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18 Intangible Assets (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning R$ 6,029,097    
Effect of acquisition of control of Costa Oeste and Marumbi   R$ 66,775  
Loss on disposal 26,789 28,742 R$ 42,740
Intangible assets, ending 6,332,611 6,029,097  
Distribution Concession Agreement in Service [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 8,212,792 7,907,965  
Acquisitions    
Incorporations 2,625    
Amortization of quotas - concession and authorization [1] (461,370) (431,963)  
Amortization of quotas - PIS/Pasep and Cofins credits (10,740) (10,813)  
Loss on disposal (26,359) (28,098)  
Provision for claims added to the cost of the works    
Transfers to other receivables (1,520)    
Transfers to investments (7)    
Transfers to contract assets  
Transfers from contract assets 771,844 775,701  
Intangible assets, ending 8,487,265 8,212,792 7,907,965
Distribution Concession Agreement Special Liabilities in Service [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning (2,822,729) (2,845,438)  
Incorporations (2,550)    
Amortization of quotas - concession and authorization [1] (134,864) 130,388  
Amortization of quotas - PIS/Pasep and Cofins credits  
Loss on disposal    
Transfers to contract assets  
Transfers from contract assets (93,164) (107,679)  
Intangible assets, ending (2,783,579) (2,822,729) (2,845,438)
Distribution Concession Agreement in Progress [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 714,446  
Capitalizations for intangible in service    
Amortization of quotas - concession and authorization  
Amortization of quotas - PIS/Pasep and Cofins credits  
Loss on disposal  
Customers contributions    
Transfers to contract assets   (714,446)  
Transfers from contract assets    
Intangible assets, ending 714,446
Distribution Concession Agreement Special Liabilities in Progress [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning (26,100)  
Capitalizations for intangible in service    
Amortization of quotas - concession and authorization  
Amortization of quotas - PIS/Pasep and Cofins credits  
Loss on disposal  
Customers contributions    
Transfers to contract assets (26,100)  
Transfers from contract assets    
Intangible assets, ending (26,100)
Distribution Concession Agreement [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 5,390,063 5,750,873  
Incorporations 75    
Capitalizations for intangible in service    
Amortization of quotas - concession and authorization [1] (326,506) (301,575)  
Amortization of quotas - PIS/Pasep and Cofins credits (10,740) (10,813)  
Loss on disposal (26,359) (28,098)  
Transfers to other receivables (1,520)    
Transfers to investments (7)    
Transfers to contract assets   (688,346)  
Transfers from contract assets 678,680 668,022  
Intangible assets, ending 5,703,686 5,390,063 5,750,873
Generation Concession Agreement in Service [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 226,411 236,443  
Capitalizations for intangible in service   7,279  
Amortization of quotas - concession and authorization [2] (16,944) (17,311)  
ANEEL grant - use of public property    
Business combination (Note 1.2)  
Intangible assets, ending 209,467 226,411 236,443
Generation Concession Agreement in Progress [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 6,977 [3]  
Amortization of quotas - concession and authorization [3]  
ANEEL grant - use of public property [3]    
Business combination (Note 1.2)  
Intangible assets, ending [3] 6,977 [3]
Generation Concession Agreement Concession Authorization Rights [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 367,441 375,801  
Amortization of quotas - concession and authorization [2] (31,294) (13,205)  
ANEEL grant - use of public property    
Business combination (Note 1.2) 20,113 4,845  
Intangible assets, ending 582,671 367,441 375,801
Generation Concession Agreement [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 593,852 619,221  
Amortization of quotas - concession and authorization [2] (14,350) (30,516)  
ANEEL grant - use of public property   302  
Business combination (Note 1.2) 20,113 4,845  
Intangible assets, ending 582,671 593,852 619,221
Gas Distribution in Service [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 3,619 24,417  
Acquisitions    
Transfers from property, plant and equipment 24,835    
Capitalizations for intangible in service 10,011 2,042 [1]  
Amortization of quotas - concession and authorization (28,454) [1] (22,759)  
Loss on disposal   (81)  
Transfers to contract assets    
Intangible assets, ending 3,619 24,417
Gas Distribution in Progress [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 19,471  
Acquisitions    
Capitalizations for intangible in service [1]  
Amortization of quotas - concession and authorization [1]    
Loss on disposal  
Transfers to contract assets (19,471)  
Transfers from contract assets    
Intangible assets, ending 19,471
Gas Distribution [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 3,619 43,888  
Transfers from property, plant and equipment 24,835    
Capitalizations for intangible in service    
Amortization of quotas - concession and authorization (28,454) [1] (22,759)  
Loss on disposal   (81)  
Transfers to contract assets   (19,471)  
Transfers from contract assets   2,042  
Intangible assets, ending 3,619 43,888
Other in Service [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 25,630 22,693  
Acquisitions  
Transfers from property, plant and equipment (1,471) 112  
Capitalizations for intangible in service 16,118 9,448  
Amortization of quotas - concession and authorization 8,646 (6,410) [4]  
Amortization of quotas - PIS/Pasep and Cofins credits (11) (23)  
Loss on disposal (190)  
Intangible assets, ending 31,620 25,630 22,693
Other in Progress [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 15,933 16,149  
Acquisitions 5,032 7,589  
Transfers from property, plant and equipment 10,217 1,979  
Capitalizations for intangible in service (16,118) (9,448)  
Amortization of quotas - concession and authorization [4]  
Amortization of quotas - PIS/Pasep and Cofins credits  
Loss on disposal (430) (373)  
Intangible assets, ending 14,634 15,933 16,149
Other      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets, beginning 41,563 38,842  
Acquisitions 5,032 7,589  
Transfers from property, plant and equipment 8,746 2,091  
Capitalizations for intangible in service  
Amortization of quotas - concession and authorization (8,646) (6,410) [4]  
Amortization of quotas - PIS/Pasep and Cofins credits (11) (23)  
Loss on disposal (430) (563)  
Intangible assets, ending R$ 46,254 R$ 41,563 R$ 38,842
[1] Amortization during the concession as of the start of commercial operations of the enterprises or based on the useful life of the assets, of the two the shortest.
[2] Amortization during the concession/authorization as of the start of commercial operations of the enterprises.
[3] Includes the balances of use of public asset and hydrological risk renegotiation
[4] Annual amortization rate: 20%.