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19. Intangible Assets (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning R$ 6,452,824    
Effect of acquisition of control of Costa Oeste and Marumbi 66,775    
Loss on disposal (28,742) R$ (42,740) R$ (47,434)
Intangible assets, beginning 6,029,097 6,452,824  
Distribution concession agreement in service      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 7,907,965 7,537,158  
Acquisitions   0  
Customers contributions   628  
Provision for claims added to the cost of the works   0  
Transfers to contract assets 0 0  
Transfers from contract assets 775,701    
Capitalizations for intangible in service   822,472  
Amortization of quotas - concession and authorization 431,963 (411,575)  
Amortization of quotas - PIS/Pasep and Cofins credits 10,813 (11,014)  
Loss on disposal 28,098 29,704  
Intangible assets, beginning 8,212,792 7,907,965 7,537,158
Distribution concession agreement in progress      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 714,446 849,715  
Acquisitions   757,709  
Customers contributions   0  
Provision for claims added to the cost of the works   (1,587)  
Transfers to contract assets 714,446 (56,853)  
Transfers from contract assets 0    
Capitalizations for intangible in service   (822,472)  
Amortization of quotas - concession and authorization 0 0  
Amortization of quotas - PIS/Pasep and Cofins credits 0 0  
Loss on disposal 0 12,066  
Intangible assets, beginning 0 714,446 849,715
Distribution concession agreement special liabilities in service      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning (2,845,438) (2,845,024)  
Acquisitions   0  
Customers contributions   (579)  
Provision for claims added to the cost of the works   0  
Transfers to contract assets 0 0  
Transfers from contract assets 107,679    
Capitalizations for intangible in service   (128,351)  
Amortization of quotas - concession and authorization 130,388 125,740  
Amortization of quotas - PIS/Pasep and Cofins credits 0 0  
Loss on disposal 0 (2,776)  
Intangible assets, beginning 2,822,729 (2,845,438) (2,845,024)
Distribution concession agreement special liabilities in progress      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning (26,100) (28,468)  
Acquisitions   0  
Customers contributions   (125,983)  
Provision for claims added to the cost of the works   0  
Transfers to contract assets 26,100 0  
Transfers from contract assets 0    
Capitalizations for intangible in service   128,351  
Amortization of quotas - concession and authorization 0 0  
Amortization of quotas - PIS/Pasep and Cofins credits 0 0  
Loss on disposal 0 0  
Intangible assets, beginning 0 (26,100) (28,468)
Distribution concession agreement      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 5,750,873 5,513,381  
Acquisitions   757,709  
Customers contributions   (125,934)  
Provision for claims added to the cost of the works   (1,587)  
Transfers to contract assets 688,346 (56,853)  
Transfers from contract assets 668,022    
Capitalizations for intangible in service   0  
Amortization of quotas - concession and authorization 301,575 (285,835)  
Amortization of quotas - PIS/Pasep and Cofins credits 10,813 (11,014)  
Loss on disposal 28,098 38,994  
Intangible assets, beginning 5,390,063 5,750,873 5,513,381
Generation concession agreement in service      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 236,443 254,280  
ANEEL grant - use of public property 0 0  
Business combination (Note 1.2) 0    
Capitalizations for intangible in service 7,279    
Amortization of quotas - concession and authorization 17,311 (17,837)  
Transfers to/from property, plant and equipment   0  
Intangible assets, beginning 226,411 236,443 254,280
Generation concession agreement in progress      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 6,977 6,299  
ANEEL grant - use of public property 302 678  
Business combination (Note 1.2) 0    
Capitalizations for intangible in service 7,279    
Amortization of quotas - concession and authorization 0 0  
Transfers to/from property, plant and equipment   0  
Intangible assets, beginning 0 6,977 6,299
Generation concession agreement concession authorization rights      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 375,801 403,133  
ANEEL grant - use of public property 0 0  
Business combination (Note 1.2) 4,845    
Capitalizations for intangible in service 0    
Amortization of quotas - concession and authorization 13,205 (13,139)  
Transfers to/from property, plant and equipment   (14,193)  
Intangible assets, beginning 367,441 375,801 403,133
Generation concession agreement      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 619,221 663,712  
ANEEL grant - use of public property 302 678  
Business combination (Note 1.2) 4,845    
Capitalizations for intangible in service 0    
Amortization of quotas - concession and authorization 30,516 (30,976)  
Transfers to/from property, plant and equipment   (14,193)  
Intangible assets, beginning 593,852 619,221 663,712
Gas distribution in service      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 24,417 198,271  
Acquisitions   0  
Transfers to contract assets 0 (154,908)  
Transfers from contract assets 2,042    
Capitalizations for intangible in service (22,759) 10,011  
Amortization of quotas - concession and authorization   (28,753)  
Loss on disposal (81) 204  
Intangible assets, beginning 3,619 24,417 198,271
Gas distribution in progress      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 19,471 238,509  
Acquisitions   13,745  
Transfers to contract assets (19,471) (24,501)  
Transfers from contract assets 0    
Capitalizations for intangible in service 0 (10,011)  
Amortization of quotas - concession and authorization   0  
Loss on disposal 0 0  
Intangible assets, beginning 0 19,471 238,509
Gas distribution      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 43,888 40,238  
Acquisitions   13,745  
Transfers to contract assets (19,471) (179,409)  
Transfers from contract assets 2,042    
Capitalizations for intangible in service (22,759) 0  
Amortization of quotas - concession and authorization   (28,753)  
Loss on disposal (81) 204  
Intangible assets, beginning 3,619 43,888 40,238
Other in service      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 22,693 25,725  
Effect of acquisition of control of Costa Oeste and Marumbi 0    
Acquisitions 0 0  
Capitalizations for intangible in service 9,448 5,744  
Amortization of quotas - concession and authorization 6,410 (8,809)  
Amortization of quotas - PIS/Pasep and Cofins credits 23 (54)  
Transfers to/from property, plant and equipment 112 105  
Loss on disposal 190 18  
Intangible assets, beginning 25,630 22,693 25,725
Other in progress      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 16,149 18,485  
Effect of acquisition of control of Costa Oeste and Marumbi 37    
Acquisitions 7,589 6,932  
Capitalizations for intangible in service 9,448 (5,744)  
Amortization of quotas - concession and authorization 0 0  
Amortization of quotas - PIS/Pasep and Cofins credits 0 0  
Transfers to/from property, plant and equipment 1,979 0  
Loss on disposal 373 3,524  
Intangible assets, beginning 15,933 16,149 18,485
Other      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 38,842 44,210  
Effect of acquisition of control of Costa Oeste and Marumbi 37    
Acquisitions 7,589 6,932  
Capitalizations for intangible in service 0 0  
Amortization of quotas - concession and authorization 6,410 (8,809)  
Amortization of quotas - PIS/Pasep and Cofins credits 23 (54)  
Transfers to/from property, plant and equipment 2,091 105  
Loss on disposal 563 3,542  
Intangible assets, beginning R$ 41,563 R$ 38,842 R$ 44,210