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17. Investments (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfChangesInEquityAttributableToNoncontrollingShareholdersLineItems [Line Items]      
Equity attributable to non-controlling shareholders, beginning R$ 302,661 R$ 260,044 R$ 317,953
Net income (loss) 36,941 84,629 (21,300)
Other comprehensive income 154 (123) 65
Deliberation of additional dividends proposed   (11,053) (23,072)
Distribution of dividends with retained earnings     (9,342)
Dividends (36,467) (30,836) (4,260)
Equity attributable to non-controlling shareholders, ending 303,289 302,661 260,044
Compagas      
DisclosureOfChangesInEquityAttributableToNoncontrollingShareholdersLineItems [Line Items]      
Equity attributable to non-controlling shareholders, beginning 194,901 146,818 144,904
Net income (loss) 29,213 55,837 2,425
Other comprehensive income 91 (123) 65
Deliberation of additional dividends proposed   0 0
Distribution of dividends with retained earnings     0
Dividends (11,243) (7,631) (576)
Equity attributable to non-controlling shareholders, ending 212,962 194,901 146,818
Elejor      
DisclosureOfChangesInEquityAttributableToNoncontrollingShareholdersLineItems [Line Items]      
Equity attributable to non-controlling shareholders, beginning 18,518 23,910 22,200
Net income (loss) 22,899 28,866 14,736
Other comprehensive income 0 0 0
Deliberation of additional dividends proposed   (11,053) 0
Distribution of dividends with retained earnings     (9,342)
Dividends (25,224) (23,205) (3,684)
Equity attributable to non-controlling shareholders, ending 16,193 18,518 23,910
UEG Araucária      
DisclosureOfChangesInEquityAttributableToNoncontrollingShareholdersLineItems [Line Items]      
Equity attributable to non-controlling shareholders, beginning 89,242 89,316 150,849
Net income (loss) (15,171) (74) (38,461)
Other comprehensive income 63 0 0
Deliberation of additional dividends proposed   0 (23,072)
Distribution of dividends with retained earnings     0
Dividends 0 0 0
Equity attributable to non-controlling shareholders, ending R$ 74,134 R$ 89,242 R$ 89,316