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16 Investments (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning R$ 2,368,234 R$ 2,570,643 [1]
Equity 106,757 135,888
Investment/advance for future capital increase 267,471 87,781
Capital decrease (35,035) (35,280)
Amortization (372) (373)
Proposed dividends and JCP (49,613) (46,715)
Transfers (134,263)  
Effects of applying new IFRS   (148,748)
Other [2]   (194,962)
Investments, ending 2,523,179 2,368,234
Associates [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 48,928 54,918
Equity 24,414 23,165
Investment/advance for future capital increase 123 9
Capital decrease (735)
Amortization  
Proposed dividends and JCP (21,731) (28,737)
Transfers  
Effects of applying new IFRS  
Other [2]   (427)
Investments, ending 50,999 48,928
Investment Property [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 1,342 1,362
Equity  
Investment/advance for future capital increase  
Capital decrease  
Amortization   (5)
Proposed dividends and JCP  
Effects of applying new IFRS  
Other [2]   (15)
Investments, ending   1,342
Other investments [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 1,342 1,362
Equity
Investment/advance for future capital increase 142
Capital decrease
Amortization (5)
Proposed dividends and JCP
Transfers (524)  
Effects of applying new IFRS  
Other [2]  
Investments, ending 813 1,342
Advance for Future Capital Future Capital Increase [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 142  
Equity 133,597  
Investment/advance for future capital increase  
Capital decrease  
Amortization  
Proposed dividends and JCP  
Transfers (133,739)  
Investments, ending 142
Dona Francisca Energetica [Member] | Associates [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 29,144 29,821
Equity 9,853 9,989
Investment/advance for future capital increase
Capital decrease
Amortization
Proposed dividends and JCP (10,574) (10,666)
Transfers  
Effects of applying new IFRS  
Other [2]  
Investments, ending 28,423 29,144
Foz Do Chopim Energetica [Member] | Associates [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 8,227 13,084
Equity 13,924 13,214
Investment/advance for future capital increase
Capital decrease
Amortization
Proposed dividends and JCP (9,976) (18,071)
Transfers  
Effects of applying new IFRS  
Other [2]  
Investments, ending 12,175 8,227
Domino Holdings [Member] | Associates [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 2,442 2,457
Equity (280) (15)
Investment/advance for future capital increase
Capital decrease (735)
Amortization
Proposed dividends and JCP (1,181)
Transfers  
Effects of applying new IFRS  
Other [2]  
Investments, ending 246 2,442
Others [Member] | Associates [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 9,115 9,556
Equity 917 (23)
Investment/advance for future capital increase 123 9
Capital decrease
Amortization
Proposed dividends and JCP
Transfers  
Effects of applying new IFRS  
Other [2]   (427)
Investments, ending 10,155 9,115
Joint Ventures [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 2,317,822 2,514,363
Equity 82,343 112,723
Investment/advance for future capital increase 133,751 87,630
Capital decrease (34,300) (35,280)
Amortization (367) (368)
Proposed dividends and JCP (27,882) (17,978)
Transfers  
Effects of applying new IFRS   (148,748)
Other [2]   (194,520)
Investments, ending 2,471,367 2,317,822
Joint Ventures [Member] | Voltalia Sao Miguel Do Gostoso I [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 110,568 74,998
Equity (3,409) (3,964)
Investment/advance for future capital increase 2,940 39,534
Capital decrease
Amortization
Proposed dividends and JCP
Transfers  
Effects of applying new IFRS  
Other [2]  
Investments, ending 110,099 110,568
Joint Ventures [Member] | Voltalia Sao Miguel Do Gostoso - Authorization Rights [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning   10,773
Equity  
Investment/advance for future capital increase  
Capital decrease  
Amortization   (368)
Proposed dividends and JCP  
Effects of applying new IFRS  
Other [2]  
Joint Ventures [Member] | Parana Gas [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning   3
Equity   (3)
Investment/advance for future capital increase  
Capital decrease  
Amortization  
Proposed dividends and JCP  
Effects of applying new IFRS  
Other [2]  
Joint Ventures [Member] | Costa Oeste [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning   33,646
Equity   3,041
Investment/advance for future capital increase  
Capital decrease  
Amortization  
Proposed dividends and JCP  
Effects of applying new IFRS  
Other [2]   (36,687)
Joint Ventures [Member] | Marumbi [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning   85,341
