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Investments - Summarized Financial Information of the Company's Equity Investees (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets        
Current R$ 8,537 R$ 8,286    
Cash and cash equivalents 1,030 995    
Non-current 33,703 33,750    
Total assets 42,240 42,036    
Liabilities        
Current 8,663 11,447    
Suppliers 2,343 1,940    
Non-current 19,247 17,655    
Equity 14,330 12,934 R$ 12,988 R$ 11,285
Total liabilities 27,910 29,102    
Statement of income        
Net sales revenue 21,712 18,773 21,868  
Cost of sales (17,488) (14,430) (15,783)  
Depreciation and amortization (787) (802) (811)  
GROSS PROFIT 4,224 4,343 6,085  
General and administrative expenses (763) (667) (674)  
Net Finance income (expenses) (996) (1,437) (1,341)  
Provision for loss (854) (704) (1,401)  
Finance income 804 1,041 863  
Finance expenses 1,800 2,478 2,204  
Income before income tax and social contribution tax 1,646 367 3,362  
Net income (loss) for the year 1,002 334 2,469  
Comprehensive income (loss) for the year 700 (220) 2,162  
Parati [member]        
Assets        
Current   12    
Cash and cash equivalents   8    
Non-current   1,327    
Total assets   1,339    
Liabilities        
Equity   1,339    
Total liabilities   1,339    
Statement of income        
General and administrative expenses   (6)    
Finance income   4    
Finance expenses   60    
Income before income tax and social contribution tax   (62)    
Net income (loss) for the year   (62)    
Comprehensive income (loss) effects   1    
Comprehensive income (loss) for the year   (61)    
Transleste [member]        
Assets        
Current   50 47  
Cash and cash equivalents   3 8  
Non-current   123 128  
Total assets   173 175  
Liabilities        
Current   28 18  
Loans and financings - Current   18 6  
Non-current   63 84  
Equity   82 73  
Total liabilities   173 175  
Statement of income        
Net sales revenue   34 33  
Cost of sales   (2) (4)  
GROSS PROFIT   32 29  
Net Finance income (expenses)     (9)  
Finance income   2 2  
Finance expenses   11 11  
Income before income tax and social contribution tax   23 20  
Income and Social Contribution taxes   (2) (2)  
Net income (loss) for the year   21 18  
Comprehensive income (loss) for the year   21 18  
Transirape [member]        
Assets        
Current   41 34  
Cash and cash equivalents   2 6  
Non-current   122 114  
Total assets   163 148  
Liabilities        
Current   33 20  
Loans and financings - Current   19 3  
Non-current   32 49  
Equity   98 79  
Total liabilities   163 148  
Statement of income        
Net sales revenue   45 34  
Cost of sales   (19) (13)  
GROSS PROFIT   26 21  
General and administrative expenses   (1)    
Net Finance income (expenses)     (5)  
Finance income   1 1  
Finance expenses   5 6  
Income before income tax and social contribution tax   21 16  
Income and Social Contribution taxes   (2) (1)  
Net income (loss) for the year   19 15  
Comprehensive income (loss) for the year   19 15  
Centroeste [member]        
Assets        
Current 56 61 58  
Cash and cash equivalents 17 20 16  
Non-current 1 1 1  
Total assets 57 62 59  
Liabilities        
Current 4 5 4  
Loans and financings - Current 3 3 2  
Non-current 13 15 21  
Equity 40 42 34  
Total liabilities 57 62 59  
Statement of income        
Net sales revenue 15 13 14  
Cost of sales (4) (2) (4)  
Depreciation and amortization (1) (1) (1)  
GROSS PROFIT 11 11 10  
Net Finance income (expenses)     (3)  
Finance income 2 4 2  
Finance expenses 2 3 5  
Income before income tax and social contribution tax 11 12 7  
Income and Social Contribution taxes (1) (1) (1)  
Net income (loss) for the year 10 11 6  
Comprehensive income (loss) for the year 10 11 6  
Transudeste [member]        
Assets        
Current   32 32  
Cash and cash equivalents   4 6  
Non-current   78 81  
Total assets   110 113  
Liabilities        
