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9. Net Sectorial Financial Assets and Liabilities (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning R$ 59,699 R$ (278,992)  
Operating revenues, constitution 965,452 457,494  
Operating revenues, amortization 19,892 309,546  
Financial results, updating 20,219 (9,129)  
Rate flags (482,974) (419,220)  
Net sectorial financial assets and liabilities, ending 582,288 59,699  
Sectorial financial assets, current 421,184 171,609 R$ 0
Sectorial financial assets, noncurrent 257,635 171,609 0
Sectorial financial liabilities, current 0 (192,819) (155,261)
Sectorial financial liabilities, noncurrent (96,531) (90,700) R$ (123,731)
Portion A | Electricity purchased for resale - Itaipu      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 537,704 424,085  
Operating revenues, constitution 661,144 495,889  
Operating revenues, amortization (348,586) (420,054)  
Financial results, updating 35,981 37,784  
Rate flags 0 0  
Net sectorial financial assets and liabilities, ending 886,243 537,704  
Portion A | Electricity purchased for resale - CVA Energ      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 497,885 (536,125)  
Operating revenues, constitution 710,482 937,324  
Operating revenues, amortization (129,555) 517,751  
Financial results, updating 31,053 (1,845)  
Rate flags (482,974) (419,220)  
Net sectorial financial assets and liabilities, ending 626,891 497,885  
Portion A | Transport of energy using the transmission system - basic grid      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 47,239 8,411  
Operating revenues, constitution (36,959) 50,426  
Operating revenues, amortization (43,101) (12,275)  
Financial results, updating 2,307 677  
Rate flags 0 0  
Net sectorial financial assets and liabilities, ending (30,514) 47,239  
Portion A | Transport of energy purchased from Itaipu      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 12,923 7,703  
Operating revenues, constitution 21,526 11,067  
Operating revenues, amortization (12,194) (7,155)  
Financial results, updating 995 1,308  
Rate flags 0 0  
Net sectorial financial assets and liabilities, ending 23,250 12,923  
Portion A | ESS      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning (591,408) (273,418)  
Operating revenues, constitution (302,226) (529,932)  
Operating revenues, amortization 443,817 262,568  
Financial results, updating (32,155) (50,626)  
Rate flags 0 0  
Net sectorial financial assets and liabilities, ending (481,972) (591,408)  
Portion A | CDE      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning (141,893) 70,611  
Operating revenues, constitution 231,308 (158,514)  
Operating revenues, amortization 69,851 (60,149)  
Financial results, updating (182) 6,159  
Rate flags 0 0  
Net sectorial financial assets and liabilities, ending 159,084 (141,893)  
Portion A | Proinfa      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning (5,188) 17,293  
Operating revenues, constitution 6,111 (14,677)  
Operating revenues, amortization 2,024 (10,423)  
Financial results, updating 42 2,619  
Rate flags 0 0  
Net sectorial financial assets and liabilities, ending 2,989 (5,188)  
Other financial components | Neutrality      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 121,247 190,976  
Operating revenues, constitution 100,280 28,694  
Operating revenues, amortization (100,661) (99,593)  
Financial results, updating 2,162 1,170  
Rate flags 0 0  
Net sectorial financial assets and liabilities, ending 123,028 121,247  
Other financial components | Tariff refunds      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 48,193 0  
Operating revenues, constitution 8,482 97,426  
Operating revenues, amortization (57,214) (54,516)  
Financial results, updating 6,811 5,283  
Rate flags 0 0  
Net sectorial financial assets and liabilities, ending 6,272 48,193  
Other financial components | Overcontracting      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning (187,928) 0  
Operating revenues, constitution (310,975) (183,728)  
Operating revenues, amortization 189,289 0  
Financial results, updating (9,419) (4,200)  
Rate flags 0 0  
Net sectorial financial assets and liabilities, ending (319,033) (187,928)  
Other financial components | Extraordinary Tariff Review      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning (145,774) (71,244)  
Operating revenues, constitution (80,493) (78,254)  
Operating revenues, amortization 52,290 13,479  
Financial results, updating (6,986) (9,755)  
Rate flags 0 0  
Net sectorial financial assets and liabilities, ending (180,963) (145,774)  
Other financial components | Financial exposure      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning (136,325) 156,170  
Operating revenues, constitution (54,421) (203,797)  
Operating revenues, amortization (37,176) (90,272)  
Financial results, updating (10,494) 1,574  
Rate flags 0 0  
Net sectorial financial assets and liabilities, ending (238,416) (136,325)  
Other financial components | Others      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 3,024 149  
Operating revenues, constitution 11,193 5,570  
Operating revenues, amortization (8,892) (3,418)  
Financial results, updating 104 723  
Rate flags 0 0  
Net sectorial financial assets and liabilities, ending 5,429 3,024  
Other financial components | Deferral IRT      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning 0 (257,353)  
Operating revenues, constitution   0  
Operating revenues, amortization   257,353  
Financial results, updating   0  
Rate flags   0  
Net sectorial financial assets and liabilities, ending   0  
Other financial components | Preliminary injunctions CDE      
Disclosure of financial assets [line items]      
Net sectorial financial assets and liabilities, beginning R$ 0 (16,250)  
Operating revenues, constitution   0  
Operating revenues, amortization   16,250  
Financial results, updating   0  
Rate flags   0  
Net sectorial financial assets and liabilities, ending   R$ 0