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16 Investments (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of joint ventures [line items]        
ASSETS R$ 46,784,664      
Current assets 11,407,431      
Cash and cash equivalents 3,222,768 R$ 2,941,727    
Noncurrent assets 35,377,233      
Current liabilities 9,654,392      
Noncurrent liabilities 16,879,754      
Equity 20,250,518 17,598,212 R$ 16,336,214 R$ 15,345,579
STATEMENT OF INCOME        
Net operating income 18,633,249      
Operating costs and expenses (13,347,822)      
Equity in income of subsidiaries 193,547      
Income tax and social contribution 1,285,365      
Net income 3,909,750      
Total comprehensive income 3,730,595 1,939,685 1,405,644  
Voltalia [member]        
Disclosure of joint ventures [line items]        
ASSETS 222,038 226,898 227,867  
Current assets 3,623 3,664 2,344  
Cash and cash equivalents 3,579 1,494 205  
Other current assets 44 2,170 2,139  
Noncurrent assets 218,415 223,234 225,523  
LIABILITIES 222,038 226,898 227,867  
Current liabilities 2,199 2,206 2,216  
Financial liabilities    
Other current liabilities 2,199 2,206 2,216  
Noncurrent liabilities    
Financial liabilities    
Other noncurrent liabilities    
Equity 219,839 224,692 225,651  
STATEMENT OF INCOME        
Operating costs and expenses (66) (111) (103)  
Financial results 32 146 (170)  
Equity in income of subsidiaries (4,893) (7,080) (7,815)  
Income tax and social contribution (5)    
Net income (4,927) (7,050) (8,088)  
Other comprehensive income    
Total comprehensive income R$ (4,927) R$ (7,050) R$ (8,088)  
Investment interest - % 49.00% 49.00% 49.00%  
Investment book value R$ 107,721 R$ 110,099 R$ 110,568  
Caiua [member]        
Disclosure of joint ventures [line items]        
ASSETS 267,425 271,409 261,951  
Current assets 31,048 30,472 26,471  
Cash and cash equivalents 6,871 3,968 1,128  
Other current assets 24,177 26,504 25,343  
Noncurrent assets 236,377 240,937 235,480  
LIABILITIES 267,425 271,409 261,951  
Current liabilities 18,995 28,892 24,955  
Financial liabilities 7,392 7,584 7,615  
Other current liabilities 11,603 21,308 17,340  
Noncurrent liabilities 53,816 82,699 84,672  
Financial liabilities 42,864 49,958 57,028  
Other noncurrent liabilities 10,952 32,741 27,644  
Equity 194,614 159,818 152,324  
STATEMENT OF INCOME        
Net operating income 17,927 25,180 25,129  
Operating costs and expenses (34,584) (5,481) (4,785)  
Financial results (3,389) (4,557) (5,017)  
Equity in income of subsidiaries      
Income tax and social contribution 1,752 (5,348) (5,053)  
Net income (18,294) 9,794 10,274  
Other comprehensive income    
Total comprehensive income R$ (18,294) R$ 9,794 R$ 10,274  
Investment interest - % 49.00% 49.00% 49.00%  
Investment book value R$ 95,362 R$ 78,312 R$ 74,639  
Integracao maranhense [member]        
Disclosure of joint ventures [line items]        
ASSETS 475,734 486,305 465,801  
Current assets 59,709 59,466 47,347  
Cash and cash equivalents 12,696 6,570 1  
Other current assets 47,013 52,896 47,346  
Noncurrent assets 416,025 426,839 418,454  
LIABILITIES 475,734 486,305 465,801  
Current liabilities 51,926 77,116 73,856  
Financial liabilities 13,180 13,468 13,228  
Other current liabilities 38,746 63,648 60,628  
Noncurrent liabilities 120,579 126,095 127,284  
Financial liabilities 65,624 78,350 91,342  
Other noncurrent liabilities 54,955 47,745 35,942  
Equity 303,229 283,094 264,661  
STATEMENT OF INCOME        
Net operating income 31,418 44,264 42,379  
Operating costs and expenses 11,706 (5,672) (7,732)  
Financial results (5,229) (6,594) (7,817)  
Equity in income of subsidiaries      
Income tax and social contribution (9,991) (8,904) (7,974)  
Net income 27,904 23,094 18,856  
Other comprehensive income    
Total comprehensive income R$ 27,904 R$ 23,094 R$ 18,856  
Investment interest - % 49.00% 49.00% 49.00%  
Investment book value R$ 148,581 R$ 138,716 R$ 129,684  
Matrincha [member]        
Disclosure of joint ventures [line items]        
ASSETS 2,357,028 2,295,925 2,199,434  
Current assets 261,168 301,722 326,557  
Cash and cash equivalents 46,198 85,293 116,634  
Other current assets 214,970 216,429 209,923  
Noncurrent assets 2,095,860 1,994,203 1,872,877  
LIABILITIES 2,357,028 2,295,925 2,199,434  
Current liabilities 192,512 166,430 137,627  
Financial liabilities 80,141 82,665 70,192  
Other current liabilities 112,371 83,765 67,435  
Noncurrent liabilities 665,528 677,398 687,897  
Financial liabilities 612,413 624,779 683,316  
Other noncurrent liabilities 53,115 52,619 4,581  
Equity 1,498,988 1,452,097 1,373,910  
STATEMENT OF INCOME        
Net operating income 328,171 250,188 272,103  
Operating costs and expenses (160,795) (70,886) (47,771)  
Financial results (71,164) (59,794) (61,910)  
Equity in income of subsidiaries      
Income tax and social contribution (30,178) (33,103) (59,544)  