Current   22 17  
Loans and financings - Current   19    
Non-current   3 23  
Equity   85 73  
Total liabilities   110 113  
Statement of income        
Net sales revenue   22 22  
Cost of sales   (1) (2)  
GROSS PROFIT   21 20  
General and administrative expenses   (1)    
Net Finance income (expenses)     (5)  
Finance income   1 1  
Finance expenses   4 6  
Income before income tax and social contribution tax   17 15  
Income and Social Contribution taxes   (1) (1)  
Net income (loss) for the year   16 14  
Comprehensive income (loss) for the year   16 14  
Luce [member]        
Assets        
Current   6    
Non-current   437    
Total assets   443    
Liabilities        
Equity   443    
Total liabilities   443    
Statement of income        
General and administrative expenses   (1)    
Finance expenses   41    
Income before income tax and social contribution tax   (42)    
Net income (loss) for the year   (42)    
Comprehensive income (loss) for the year   (42)    
Rio Minas Energia Participacoes SA [member]        
Assets        
Current   3    
Non-current   437    
Total assets   440    
Liabilities        
Equity   440    
Total liabilities   440    
Statement of income        
General and administrative expenses   (1)    
Finance income   1    
Finance expenses   41    
Income before income tax and social contribution tax   (41)    
Net income (loss) for the year   (41)    
Comprehensive income (loss) for the year   (41)    
Light SA [member]        
Assets        
Current   3,612    
Cash and cash equivalents   668    
Non-current   10,718    
Total assets   14,330    
Liabilities        
Current   4,871    
Suppliers   1,342    
Loans and financings - Current   15,568    
Non-current   6,105    
Equity   3,354    
Total liabilities   14,330    
Statement of income        
Net sales revenue   9,645    
Cost of sales   (8,042)    
Depreciation and amortization   (452)    
GROSS PROFIT   1,603    
General and administrative expenses   (753)    
Finance income   148    
Finance expenses   1,281    
Income before income tax and social contribution tax   (283)    
Income and Social Contribution taxes   (30)    
Net income (loss) for the year   (313)    
Comprehensive income (loss) effects   3    
Comprehensive income (loss) for the year   (310)    
Transmissora Alianca de Energia Eletrica S.A. [member]        
Assets        
Current   1,955    
Cash and cash equivalents   102    
Non-current   6,456    
Total assets   8,411    
Liabilities        
Current   1,074    
Suppliers   37    
Loans and financings - Current   9    
Non-current   3,029    
Equity   4,308    
Total liabilities   8,411    
Statement of income        
Net sales revenue   1,391    
Cost of sales   (149)    
Depreciation and amortization   (1)    
GROSS PROFIT   1,242    
General and administrative expenses   (107)    
Finance income   58    
Finance expenses   223    
Income before income tax and social contribution tax   970    
Income and Social Contribution taxes   (108)    
Net income (loss) for the year   862    
Comprehensive income (loss) for the year   862    
Axxiom [member]        
Assets        
Current 46 66 74  
Cash and cash equivalents 3 9 7  
Non-current 11 13 14  
Total assets 57 79 88  
Liabilities        
Current 29 32 34  
Suppliers 1 1 2  
Loans and financings - Current 5 10 5  
Non-current 4 8 5  
Equity 24 39 49  
Total liabilities 57 79 88  
Statement of income        
Net sales revenue 43 57 66  
Cost of sales (55) (64) (59)  
Depreciation and amortization (2) (2) (1)  
GROSS PROFIT (12) (7) 7  
General and administrative expenses (7) (8) (6)  
Finance income 1 1 1  
Finance expenses 1   1  
Income before income tax and social contribution tax (19) (14) 1  
Income and Social Contribution taxes 6 5    
Net income (loss) for the year (13) (9) 1  
Comprehensive income (loss) for the year (13) (9) 1  
Alianca Norte Energia Participacoes S A [member]        
Assets        
Current 1 2    