Equity   6,971
Investment/advance for future capital increase  
Capital decrease  
Amortization  
Proposed dividends and JCP  
Effects of applying new IFRS  
Other [2]   (92,312)
Joint Ventures [Member] | Transmissora Sul Brasileira [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning   64,360
Equity   1,161
Investment/advance for future capital increase  
Capital decrease  
Amortization  
Proposed dividends and JCP  
Effects of applying new IFRS  
Other [2]   (65,521)
Joint Ventures [Member] | Caiua [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 74,639 56,037
Equity 4,800 5,034
Investment/advance for future capital increase
Capital decrease
Amortization
Proposed dividends and JCP (1,127) (1,324)
Transfers  
Effects of applying new IFRS   14,892
Other [2]  
Investments, ending 78,312 74,639
Joint Ventures [Member] | Integracao Maranhense [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 129,684 113,401
Equity 11,316 9,238
Investment/advance for future capital increase
Capital decrease
Amortization
Proposed dividends and JCP (2,284) (2,022)
Transfers  
Effects of applying new IFRS   9,067
Other [2]  
Investments, ending 138,716 129,684
Joint Ventures [Member] | Matrincha [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 673,216 835,819
Equity 48,634 50,411
Investment/advance for future capital increase
Capital decrease
Amortization
Proposed dividends and JCP (10,323) (9,131)
Transfers  
Effects of applying new IFRS   (203,883)
Other [2]  
Investments, ending 711,527 673,216
Joint Ventures [Member] | Guaraciaba [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 356,941 418,320
Equity 18,312 35,321
Investment/advance for future capital increase
Capital decrease (34,300)
Amortization
Proposed dividends and JCP (3,876) (4,328)
Transfers  
Effects of applying new IFRS   (92,372)
Other [2]  
Investments, ending 337,077 356,941
Joint Ventures [Member] | Paranaiba [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 160,584 162,273
Equity 16,375 (16,510)
Investment/advance for future capital increase
Capital decrease
Amortization
Proposed dividends and JCP (2,986) (2,976)
Transfers  
Effects of applying new IFRS   17,797
Other [2]  
Investments, ending 173,973 160,584
Joint Ventures [Member] | Mata de Santa Genebra [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 484,262 459,374
Equity (41,716) (2,541)
Investment/advance for future capital increase 130,811 48,096
Capital decrease
Amortization
Proposed dividends and JCP 3,264
Transfers  
Effects of applying new IFRS   (23,931)
Other [2]  
Investments, ending 573,357 484,262
Joint Ventures [Member] | Cantareira [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning   200,018
Equity   24,564
Investment/advance for future capital increase  
Capital decrease   (35,280)
Amortization  
Proposed dividends and JCP   (1,461)
Effects of applying new IFRS   129,682
Other [2]  
Joint Ventures [Member] | Voltalia Sao Miguel Do Gostoso - Direito De Autorizacao [Member]    
DisclosureOfInvestmentsLineItems [Line Items]    
Investments, beginning 10,405  
Equity  
Investment/advance for future capital increase  
Capital decrease  
Amortization (367)  
Proposed dividends and JCP  
Transfers  
Investments, ending R$ 10,038 R$ 10,405
[1] As of December 31, 2017, the joint ventures operating in the transmission segment had their electricity transmission concession agreements classified as financial assets within the scope of IAS 39 and IFRIC 12. With the entry into force on January 1, 2018 of IFRS 15, bringing the concept of the right to receive the infrastructure investments conditioned to the fulfillment of performance obligations to operate and maintain the infrastructure and not only by the passage of time, the electricity transmission concession agreements started being classified as contract assets. As a result, the balance of the financial assets of the joint ventures started being classified on January 1, 2018 as contract assets in accordance with the Company's practices, with a reduction in its measurement in the amount of R$148,748 with effect in the Company in the caption Investments, by equity. At the transition, the Company and its joint ventures opted to adopt the standard on the date of initial application as an adjustment to the opening balance, in equity account, considering only agreements outstanding prior to the date of application, as set forth in IFRS 15.
[2] Of the total, the amounts of R$ 36,687 and R$ 92,312 refers to investments that are now subsidiaries; R$ 65,521 refers to investment written off; R$ 427 from the sale of the associated company Dois Saltos Empreendimentos de Gerao de Energia Eltrica Ltda ; and R$ 15 refers to the transfer to Other receivables.