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Investments (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Joint Ventures [Line Items]        
ASSETS R$ 57,384,156 R$ 55,819,074    
Current assets 13,041,808 13,715,730    
Cash and cash equivalents 4,161,939 5,634,623    
Other current assets 11,159,982 12,252,801    
Non-current assets 44,342,348 42,103,344    
LIABILITIES 57,384,156 55,819,074    
Current liabilities 10,342,380 9,309,433    
Other current liabilities 9,800,968 8,776,169    
Non-current liabilities 21,404,841 22,317,974    
Equity 25,636,935 24,191,667 R$ 21,131,225 R$ 22,175,235
Net operating revenue 22,651,036 21,479,468 20,535,341  
OPERATING COSTS AND EXPENSES (18,867,990) (18,092,563) (17,254,583)  
Equity in earnings of investees 281,202 307,809 478,577  
Income tax and social contribution 599,435 354,057 (281,099)  
Net income 2,799,370 2,327,168 1,149,321  
Total comprehensive income 3,038,932 2,072,843 1,359,308  
Voltalia [Member]        
Disclosure Of Joint Ventures [Line Items]        
ASSETS 237,464 239,779    
Current assets 9,567 9,535    
Cash and cash equivalents 9,142 9,378    
Other current assets 425 157    
Non-current assets 227,897 230,244    
LIABILITIES 237,464 239,779    
Current liabilities 273 17    
Current financial liabilities 0 0    
Other current liabilities 273 17    
Non-current liabilities 0 0    
Financial liabilities 0 0    
Other non-current liabilities 0 0    
Equity 237,191 239,762    
Net operating revenue 0 0 0  
OPERATING COSTS AND EXPENSES (94) (83) (78)  
Interest expenses 0 0 0  
Financial income and other financial expenses 964 1,236 1,291  
Equity in earnings of investees (3,273) 2,220 2,502  
Income tax and social contribution (266) (298) (258)  
Net income (2,669) 3,075 3,457  
Other comprehensive income 0 0 0  
Total comprehensive income R$ (2,669) R$ 3,075 3,457  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 116,225 R$ 117,484    
Caiua [Member]        
Disclosure Of Joint Ventures [Line Items]        
ASSETS 344,626 335,003    
Current assets 47,085 42,176    
Cash and cash equivalents 17,119 13,592    
Other current assets 29,966 28,584    
Non-current assets 297,541 292,827    
LIABILITIES 344,626 335,003    
Current liabilities 20,660 18,076    
Current financial liabilities 5,735 5,710    
Other current liabilities 14,925 12,366    
Non-current liabilities 40,911 45,349    
Financial liabilities 17,921 23,381    
Other non-current liabilities 22,990 21,968    
Equity 283,055 271,578    
Net operating revenue 37,505 36,562 62,864  
OPERATING COSTS AND EXPENSES (7,875) (7,069) (5,876)  
Interest expenses (2,398) (2,817) (3,225)  
Financial income and other financial expenses 2,542 2,437 1,620  
Equity in earnings of investees 0 0 0  
Income tax and social contribution (3,977) (4,088) (6,802)  
Net income 25,797 25,025 48,581  
Other comprehensive income 0 0 0  
Total comprehensive income R$ 25,797 R$ 25,025 48,581  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 138,698 R$ 133,074    
Integracao Maranhense [Member]        
Disclosure Of Joint Ventures [Line Items]        
ASSETS 598,513 585,668    
Current assets 71,991 68,873    
Cash and cash equivalents 11,248 9,247    
Other current assets 60,743 59,626    
Non-current assets 526,522 516,795    
LIABILITIES 598,513 585,668    
Current liabilities 18,337 12,559    
Current financial liabilities 8,080 8,047    
Other current liabilities 10,257 4,512    
Non-current liabilities 142,477 140,334    
Financial liabilities 25,231 32,919    
Other non-current liabilities 117,246 107,415    
Equity 437,699 432,775    
Net operating revenue 61,094 63,370 100,482  
OPERATING COSTS AND EXPENSES (12,148) 1,051 (4,022)  
Interest expenses (3,489) (4,236) (4,914)  
Financial income and other financial expenses 2,177 3,970 2,628  
Equity in earnings of investees 0 0 0  
Income tax and social contribution (9,629) (14,735) (27,185)  
Net income 38,005 49,420 66,989  
Other comprehensive income 0 0 0  
Total comprehensive income R$ 38,005 R$ 49,420 66,989  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 214,474 R$ 212,060    
Matrincha [Member]        
Disclosure Of Joint Ventures [Line Items]        
ASSETS 3,017,103 2,984,765    
Current assets 414,369 432,126    
Cash and cash equivalents 94,290 129,197    
Other current assets 320,079 302,929    
Non-current assets 2,602,734 2,552,639    
LIABILITIES 3,017,103 2,984,765    
Current liabilities 135,403 172,783    
Current financial liabilities 97,571 133,551    
Other current liabilities 37,832 39,232    
Non-current liabilities 781,295 781,369    
Financial liabilities 446,594 493,603    
Other non-current liabilities 334,701 287,766    
Equity 2,100,405 2,030,613    
Net operating revenue 333,128 313,948 518,428  
OPERATING COSTS AND EXPENSES (80,106) (42,853) (33,073)  
Interest expenses (62,453) (70,612) (76,652)  