Cash and cash equivalents   2    
Non-current 1,065 1,075    
Total assets 1,066 1,077    
Liabilities        
Equity 1,066 1,077    
Total liabilities 1,066 1,077    
Statement of income        
General and administrative expenses (1) (2)    
Finance expenses   7    
Income before income tax and social contribution tax (1) (9)    
Net income (loss) for the year (1) (9)    
Comprehensive income (loss) for the year (1) (9)    
RME [member]        
Assets        
Current 2      
Cash and cash equivalents 1      
Non-current 451      
Total assets 453      
Liabilities        
Equity 453      
Total liabilities 453      
Statement of income        
General and administrative expenses (1)      
Finance income 16      
Income before income tax and social contribution tax 15      
Net income (loss) for the year 15      
Comprehensive income (loss) effects (2)      
Comprehensive income (loss) for the year 13      
Light [member]        
Assets        
Current 4,250   3,976  
Cash and cash equivalents 342   447  
Non-current 11,181   11,818  
Total assets 15,431   15,794  
Liabilities        
Current 5,575   4,399  
Suppliers 2,023   1,450  
Loans and financings - Current 1,373   1,629  
Non-current 6,394   6,838  
Equity 3,462   4,557  
Total liabilities 15,431   15,794  
Statement of income        
Net sales revenue 11,315   1,222  
Cost of sales     (460)  
Depreciation and amortization     (412)  
GROSS PROFIT 11,315   762  
General and administrative expenses (9,941)   (91)  
Net Finance income (expenses)     (672)  
Finance income 136   1,371  
Finance expenses 1,212   2,043  
Income before income tax and social contribution tax 298   (1)  
Income and Social Contribution taxes (174)   (40)  
Net income (loss) for the year 124   (41)  
Comprehensive income (loss) effects (15)   8  
Comprehensive income (loss) for the year 109   (33)  
Taesa [member]        
Assets        
Current 1,970   2,082  
Cash and cash equivalents 2   132  
Non-current 6,608   7,574  
Total assets 8,578   9,656  
Liabilities        
Current 736   1,008  
Suppliers 48   34  
Loans and financings - Current     628  
Non-current 3,495   3,477  
Equity 4,347   5,171  
Total liabilities 8,578   9,656  
Statement of income        
Net sales revenue 1,104   1,973  
Cost of sales (209)   (287)  
Depreciation and amortization (1)   (15)  
GROSS PROFIT 895   1,686  
General and administrative expenses (124)      
Net Finance income (expenses)     (562)  
Finance income 368   769  
Finance expenses 434   1,331  
Income before income tax and social contribution tax 705   1,124  
Income and Social Contribution taxes (58)   (241)  
Net income (loss) for the year 647   883  
Comprehensive income (loss) for the year 647   883  
Itaocara hydroelectric plant [Member]        
Assets        
Current 5      
Cash and cash equivalents 5      
Non-current 11      
Total assets 16      
Liabilities        
Current 1      
Suppliers 1      
Non-current 7      
Equity 8      
Total liabilities 16      
Statement of income        
Cost of sales (4)      
GROSS PROFIT (4)      
Income before income tax and social contribution tax (4)      
Net income (loss) for the year (4)      
Comprehensive income (loss) for the year (4)      
Lightger [member]        
Assets        
Current 51 35 23  
Cash and cash equivalents 1 32 14  
Non-current 142 152 161  
Total assets 193 187 184  
Liabilities        
Current 31 16 14  
Suppliers 20 6 4  
Non-current 79 86 94  
Equity 83 85 76  
Total liabilities 193 187 184  
Statement of income        
Net sales revenue 42 36 32  
Cost of sales (28) (17) (25)  
Depreciation and amortization (11) (11) (10)  
GROSS PROFIT 14 19 7  
General and administrative expenses (2) (1) (1)  
Net Finance income (expenses)     (7)  
Finance income 4 3 2  
Finance expenses 9 10 (9)  
Income before income tax and social contribution tax 7 11 (1)  
Income and Social Contribution taxes (3) (3) (2)  
Net income (loss) for the year 4 8 (3)  
