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16 Investments (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Jan. 02, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of joint ventures [line items]          
ASSETS   R$ 38,312,550 R$ 35,930,100    
Current assets   7,909,196 6,677,846    
Cash and cash equivalents   2,941,727 1,948,409 R$ 1,040,075 R$ 982,073
Noncurrent assets   30,403,354 29,252,254    
Current liabilities   5,345,621 6,695,114    
Noncurrent liabilities   15,368,717 12,898,772    
Equity   17,598,212 16,336,214 15,510,503 R$ 14,978,142
STATEMENT OF INCOME          
Net operating income   16,244,274 14,934,780 14,024,573  
Operating costs and expenses   (11,760,176) (11,501,688) (10,665,890)  
Equity in income of subsidiaries   106,757 135,888 101,739  
Income tax and social contribution   639,326 511,993 274,686  
Net income (loss) R$ 2,070,551 2,062,869 1,444,004 1,118,255  
Total comprehensive income   1,939,685 1,405,644 1,086,917  
Voltalia [Member]          
Disclosure of joint ventures [line items]          
ASSETS   226,898 227,867 155,272  
Current assets   3,664 2,344 2,141  
Cash and cash equivalents   1,494 205 3  
Other current assets   2,170 2,139 2,138  
Noncurrent assets   223,234 225,523 153,131  
LIABILITIES   226,898 227,867 155,272  
Current liabilities   2,206 2,216 2,214  
Financial liabilities    
Other current liabilities   2,206 2,216 2,214  
Noncurrent liabilities    
Financial liabilities    
Other noncurrent liabilities    
Equity   224,692 225,651 153,058  
STATEMENT OF INCOME          
Net operating income    
Operating costs and expenses   (111) (103) (113)  
Financial results   146 (170) 9  
Equity in income of subsidiaries   (7,080) (7,815) (1,048)  
Income tax and social contribution   (5)  
Net income (loss)   (7,050) (8,088) (1,152)  
Other comprehensive income    
Total comprehensive income   R$ (7,050) R$ (8,088) R$ (1,152)  
Investment interest - %   4900.00% 49.00% 49.00%  
Investment book value   R$ 110,099 R$ 110,568 R$ 74,998  
Caiua [Member]          
Disclosure of joint ventures [line items]          
ASSETS   271,409 261,951 230,743  
Current assets   30,472 26,471 22,895  
Cash and cash equivalents   3,968 1,128 1,626  
Other current assets   26,504 25,343 21,269  
Noncurrent assets   240,937 235,480 207,848  
LIABILITIES   271,409 261,951 230,743  
Current liabilities   28,892 24,955 23,608  
Financial liabilities   7,584 7,615 7,427  
Other current liabilities   21,308 17,340 16,181  
Noncurrent liabilities   82,699 84,672 92,774  
Financial liabilities   49,958 57,028 64,081  
Other noncurrent liabilities   32,741 27,644 28,693  
Equity   159,818 152,324 114,361  
STATEMENT OF INCOME          
Net operating income   25,180 25,129 (2,904)  
Operating costs and expenses   (5,481) (4,785) (5,194)  
Financial results   (4,557) (5,017) (6,017)  
Equity in income of subsidiaries    
Income tax and social contribution   (5,348) (5,053) 5,908  
Net income (loss)   9,794 10,274 (8,207)  
Other comprehensive income    
Total comprehensive income   R$ 9,794 R$ 10,274 R$ (8,207)  
Investment interest - %   4900.00% 49.00% 49.00%  
Investment book value   R$ 78,312 R$ 74,639 R$ 56,037  
Integracao Maranhense [Member]          
Disclosure of joint ventures [line items]          
ASSETS   486,305 465,801 466,783  
Current assets   59,466 47,347 44,594  
Cash and cash equivalents   6,570 1 2,224  
Other current assets   52,896 47,346 42,370  
Noncurrent assets   426,839 418,454 422,189  
LIABILITIES   486,305 465,801 466,783  
Current liabilities   77,116 73,856 71,563  
Financial liabilities   13,468 13,228 13,240  
Other current liabilities   63,648 60,628 58,323  
Noncurrent liabilities   126,095 127,284 163,790  
Financial liabilities   78,350 91,342 103,755  
Other noncurrent liabilities   47,745 35,942 60,035  
