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16 Investments (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Jan. 02, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of subsidiaries [line items]          
ASSETS   R$ 38,312,550 R$ 35,930,100    
Current assets   7,909,196 6,677,846    
Noncurrent assets   30,403,354 29,252,254    
Current liabilities   5,345,621 6,695,114    
Noncurrent liabilities   15,368,717 12,898,772    
Equity   17,598,212 16,336,214 R$ 15,510,503 R$ 14,978,142
STATEMENT OF INCOME          
Operating revenues   16,244,274 14,934,780 14,024,573  
Operating costs and expenses   (11,760,176) (11,501,688) (10,665,890)  
Financial results   (488,486) (438,050) (748,440)  
Equity in earnings of investees   106,757 135,888 101,739  
Income tax and social contribution   639,326 511,993 274,686  
Net income (loss) R$ 2,070,551 2,062,869 1,444,004 1,118,255  
Total comprehensive income   1,939,685 1,405,644 1,086,917  
STATEMENTS OF CASH FLOWS          
Cash flows from operational activities   2,945,006 1,770,971 989,206  
Cash flows from investment activities   (1,663,651) (2,149,153) (1,581,173)  
Cash flows from financing activities   (288,037) 1,286,516 649,969  
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS   993,318 908,334 58,002  
Cash and cash equivalents at the beginning of the period 1,948,409 1,948,409 1,040,075 982,073  
Cash and cash equivalents at the end of the period   2,941,727 1,948,409 1,040,075  
CHANGE IN CASH AND CASH EQUIVALENTS   993,318 908,334 58,002  
Compagas [Member]          
Disclosure of subsidiaries [line items]          
ASSETS   904,993 675,286 632,910  
Current assets   313,896 204,725 151,966  
Noncurrent assets   591,097 470,561 480,944  
LIABILITIES   904,993 675,286 632,910  
Current liabilities   236,190 133,769 147,743  
Noncurrent liabilities   110,475 106,900 87,409  
Equity   558,328 434,617 397,758  
STATEMENT OF INCOME          
Operating revenues   866,884 588,532 515,563  
Operating costs and expenses   (662,306) (515,594) (309,213)  
Financial results   43,186 (2,411) (25,612)  
Equity in earnings of investees    
Income tax and social contribution   (74,791) (10,909) (66,785)  
Net income (loss)   172,973 59,618 113,953  
Other comprehensive income   (1,277) 187 (251)  
Total comprehensive income   171,696 59,805 113,702  
STATEMENTS OF CASH FLOWS          
Cash flows from operational activities   54,760 66,017 83,661  
Cash flows from investment activities   (17,531) (15,961) (14,268)  
Cash flows from financing activities   14,312 (43,980) (20,623)  
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS   51,541 6,076 48,770  
Cash and cash equivalents at the beginning of the period 90,155 90,155 84,079 35,309  
Cash and cash equivalents at the end of the period   141,696 90,155 84,079  
CHANGE IN CASH AND CASH EQUIVALENTS   51,541 6,076 48,770  
Elejor [Member]          
Disclosure of subsidiaries [line items]          
ASSETS     652,175 675,450  
Current assets     80,990 77,216  
Noncurrent assets     571,185 598,234  
LIABILITIES     652,175 675,450  
Current liabilities     124,880 164,574  
Noncurrent liabilities     473,318 449,149  
Equity     53,977 61,727  
STATEMENT OF INCOME          
Operating revenues   218,421 293,942 291,597  
Operating costs and expenses   (86,237) (89,931) (93,230)  
Financial results   (92,728) (89,301) (54,254)  
Equity in earnings of investees    
Income tax and social contribution   (13,331) (38,379) (47,893)  
Net income (loss)   26,125 76,331 96,220  
Other comprehensive income    
Total comprehensive income   26,125 76,331 96,220  
STATEMENTS OF CASH FLOWS          
Cash flows from operational activities   51,839 127,108 143,911  
Cash flows from investment activities   (314) (2,659) (1,461)  
Cash flows from financing activities   (56,533) (119,468) (143,028)  
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS   (5,008) 4,981 (578)  
Cash and cash equivalents at the beginning of the period 42,886 42,886 37,905 38,483  
Cash and cash equivalents at the end of the period   37,878 42,886 37,905  
CHANGE IN CASH AND CASH EQUIVALENTS   (5,008) 4,981 (578)  
UEG Araucaria [Member]          
Disclosure of subsidiaries [line items]          
ASSETS     436,137 507,060  
Current assets     33,573 99,101  
Noncurrent assets     402,564 407,959  
LIABILITIES     436,137 507,060  
Current liabilities     42,185 38,386  
Noncurrent liabilities     23,290 22,470  
Equity     370,662 446,204  
STATEMENT OF INCOME          
Operating revenues   52,216 524 129,084  
Operating costs and expenses   (131,596) (94,970) (121,883)  
Financial results   832 2,275 5,302  
Equity in earnings of investees   916 (5,777)  
Income tax and social contribution   (22,703) 16,316 (7,098)  
Net income (loss)   (100,335) (75,855) (372)  
Other comprehensive income   132  
Total comprehensive income   (100,203) (75,855) (372)  
STATEMENTS OF CASH FLOWS          
Cash flows from operational activities   (57,585) (26,980) (86,840)  
Cash flows from investment activities   (1,945) (2,768) 118,460  
Cash flows from financing activities   45,133  
TOTAL EFFECTS ON CASH AND CASH EQUIVALENTS   (14,397) (29,748) 31,620  
Cash and cash equivalents at the beginning of the period R$ 21,516 21,516 51,264 19,644  
Cash and cash equivalents at the end of the period   7,119 21,516 51,264  
CHANGE IN CASH AND CASH EQUIVALENTS   R$ (14,397) R$ (29,748) R$ 31,620