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Investments (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]        
ASSETS R$ 49,703,700 R$ 49,537,535    
Current assets 9,327,249 11,189,872    
Cash and cash equivalents 2,678,457 3,472,845 R$ 3,222,768  
Noncurrent assets 40,376,451 38,347,663    
Current liabilities 7,156,597 7,979,993    
Noncurrent liabilities 21,415,878 19,382,307    
Equity 21,131,225 22,175,235 20,250,518 R$ 17,598,212
Operating expense (16,928,407) (19,119,637) (13,347,822)  
Equity in income of subsidiaries 478,577 366,314 193,547  
Income tax and social contribution (199,122) 1,259,632 1,285,365  
Net income 1,149,321 5,048,602 3,909,750  
Comprehensive income 1,359,308 5,201,347 3,730,595  
Voltalia [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 238,907 224,632    
Current assets 10,883 3,711    
Cash and cash equivalents 10,797 3,667    
Other current assets 86 44    
Noncurrent assets 228,024 220,921    
LIABILITIES 238,907 224,632    
Current liabilities 2,220 2,206    
Financial liabilities (0)    
Other current liabilities 2,220 2,206    
Noncurrent liabilities (0)    
Financial liabilities (0)    
Other noncurrent liabilities (0)    
Equity 236,687 222,426    
Operating expense (78) (64)    
Financial results 1,291 162 32  
Equity in income of subsidiaries 2,502 2,506 (4,893)  
Income tax and social contribution (258) (17) (0)  
Net income 3,457 2,587 (4,927)  
Comprehensive income R$ 3,457 R$ 2,587 (4,927)  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 115,976 R$ 108,990    
Operating costs and expenses     (66)  
Caiua [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 327,819 284,870    
Current assets 38,421 30,304    
Cash and cash equivalents 13,440 6,117    
Other current assets 24,981 24,187    
Noncurrent assets 289,398 254,566    
LIABILITIES 327,819 284,870    
Current liabilities 22,569 14,562    
Financial liabilities 7,273 7,386    
Other current liabilities 15,296 7,176    
Noncurrent liabilities 49,542 51,986    
Financial liabilities 28,705 35,606    
Other noncurrent liabilities 20,837 16,380    
Equity 255,708 218,322    
Net operating income 62,864 43,128 17,927  
Operating expense (5,876) (5,609)    
Financial results (1,605) (2,348) (3,389)  
Equity in income of subsidiaries      
Income tax and social contribution (6,802) (7,078) 1,752  
Net income 48,581 28,093 (18,294)  
Comprehensive income R$ 48,581 R$ 28,093 (18,294)  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 125,297 R$ 106,979    
Operating costs and expenses     (34,584)  
Integracao Maranhense [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 588,279 515,495    
Current assets 78,790 65,219    
Cash and cash equivalents 28,997 16,501    
Other current assets 49,793 48,718    
Noncurrent assets 509,489 450,276    
LIABILITIES 588,279 515,495    
Current liabilities 59,771 53,132    
Financial liabilities 12,774 13,169    
Other current liabilities 46,997 39,963    
Noncurrent liabilities 135,645 122,438    
Financial liabilities 40,415 52,653    
Other noncurrent liabilities 95,230 69,785    
Equity 392,863 339,925    
Net operating income 100,482 71,868 31,418  
Operating expense (4,022) (10,508)    
Financial results (2,286) (3,954) (5,229)  
Equity in income of subsidiaries      
Income tax and social contribution (27,185) (16,072) (9,991)  
Net income 66,989 41,334 27,904  
Comprehensive income R$ 66,989 R$ 41,334 27,904  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 192,502 R$ 166,564    
Operating costs and expenses     11,706  
Matrincha [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 2,935,068 2,610,094    
Current assets 427,118 367,428    
Cash and cash equivalents 136,878 96,346    
Other current assets 290,240 271,082    
Noncurrent assets 2,507,950 2,242,666    
LIABILITIES 2,935,068 2,610,094    
Current liabilities 225,502 126,211    
Financial liabilities 130,033 91,811    
Other current liabilities 95,469 34,400    
Noncurrent liabilities 808,485 827,205    
Financial liabilities 578,340 685,525    
Other noncurrent liabilities 230,145 141,680    
Equity 1,901,081 1,656,678    
Net operating income 518,428 396,622 328,171  
Operating expense (33,073) (24,341)    
Financial results (59,543) (83,280) (71,164)  
Equity in income of subsidiaries      
Income tax and social contribution (94,589) (91,830) (30,178)  
