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Investments (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]        
ASSETS R$ 55,819,074 R$ 49,703,700    
Current assets 13,715,730 9,327,249    
Cash and cash equivalents 5,634,623 2,678,457 R$ 3,472,845  
Other current assets 12,252,801 9,327,249    
Noncurrent assets 42,103,344 40,376,451    
LIABILITIES 55,819,074 49,703,700    
Current liabilities 9,309,433 7,156,597    
Other current liabilities 8,776,169 7,156,597    
Noncurrent liabilities 22,317,974 21,415,878    
Equity 24,191,667 21,131,225 22,175,235 R$ 20,250,518
Net operating revenue 21,479,468 20,535,341 20,976,216  
Operating costs and expenses (18,092,563) (17,254,583) (16,415,740)  
Equity in earnings of investees 307,809 478,577 366,314  
Income tax and social contribution 354,057 (281,099) 1,178,524  
Net income 2,327,168 1,149,321 5,048,602  
Total comprehensive income 2,072,843 1,359,308 5,201,347  
Voltalia [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 239,779 238,907    
Current assets 9,535 10,883    
Cash and cash equivalents 9,378 10,797    
Other current assets 157 86    
Noncurrent assets 230,244 228,024    
LIABILITIES 239,779 238,907    
Current liabilities 17 2,220    
Financial liabilities    
Other current liabilities 17 2,220    
Noncurrent liabilities    
Financial liabilities    
Other noncurrent liabilities    
Equity 239,762 236,687    
Net operating revenue  
Operating costs and expenses (83) (78) (64)  
Interest expenses  
Financial income and other financial expenses 1,236 1,291 162  
Equity in earnings of investees 2,220 2,502 2,506  
Income tax and social contribution (298) (258) (17)  
Net income 3,075 2,166 2,587  
Other comprehensive income  
Total comprehensive income R$ 3,075 R$ 2,166 2,587  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 117,484 R$ 115,976    
Caiua [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 335,003 327,819    
Current assets 42,176 38,421    
Cash and cash equivalents 13,592 13,440    
Other current assets 28,584 24,981    
Noncurrent assets 292,827 289,398    
LIABILITIES 335,003 327,819    
Current liabilities 18,076 22,569    
Financial liabilities 5,710 7,273    
Other current liabilities 12,366 15,296    
Noncurrent liabilities 45,349 49,542    
Financial liabilities 23,381 28,705    
Other noncurrent liabilities 21,968 20,837    
Equity 271,578 255,708    
Net operating revenue 36,562 62,864 43,128  
Operating costs and expenses (7,069) 5,876 (5,609)  
Interest expenses (2,817) (3,225) (2,963)  
Financial income and other financial expenses 2,437 1,620 615  
Equity in earnings of investees  
Income tax and social contribution (4,088) (6,802) (7,078)  
Net income 25,025 50,186 28,093  
Other comprehensive income  
Total comprehensive income R$ 25,025 R$ 50,186 28,093  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 133,074 R$ 125,297    
Integracao Maranhense [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 585,668 588,279    
Current assets 68,873 78,790    
Cash and cash equivalents 9,247 28,997    
Other current assets 59,626 49,793    
Noncurrent assets 516,795 509,489    
LIABILITIES 585,668 588,279    
Current liabilities 12,559 59,771    
Financial liabilities 8,047 12,774    
Other current liabilities 4,512 46,997    
Noncurrent liabilities 140,334 135,645    
Financial liabilities 32,919 40,415    
Other noncurrent liabilities 107,415 95,230    
Equity 432,775 392,863    
Net operating revenue 63,370 100,482 71,868  
Operating costs and expenses 1,051 (4,022) (10,508)  
Interest expenses (4,236) (4,914) (4,671)  
Financial income and other financial expenses 3,970 2,628 717  
Equity in earnings of investees  
Income tax and social contribution (14,735) (27,185) (16,072)  
Net income 49,420 69,275 41,334  
Other comprehensive income  
Total comprehensive income R$ 49,420 R$ 69,275 41,334  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 212,060 R$ 192,502    
Matrincha [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 2,984,765 2,935,068    
Current assets 432,126 427,118    
Cash and cash equivalents 129,197 136,878    
Other current assets 302,929 290,240    
Noncurrent assets 2,552,639 2,507,950    
LIABILITIES 2,984,765 2,935,068    
Current liabilities 172,783 225,502    
Financial liabilities 133,551 130,033    
Other current liabilities 39,232 95,469    
Noncurrent liabilities 781,369 808,485    
Financial liabilities 493,603 578,340    
Other noncurrent liabilities 287,766 230,145    
Equity 2,030,613 1,901,081    
Net operating revenue 313,948 518,428 396,622  
Operating costs and expenses 42,853 (33,073) (24,341)  
Interest expenses (70,612) (76,652) (87,628)  
Financial income and other financial expenses 22,390 17,109 4,348  
