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34 Operating Segments (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
NET OPERATING REVENUE R$ 18,633,249    
Net operating revenues - third-parties 18,633,249    
Net operating revenues - between segments    
OPERATING COSTS AND EXPENSES (14,573,530)    
Energy purchased for resale (6,829,530)    
Charges for use of the main transmission grid (1,525,567)    
Personnel and management (1,601,895)    
Pension and healthcare plans (228,634)    
Materials and supplies (72,680)    
Raw materials and supplies for generation (404,496)    
Natural gas and supplies for gas business (354,701)    
Third party services (558,041)    
Depreciation and amortization (1,009,913)    
Provision (reversal) for litigations (150,269)    
Impairment of assets 48,111    
Other estimated losses, provisions and reversals (135,136)    
Construction cost (1,417,504)    
Other operating costs and expenses, net (256,475)    
EQUITY IN EARNINGS OF INVESTEES 193,547    
PROFIT (LOSS) BEFORE FINANCIAL      
Operating profit 5,119,537    
Financial income 1,839,668    
Financial expenses (973,397)    
OPERATING PROFIT (LOSS) (1,032,161)    
Income tax and social contribution (1,285,365)    
Net income from continuing operations 3,834,172    
Result of discontinued operations 75,578    
Net income 3,909,750    
Restated [Member]      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE   R$ 15,869,246 R$ 14,550,464
Net operating revenues - third-parties   15,869,246 14,550,464
Net operating revenues - between segments  
OPERATING COSTS AND EXPENSES   (12,673,717) (12,435,170)
Energy purchased for resale   (6,105,274) (6,361,178)
Charges for use of the main transmission grid   (1,249,275) (1,176,780)
Personnel and management   (1,325,382) (1,357,785)
Pension and healthcare plans   (238,326) (243,750)
Materials and supplies   (80,197) (79,994)
Raw materials and supplies for generation   (49,352) (19,729)
Natural gas and supplies for gas business   (585,233) (412,618)
Third party services   (526,008) (481,101)
Depreciation and amortization   (950,728) 696,292
Provision (reversal) for litigations   (243,849) (206,792)
Impairment of assets   120,689 18,920
Other estimated losses, provisions and reversals   (136,892) (93,232)
Construction cost   (1,091,396) (1,052,208)
Other operating costs and expenses, net   (212,494) (272,631)
EQUITY IN EARNINGS OF INVESTEES   106,757 135,888
PROFIT (LOSS) BEFORE FINANCIAL      
Operating profit   3,302,286 2,251,182
Financial income   729,506 797,107
Financial expenses   (1,184,870) (1,210,252)
OPERATING PROFIT (LOSS)   2,846,922 1,838,037
Income tax and social contribution   (675,660) 471,166
Net income from continuing operations   2,171,262 1,366,871
Result of discontinued operations   (108,393) 77,133
Net income   2,062,869 1,444,004
Electricity GET GER [member]      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE 4,030,979 3,368,375 3,007,565
Net operating revenues - third-parties 2,599,807 2,233,367 2,116,875
Net operating revenues - between segments 1,431,172 1,135,008 890,690
OPERATING COSTS AND EXPENSES (2,348,409) (1,659,225) (1,619,431)
Energy purchased for resale (260,650) (262,288) (417,918)
Charges for use of the main transmission grid (489,921) (451,107) (408,347)
Personnel and management (277,905) (217,792) (214,855)
Pension and healthcare plans (38,196) (37,955) (36,379)
Materials and supplies (9,695) (10,987) (11,637)
Raw materials and supplies for generation (415,405) (50,388) (25,367)
Natural gas and supplies for gas business
Third party services (118,562) (108,309) (119,668)
Depreciation and amortization (583,958) (551,576) (353,916)
Provision (reversal) for litigations (53,216) (45,212) 18,059
Impairment of assets 48,111 117,648 22,312
Other estimated losses, provisions and reversals (5,930) 43,207 55,457
Construction cost
Other operating costs and expenses, net (143,082) (84,466) (127,172)
EQUITY IN EARNINGS OF INVESTEES 9,629 14,840 5,514
PROFIT (LOSS) BEFORE FINANCIAL      
Operating profit 1,692,199 1,723,990 1,393,648
Financial income 121,129 80,632 119,196