Comprehensive income (loss) for the year 4 8 (3)  
Amazonia Energia [member]        
Assets        
Non-current 1,163 1,048 666  
Total assets 1,163 1,048 666  
Liabilities        
Equity 1,163 1,048 666  
Total liabilities 1,163 1,048 666  
Statement of income        
General and administrative expenses (1) (1) (2)  
Net Finance income (expenses)     (23)  
Finance income 2      
Finance expenses   8 (23)  
Income before income tax and social contribution tax 1 (9) (25)  
Net income (loss) for the year 1 (9) (25)  
Comprehensive income (loss) for the year 1 (9) (25)  
Alianca Geracao [member]        
Assets        
Current 622 388 243  
Cash and cash equivalents 468 147 70  
Non-current 2,398 2,512 3,093  
Total assets 3,020 2,900 3,336  
Liabilities        
Current 448 592 113  
Suppliers 44 101 36  
Loans and financings - Current 84      
Non-current 714 335 274  
Equity 1,858 1,973 2,949  
Total liabilities 3,020 2,900 3,336  
Statement of income        
Net sales revenue 920 804 797  
Cost of sales (554) (314) (442)  
Depreciation and amortization (127) (125) (69)  
GROSS PROFIT 366 490 355  
General and administrative expenses (11) (58) (69)  
Net Finance income (expenses)     (18)  
Finance income 30 46 9  
Finance expenses 65 58 (27)  
Income before income tax and social contribution tax 320 420 268  
Income and Social Contribution taxes (104) (127) (30)  
Net income (loss) for the year 216 293 238  
Comprehensive income (loss) for the year 216 293 238  
Hidreletrica Cachoeirao [member]        
Assets        
Current 51      
Cash and cash equivalents 46      
Non-current 87      
Total assets 138      
Liabilities        
Current 10      
Suppliers 1      
Non-current 10      
Equity 118      
Total liabilities 138      
Statement of income        
Net sales revenue 39      
Cost of sales (17)      
Depreciation and amortization (4)      
GROSS PROFIT 22      
Finance income 4      
Finance expenses 2      
Income before income tax and social contribution tax 24      
Income and Social Contribution taxes (3)      
Net income (loss) for the year 21      
Comprehensive income (loss) for the year 21      
Baguari Energia [member]        
Assets        
Current 29 45 72  
Cash and cash equivalents 5 11 9  
Non-current 209 220 220  
Total assets 238 265 292  
Liabilities        
Current 18 12 16  
Suppliers 10 6 6  
Non-current 6 5 6  
Equity 214 248 270  
Total liabilities 238 265 292  
Statement of income        
Net sales revenue 64 65 59  
Cost of sales (37) (12) (46)  
Depreciation and amortization (9) (9) (9)  
GROSS PROFIT 27 53 13  
General and administrative expenses   (1)    
Net Finance income (expenses)     9  
Finance income 6 15 10  
Finance expenses   1 (1)  
Income before income tax and social contribution tax 33 66 22  
Income and Social Contribution taxes (11) (7) (5)  
Net income (loss) for the year 22 59 17  
Comprehensive income (loss) for the year 22 59 17  
Guanhaes energia [member]        
Assets        
Current 11 16 2  
Cash and cash equivalents 7 1 1  
Non-current 42 65 248  
Total assets 53 81 250  
Liabilities        
Current 2 191 212  
Non-current   11    
Equity 51 (121) 38  
Total liabilities 53 81 250  
Statement of income        
Cost of sales (1)      
GROSS PROFIT (1)      
General and administrative expenses     (86)  
Net Finance income (expenses)     (14)  
Provision for loss (22)      
Finance income 1      
Finance expenses 3 208 (14)  
Income before income tax and social contribution tax (25) (208) (100)  
Net income (loss) for the year (25) (208) (100)  
Comprehensive income (loss) for the year (25) (208) (100)  
Madeira Energia [member]        
Assets        
Current 557 1,520 1,608  
Cash and cash equivalents 55 58 300  
Non-current 23,594 23,557 23,754  
Total assets 24,151 25,077 25,362  
Liabilities        
Current 2,031 3,131 2,151  
Suppliers 203 662 384  
Non-current 16,793 15,527 15,569  
Equity 5,327 6,419 7,642  