Financial income and other financial expenses 18,123 22,390 17,109  
Equity in earnings of investees 0 0 0  
Income tax and social contribution (47,228) (64,724) (94,589)  
Net income 161,464 158,149 331,223  
Other comprehensive income 0 0 0  
Total comprehensive income R$ 161,464 R$ 158,149 331,223  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 1,029,198 R$ 994,999    
Guaraciaba [Member]        
Disclosure Of Joint Ventures [Line Items]        
ASSETS 1,622,959 1,611,484    
Current assets 218,490 209,444    
Cash and cash equivalents 48,521 52,346    
Other current assets 169,969 157,098    
Non-current assets 1,404,469 1,402,040    
LIABILITIES 1,622,959 1,611,484    
Current liabilities 139,960 147,180    
Current financial liabilities 61,058 46,632    
Other current liabilities 78,902 100,548    
Non-current liabilities 426,030 460,052    
Financial liabilities 307,648 360,398    
Other non-current liabilities 118,382 99,654    
Equity 1,056,969 1,004,252    
Net operating revenue 167,286 165,557 266,855  
OPERATING COSTS AND EXPENSES (36,486) (25,321) (40,926)  
Interest expenses (39,522) (43,496) (45,487)  
Financial income and other financial expenses 8,226 8,472 7,889  
Equity in earnings of investees 0 0 0  
Income tax and social contribution (35,843) (42,209) (20,473)  
Net income 63,661 63,003 167,858  
Other comprehensive income 0 0 0  
Total comprehensive income R$ 63,661 R$ 63,003 167,858  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 517,914 R$ 492,083    
Paranaiba [Member]        
Disclosure Of Joint Ventures [Line Items]        
ASSETS 2,097,314 2,047,430    
Current assets 258,995 255,100    
Cash and cash equivalents 51,417 58,781    
Other current assets 207,578 196,319    
Non-current assets 1,838,319 1,792,330    
LIABILITIES 2,097,314 2,047,430    
Current liabilities 128,717 142,254    
Current financial liabilities 73,612 71,258    
Other current liabilities 55,105 70,996    
Non-current liabilities 688,575 713,251    
Financial liabilities 354,756 416,535    
Other non-current liabilities 333,819 296,716    
Equity 1,280,022 1,191,925    
Net operating revenue 238,796 282,153 231,960  
OPERATING COSTS AND EXPENSES (28,129) (19,808) (20,181)  
Interest expenses (46,671) (58,254) (55,971)  
Financial income and other financial expenses 7,765 9,899 7,541  
Equity in earnings of investees 0 0 0  
Income tax and social contribution (49,686) (65,954) 31,030  
Net income 122,075 148,036 194,379  
Other comprehensive income 0 0 0  
Total comprehensive income R$ 122,075 R$ 148,036 194,379  
Investment interest - % 24.50% 24.50%    
Investment book value R$ 313,606 R$ 292,022    
Mata De Santa Genebra [Member]        
Disclosure Of Joint Ventures [Line Items]        
ASSETS 3,747,356 3,768,174    
Current assets 559,575 689,261    
Cash and cash equivalents 20,964 23,560    
Other current assets 538,611 665,701    
Non-current assets 3,187,781 3,078,913    
LIABILITIES 3,747,356 3,768,174    
Current liabilities 121,565 115,975    
Current financial liabilities 87,054 77,365    
Other current liabilities 34,511 38,610    
Non-current liabilities 2,238,465 2,181,769    
Financial liabilities 1,696,683 1,685,717    
Other non-current liabilities 541,782 496,052    
Equity 1,387,326 1,470,430    
Net operating revenue 391,009 393,463 415,526  
OPERATING COSTS AND EXPENSES (69,978) (64,658) (68,472)  
Interest expenses (114,310) (117,202) (117,725)  
Financial income and other financial expenses (59,962) (36,378) (59,597)  
Equity in earnings of investees 0 0 0  
Income tax and social contribution (49,887) (58,933) (57,676)  
Net income 96,872 116,292 112,056  
Other comprehensive income 0 0 0  
Total comprehensive income R$ 96,872 R$ 116,292 112,056  
Investment interest - % 50.10% 50.10%    
Investment book value R$ 695,051 R$ 736,685    
Cantareira [Member]        
Disclosure Of Joint Ventures [Line Items]        
ASSETS 1,831,108 1,799,642    
Current assets 184,550 182,210    
Cash and cash equivalents 18,432 23,092    
Other current assets 166,118 159,118    
Non-current assets 1,646,558 1,617,432    
LIABILITIES 1,831,108 1,799,642    
Current liabilities 85,003 82,109    
Current financial liabilities 45,666 43,716    
Other current liabilities 39,337 38,393    
Non-current liabilities 752,391 761,795    
Financial liabilities 375,612 410,552    
Other non-current liabilities 376,779 351,243    
Equity 993,714 955,738    
Net operating revenue 178,483 177,852 188,348  
OPERATING COSTS AND EXPENSES (10,429) (8,992) (10,885)  
Interest expenses (42,033) (39,969) (40,077)  
Financial income and other financial expenses 4,578 8,354 2,262  
Equity in earnings of investees 0 0 0  
Income tax and social contribution (43,969) (46,300) (47,212)  
Net income 86,630 90,945 92,436  
Other comprehensive income 0 0 0  
Total comprehensive income R$ 86,630 R$ 90,945 R$ 92,436  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 486,919 R$ 468,311