Equity   283,094 264,661 231,430  
STATEMENT OF INCOME          
Net operating income   44,264 42,379 (14,460)  
Operating costs and expenses   (5,672) (7,732) (4,245)  
Financial results   (6,594) (7,817) (9,070)  
Equity in income of subsidiaries    
Income tax and social contribution   (8,904) (7,974) 9,709  
Net income (loss)   23,094 18,856 (18,066)  
Other comprehensive income    
Total comprehensive income   R$ 23,094 R$ 18,856 R$ (18,066)  
Investment interest - %   4900.00% 49.00% 49.00%  
Investment book value   R$ 138,716 R$ 129,684 R$ 113,401  
Matrincha [Member]          
Disclosure of joint ventures [line items]          
ASSETS   2,295,925 2,199,434 2,774,973  
Current assets   301,722 326,557 297,331  
Cash and cash equivalents   85,293 116,634 116,256  
Other current assets   216,429 209,923 181,075  
Noncurrent assets   1,994,203 1,872,877 2,477,642  
LIABILITIES   2,295,925 2,199,434 2,774,973  
Current liabilities   166,430 137,627 140,515  
Financial liabilities   82,665 70,192 48,686  
Other current liabilities   83,765 67,435 91,829  
Noncurrent liabilities   677,398 687,897 928,706  
Financial liabilities   624,779 683,316 712,198  
Other noncurrent liabilities   52,619 4,581 216,508  
Equity   1,452,097 1,373,910 1,705,752  
STATEMENT OF INCOME          
Net operating income   250,188 272,103 403,891  
Operating costs and expenses   (70,886) (47,771) (183,660)  
Financial results   (59,794) (61,910) (47,331)  
Equity in income of subsidiaries    
Income tax and social contribution   (33,103) (59,544) (55,808)  
Net income (loss)   86,405 102,878 117,092  
Other comprehensive income    
Total comprehensive income   R$ 86,405 R$ 102,878 R$ 117,092  
Investment interest - %   4900.00% 49.00% 49.00%  
Investment book value   R$ 711,527 R$ 673,216 R$ 835,819  
Guaraciaba [Member]          
Disclosure of joint ventures [line items]          
ASSETS   1,318,517 1,295,670 1,428,247  
Current assets   150,875 229,693 139,920  
Cash and cash equivalents   44,805 136,191 34,364  
Other current assets   106,070 93,502 105,556  
Noncurrent assets   1,167,642 1,065,977 1,288,327  
LIABILITIES   1,318,517 1,295,670 1,428,247  
Current liabilities   84,863 79,701 71,818  
Financial liabilities   33,102 27,950 32,627  
Other current liabilities   51,761 51,751 39,191  
Noncurrent liabilities   545,742 487,520 502,713  
Financial liabilities   461,353 482,125 388,806  
Other noncurrent liabilities   84,389 5,395 113,907  
Equity   687,912 728,449 853,716  
STATEMENT OF INCOME          
Net operating income   111,912 181,665 208,444  
Operating costs and expenses   (29,067) (27,273) (93,369)  
Financial results   (42,548) (35,036) (36,981)  
Equity in income of subsidiaries    
Income tax and social contribution   (2,926) (47,273) (26,303)  
Net income (loss)   37,371 72,083 51,791  
Other comprehensive income    
Total comprehensive income   R$ 37,371 R$ 72,083 R$ 51,791  
Investment interest - %   4900.00% 49.00% 49.00%  
Investment book value   R$ 337,077 R$ 356,941 R$ 418,320  
Paranaiba [Member]          
Disclosure of joint ventures [line items]          
ASSETS   1,625,008 1,574,846 1,698,213  
Current assets   178,558 165,072 233,065  
Cash and cash equivalents   20,338 13,931 29,066  
Other current assets   158,220 151,141 203,999  
Noncurrent assets   1,446,450 1,409,774 1,465,148  
LIABILITIES   1,625,008 1,574,846 1,698,213  
Current liabilities   104,065 104,599 124,764  
Financial liabilities   60,399 55,968 53,317  
Other current liabilities   43,666 48,631 71,447  
Noncurrent liabilities   810,847 814,798 911,107  
Financial liabilities   580,451 612,854 638,779  
Other noncurrent liabilities   230,396 201,944 272,328  
Equity   710,096 655,449 662,342  
STATEMENT OF INCOME          
Net operating income   198,573 (14,331) 320,302  
Operating costs and expenses   (30,560) (23,244) (150,984)  