Total liabilities 24,151 25,077 25,362  
Statement of income        
Net sales revenue 2,971 2,803 2,605  
Cost of sales (1,859) (1,845) (1,103)  
Depreciation and amortization   (673) (471)  
GROSS PROFIT 1,112 958 1,502  
General and administrative expenses (817) (146) (816)  
Net Finance income (expenses)     (967)  
Finance income 115 146 950  
Finance expenses 1,551 1,552 (1,917)  
Income before income tax and social contribution tax (1,141) (594) (281)  
Income and Social Contribution taxes 49 (23) 266  
Net income (loss) for the year (1,092) (617) (15)  
Comprehensive income (loss) for the year (1,092) (617) (15)  
Pipoca [member]        
Assets        
Current 15 20 13  
Cash and cash equivalents 6 17    
Non-current 95 98 101  
Total assets 110 118 114  
Liabilities        
Current 18 8 10  
Suppliers 6      
Non-current 39 45 50  
Equity 53 65 54  
Total liabilities 110 118 114  
Statement of income        
Net sales revenue 29 25 22  
Cost of sales (18) (6) (11)  
Depreciation and amortization (3) (3) (3)  
GROSS PROFIT 11 19 11  
General and administrative expenses (1) (2) (2)  
Net Finance income (expenses)     (3)  
Finance income 2 2 2  
Finance expenses 5 6 (5)  
Income before income tax and social contribution tax 7 13 6  
Income and Social Contribution taxes (2) (2) (1)  
Net income (loss) for the year 5 11 5  
Comprehensive income (loss) for the year 5 11 5  
Retiro Baixo [member]        
Assets        
Current 23 30 10  
Cash and cash equivalents 14 19 1  
Non-current 366 377 443  
Total assets 389 407 453  
Liabilities        
Current 27 25 25  
Suppliers 3 1 6  
Non-current 104 118 132  
Equity 258 264 296  
Total liabilities 389 407 453  
Statement of income        
Net sales revenue 67 62 53  
Cost of sales (34) (29) (40)  
Depreciation and amortization (10) (9) (9)  
GROSS PROFIT 33 33 13  
General and administrative expenses     (11)  
Net Finance income (expenses)     (13)  
Finance income 3 2 1  
Finance expenses 11 15 (14)  
Income before income tax and social contribution tax 25 20 (11)  
Income and Social Contribution taxes (3) (3) 1  
Net income (loss) for the year 22 17 (10)  
Comprehensive income (loss) for the year 22 17 (10)  
Renova [member]        
Assets        
Current 32 136 551  
Cash and cash equivalents   36 66  
Non-current 1,679 5,765 8,425  
Total assets 1,711 5,901 8,976  
Liabilities        
Current 395 3,347 1,497  
Suppliers 25 547 570  
Non-current 536 598 1,898  
Equity 780 1,956 5,581  
Total liabilities 1,711 5,901 8,976  
Statement of income        
Net sales revenue   484 458  
Cost of sales (5) (454) (5)  
Depreciation and amortization (5) (93) (4)  
GROSS PROFIT (5) 30 453  
General and administrative expenses   (41)    
Net Finance income (expenses)     (355)  
Impairment of PP&E   (281)    
Finance income 4 16 41  
Finance expenses 1,260 424 (396)  
Income before income tax and social contribution tax (1,261) (1,155) 98  
Income and Social Contribution taxes 121 54 (191)  
Net income (loss) for the year (1,140) (1,101) (93)  
Comprehensive income (loss) effects (99) 99 54  
Comprehensive income (loss) for the year (1,239) (1,002) (39)  
Parajuru [Member]        
Assets        
Current 41 38 21  
Cash and cash equivalents 35 18 12  
Non-current 121 128 192  
Total assets 162 166 213  
Liabilities        
Current 26 19 18  
Suppliers 1 1    
Non-current 47 58 66  
Equity 89 89 129  
Total liabilities 162 166 213  
Statement of income        
Net sales revenue 21 27 31  
Cost of sales (16) (17) (16)  
Depreciation and amortization (10) (10) (10)  
GROSS PROFIT 5 10 15  
General and administrative expenses (2) (1) (5)  
Net Finance income (expenses)     (5)  
Finance income 3 3 2  
Finance expenses 6 7 (7)  
Income before income tax and social contribution tax   5 5  
Income and Social Contribution taxes   (2) (1)  
Net income (loss) for the year   3 4  
Comprehensive income (loss) for the year   3 4  
Morgado [Member]        
Assets        
