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16. INVESTMENTS (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about investment property [line items]      
Beginning balance R$ 5,378 R$ 5,235  
Gain (loss) by equity method (Income statement) 357 [1] 125  
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) 37 268  
Dividends (399) (284)  
Additions / acquisitions 119 33  
Other 13 1  
Disposals (120)    
Reclassification to held for sale    
Ending balance 5,385 5,378 R$ 5,235
Companhia de transmissao centroeste de minas [member]      
Disclosure of detailed information about investment property [line items]      
Gain (loss) by equity method (Income statement)     5
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)    
Dividends     (6)
Additions / acquisitions    
Other    
Disposals    
Reclassification to held for sale    
Light [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [2]   1,534
Gain (loss) by equity method (Income statement) [2]     19
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [2]     (231)
Dividends [2]     (8)
Additions / acquisitions [2]    
Other [2]     (59)
Disposals [2]    
Reclassification to held for sale [2]     (1,255)
Ending balance [2]    
RME [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [2]   383
Gain (loss) by equity method (Income statement) [2]     3
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [2]     (52)
Dividends [2]     (1)
Additions / acquisitions [2]     104
Other [2]     (111)
Disposals [2]    
Reclassification to held for sale [2]     (326)
Ending balance [2]    
Axxiom solucoes tecnologicas [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 13 [2] 12 [2]
Gain (loss) by equity method (Income statement) (9) [1],[3] (7) [2]
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [3] 4 [2]
Dividends [3] [2]
Additions / acquisitions [3] 9 [2]
Other [3] (1) [2]
Disposals [3]   [2]
Reclassification to held for sale [2]     (4)
Ending balance 4 [3] 13 [2]
Lightger [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 128 [2] 41 [2]
Gain (loss) by equity method (Income statement) 10 [1],[3] 3 [2]
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [3] 128 84 [2]
Dividends (7) [3] (2) [2]
Additions / acquisitions [3] [2]
Other [3] [2]
Disposals [3]   [2]
Reclassification to held for sale [2]     (126)
Ending balance 131 [3] 128 [2]
Guanhaes energia [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 131 [2] 25 [2]
Gain (loss) by equity method (Income statement) [1],[3] 30 [2]
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [3] 131 [2]
Dividends [3] [2]
Additions / acquisitions [3] 57 [2]
Other [3] [2]
Disposals [3]   [2]
Reclassification to held for sale [2]     (112)
Ending balance 131 [3] 131 [2]
Usina hidreletrica itaocara S.A. [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [2] 4 [2]
Gain (loss) by equity method (Income statement)   (50) (4) [2]
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)   5 [2]
Dividends   [2]
Additions / acquisitions   23 5 [2]
Other   22 [2]
Disposals [2]    
Reclassification to held for sale [2]     (5)
Ending balance   [2]
Hidreletrica pipoca [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 31 31 26
Gain (loss) by equity method (Income statement) 11 [1] 4 7
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)
Dividends (6) (4) (2)
Additions / acquisitions
Other
Disposals  
Reclassification to held for sale    
Ending balance 36 31 31
Madeira energia (santo antonio plant) [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 167 270 [4],[5] 535 [4],[5]
Gain (loss) by equity method (Income statement) 42 [1] (103) (163) [4],[5]
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]    
Ending balance 209 167 270 [4],[5]
FIP melbourne (usina de santo antonio) [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 385 470 [5] 582 [5]
Gain (loss) by equity method (Income statement)   (85) (139) [5]
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]    
Ending balance   385 470 [5]
Hidreletrica cachoeirao [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 54 49 58
Gain (loss) by equity method (Income statement) 9 [1] 11 10
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)
Dividends (10) (6) (19)
Additions / acquisitions
Other
Disposals  
Reclassification to held for sale    
Ending balance 53 54 49
Baguari energia [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 157 162 148
Gain (loss) by equity method (Income statement) 23 [1] 22 28
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)
Dividends (21) (27) (15)
Additions / acquisitions
Other 1
Disposals  
Reclassification to held for sale    
Ending balance 159 157 162
Central eolica praias de parajuru [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [6]   60
Gain (loss) by equity method (Income statement) [6]     (6)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [6]     21
Dividends [6]    
Additions / acquisitions [6]     74
Other [6]     (146)
Disposals [6]     (3)
Reclassification to held for sale [6]    
Ending balance [6]    
Central eolica volta do rio [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [6]   68
Gain (loss) by equity method (Income statement) [6]     (16)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [6]     59
Dividends [6]    
Additions / acquisitions [6]     92
Other [6]     (181)
Disposals [6]     (22)
Reclassification to held for sale [6]    
Ending balance [6]    
Central eolica praias de morgado [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance [6]   51
Gain (loss) by equity method (Income statement) [6]     (15)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [6]    
Dividends [6]    
Additions / acquisitions [6]    
Other [6]     (24)
Disposals [6]     (12)
Reclassification to held for sale [6]    
Ending balance [6]    
Amazonia energia (belo monte plant) [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 1,028 1,013 867
Gain (loss) by equity method (Income statement) (63) [1] 15 80
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)
Dividends
Additions / acquisitions 69
Other (3)
Disposals  
Reclassification to held for sale    
Ending balance 965 1,028 1,013
Alianca norte (belo monte plant) [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 671 664 577
Gain (loss) by equity method (Income statement) (40) [1] 6 44
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)
Dividends
Additions / acquisitions 1 43
Other
Disposals  
Reclassification to held for sale    
Ending balance 631 671 664
Ativas data center [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 16 16 17
Gain (loss) by equity method (Income statement) 1 [1] (1)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)
Dividends
Additions / acquisitions
Other
Disposals  
Reclassification to held for sale    
Ending balance 17 16 16
TAESA [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 1,213 1,143 [2] 1,101 [2]
