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Investments - Summary of Changes in Investments in Subsidiaries Jointly Controlled Entities and Affiliates (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about investment property [line items]      
Beginning balance R$ 7,792 R$ 8,753 R$ 9,745
Beginning balance 7,792 8,694 9,717
Gain (loss) by equity method (Income statement) (104) (252) (302)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) (119)    
Gain (loss) by equity method (Other comprehensive income)   (41) 1
Dividends (354) (420) (632)
Additions / acquisitions 511 292 1,455
Injections / acquisitions   292 1,455
Disposals (37) (569) (706)
Reclassification to held for sale (1,828)    
Other   88 (839)
Others (626) 29 (808)
Ending balance   7,792 8,694
Ending balance 5,235 7,792 8,753
Madeira Energia [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 535 644 676
Gain (loss) by equity method (Income statement) (163) (109) (71)
Additions / acquisitions 25   39
Others (127)    
Ending balance 270 535 644
Fip Melbourne [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 582 677 703
Gain (loss) by equity method (Income statement) (139) (95) (63)
Additions / acquisitions 27   40
Others     (3)
Ending balance 470 582 677
Ativas Data Center [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 17 18  
Gain (loss) by equity method (Income statement) (1) (2) (31)
Additions / acquisitions     99
Others   1 (50)
Ending balance 16 17 18
Beginning balance     (28)
Other     28
Companhia de Transmissao Centroeste de Minas [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 21 21 18
Gain (loss) by equity method (Income statement) 5 5 5
Dividends (6) (5) (2)
Ending balance 20 21 21
Light [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 1,534 1,070 1,188
Gain (loss) by equity method (Income statement) 19 35 (121)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) (231)    
Gain (loss) by equity method (Other comprehensive income)   (3) 3
Dividends (8)    
Reclassification to held for sale (1,255)    
Others (59) 432  
Ending balance   1,534 1,070
RME [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 383 339  
Gain (loss) by equity method (Income statement) 3 7 (20)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) (52)    
Gain (loss) by equity method (Other comprehensive income)   (2)  
Dividends (1)   (58)
Additions / acquisitions 104 38 247
Reclassification to held for sale (326)    
Merger     169
Others (111) 1 1
Ending balance   383 339
Axxiom Solucoes Tecnologicas [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 12 19 24
Gain (loss) by equity method (Income statement) (7) (7) (5)
Reclassification to held for sale (4)    
Others (1)    
Ending balance   12 19
Lightger [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 41 42 37
Gain (loss) by equity method (Income statement) 3 2 5
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) 84    
Dividends (2) (3)  
Reclassification to held for sale (126)    
Ending balance   41 42
Guanhaes energia [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 25   19
Gain (loss) by equity method (Income statement) 30 (13) (103)
Additions / acquisitions 57 97 25
Reclassification to held for sale (112)    
Others   (59) 59
Ending balance   25  
Beginning balance   (59)  
Other   59 (59)
Ending balance     (59)
Usina Hidreletrica Itaocara SA [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 4 3  
Gain (loss) by equity method (Income statement) (4) (2)  
Additions / acquisitions 5 3 3
Reclassification to held for sale (5)    
Ending balance   4 3
Hidreletrica Pipoca [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 26 32 27
Gain (loss) by equity method (Income statement) 7 2 5
Dividends (2) (8)  
Ending balance 31 26 32
Hidreletrica Cachoeirao [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 58 50 42
Gain (loss) by equity method (Income statement) 10 10 10
Dividends (19) (3) (2)
Others   1  
Ending balance 49 58 50
Baguari Energia [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 148 162 187
Gain (loss) by equity method (Income statement) 28 17 41
Dividends (15) (30) (14)
Others 1 (1) (52)
Ending balance 162 148 162
Central Eolica Praias de Parajuru [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 60 63 63
Gain (loss) by equity method (Income statement) (6) (1)  
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) 21    
Additions / acquisitions 74    
Disposals (3)    
Others (146) (2)  
Ending balance   60 63
Central Eolica Volta do Rio [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 68 81 85
Gain (loss) by equity method (Income statement) (16) (12) (4)
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) 59    
Additions / acquisitions 92    
Disposals (22)    
Others (181) (1)  
Ending balance   68 81
Central Eolica Praias de Morgado [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 51 60 62
Gain (loss) by equity method (Income statement) (15) (8) (2)
Disposals (12)    
Others (24) (1)  
Ending balance   51 60
Amazonia Energia [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 867 781 495
Gain (loss) by equity method (Income statement) 80 1 (6)
Additions / acquisitions 69 85 292
Others (3)    
Ending balance 1,013 867 781
Alianca Norte [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 577 527 354
Gain (loss) by equity method (Income statement) 44 (2) (7)
Additions / acquisitions 43 51 180
Others   1  
Ending balance 664 577 527
Taesa [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 1,101 1,583 2,242
Gain (loss) by equity method (Income statement) 225 216 342
Dividends (208) (183) (382)
Disposals   (515) (619)
Others 25    
Ending balance 1,143 1,101 1,583
Renova [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 282 689 1,527
Gain (loss) by equity method (Income statement) (282) (390) (372)
Gain (loss) by equity method (Other comprehensive income)   (34) 19
Additions / acquisitions   18 278
Others   (1) (763)
Ending balance   282 689
Alianca Geracao [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 1,242 1,319 1,327
Gain (loss) by equity method (Income statement) 65 72 104
Dividends (90) (149) (112)
Ending balance 1,217 1,242 1,319
Retiro Baixo [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 158 162 148
Gain (loss) by equity method (Income statement) 10 10 16
Dividends (3) (14) (2)
Additions / acquisitions 6    
Ending balance 171 158 162
UFV Janauba Geracao de Energia Eletrica Distribuida [member]      
Disclosure of detailed information about investment property [line items]      
Gain (loss) by equity method (Income statement) 0    
Additions / acquisitions 9    
Ending balance R$ 9    
Companhia Transleste de Transmissao [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance   22 18
Gain (loss) by equity method (Income statement)   5 6
Dividends   (7) (2)
Disposals   (20)  
Ending balance     22
Companhia Transudeste de Transmissao [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance   21 18
Gain (loss) by equity method (Income statement)   3 4
Dividends   (12) (1)
Disposals   (12)  
Ending balance     21
Companhia Transirape de Transmissao [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance   24 19
Gain (loss) by equity method (Income statement)   4 5
Dividends   (6)  
Disposals   (22)  
Ending balance     24
Transchile Charrua Transmision SA [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance     108
Gain (loss) by equity method (Income statement)     2
Gain (loss) by equity method (Other comprehensive income)     (23)
Disposals     (87)
Lepsa [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance   344  
Gain (loss) by equity method (Income statement)     (18)
Gain (loss) by equity method (Other comprehensive income)   (2) 1
Dividends     (57)
Additions / acquisitions     252
Merger     166
Others   R$ (342)  
Ending balance     344
Parati [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance     358
Gain (loss) by equity method (Income statement)     (24)
Gain (loss) by equity method (Other comprehensive income)     1
Merger     R$ (335)