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16 Investments (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity Attributable To Non-Controlling Shareholders [Roll Forward]      
Equity attributable to non-controlling shareholders, beginning R$ 345,798 R$ 303,289 R$ 302,661
Net income (loss) 5,548    
Other comprehensive income (207) (601) 154
Additional dividends proposed (51,799) (3,335)  
Dividends (7,933) 31,352 (36,467)
Gain with interest variation in Subsidiary   4,874  
Equity attributable to non-controlling shareholders, ending 291,407 345,798 303,289
Compagas [member]      
Equity Attributable To Non-Controlling Shareholders [Roll Forward]      
Equity attributable to non-controlling shareholders, beginning 273,580 212,962 194,901
Net income (loss) 28,898 84,758 29,213
Other comprehensive income (168) (626) 91
Additional dividends proposed (51,799)    
Dividends (7,933) (23,514) (11,243)
Equity attributable to non-controlling shareholders, ending 242,578 273,580 212,962
Elejor [member]      
Equity Attributable To Non-Controlling Shareholders [Roll Forward]      
Equity attributable to non-controlling shareholders, beginning 12,858 16,193 18,518
Net income (loss) (8,812) 7,838 22,899
Other comprehensive income    
Additional dividends proposed   (3,335)  
Dividends   (7,838) (25,224)
Equity attributable to non-controlling shareholders, ending 4,046 12,858 16,193
UEG Araucaria [member]      
Equity Attributable To Non-Controlling Shareholders [Roll Forward]      
Equity attributable to non-controlling shareholders, beginning 59,360 74,134 89,242
Net income (loss) (14,538) (19,673) (15,171)
Other comprehensive income (39) 25 63
Gain with interest variation in Subsidiary 4,874  
Equity attributable to non-controlling shareholders, ending R$ 44,783 R$ 59,360 R$ 74,134