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17. Investments (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
DisclosureOfSummarizedFinancialInformationSubsidiariesWithNoncontrollingInterestLineItems [Line Items]        
ASSETS R$ 35,930,100 R$ 33,162,377    
Current assets 6,677,846 5,701,834    
Noncurrent assets 29,252,254 27,460,543    
LIABILITIES   33,162,377    
Current liabilities 6,695,114 6,109,914    
Noncurrent liabilities 12,898,772 11,541,960    
Equity 16,336,214 15,510,503 R$ 14,978,142 R$ 14,480,492
STATEMENT OF INCOME        
Net operating revenues 14,934,780 14,024,573 13,101,753  
Operating costs and expenses (11,501,688) (10,665,890) (10,234,115)  
Financial results (438,050) (748,440) (594,656)  
Equity in earnings of investees 135,888 101,739 166,411  
Income tax and social contribution 511,993 274,686 519,690  
Net income (loss) 1,444,004 1,118,255 874,472  
Total comprehensive income 1,405,644 1,086,917 817,271  
STATEMENTS OF CASH FLOWS        
Cash flows from operational activities 1,770,971 989,206 1,476,818  
Cash flows from investment activities (2,149,153) (1,581,173) (2,511,075)  
Cash flows from financing activities 1,286,516 649,969 535,603  
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS 908,334 58,002 (498,654)  
Cash and cash equivalents at the beginning of the period 1,040,075 982,073 1,480,727  
Cash and cash equivalents at the end of the period 1,948,409 1,040,075 982,073  
CHANGE IN CASH AND CASH EQUIVALENTS 908,334 58,002 (498,654)  
Compagas        
DisclosureOfSummarizedFinancialInformationSubsidiariesWithNoncontrollingInterestLineItems [Line Items]        
ASSETS 675,286 632,910 526,477  
Current assets 204,725 151,966 135,292  
Noncurrent assets 470,561 480,944 391,185  
LIABILITIES 675,286 632,910 526,477  
Current liabilities 133,769 147,743 180,133  
Noncurrent liabilities 106,900 87,409 46,716  
Equity 434,617 397,758 299,628  
STATEMENT OF INCOME        
Net operating revenues 588,532 515,563 542,822  
Operating costs and expenses (515,594) (309,213) (534,817)  
Financial results (2,411) (25,612) (1,422)  
Equity in earnings of investees 0 0 0  
Income tax and social contribution (10,909) (66,785) (1,632)  
Net income (loss) 59,618 113,953 4,951  
Other comprehensive income 187 (251) 132  
Total comprehensive income 59,805 113,702 5,083  
STATEMENTS OF CASH FLOWS        
Cash flows from operational activities 66,017 83,661 32,714  
Cash flows from investment activities (15,961) (14,268) (25,975)  
Cash flows from financing activities (43,980) (20,623) (751)  
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS 6,076 48,770 5,988  
Cash and cash equivalents at the beginning of the period 84,079 35,309 29,321  
Cash and cash equivalents at the end of the period 90,155 84,079 35,309  
CHANGE IN CASH AND CASH EQUIVALENTS 6,076 48,770 5,988  
Elejor        
DisclosureOfSummarizedFinancialInformationSubsidiariesWithNoncontrollingInterestLineItems [Line Items]        
ASSETS 652,175 675,450 708,688  
Current assets 80,990 77,216 76,231  
Noncurrent assets 571,185 598,234 632,457  
LIABILITIES 652,175 675,450 708,688  
Current liabilities 124,880 164,574 142,222  
Noncurrent liabilities 473,318 449,149 486,765  
Equity 53,977 61,727 79,701  
STATEMENT OF INCOME        
Net operating revenues 293,942 291,597 263,686  
Operating costs and expenses (89,931) (93,230) (96,321)  
Financial results (89,301) (54,254) (93,717)  
Equity in earnings of investees 0 0 0  
Income tax and social contribution (38,379) (47,893) (24,525)  
Net income (loss) 76,331 96,220 49,123  
Other comprehensive income 0 0 0  
Total comprehensive income 76,331 96,220 49,123  
STATEMENTS OF CASH FLOWS        
Cash flows from operational activities 127,108 143,911 104,136  
Cash flows from investment activities (2,659) (1,461) (1,465)  
Cash flows from financing activities (119,468) (143,028) (105,843)  
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS 4,981 (578) (3,172)  
Cash and cash equivalents at the beginning of the period 37,905 38,483 41,655  
Cash and cash equivalents at the end of the period 42,886 37,905 38,483  
CHANGE IN CASH AND CASH EQUIVALENTS 4,981 (578) (3,172)  
UEG Araucária        
DisclosureOfSummarizedFinancialInformationSubsidiariesWithNoncontrollingInterestLineItems [Line Items]        
ASSETS 436,137 507,060 529,251  
Current assets 33,573 99,101 162,814  
Noncurrent assets 402,564 407,959 366,437  
LIABILITIES 436,137 507,060 529,251  
Current liabilities 42,185 38,386 62,253  
Noncurrent liabilities 23,290 22,470 20,422  
Equity 370,662 446,204 446,576  
STATEMENT OF INCOME        
Net operating revenues 524 129,084 57,432  
Operating costs and expenses (94,970) (121,883) (259,324)  
Financial results 2,275 5,302 18,499  
Equity in earnings of investees 0 (5,777) (55,284)  
Income tax and social contribution 16,316 (7,098) 46,358  
Net income (loss) (75,855) (372) (192,319)  
Other comprehensive income 0 0 0  
Total comprehensive income (75,855) (372) (192,319)  
STATEMENTS OF CASH FLOWS        
Cash flows from operational activities (19,379) (86,840) 65,203  
Cash flows from investment activities (10,369) 118,460 21,587  
Cash flows from financing activities 0 0 (200,000)  
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS (29,748) 31,620 (113,210)  
Cash and cash equivalents at the beginning of the period 51,264 19,644 132,854  
Cash and cash equivalents at the end of the period 21,516 51,264 19,644  
CHANGE IN CASH AND CASH EQUIVALENTS R$ (29,748) R$ 31,620 R$ (113,210)