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Investments - Movement of Investments in the Jointly-controlled Entities (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about investment property [line items]      
Beginning balance R$ 8,753 R$ 9,745  
Equity method gain (Statement of income) (252) (302)  
Equity method gain(Other comprehensive income) (41) 1  
Dividends (420) (632)  
Injections / acquisitions 292 1,455  
Sales (569) (706)  
Other 29 (808)  
Ending balance 7,792 8,753 R$ 9,745
Beginning balance 8,694 9,717 8,040
Equity method gain (Statement of income) (252) (302) 393
Equity method gain(Other comprehensive income) (41) 1 53
Dividends (420) (632) (475)
Injections / acquisitions 292 1,455 1,071
Sales (569) (706)  
Incorporation   0  
Other 88 (839) 635
Ending balance 7,792 8,694 9,717
Companhia Transleste de Transmissao [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 22 18 14
Equity method gain (Statement of income) 5 6 8
Dividends (7) (2) (4)
Sales (20)    
Ending balance   22 18
Companhia Transudeste de Transmissao [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 21 18 13
Equity method gain (Statement of income) 3 4 5
Dividends (12) (1)  
Sales (12)    
Ending balance   21 18
Companhia Transirape de Transmissao [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 24 19 13
Equity method gain (Statement of income) 4 5 6
Dividends (6)    
Sales (22)    
Ending balance   24 19
Transchile Charrua Transmision SA [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance   108 67
Equity method gain (Statement of income)   2 5
Equity method gain(Other comprehensive income)   (23) 36
Sales   (87)  
Ending balance     108
Companhia de Transmissao Centroeste de Minas [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 21 18 22
Equity method gain (Statement of income)   5 2
Dividends   (2) (6)
Ending balance 21 21 18
Light [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 1,070 1,188 1,198
Equity method gain (Statement of income) 35 (121) (11)
Equity method gain(Other comprehensive income) (3) 3 2
Dividends     (1)
Other 432    
Ending balance 1,534 1,070 1,188
Axxiom Solucoes Tecnologicas [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 19 24 23
Equity method gain (Statement of income) (7) (5) 1
Ending balance 12 19 24
Hidreletrica Cachoeirao [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 50 42 34
Equity method gain (Statement of income) 10 10 8
Dividends (3) (2)  
Other 1    
Ending balance 58 50 42
Guanhaes energia [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance   19 69
Equity method gain (Statement of income) (13) (103) (49)
Dividends     (1)
Injections / acquisitions 97 25  
Other (59) 59  
Ending balance 25   19
Beginning balance (59)    
Other 59 (59)  
Ending balance   (59)  
Hidreletrica Pipoca [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 32 27 28
Equity method gain (Statement of income) 2 5 2
Dividends (8)   (3)
Ending balance 26 32 27
Madeira Energia [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 644 676 674
Equity method gain (Statement of income) (109) (71) 2
Injections / acquisitions   39  
Ending balance 535 644 676
Fip Melbourne [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 677 703 708
Equity method gain (Statement of income) (95) (63) (5)
Injections / acquisitions   40  
Other   (3)  
Ending balance 582 677 703
Lightger [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 42 37 38
Equity method gain (Statement of income) 2 5 (1)
Dividends (3)    
Ending balance 41 42 37
Baguari Energia [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 162 187 193
Equity method gain (Statement of income) 17 41 12
Dividends (30) (14) (18)
Other (1) (52)  
Ending balance 148 162 187
Central Eolica Praias de Parajuru [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 63 63 62
Equity method gain (Statement of income) (1)   2
Dividends     (1)
Other (2)    
Ending balance 60 63 63
Central Eolica Volta do Rio [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 81 85 84
Equity method gain (Statement of income) (12) (4) 2
Dividends     (1)
Other (1)    
Ending balance 68 81 85
Central Eolica Praias de Morgado [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 60 62 62
Equity method gain (Statement of income) (8) (2)  
Other (1)    
Ending balance 51 60 62
Amazonia Energia [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 781 495 395
Equity method gain (Statement of income) 1 (6) (19)
Dividends     (1)
Injections / acquisitions 85 292 120
Ending balance 867 781 495
Ativas Data Center [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 18    
Equity method gain (Statement of income) (2) (31) (28)
Injections / acquisitions   99  
Other 1 (50) 28
Ending balance 17 18  
Beginning balance   (28)  
Other   28 (28)
Ending balance     (28)
Epicaresempreend Imentos [Member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance     92
Equity method gain (Statement of income)     1
Dividends     1
Other     (94)
Parati [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance   358 372
Equity method gain (Statement of income)   (24) 3
Equity method gain(Other comprehensive income)   1  
Dividends     (17)
Incorporation   (335)  
Ending balance     358
Taesa [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 1,583 2,242 2,188
Equity method gain (Statement of income) 216 342 383
Dividends (183) (382) (329)
Sales (515) (619)  
Ending balance 1,101 1,583 2,242
Renova [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 689 1,527 1,538
Equity method gain (Statement of income) (390) (372) (25)
Equity method gain(Other comprehensive income) (34) 19 15
Dividends     (1)
Injections / acquisitions 18 278  
Other (1) (763)  
Ending balance 282 689 1,527
Alianca Geracao [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 1,319 1,327 3
Equity method gain (Statement of income) 72 104 107
Dividends (149) (112) (93)
Injections / acquisitions     581
Other     729
Ending balance 1,242 1,319 1,327
Alianca Norte [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 527 354  
Equity method gain (Statement of income) (2) (7) (13)
Injections / acquisitions 51 180 367
Other 1    
Ending balance 577 527 354
Retiro Baixo [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 162 148 150
Equity method gain (Statement of income) 10 16 (5)
Dividends (14) (2)  
Injections / acquisitions     3
Ending balance 158 162 R$ 148
Luce [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 344    
Equity method gain (Statement of income)   (18)  
Equity method gain(Other comprehensive income)   1  
Dividends   (57)  
Injections / acquisitions   252  
Incorporation   166  
Ending balance   344  
RME [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 339    
Equity method gain (Statement of income) 7 (20)  
Equity method gain(Other comprehensive income) (2)    
Dividends   (58)  
Injections / acquisitions 38 247  
Incorporation   169  
Other 1 1  
Ending balance 383 339  
Usina Hidreletrica Itaocara SA [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 3    
Equity method gain (Statement of income) (2)    
Injections / acquisitions 3 3  
Ending balance 4 3  
Companhia De Transmissa Centroeste De Minas [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 21    
Equity method gain (Statement of income) 5    
Dividends (5)    
Ending balance 21 21  
Lepsa [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 344    
Equity method gain(Other comprehensive income) (2)    
Other R$ (342)    
Ending balance   R$ 344