Equity in earnings of investees  
Income tax and social contribution (64,724) (94,589) (91,830)  
Net income 158,149 390,766 197,171  
Other comprehensive income  
Total comprehensive income R$ 158,149 R$ 390,766 197,171  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 994,999 R$ 931,528    
Guaraciaba [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 1,611,484 1,568,964    
Current assets 209,444 211,094    
Cash and cash equivalents 52,346 56,436    
Other current assets 157,098 154,658    
Noncurrent assets 1,402,040 1,357,870    
LIABILITIES 1,611,484 1,568,964    
Current liabilities 147,180 154,404    
Financial liabilities 46,632 42,260    
Other current liabilities 100,548 112,144    
Noncurrent liabilities 460,052 461,297    
Financial liabilities 360,398 397,181    
Other noncurrent liabilities 99,654 64,116    
Equity 1,004,252 953,263    
Net operating revenue 165,557 266,855 229,117  
Operating costs and expenses 25,321 (40,926) (7,185)  
Interest expenses (43,496) (45,487) (46,449)  
Financial income and other financial expenses 8,472 7,889 2,318  
Equity in earnings of investees  
Income tax and social contribution (42,209) (20,473) (60,617)  
Net income 63,003 205,456 117,184  
Other comprehensive income  
Total comprehensive income R$ 63,003 R$ 205,456 117,184  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 492,083 R$ 467,099    
Paranaiba [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 2,047,430 1,921,848    
Current assets 255,100 223,010    
Cash and cash equivalents 58,781 56,518    
Other current assets 196,319 166,492    
Noncurrent assets 1,792,330 1,698,838    
LIABILITIES 2,047,430 1,921,848    
Current liabilities 142,254 125,681    
Financial liabilities 71,258 59,606    
Other current liabilities 70,996 66,075    
Noncurrent liabilities 713,251 718,700    
Financial liabilities 416,535 475,804    
Other noncurrent liabilities 296,716 242,896    
Equity 1,191,925 1,077,467    
Net operating revenue 282,153 231,960 285,483  
Operating costs and expenses (19,808) (20,181) (17,537)  
Interest expenses (58,254) (55,971) (64,378)  
Financial income and other financial expenses 9,899 7,541 2,240  
Equity in earnings of investees  
Income tax and social contribution (65,954) 31,030 (62,638)  
Net income 148,036 242,809 143,170  
Other comprehensive income  
Total comprehensive income R$ 148,036 R$ 242,809 143,170  
Investment interest - % 24.50% 24.50%    
Investment book value R$ 292,022 R$ 263,979    
Mata De Santa Genebra [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 3,768,174 3,587,501    
Current assets 689,261 539,668    
Cash and cash equivalents 23,560 32,903    
Other current assets 665,701 506,765    
Noncurrent assets 3,078,913      
LIABILITIES 3,768,174 3,587,501    
Current liabilities 115,975 113,772    
Financial liabilities 77,365 70,775    
Other current liabilities 38,610 42,997    
Noncurrent liabilities 2,181,769 2,091,971    
Financial liabilities 1,685,717 1,668,794    
Other noncurrent liabilities 496,052 423,177    
Equity 1,470,430 1,381,758    
Net operating revenue 393,463 415,526 426,573  
Operating costs and expenses (64,658) (68,472) (72,970)  
Interest expenses (117,202) (117,725) (142,329)  
Financial income and other financial expenses (36,378) (59,597) (19,781)  
Equity in earnings of investees  
Income tax and social contribution (58,933) (57,676) (65,399)  
Net income 116,292 289,378 126,094  
Other comprehensive income  
Total comprehensive income R$ 116,292 R$ 289,378 126,094  
Investment interest - % 50.10% 50.10%    
Investment book value R$ 736,685 R$ 692,260    
Cantareira [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 1,799,642 1,805,583    
Current assets 182,210 226,945    
Cash and cash equivalents 23,092 73,866    
Other current assets 159,118 153,079    
Noncurrent assets 1,617,432 1,578,638    
LIABILITIES 1,799,642 1,805,583    
Current liabilities 82,109 92,290    
Financial liabilities 43,716 59,850    
Other current liabilities 38,393 32,440    
Noncurrent liabilities 761,795 747,233    
Financial liabilities 410,552 423,563    
Other noncurrent liabilities 351,243 323,670    
Equity 955,738 966,060    
Net operating revenue 177,852 188,348 233,888  
Operating costs and expenses (8,992) (10,885) (24,727)  
Interest expenses (39,969) (40,077) (45,262)  
Financial income and other financial expenses 8,354 2,262 1,468  
Equity in earnings of investees  
Income tax and social contribution (46,300) (47,212) (56,201)  
Net income 90,945 130,251 109,166  
Other comprehensive income  
Total comprehensive income R$ 90,945 R$ 130,251 R$ 109,166  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 468,311 R$ 473,369