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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 |

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