by equity method (Other comprehensive income)    
Ending balance 671 664 577
Retiro Baixo [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 171 158 162
Gain (loss) by equity method (Income statement) 12 10 10
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)  
Dividends (3) (3) (14)
Additions / acquisitions 6
Other
Disposals  
Reclassification to held for sale    
Gain (loss) by equity method (Other comprehensive income)    
Ending balance 180 171 158
Total of Investments [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 5,235 7,792 8,753
Gain (loss) by equity method (Income statement) 125   (252)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) 268    
Dividends (284)   (420)
Additions / acquisitions 33   292
Other 23   29
Disposals     (569)
Gain (loss) by equity method (Other comprehensive income)     (41)
Ending balance 5,400 5,235 7,792
Guanhaes Energia - Equity Deficit [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [3]   (59)
Gain (loss) by equity method (Income statement) [3]    
Dividends [3]    
Additions / acquisitions [3]    
Other [3]     59
Disposals [3]    
Gain (loss) by equity method (Other comprehensive income) [3]    
Ending balance [3]    
UFV Janauba Geracao De Energia Eletrica Distribuida [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 9  
Gain (loss) by equity method (Income statement) 1  
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)  
Dividends  
Additions / acquisitions 9  
Other  
Disposals    
Reclassification to held for sale    
Ending balance 10 9
FIP Melbourne (Santo Antonio plant) [Member]      
Disclosure of detailed information about investment property [line items]      
Gain (loss) by equity method (Income statement) (85)    
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)    
Dividends    
Additions / acquisitions    
Other    
Itaocara - Equity Deficit [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance    
Gain (loss) by equity method (Income statement)    
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)    
Dividends    
Additions / acquisitions    
Other (22)    
Ending balance R$ (22)  
[1] Others arises from first adoption of the new accounting standards on January 1, 2018, recognized by the investees directly in equity without inclusion in the Income statement. The column Reclassification to held for sale includes the effect of the reclassification of the investment in Light, Axxion, Lightger, Guanhaes and Itaocara to Non-current assets held for sale, in accordance with IFRS 5.
[2] On November 30, 2017 the Company acquired all Lepsa's shares, and therefore as from that date on it consolidates that company in its financial statements. Lepsa's sole asset is its holdings in the share capital of Light. Hence, the Company no longer presents the investment that it previously held at Lepsa in its consolidated statement, presenting only the interest in Light.
[3] Equity deficit reversed through injection of capital.
[4] Due to the result of analysis of impairment indication, due to the recurring losses incurred by Madeira, a provision was recognized for loss of part of the residual added value of the investment in Madeira, to limit its balance to the minimum value of the excess of future economic benefits arising from use of the net fixed asset on December, 31, 2018, using the nominal WACC of 9.59% as the discount rate. The provision is presented in the statement of income for the year ended December 31, 2018 as Impairment loss on Investments.
[5] In October 2018 the Company subscribed capital increases in Mesa and FIP Melbourne, of R$25 and R$26, respectively. These funds were entirely applied in capital contributions to Santo Antonio Energia S.A. ('Saesa' or 'Santo Antonio Hydroelectric Plant').
[6] Arising from the business combination between the Company and Energimp. The rights to exploitation of the regulated activity are classified in the consolidated statement of financial position under Intangible.
[7] On November 2017 the Company sold part of its equity interest in the jointly-controlled entity Taesa. The Company sold 34 million Units of Taesa at the price of R$ 21.10 per Unit. With the sale, the Company's holding in the share capital of Taesa was reduced from 31.54% to 21.68%. The shares that were sold are not part of the controlling shareholding block of Taesa, and as a result Cemig continues to be in the controlling block of Taesa.