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Schedule of subsidiaries with non-controlling interest summarized financial information (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
IfrsStatementLineItems [Line Items]        
Assets R$ 49,537,535 R$ 46,784,664    
Current assets 11,189,872 11,407,431    
Non-current assets 38,347,663 35,377,233    
Current liabilities 7,979,993 9,654,392    
Non-current liabilities 19,382,307 16,879,754    
Equity 22,175,235 20,250,518 R$ 17,598,212 R$ 16,336,214
Revenue   18,633,249    
Operating expense (19,119,637) (13,347,822) (11,464,148)  
Finance income (cost) (327,361) 866,271 (455,364)  
Other income (expense) from subsidiaries, jointly controlled entities and associates 366,314 193,547 106,757  
Tax expense (income) (1,259,632) (1,285,365) (675,661)  
NET INCOME 5,048,602 3,909,750 2,062,869  
Comprehensive income 5,201,347 3,730,595 1,939,685  
Cash flows from (used in) operating activities 3,386,832 3,940,844 2,945,006  
Cash flows from (used in) investing activities 31,908 (1,667,571) (1,663,651)  
Cash flows from (used in) financing activities (2,884,427) (1,715,113) (288,037)  
Increase (decrease) in cash and cash equivalents after effect of exchange rate changes 534,313 558,160 993,318  
Compagas [Member]        
IfrsStatementLineItems [Line Items]        
Assets 827,901 749,434    
Current assets 355,500 245,028    
Non-current assets 472,401 504,406    
Liabilities 827,901 749,434    
Current liabilities 220,216 173,144    
Non-current liabilities 99,784 81,230    
Equity 507,901 495,060    
Revenue 783,277 535,206 866,884  
Operating expense (654,643) (452,495) (662,306)  
Finance income (cost) 9,817 (764) 43,186  
Tax expense (income) (38,860) (22,967) (74,791)  
NET INCOME 99,591 58,980 172,973  
Other comprehensive income 294 (343) (1,277)  
Comprehensive income 99,885 58,637 171,696  
Cash flows from (used in) operating activities 178,800 101,708 54,760  
Cash flows from (used in) investing activities (14,273) (17,120) (17,531)  
Cash flows from (used in) financing activities (64,545) (115,625) 14,312  
Increase (decrease) in cash and cash equivalents after effect of exchange rate changes 99,982 (31,037) 51,541  
[custom:CashAndCashEquivalent-0] 110,659 141,696 90,155  
[custom:CashAndCashEquivalent1-0] 210,641 110,659 141,696  
Elejor [Member]        
IfrsStatementLineItems [Line Items]        
Assets 813,670 705,233    
Current assets 166,890 165,150    
Non-current assets 646,780 540,083    
Liabilities 813,670 705,233    
Current liabilities 107,772 95,465    
Non-current liabilities 746,843 596,278    
Equity (40,945) 13,490    
Revenue 171,263 194,849 218,421  
Operating expense (86,871) (67,323) (86,237)  
Finance income (cost) (171,888) (172,049) (92,728)  
Tax expense (income) 33,061 15,154 (13,331)  
NET INCOME (54,435) (29,369) 26,125  
Comprehensive income (54,435) (29,369) 26,125  
Cash flows from (used in) operating activities 127,510 22,097 51,839  
Cash flows from (used in) investing activities (31,095) (208) (314)  
Cash flows from (used in) financing activities (8,151) (56,533)  
Increase (decrease) in cash and cash equivalents after effect of exchange rate changes 96,415 13,738 (5,008)  
[custom:CashAndCashEquivalent-0] 51,616 37,878 42,886  
[custom:CashAndCashEquivalent1-0] 148,031 51,616 37,878  
U E G Araucaria [Member]        
IfrsStatementLineItems [Line Items]        
Assets 776,201 554,079    
Current assets 515,430 392,775    
Non-current assets 260,771 161,304    
Liabilities 776,201 554,079    
Current liabilities 221,853 309,265    
Non-current liabilities 13,771 6,603    
Equity 540,577 238,211    
Revenue 2,250,577 589,909 52,216  
Operating expense (1,879,198) (647,516) (131,596)  
Finance income (cost) 8,952 203 832  
Other income (expense) from subsidiaries, jointly controlled entities and associates     916  
Tax expense (income) (42,248) (19,920) (22,703)  
NET INCOME 338,083 (77,324) (100,335)  
Other comprehensive income   (205) 132  
Comprehensive income 338,083 (77,529) (100,203)  
Cash flows from (used in) operating activities 312,676 23,491 (57,585)  
Cash flows from (used in) investing activities (14,579) 1,317 (1,945)  
Cash flows from (used in) financing activities (64,331) 32,879 45,133  
Increase (decrease) in cash and cash equivalents after effect of exchange rate changes 233,766 57,687 (14,397)  
[custom:CashAndCashEquivalent-0] 64,806 7,119 21,516  
[custom:CashAndCashEquivalent1-0] R$ 298,572 R$ 64,806 R$ 7,119