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Schedule of summarized information on the main jointly controlled subsidiaries (Details) - BRL (R$)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
IfrsStatementLineItems [Line Items]        
ASSETS R$ 49,537,535,000 R$ 46,784,664,000    
Current assets 11,189,872,000 11,407,431,000    
Cash and cash equivalents 3,472,845,000 3,222,768    
Noncurrent assets 38,347,663,000 35,377,233,000    
Current liabilities 7,979,993,000 9,654,392,000    
Noncurrent liabilities 19,382,307,000 16,879,754,000    
Equity 22,175,235,000 20,250,518,000 R$ 17,598,212,000 R$ 16,336,214,000
Net operating income   18,633,249,000    
Operating costs and expenses (19,119,637,000) (13,347,822,000) (11,464,148,000)  
Equity in income of subsidiaries 366,314,000 193,547,000 106,757,000  
Income tax and social contribution (1,259,632,000) (1,285,365,000) (675,661,000)  
Net income 5,048,602,000 3,909,750,000 2,062,869,000  
TOTAL COMPREHENSIVE INCOME  5,201,347,000 3,730,595,000 1,939,685,000  
Voltalia [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 224,632,000 222,038,000    
Current assets 3,711,000 3,623,000    
Cash and cash equivalents 3,667,000 3,579,000    
Other current assets 44,000 44,000    
Noncurrent assets 220,921,000 218,415,000    
LIABILITIES 224,632,000 222,038,000    
Current liabilities 2,206,000 2,199,000    
Financial liabilities    
Other current liabilities 2,206,000 2,199,000    
Noncurrent liabilities    
Financial liabilities    
Other noncurrent liabilities    
Equity 222,426,000 219,839,000    
Operating costs and expenses (64,000) (66,000) (111,000)  
Financial results 162,000 32,000 146,000  
Equity in income of subsidiaries 2,506,000 (4,893,000) (7,080,000)  
Income tax and social contribution (17,000)   (5,000)  
Net income 2,587,000 (4,927,000) (7,050,000)  
Other comprehensive income      
TOTAL COMPREHENSIVE INCOME  R$ 2,587,000 R$ (4,927,000) (7,050,000)  
Investment interest - % 4900.00% 49.00%    
Investment book value R$ 108,990,000 R$ 107,721,000    
Caiua [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 284,870,000 267,425,000    
Current assets 30,304,000 31,048,000    
Cash and cash equivalents 6,117,000 6,871,000    
Other current assets 24,187,000 24,177,000    
Noncurrent assets 254,566,000 236,377,000    
LIABILITIES 284,870,000 267,425,000    
Current liabilities 14,562,000 18,995,000    
Financial liabilities 7,386,000 7,392,000    
Other current liabilities 7,176,000 11,603,000    
Noncurrent liabilities 51,986,000 53,816,000    
Financial liabilities 35,606,000 42,864,000    
Other noncurrent liabilities 16,380,000 10,952,000    
Equity 218,322,000 194,614,000    
Net operating income 43,128,000 17,927,000 25,180,000  
Operating costs and expenses (5,609,000) (34,584,000) (5,481,000)  
Financial results (2,348,000) (3,389,000) (4,557,000)  
Equity in income of subsidiaries      
Income tax and social contribution (7,078,000) 1,752,000 (5,348,000)  
Net income 28,093,000 (18,294,000) 9,794,000  
Other comprehensive income      
TOTAL COMPREHENSIVE INCOME  R$ 28,093,000 R$ (18,294,000) 9,794,000  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 106,977,000 R$ 95,362,000    
Integracao Maranhense [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 515,495,000 475,734,000    
Current assets 65,219,000 59,709,000    
Cash and cash equivalents 16,501,000 12,696,000    
Other current assets 48,718,000 47,013,000    
Noncurrent assets 450,276,000 416,025,000    