Gain (loss) by equity method (Income statement) 494 [1] 210 225 [2]
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [2]
Dividends (240) (141) (208) [2]
Additions / acquisitions [2]
Other 1 25 [2]
Disposals   [2]
Reclassification to held for sale [2]    
Ending balance 1,467 1,213 1,143 [2]
Renova [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance   282
Gain (loss) by equity method (Income statement)     (282)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)    
Dividends    
Additions / acquisitions    
Other    
Disposals    
Reclassification to held for sale    
Ending balance    
Alianca geracao [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 1,192 1,217 1,242
Gain (loss) by equity method (Income statement) 89 [1] 78 65
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)
Dividends (114) (103) (90)
Additions / acquisitions
Other
Disposals  
Reclassification to held for sale    
Ending balance 1,167 1,192 1,217
Retiro baixo [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 180 171 158
Gain (loss) by equity method (Income statement) 15 [1] 12 10
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)
Dividends (3) (3)
Additions / acquisitions 6
Other
Disposals  
Reclassification to held for sale    
Ending balance 195 180 171
UFV janauba geracao de energia eletrica distribuida [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 10 9
Gain (loss) by equity method (Income statement) 1 [1] 1
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)
Dividends (1)
Additions / acquisitions 9
Other
Disposals  
Reclassification to held for sale    
Ending balance 10 10 9
Total of investments [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 5,400 5,235 7,792
Gain (loss) by equity method (Income statement) 366 [1] 125 (104)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) 37 268 (119)
Dividends (399) (284) (354)
Additions / acquisitions 118 33 511
Other 13 23 (626)
Disposals (120)   (37)
Reclassification to held for sale     (1,828)
Ending balance 5,415 5,400 5,235
Companhia de transmissao centroeste de minas [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 24 20 21
Gain (loss) by equity method (Income statement) [1] 4  
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) 37  
Dividends  
Additions / acquisitions 45  
Other 14  
Disposals (120)    
Ending balance 24 20
Itaocara - equity deficit [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance (22) [7]  
Gain (loss) by equity method (Income statement) (9) [1],[7]  
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) [7]  
Dividends [7]  
Additions / acquisitions 1 [7]  
Other [7] (22)  
Disposals [7]    
Ending balance (30) [7] (22) [7]
FIP Melbourne (Santo Antonio plant) [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 385    
Gain (loss) by equity method (Income statement) [1] (227)    
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)    
Dividends    
Additions / acquisitions    
Other    
Disposals    
Ending balance 158 385  
UFV Corinto Geracao de Energia Eletrica Distribuida [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance    
Gain (loss) by equity method (Income statement) [1] 1    
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)    
Dividends    
Additions / acquisitions 9    
Other    
Disposals    
Ending balance 10  
UFV Manga Geracao de Energia Eletrica Distribuida [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance    
Gain (loss) by equity method (Income statement) [1] 1    
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)    
Dividends    
Additions / acquisitions 10    
Other    
Disposals    
Ending balance 11  
UFV Bonfinopolis II Geracao de Energia Eletrica Distribuida [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance    
Gain (loss) by equity method (Income statement) [1]    
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)    
Dividends    
Additions / acquisitions 6    
Other    
Disposals    
Ending balance 6  
UFV lagoa grande geracao de energia eletrica distribuida [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance    
Gain (loss) by equity method (Income statement) [1] 3    
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)    
Dividends    
Additions / acquisitions 12    
Other    
Disposals    
Ending balance 15  
UFV lontra geracao de energia eletrica distribuida [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance    
Gain (loss) by equity method (Income statement) [1] 3    
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)    
Dividends    
Additions / acquisitions 14    
Other    
Disposals    
Ending balance 17  
UFV mato verde geracao de energia eletrica distribuida [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance    
Gain (loss) by equity method (Income statement) [1] 1    
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)    
Dividends    
Additions / acquisitions 5    
Other    
Disposals    
Ending balance 6  
UFV mirabela geracao de energia eletrica distribuida [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance    
Gain (loss) by equity method (Income statement) [1]    
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)    
Dividends    
Additions / acquisitions 5    
Other (1)    
Disposals    
Ending balance 4  
UFV porteirinha i geracao de energia eletrica distribuida [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance    
Gain (loss) by equity method (Income statement) [1]    
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)    
Dividends    
Additions / acquisitions 6    
Other    
Disposals    
Ending balance 6  
UFV porteirinha ii geracao de energia eletrica distribuida [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance    
Gain (loss) by equity method (Income statement) [1] 1    
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)    
Dividends    
Additions / acquisitions 6    
Other    
Disposals    
Ending balance R$ 7  
[1] Includes bargain purchase related to the acquisition of the joint-controlled entities UFV Corinto, UFV Manga, UFV Lagoa Grande, UFV Lontra, UFV Mato Verde and UFV Porteirinha II, in the amount of R$7.
[2] 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.
[3] With the loss of control of Light, the remaining equity interest in these investees was recognized as an investment in affiliates or jointly-controlled subsidiaries, and measured by the equity method, in accordance with IFRS 10. More details see notes 1 and 33.
[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 December 31, 2019, the investee had negative shareholders' equity. Thus, after reducing the accounting value of its interest to zero, the Company recognized the provision for losses on investments, in the amount of R$22, resulting from contractual obligations assumed with the subsidiary and the other shareholders.