Net income 331,223 197,171 66,034  
Comprehensive income R$ 331,223 R$ 197,171 66,034  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 931,528 R$ 811,773    
Operating costs and expenses     (160,795)  
Guaraciaba [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 1,568,964 1,413,231    
Current assets 211,094 194,283    
Cash and cash equivalents 56,436 70,543    
Other current assets 154,658 123,740    
Noncurrent assets 1,357,870 1,218,948    
LIABILITIES 1,568,964 1,413,231    
Current liabilities 154,404 101,042    
Financial liabilities 42,260 34,529    
Other current liabilities 112,144 66,513    
Noncurrent liabilities 461,297 480,320    
Financial liabilities 397,181 428,314    
Other noncurrent liabilities 64,116 52,006    
Equity 953,263 831,869    
Net operating income 266,855 229,117 109,978  
Operating expense (40,926) (7,185)    
Financial results (37,598) (44,131) (38,883)  
Equity in income of subsidiaries      
Income tax and social contribution (20,473) (60,617) (22,084)  
Net income 167,858 117,184 40,694  
Comprehensive income R$ 167,858 R$ 117,184 40,694  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 467,099 R$ 407,617    
Operating costs and expenses     (8,317)  
Paranaiba [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 1,921,848 1,829,340    
Current assets 223,010 193,190    
Cash and cash equivalents 56,518 32,665    
Other current assets 166,492 160,525    
Noncurrent assets 1,698,838 1,636,150    
LIABILITIES 1,921,848 1,829,340    
Current liabilities 125,681 85,964    
Financial liabilities 59,606 51,453    
Other current liabilities 66,075 34,511    
Noncurrent liabilities 718,700 817,159    
Financial liabilities 475,804 522,289    
Other noncurrent liabilities 242,896 294,870    
Equity 1,077,467 926,217    
Net operating income 231,960 285,483 478,147  
Operating expense (20,181) (17,537)    
Financial results (48,430) (62,138) (48,184)  
Equity in income of subsidiaries      
Income tax and social contribution 31,030 (62,638) (125,646)  
Net income 194,379 143,170 285,516  
Comprehensive income R$ 194,379 R$ 143,170 285,516  
Investment interest - % 24.50% 24.50%    
Investment book value R$ 263,979 R$ 226,924    
Operating costs and expenses     (18,801)  
Mata De Santa Genebra [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 3,587,501 3,203,892    
Current assets 539,668 681,494    
Cash and cash equivalents 32,903 387,027    
Other current assets 506,765 294,467    
Noncurrent assets 3,047,833 2,522,398    
LIABILITIES 3,587,501 3,203,892    
Current liabilities 113,772 123,884    
Financial liabilities 70,775 45,898    
Other current liabilities 42,997 77,986    
Noncurrent liabilities 2,091,971 1,660,867    
Financial liabilities 1,668,794 1,630,306    
Other noncurrent liabilities 423,177 30,561    
Equity 1,381,758 1,419,141    
Net operating income 415,526 426,573 364,070  
Operating expense (68,472) (72,970)    
Financial results (177,322) (162,110) (91,947)  
Equity in income of subsidiaries      
Income tax and social contribution (57,676) (65,399) (49,560)  
Net income 112,056 126,094 96,994  
Comprehensive income R$ 112,056 R$ 126,094 96,994  
Investment interest - % 50.10% 50.10%    
Investment book value R$ 692,260 R$ 710,991    
Operating costs and expenses     (125,569)  
Cantareira [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 1,805,583 1,715,776    
Current assets 226,945 196,424    
Cash and cash equivalents 73,866 52,354    
Other current assets 153,079 144,070    
Noncurrent assets 1,578,638 1,519,352    
LIABILITIES 1,805,583 1,715,776    
Current liabilities 92,290 78,982    
Financial liabilities 59,850 52,397    
Other current liabilities 32,440 26,585    
Noncurrent liabilities 747,233 744,285    
Financial liabilities 423,563 456,180    
Other noncurrent liabilities 323,670 288,105    
Equity 966,060 892,509    
Net operating income 188,348 233,888 196,039  
Operating expense (10,885) (24,727)    
Financial results (37,815) (43,794) (40,630)  
Equity in income of subsidiaries      
Income tax and social contribution (47,212) (56,201) (44,805)  
Net income 92,436 109,166 87,071  
Comprehensive income R$ 92,436 R$ 109,166 87,071  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 473,369 R$ 437,330    
Operating costs and expenses     R$ (23,533)