LIABILITIES 515,495,000 475,734,000    
Current liabilities 53,132,000 51,926,000    
Financial liabilities 13,169,000 13,180,000    
Other current liabilities 39,963,000 38,746,000    
Noncurrent liabilities 122,438,000 120,579,000    
Financial liabilities 52,653,000 65,624,000    
Other noncurrent liabilities 69,785,000 54,955,000    
Equity 339,925,000 303,229,000    
Net operating income 71,868,000 31,418,000 44,264,000  
Operating costs and expenses (10,508,000) 11,706,000 (5,672,000)  
Financial results (3,954,000) (5,229,000) (6,594,000)  
Equity in income of subsidiaries      
Income tax and social contribution (16,072,000) (9,991,000) (8,904,000)  
Net income 41,334,000 27,904,000 23,094,000  
Other comprehensive income      
TOTAL COMPREHENSIVE INCOME  R$ 41,334,000 R$ 27,904,000 23,094,000  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 166,563,000 R$ 148,581,000    
Matrincha [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 2,610,094,000 2,357,028,000    
Current assets 367,428,000 261,168,000    
Cash and cash equivalents 96,346,000 46,198,000    
Other current assets 271,082,000 214,970,000    
Noncurrent assets 2,242,666,000 2,095,860,000    
LIABILITIES 2,610,094,000 2,357,028,000    
Current liabilities 126,211,000 192,512,000    
Financial liabilities 91,811,000 80,141,000    
Other current liabilities 34,400,000 112,371,000    
Noncurrent liabilities 827,205,000 665,528,000    
Financial liabilities 685,525,000 612,413,000    
Other noncurrent liabilities 141,680,000 53,115,000    
Equity 1,656,678,000 1,498,988,000    
Net operating income 396,622,000 328,171,000 250,188,000  
Operating costs and expenses (24,341,000) (160,795,000) (70,886,000)  
Financial results (83,280,000) (71,164,000) (59,794,000)  
Equity in income of subsidiaries      
Income tax and social contribution (91,830,000) (30,178,000) (33,103,000)  
Net income 197,171,000 66,034,000 86,405,000  
Other comprehensive income      
TOTAL COMPREHENSIVE INCOME  R$ 197,171,000 R$ 66,034,000 86,405,000  
Investment interest - % 49.00% 4900.00%    
Investment book value R$ 811,771,000 R$ 734,503,000    
Guaraciaba [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 1,413,231,000 1,269,378,000    
Current assets 194,283,000 165,063,000    
Cash and cash equivalents 70,543,000 25,565,000    
Other current assets 123,740,000 139,498,000    
Noncurrent assets 1,218,948,000 1,104,315,000    
LIABILITIES 1,413,231,000 1,269,378,000    
Current liabilities 101,042,000 86,163,000    
Financial liabilities 34,529,000 28,741,000    
Other current liabilities 66,513,000 57,422,000    
Noncurrent liabilities 480,320,000 446,133,000    
Financial liabilities 428,314,000 446,801,000    
Other noncurrent liabilities 52,006,000 (668,000)    
Equity 831,869,000 737,082,000    
Net operating income 229,117,000 109,978,000 111,912,000  
Operating costs and expenses (7,185,000) (8,317,000) (29,067,000)  
Financial results (44,131,000) (38,883,000) (42,548,000)  
Equity in income of subsidiaries      
Income tax and social contribution (60,617,000) (22,084,000) (2,926,000)  
Net income 117,184,000 40,694,000 37,371,000  
Other comprehensive income      
TOTAL COMPREHENSIVE INCOME  R$ 117,184,000 R$ 40,694,000 37,371,000  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 407,615,000 R$ 361,170,000    
Paranaiba [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 1,829,340,000 1,687,613,000    
Current assets 193,190,000 179,229,000    
Cash and cash equivalents 32,665,000 20,820,000    
