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31 Net Operating Revenue (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of net operating revenue [line items]      
Gross revenues R$ 25,227,782 R$ 23,725,810 R$ 21,574,289
PIS/Pasep and Cofins (2,161,120) (2,117,800) (1,788,714)
ICMS (VAT) (4,656,686) (4,210,382) (3,734,940)
Sectorial charges (2,161,811) 2,457,562 (2,020,674)
Service tax (ISSQN) (3,891) (5,286) (5,388)
Net operating revenues 16,244,274 14,934,780 14,024,573
Electricity Sales To Final Customers [Member]      
Disclosure of net operating revenue [line items]      
Gross revenues 10,481,794 10,104,045 8,689,516
PIS/Pasep and Cofins (965,651)    
ICMS (VAT) (2,336,583)    
Sectorial charges (753,544)    
Service tax (ISSQN)    
Net operating revenues 6,426,016 5,548,584 4,681,533
Electricity Sales To Distributors [Member]      
Disclosure of net operating revenue [line items]      
Gross revenues 3,301,336 3,136,244 3,529,770
PIS/Pasep and Cofins (368,101)    
ICMS (VAT) (10,727)    
Sectorial charges (56,642)    
Service tax (ISSQN)    
Net operating revenues 2,865,866 3,136,244 3,176,354
Use Of The Main Distribution and Transmission Grid [Member]      
Disclosure of net operating revenue [line items]      
Gross revenues 8,270,996 3,469,060 6,442,761
PIS/Pasep and Cofins (781,017)    
ICMS (VAT) (1,999,583)    
Sectorial charges (1,351,625)    
Service tax (ISSQN)    
Net operating revenues 4,138,771   3,617,941
Construction Income [Member]      
Disclosure of net operating revenue [line items]      
Gross revenues 1,132,884 1,097,313 868,001
PIS/Pasep and Cofins    
ICMS (VAT)    
Sectorial charges    
Service tax (ISSQN)    
Net operating revenues 1,132,884 1,097,313 868,001
Fair Value Of Assets From The Indemnity For The Concession [Member]      
Disclosure of net operating revenue [line items]      
Gross revenues 36,646 47,499 57,080
PIS/Pasep and Cofins    
ICMS (VAT)    
Sectorial charges    
Service tax (ISSQN)    
Net operating revenues 36,646 47,499 57,080
Telecommunications [Member]      
Disclosure of net operating revenue [line items]      
Gross revenues 532,926 512,540 426,773
PIS/Pasep and Cofins (21,035)    
ICMS (VAT) (137,896)    
Sectorial charges    
Service tax (ISSQN) (558)    
Net operating revenues 373,437 512,540 308,952
Distribution Of Piped Gas [Member]      
Disclosure of net operating revenue [line items]      
Gross revenues 1,003,790 753,222 621,992
PIS/Pasep and Cofins 11,313    
ICMS (VAT) (171,897)    
Sectorial charges    
Service tax (ISSQN) (23)    
Net operating revenues 843,183 557,186 454,815
Sectorial Financial Assets and Liabilities Result [Member]      
Disclosure of net operating revenue [line items]      
Gross revenues 25,057 985,344 767,040
PIS/Pasep and Cofins (6,426)    
ICMS (VAT)    
Sectorial charges    
Service tax (ISSQN)    
Net operating revenues 18,631 893,688 718,826
Other Operating Revenue [Member]      
Disclosure of net operating revenue [line items]      
Gross revenues 442,353 222,329 171,356
PIS/Pasep and Cofins (30,203)    
ICMS (VAT)    
Sectorial charges    
Service tax (ISSQN) (3,310)    
Net operating revenues R$ 408,840 R$ 189,355 R$ 141,071