XML 121 R114.htm IDEA: XBRL DOCUMENT
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Investments - Percentage of the Company's Equity Interest (Detail) - BRL (R$) R$ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure of detailed information about investment property [line items] |  |  |  |
Investments in associates accounted for using equity method gross | R$ 7,792 | R$ 8,753 | R$ 9,745 |
Investments in associates accounted for using equity method | R$ 7,792 | 8,694 | 9,717 | R$ 8,040
Hidreletrica Cachoeirao [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 58 | 50 | 42 | 34
Guanhaes energia [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 25 |  | 19 | 69
Hidreletrica Pipoca [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 26 | 32 | 27 | 28
Retiro Baixo [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 158 | 162 | 148 | 150
Alianca Norte [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 577 | 527 | 354 |
Madeira Energia [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Affiliated |  |  |
Investments in associates accounted for using equity method gross | R$ 535 | 644 | 676 | 674
Fip Melbourne [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Affiliated |  |  |
Investments in associates accounted for using equity method gross | R$ 582 | 677 | 703 | 708
Lightger [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 41 | 42 | 37 | 38
Baguari Energia [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 148 | 162 | 187 | 193
Renova [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 282 | 689 | 1,527 | 1,538
Alianca Geracao [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 1,242 | 1,319 | 1,327 | 3
Central Eolica Praias de Parajuru [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 60 | 63 | 63 | 62
Central Eolica Volta do Rio [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 68 | 81 | 85 | 84
Central Eolica Praias de Morgado [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 51 | 60 | 62 | 62
Amazonia Energia [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 867 | 781 | 495 | 395
Usina Hidreletrica Itaocara SA [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 4 | 3 |  |
Light [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 1,534 | 1,070 | 1,188 | 1,198
Taesa [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 1,101 | 1,583 | 2,242 | 2,188
Ativas Data Center [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Affiliated |  |  |
Investments in associates accounted for using equity method gross | R$ 17 | 18 |  |
Lepsa [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Subsidiary |  |  |
Investments in associates accounted for using equity method gross |  | 344 |  |
RME [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 383 | 339 |  |
Companhia Transleste de Transmissao [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross |  | 22 | 18 | 14
Companhia Transudeste de Transmissao [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross |  | 21 | 18 | 13
Companhia Transirape de Transmissao [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross |  | 24 | 19 | 13
Companhia de Transmissao Centroeste de Minas [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 21 | 21 | 18 | 22
Axxiom Solucoes Tecnologicas [Member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments in associates accounted for using equity method gross | R$ 12 | 19 | R$ 24 | R$ 23
Guanhaes [Member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Description of how acquirer obtained control of acquiree | Jointly-controlled |  |  |
Investments accounted for using equity method [member] | Guanhaes [Member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Investments in associates accounted for using equity method |  | R$ (59) |  |

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