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34. Operating Segments (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]      
NET OPERATING REVENUE R$ 14,934,780 R$ 14,024,573 R$ 13,101,753
Net operating revenues - third-parties 14,934,780 14,024,573 13,101,753
Net operating revenues - between segments 0 0 0
OPERATING COSTS AND EXPENSES (12,676,621) (11,984,931) (11,279,346)
Energy purchased for resale (6,361,178) (6,165,450) (4,685,604)
Charges for use of the main transmission grid (1,176,780) (712,030) (866,243)
Personnel and management (1,357,785) (1,343,344) (1,304,418)
Pension and healthcare plans (243,750) (237,597) (259,767)
Materials and supplies (81,757) (83,124) (81,463)
Raw materials and supplies for generation (19,729) (97,360) (33,352)
Natural gas and supplies for gas business (412,618) (309,542) (325,413)
Third party services (572,227) (521,515) (550,493)
Depreciation and amortization (749,179) (731,599) (708,296)
Provision/reversal for litigations (219,636) (386,373) 21,408
Impairment of assets 18,920 122,782 (581,577)
Other estimated losses, provisions and reversals (105,981) (101,948) (208,527)
Construction cost (1,052,208) (1,003,881) (1,280,745)
Other operating costs and expenses (342,713) (413,950) (414,856)
EQUITY IN EARNINGS OF INVESTEES 135,888 101,739 166,411
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX 2,394,047 2,141,381 1,988,818
Financial income 813,915 699,310 903,936
Financial expenses (1,251,965) (1,447,750) (1,498,592)
OPERATING PROFIT (LOSS) 1,955,997 1,392,941 1,394,162
Income tax and social contribution (511,993) (274,686) (519,690)
Net income (loss) 1,444,004 1,118,255 874,472
Electricity GET GER      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE 3,007,565 3,176,811 2,927,680
Net operating revenues - third-parties 2,116,875 2,851,644 2,618,869
Net operating revenues - between segments 890,690 325,167 308,811
OPERATING COSTS AND EXPENSES (1,619,431) (1,868,390) (2,032,767)
Energy purchased for resale (417,918) (390,019) (92,050)
Charges for use of the main transmission grid (408,347) (352,958) (322,849)
Personnel and management (214,855) (218,456) (208,887)
Pension and healthcare plans (36,379) (38,782) (43,251)
Materials and supplies (11,637) (12,463) (12,768)
Raw materials and supplies for generation (25,367) (102,719) (77,797)
Natural gas and supplies for gas business 0 0 0
Third party services (119,668) (120,993) (157,602)
Depreciation and amortization (353,916) (368,987) (369,352)
Provision/reversal for litigations 18,059 (39,733) (1,086)
Impairment of assets 22,312 3,886 (494,098)
Other estimated losses, provisions and reversals 55,457 (9,397) (30,700)
Construction cost 0 0 0
Other operating costs and expenses (127,172) (217,769) (222,327)
EQUITY IN EARNINGS OF INVESTEES 5,514 (5,777) (55,284)
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX 1,393,648 1,302,644 894,913
Financial income 124,793 73,433 130,077
Financial expenses (523,429) (565,837) (617,341)
OPERATING PROFIT (LOSS) 995,012 810,240 407,649
Income tax and social contribution (327,598) (191,899) (205,027)
Net income (loss) 667,414 618,341 202,622
Electricity GET TRA      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE 904,826 819,623 1,491,547
Net operating revenues - third-parties 680,567 640,199 1,406,335
Net operating revenues - between segments 224,259 179,424 85,212
OPERATING COSTS AND EXPENSES (561,850) (546,510) (605,202)
Energy purchased for resale 0 0 0
Charges for use of the main transmission grid 0 0 0
Personnel and management (147,139) (122,515) (116,966)
Pension and healthcare plans (25,884) (22,733) (24,171)
Materials and supplies (5,054) (4,732) (5,017)
Raw materials and supplies for generation 0 0 0
Natural gas and supplies for gas business 0 0 0
Third party services (33,489) (24,609) (24,030)
Depreciation and amortization (11,386) (7,201) (3,697)
Provision/reversal for litigations 7,879 (81,210) (9,234)
Impairment of assets 0 0 0
Other estimated losses, provisions and reversals (49,486) 1,107 (975)
Construction cost (277,259) (272,216) (406,345)