Net income 66,034 86,405 102,878  
Other comprehensive income    
Total comprehensive income R$ 66,034 R$ 86,405 R$ 102,878  
Investment interest - % 49.00% 49.00% 49.00%  
Investment book value R$ 734,503 R$ 711,527 R$ 673,216  
Guaraciaba [member]        
Disclosure of joint ventures [line items]        
ASSETS 1,269,378 1,318,517 1,295,670  
Current assets 165,063 150,875 229,693  
Cash and cash equivalents 25,565 44,805 136,191  
Other current assets 139,498 106,070 93,502  
Noncurrent assets 1,104,315 1,167,642 1,065,977  
LIABILITIES 1,269,378 1,318,517 1,295,670  
Current liabilities 86,163 84,863 79,701  
Financial liabilities 28,741 33,102 27,950  
Other current liabilities 57,422 51,761 51,751  
Noncurrent liabilities 446,133 545,742 487,520  
Financial liabilities 446,801 461,353 482,125  
Other noncurrent liabilities (668) 84,389 5,395  
Equity 737,082 687,912 728,449  
STATEMENT OF INCOME        
Net operating income 109,978 111,912 181,665  
Operating costs and expenses (8,317) (29,067) (27,273)  
Financial results (38,883) (42,548) (35,036)  
Equity in income of subsidiaries      
Income tax and social contribution (22,084) (2,926) (47,273)  
Net income 40,694 37,371 72,083  
Other comprehensive income  
Total comprehensive income R$ 40,694 R$ 37,371 R$ 72,083  
Investment interest - % 49.00% 49.00% 49.00%  
Investment book value R$ 361,170 R$ 337,077 R$ 356,941  
Paranaiba [member]        
Disclosure of joint ventures [line items]        
ASSETS 1,687,613 1,625,008 1,574,846  
Current assets 179,229 178,558 165,072  
Cash and cash equivalents 20,820 20,338 13,931  
Other current assets 158,409 158,220 151,141  
Noncurrent assets 1,508,384 1,446,450 1,409,774  
LIABILITIES 1,687,613 1,625,008 1,574,846  
Current liabilities 78,981 104,065 104,599  
Financial liabilities 62,143 60,399 55,968  
Other current liabilities 16,838 43,666 48,631  
Noncurrent liabilities 777,279 810,847 814,798  
Financial liabilities 545,200 580,451 612,854  
Other noncurrent liabilities 232,079 230,396 201,944  
Equity 831,353 710,096 655,449  
STATEMENT OF INCOME        
Net operating income 478,147 198,573 (14,331)  
Operating costs and expenses 18,801 30,560 23,244  
Financial results (48,184) (54,154) (57,977)  
Equity in income of subsidiaries    
Income tax and social contribution (125,646) (47,024) 28,163  
Net income 285,516 66,835 (67,389)  
Other comprehensive income  
Total comprehensive income R$ 285,516 R$ 66,835 R$ (67,389)  
Investment interest - % 24.50% 24.50% 24.50%  
Investment book value R$ 203,681 R$ 173,973 R$ 160,584  
Mata de santa genebra [member]        
Disclosure of joint ventures [line items]        
ASSETS 2,712,737 2,482,326 2,365,160  
Current assets 340,382 268,381 202,253  
Cash and cash equivalents 61,171 48,395 19,568  
Other current assets 279,211 219,986 182,685  
Noncurrent assets 2,372,355 2,213,945 2,162,907  
LIABILITIES 2,712,737 2,482,326 2,365,160  
Current liabilities 158,350 129,810 124,606  
Financial liabilities 104,308 93,643 33,964  
Other current liabilities 54,042 36,167 90,642  
Noncurrent liabilities 1,234,165 1,208,089 1,273,962  
Financial liabilities 1,215,988 1,208,089 934,650  
Other noncurrent liabilities 18,177   339,312  
Equity 1,320,222 1,144,427 966,592  
STATEMENT OF INCOME        
Net operating income 364,070 357,522 514,591  
Operating costs and expenses (125,569) (384,228) 462,839  
Financial results (91,947) (99,186) (59,507)  
Equity in income of subsidiaries      
Income tax and social contribution (49,560) 42,627 2,685  
Net income 96,994 (83,265) (5,070)  
Other comprehensive income    
Total comprehensive income R$ 96,994 R$ (83,265) R$ (5,070)  
Investment interest - % 50.10% 50.10% 50.10%  
Investment book value R$ 661,430 R$ 573,357 R$ 484,262  
Cantareira [member]        
Disclosure of joint ventures [line items]        
ASSETS 1,567,577 1,496,577 1,443,693  
Current assets 165,816 182,971 161,328  
Cash and cash equivalents 34,435 60,252 301  
Other current assets 131,381 122,719 161,027  
Noncurrent assets 1,401,761 1,313,606 1,282,365  
LIABILITIES 1,567,577 1,496,577 1,443,693  
Current liabilities 63,206 72,907 60,964  
Financial liabilities 41,314 48,619 46,329  
Other current liabilities 21,892 24,288 14,635  
Noncurrent liabilities 770,317 733,326 734,724  
Financial liabilities 489,784 507,775 532,179  
Other noncurrent liabilities 280,533 225,551 202,545  
Equity 734,054 690,344 648,005  
STATEMENT OF INCOME        
Net operating income 196,039 138,259 195,441  
Operating costs and expenses (23,533) (5,360) 60,529  
Financial results (40,630) (46,190) (58,402)  
Equity in income of subsidiaries      
Income tax and social contribution (44,805) (29,498) (26,379)  
Net income 87,071 57,211 50,131  
Other comprehensive income    
Total comprehensive income R$ 87,071 R$ 57,211 R$ 50,131  
Investment interest - % 49.00% 49.00% 49.00%  
Investment book value R$ 359,686 R$ 338,268 R$ 317,523