Current 11 24 31  
Cash and cash equivalents 7 17 12  
Non-current 136 142 209  
Total assets 147 166 240  
Liabilities        
Current 90 27 28  
Suppliers 2 1    
Non-current 3 74 85  
Equity 54 65 127  
Total liabilities 147 166 240  
Statement of income        
Net sales revenue 14 22 34  
Cost of sales (17) (17) (18)  
Depreciation and amortization (10) (10) (10)  
GROSS PROFIT (3) 5 16  
General and administrative expenses (1) (1) (6)  
Net Finance income (expenses)     (8)  
Finance income 2 3 2  
Finance expenses 8 10 (10)  
Income before income tax and social contribution tax (10) (3) 2  
Income and Social Contribution taxes (1) 1 (1)  
Net income (loss) for the year (11) (2) 1  
Comprehensive income (loss) for the year (11) (2) 1  
Voltado Rio [Member]        
Assets        
Current 16 37 46  
Cash and cash equivalents 5 27 20  
Non-current 233 245 290  
Total assets 249 282 336  
Liabilities        
Current 126 37 36  
Suppliers 1 1 1  
Non-current 7 108 126  
Equity 116 137 174  
Total liabilities 249 282 336  
Statement of income        
Net sales revenue 22 29 47  
Cost of sales (28) (27) (28)  
Depreciation and amortization (17) (17) (17)  
GROSS PROFIT (6) 2 19  
General and administrative expenses (3) (2) (2)  
Net Finance income (expenses)     (11)  
Finance income 3 5 3  
Finance expenses 12 15 (14)  
Income before income tax and social contribution tax (18) (10) 6  
Income and Social Contribution taxes (3) 3 (2)  
Net income (loss) for the year (21) (7) 4  
Comprehensive income (loss) for the year R$ (21) (7) 4  
Parati [member]        
Assets        
Current     59  
Cash and cash equivalents     46  
Non-current     1,408  
Total assets     1,467  
Liabilities        
Current     36  
Equity     1,431  
Total liabilities     1,467  
Statement of income        
Net Finance income (expenses)     11  
Finance income     48  
Finance expenses     37  
Income before income tax and social contribution tax     11  
Net income (loss) for the year     11  
Comprehensive income (loss) effects     1  
Comprehensive income (loss) for the year     12  
Transchile Charrua Transmision SA [Member]        
Assets        
Current     39  
Cash and cash equivalents     36  
Non-current     299  
Total assets     338  
Liabilities        
Current     21  
Loans and financings - Current     10  
Non-current     96  
Equity     221  
Total liabilities     338  
Statement of income        
Net sales revenue     28  
Cost of sales     (10)  
Depreciation and amortization     (9)  
GROSS PROFIT     18  
Net Finance income (expenses)     (6)  
Finance expenses     6  
Income before income tax and social contribution tax     12  
Net income (loss) for the year     12  
Comprehensive income (loss) for the year     12  
Alianca Norte [member]        
Assets        
Current     1  
Cash and cash equivalents     1  
Non-current     726  
Total assets     727  
Liabilities        
Non-current     4  
Equity     723  
Total liabilities     727  
Statement of income        
Net Finance income (expenses)     (27)  
Finance expenses     27  
Income before income tax and social contribution tax     (27)  
Net income (loss) for the year     (27)  
Comprehensive income (loss) for the year     (27)  
Cachoeirao [Member]        
Assets        
Current   43 28  
Cash and cash equivalents   40 23  
Non-current   86 89  
Total assets   129 117  
Liabilities        
Current   9 10  
Suppliers   2 2  
Non-current   17 24  
Equity   103 83  
Total liabilities   129 117  
Statement of income        
Net sales revenue   34 30  
Cost of sales   (10) (14)  
Depreciation and amortization   (3) (3)  
GROSS PROFIT   24 16  
Net Finance income (expenses)     (1)  
Finance income   4 2  
Finance expenses   3 3  
Income before income tax and social contribution tax   25 15  
Income and Social Contribution taxes   (2) (2)  
Net income (loss) for the year   23 13  
Comprehensive income (loss) for the year   R$ 23 R$ 13