Other operating costs and expenses (20,032) (12,401) (14,767)
EQUITY IN EARNINGS OF INVESTEES 185,145 93,145 117,970
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX 528,121 366,258 1,004,315
Financial income 29,163 13,313 21,339
Financial expenses (136,455) (123,707) (108,538)
OPERATING PROFIT (LOSS) 420,829 255,864 917,116
Income tax and social contribution (75,361) (30,515) (220,512)
Net income (loss) 345,468 225,349 696,604
Electric Energy DIS      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE 9,972,442 9,358,664 8,344,765
Net operating revenues - third-parties 9,932,267 9,324,633 8,313,141
Net operating revenues - between segments 40,175 34,031 31,624
OPERATING COSTS AND EXPENSES (9,474,473) (9,071,359) (8,502,377)
Energy purchased for resale (5,577,719) (5,717,970) (4,893,230)
Charges for use of the main transmission grid (1,012,062) (554,805) (642,753)
Personnel and management (837,728) (822,963) (804,974)
Pension and healthcare plans (159,842) (154,285) (163,329)
Materials and supplies (60,379) (60,320) (59,178)
Raw materials and supplies for generation 0 0 0
Natural gas and supplies for gas business 0 0 0
Third party services (339,399) (347,393) (348,479)
Depreciation and amortization (301,581) (285,835) (274,180)
Provision/reversal for litigations (222,057) (168,600) (128,899)
Impairment of assets 0 0 0
Other estimated losses, provisions and reversals (77,985) (83,916) (171,045)
Construction cost (741,855) (717,351) (849,275)
Other operating costs and expenses (143,866) (157,921) (167,035)
EQUITY IN EARNINGS OF INVESTEES 0 0 0
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX 497,969 287,305 (157,612)
Financial income 335,377 380,597 396,880
Financial expenses (308,319) (343,540) (401,863)
OPERATING PROFIT (LOSS) 525,027 324,362 (162,595)
Income tax and social contribution (148,244) 22,893 (17,851)
Net income (loss) 376,783 347,255 (180,446)
TEL      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE 421,408 380,550 325,115
Net operating revenues - third-parties 364,741 306,473 258,794
Net operating revenues - between segments 56,667 74,077 66,321
OPERATING COSTS AND EXPENSES (369,201) (286,363) (241,848)
Energy purchased for resale 0 0 0
Charges for use of the main transmission grid 0 0 0
Personnel and management (92,472) (107,874) (101,397)
Pension and healthcare plans (13,892) (14,800) (18,827)
Materials and supplies (1,763) (2,978) (2,044)
Raw materials and supplies for generation 0 0 0
Natural gas and supplies for gas business 0 0 0
Third party services (91,127) (67,612) (46,552)
Depreciation and amortization (58,209) (39,553) (34,645)
Provision/reversal for litigations (12,844) (3,648) (4,653)
Impairment of assets 0 0 0
Other estimated losses, provisions and reversals (12,749) (8,309) (2,598)
Construction cost 0 0 0
Other operating costs and expenses (86,145) (41,589) (31,132)
EQUITY IN EARNINGS OF INVESTEES 0 0 0
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX 52,207 94,187 83,267
Financial income 16,808 11,828 13,489
Financial expenses (41,713) (30,691) (23,100)
OPERATING PROFIT (LOSS) 27,302 75,324 73,656
Income tax and social contribution (2,853) (21,272) (15,324)
Net income (loss) 24,449 54,052 58,332
GAS      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE 588,532 515,563 542,822
Net operating revenues - third-parties 582,895 510,010 498,376
Net operating revenues - between segments 5,637 5,553 44,446
OPERATING COSTS AND EXPENSES (515,594) (309,213) (534,817)
Energy purchased for resale 0 0 0
Charges for use of the main transmission grid 0 0 0
Personnel and management (34,896) (35,761) (32,765)
Pension and healthcare plans (3,881) (3,577) (3,596)
Materials and supplies (2,110) (1,936) (1,768)
Raw materials and supplies for generation 0 0 0
Natural gas and supplies for gas business (412,618) (309,542) (325,413)
Third party services (17,034) (22,670) (20,082)
Depreciation and amortization (22,759) (28,753) (25,251)
Provision/reversal for litigations (154) 854 (1,036)
Impairment of assets 0 123,586 (87,479)
Other estimated losses, provisions and reversals (6,017) (1,433) (3,209)