Financial results   (54,154) (57,977) (59,132)  
Equity in income of subsidiaries    
Income tax and social contribution   (47,024) 28,163 (40,717)  
Net income (loss)   66,835 (67,389) 69,469  
Other comprehensive income    
Total comprehensive income   R$ 66,835 R$ (67,389) R$ 69,469  
Investment interest - %   2450.00% 24.50% 24.50%  
Investment book value   R$ 173,973 R$ 160,584 R$ 162,273  
Mata de Santa Genebra [Member]          
Disclosure of joint ventures [line items]          
ASSETS   2,482,326 2,365,160 1,722,063  
Current assets   268,381 202,253 107,568  
Cash and cash equivalents   48,395 19,568 96,244  
Other current assets   219,986 182,685 11,324  
Noncurrent assets   2,213,945 2,162,907 1,614,495  
LIABILITIES   2,482,326 2,365,160 1,722,063  
Current liabilities   129,810 124,606 12,630  
Financial liabilities   93,643 33,964  
Other current liabilities   36,167 90,642 12,630  
Noncurrent liabilities   1,208,089 1,273,962 792,519  
Financial liabilities   1,208,089 934,650 703,897  
Other noncurrent liabilities   339,312 88,622  
Equity   1,144,427 966,592 916,914  
STATEMENT OF INCOME          
Net operating income   357,522 514,591 588,123  
Operating costs and expenses   (384,228) (462,839) (434,779)  
Financial results   (99,186) (59,507) (94,512)  
Equity in income of subsidiaries    
Income tax and social contribution   42,627 2,685 (19,955)  
Net income (loss)   (83,265) (5,070) 38,877  
Other comprehensive income    
Total comprehensive income   R$ (83,265) R$ (5,070) R$ 38,877  
Investment interest - %   5010.00% 50.10% 50.10%  
Investment book value   R$ 573,357 R$ 484,262 R$ 459,374  
Cantareira [Member]          
Disclosure of joint ventures [line items]          
ASSETS   1,496,577 1,443,693 952,670  
Current assets   182,971 161,328 6,046  
Cash and cash equivalents   60,252 301 5,169  
Other current assets   122,719 161,027 877  
Noncurrent assets   1,313,606 1,282,365 946,624  
LIABILITIES   1,496,577 1,443,693 952,670  
Current liabilities   72,907 60,964 9,706  
Financial liabilities   48,619 46,329  
Other current liabilities   24,288 14,635 9,706  
Noncurrent liabilities   733,326 734,724 534,764  
Financial liabilities   507,775 532,179 439,192  
Other noncurrent liabilities   225,551 202,545 95,572  
Equity   690,344 648,005 408,200  
STATEMENT OF INCOME          
Net operating income   138,259 195,441 392,766  
Operating costs and expenses   (5,360) (60,529) (347,771)  
Financial results   (46,190) (58,402) (35,207)  
Equity in income of subsidiaries    
Income tax and social contribution   (29,498) (26,379) (1,871)  
Net income (loss)   57,211 50,131 7,917  
Other comprehensive income    
Total comprehensive income   R$ 57,211 R$ 50,131 R$ 7,917  
Investment interest - %   4900.00% 49.00% 49.00%  
Investment book value   R$ 338,268 R$ 317,523 R$ 200,018  
Transmissora Sul Brasileira [Member]          
Disclosure of joint ventures [line items]          
ASSETS       659,464  
Current assets       56,604  
Cash and cash equivalents       25,547  
Other current assets       31,057  
Noncurrent assets       602,860  
LIABILITIES       659,464  
Current liabilities       220,845  
Financial liabilities       212,618  
Other current liabilities       8,227  
Noncurrent liabilities       116,818  
Financial liabilities       106,174  
Other noncurrent liabilities       10,644  
Equity       321,801  
STATEMENT OF INCOME          
Net operating income       53,374  
Operating costs and expenses       (63,752)  
Financial results       (26,994)  
Equity in income of subsidiaries        
Income tax and social contribution       12,330  
Net income (loss)       (25,042)  
Other comprehensive income        
Total comprehensive income       R$ (25,042)  
Investment interest - %       20.00%  
Investment book value       R$ 64,360