Other current assets 160,525,000 158,409,000    
Noncurrent assets 1,636,150,000 1,508,384,000    
LIABILITIES 1,829,340,000 1,687,613,000    
Current liabilities 85,964,000 78,981,000    
Financial liabilities 51,453,000 62,143,000    
Other current liabilities 34,511,000 16,838,000    
Noncurrent liabilities 817,159,000 777,279,000    
Financial liabilities 522,289,000 545,200,000    
Other noncurrent liabilities 294,870,000 232,079,000    
Equity 926,217,000 831,353,000    
Net operating income 285,483,000 478,147,000 198,573,000  
Operating costs and expenses (17,537,000) (18,801,000) (30,560,000)  
Financial results (62,138,000) (48,184,000) (54,154,000)  
Equity in income of subsidiaries      
Income tax and social contribution (62,638,000) (125,646,000) (47,024,000)  
Net income 143,170,000 285,516,000 66,835,000  
Other comprehensive income      
TOTAL COMPREHENSIVE INCOME  R$ 143,170,000 R$ 285,516,000 66,835,000  
Investment interest - % 24.50% 24.50%    
Investment book value R$ 226,923,000 R$ 203,681,000    
Mata De Santa Genebra [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 3,203,892,000 2,712,737,000    
Current assets 681,494,000 340,382,000    
Cash and cash equivalents 387,027,000 61,171,000    
Other current assets 294,467,000 279,211,000    
Noncurrent assets 2,522,398,000 2,372,355,000    
LIABILITIES 3,203,892,000 2,712,737,000    
Current liabilities 123,884,000 158,350,000    
Financial liabilities 45,898,000 104,308,000    
Other current liabilities 77,986,000 54,042,000    
Noncurrent liabilities 1,660,867,000 1,234,165,000    
Financial liabilities 1,630,306,000 1,215,988,000    
Other noncurrent liabilities 30,561,000 18,177,000    
Equity 1,419,141,000 1,320,222,000    
Net operating income 426,573,000 364,070,000 357,522,000  
Operating costs and expenses (72,970,000) (125,569,000) (384,228,000)  
Financial results (162,110,000) (91,947,000) (99,186,000)  
Equity in income of subsidiaries      
Income tax and social contribution (65,399,000) (49,560,000) 42,627,000  
Net income 126,094,000 96,994,000 (83,265,000)  
Other comprehensive income      
TOTAL COMPREHENSIVE INCOME  R$ 126,094,000 R$ 96,994,000 (83,265,000)  
Investment interest - % 50.10% 5010.00%    
Investment book value R$ 710,989,000 R$ 661,430,000    
Cantareira [Member]        
IfrsStatementLineItems [Line Items]        
ASSETS 1,715,776,000 1,567,577,000    
Current assets 196,424,000 165,816,000    
Cash and cash equivalents 52,354,000 34,435,000    
Other current assets 144,070,000 131,381,000    
Noncurrent assets 1,519,352,000 1,401,761,000    
LIABILITIES 1,715,776,000 1,567,577,000    
Current liabilities 78,982,000 63,206,000    
Financial liabilities 52,397,000 41,314,000    
Other current liabilities 26,585,000 21,892,000    
Noncurrent liabilities 744,285,000 770,317,000    
Financial liabilities 456,180,000 489,784,000    
Other noncurrent liabilities 288,105,000 280,533,000    
Equity 892,509,000 734,054,000    
Net operating income 233,888,000 196,039,000 138,259,000  
Operating costs and expenses (24,727,000) (23,533,000) (5,360,000)  
Financial results (43,794,000) (40,630,000) (46,190,000)  
Equity in income of subsidiaries      
Income tax and social contribution (56,201,000) (44,805,000) (29,498,000)  
Net income 109,166,000 87,071,000 57,211,000  
Other comprehensive income      
TOTAL COMPREHENSIVE INCOME  R$ 109,166,000 R$ 87,071,000 R$ 57,211,000  
Investment interest - % 49.00% 49.00%    
Investment book value R$ 437,330,000 R$ 359,686,000