Construction cost (13,478) (14,314) (25,125)
Other operating costs and expenses (2,647) (15,667) (9,093)
EQUITY IN EARNINGS OF INVESTEES 0 0 0
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX 72,938 206,350 8,005
Financial income 29,454 38,821 13,551
Financial expenses (31,865) (64,433) (14,973)
OPERATING PROFIT (LOSS) 70,527 180,738 6,583
Income tax and social contribution (10,909) (66,785) (1,632)
Net income (loss) 59,618 113,953 4,951
COM      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE 1,341,162 664,495  
Net operating revenues - third-parties 1,341,162 664,495  
Net operating revenues - between segments 0 0  
OPERATING COSTS AND EXPENSES (1,354,578) (654,445)  
Energy purchased for resale (1,338,473) (654,026)  
Charges for use of the main transmission grid 0 0  
Personnel and management (13,734) (12,993)  
Pension and healthcare plans (1,507) (1,415)  
Materials and supplies (65) (27)  
Raw materials and supplies for generation 0 0  
Natural gas and supplies for gas business 0 0  
Third party services (1,700) (1,280)  
Depreciation and amortization (16) (9)  
Provision/reversal for litigations 9 (156)  
Impairment of assets 0 0  
Other estimated losses, provisions and reversals (935) 0  
Construction cost 0 0  
Other operating costs and expenses 1,843 15,461  
EQUITY IN EARNINGS OF INVESTEES (15) (564)  
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX (13,431) 9,486  
Financial income 6,065 6,515  
Financial expenses (104) (322)  
OPERATING PROFIT (LOSS) (7,470) 15,679  
Income tax and social contribution 2,632 (2,638)  
Net income (loss) (4,838) 13,041  
HOL      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE 0 0 6,238
Net operating revenues - third-parties 0 0 6,238
Net operating revenues - between segments 0 0 0
OPERATING COSTS AND EXPENSES (57,993) (139,784) 101,251
Energy purchased for resale 0 0 (9,119)
Charges for use of the main transmission grid 0 0 0
Personnel and management (16,961) (22,782) (39,429)
Pension and healthcare plans (2,365) (2,005) (6,593)
Materials and supplies (749) (668) (688)
Raw materials and supplies for generation 0 0 0
Natural gas and supplies for gas business 0 0 0
Third party services (32,311) (15,089) (26,755)
Depreciation and amortization (1,312) (1,261) (1,171)
Provision/reversal for litigations (10,528) (93,880) 166,316
Impairment of assets 1,648 (4,690) 0
Other estimated losses, provisions and reversals (14,266) 0 0
Construction cost 0 0 0
Other operating costs and expenses 18,851 591 18,690
EQUITY IN EARNINGS OF INVESTEES 6,713 14,935 103,725
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX (51,280) (124,849) 211,214
Financial income 305,344 186,660 331,646
Financial expenses (243,169) (331,077) (335,823)
OPERATING PROFIT (LOSS) 10,895 (269,266) 207,037
Income tax and social contribution 41,957 (15,530) 59,344
Net income (loss) 52,852 (253,736) 147,693
Intersegment operations      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE (1,301,155) (891,133) (536,414)
Net operating revenues - third-parties (83,727) (272,881) 0
Net operating revenues - between segments (1,217,428) (618,252) (536,414)
OPERATING COSTS AND EXPENSES 1,276,499 891,133 536,414
Energy purchased for resale 972,932 596,565 308,795
Charges for use of the main transmission grid 243,629 195,733 99,359
Personnel and management 0 0 0
Pension and healthcare plans 0 0 0
Materials and supplies 0 0 0
Raw materials and supplies for generation 5,638 5,359 44,445
Natural gas and supplies for gas business 0 0 0
Third party services 62,501 78,131 73,007
Depreciation and amortization 0 0 0
Provision/reversal for litigations 0 0 0
Impairment of assets (5,040) 0 0
Other estimated losses, provisions and reversals 0 0 0
Construction cost (19,616) 0 0
Other operating costs and expenses 16,455 15,345 10,808
EQUITY IN EARNINGS OF INVESTEES 0 0 0
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX (24,656) 0 0
Financial income (33,089) (11,857) (3,046)
Financial expenses 33,089 11,857 3,046
OPERATING PROFIT (LOSS) (24,656) 0 0
Income tax and social contribution 8,383 0 0
Net income (loss) R$ (16,273) R$ 0 R$ 0