Financial expenses (408,795) (457,528) (517,832)
OPERATING PROFIT (LOSS) 1,404,533 1,347,094 995,012
Income tax and social contribution (337,564) (289,831) (327,598)
Net income from continuing operations 1,066,969 1,057,263 667,414
Result of discontinued operations
Net income 1,066,969 1,057,263 667,414
Electricity GET TRA [member]      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE 1,186,215 871,510 904,826
Net operating revenues - third-parties 875,240 643,596 680,567
Net operating revenues - between segments 310,975 227,914 224,259
OPERATING COSTS AND EXPENSES (536,968) (479,538) (561,850)
Energy purchased for resale
Charges for use of the main transmission grid
Personnel and management (168,828) (139,662) (147,139)
Pension and healthcare plans (23,972) (25,027) (25,884)
Materials and supplies (3,466) (3,766) (5,054)
Raw materials and supplies for generation
Natural gas and supplies for gas business
Third party services (24,863) (38,092) (33,489)
Depreciation and amortization 11,812 (12,987) (11,386)
Provision (reversal) for litigations (24,529) (24,398) 7,879
Impairment of assets
Other estimated losses, provisions and reversals (4,149) (41,350) (49,486)
Construction cost (255,578) (175,220) (277,259)
Other operating costs and expenses, net (19,771) (19,036) (20,032)
EQUITY IN EARNINGS OF INVESTEES 176,848 85,752 123,676
PROFIT (LOSS) BEFORE FINANCIAL      
Operating profit 826,095 477,724 466,652
Financial income 21,977 20,637 29,163
Financial expenses (97,417) (138,947) (136,455)
OPERATING PROFIT (LOSS) 750,655 359,414 359,360
Income tax and social contribution (149,962) (54,695) (75,361)
Net income from continuing operations 600,693 304,719 283,999
Result of discontinued operations
Net income 600,693 304,719 283,999
Electric energy DIS [member]      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE 12,363,459 10,401,301 9,972,442
Net operating revenues - third-parties 12,312,047 10,352,690 9,932,267
Net operating revenues - between segments 51,412 48,611 40,175
OPERATING COSTS AND EXPENSES (10,674,981) (9,579,915) (9,474,473)
Energy purchased for resale (5,856,372) (5,424,207) (5,577,719)
Charges for use of the main transmission grid (1,370,814) (1,044,135) (1,012,062)
Personnel and management (994,037) (822,772) (837,728)
Pension and healthcare plans (146,422) (155,784) (159,842)
Materials and supplies (58,196) (64,419) (60,379)
Raw materials and supplies for generation
Natural gas and supplies for gas business
Third party services (405,854) (397,390) (339,399)
Depreciation and amortization (374,851) (343,597) (301,581)
Provision (reversal) for litigations (55,118) (164,705) (222,057)
Impairment of assets
Other estimated losses, provisions and reversals (123,980) (137,680) (77,985)
Construction cost (1,154,488) (904,023) (741,855)
Other operating costs and expenses, net (134,849) (121,203) (143,866)
EQUITY IN EARNINGS OF INVESTEES
PROFIT (LOSS) BEFORE FINANCIAL      
Operating profit 1,688,478 821,386 497,969
Financial income 1,334,983 355,152 335,377
Financial expenses (291,002) (273,909) (308,319)
OPERATING PROFIT (LOSS) 2,732,459 902,629 525,027
Income tax and social contribution (878,278) (201,236) (148,244)
Net income from continuing operations 1,854,181 701,393 376,783
Result of discontinued operations
Net income 1,854,181 701,393 376,783
Electric energy Com [member]      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE 2,420,657 1,810,901 1,341,162
Net operating revenues - third-parties 2,323,825 1,773,765 1,341,162
Net operating revenues - between segments 96,832 37,136
OPERATING COSTS AND EXPENSES (2,262,053) (1,608,245) (1,354,578)
Energy purchased for resale (2,239,388) (1,590,272) (1,338,473)
Charges for use of the main transmission grid
Personnel and management (15,007) (13,041) (13,734)
Pension and healthcare plans (1,493) (1,481) (1,507)
Materials and supplies (28) (15) (65)
Raw materials and supplies for generation
Natural gas and supplies for gas business
Third party services (1,493) (1,718) (1,700)
Depreciation and amortization (75) (44) (16)
Provision (reversal) for litigations (62) (156) 9
Impairment of assets
Other estimated losses, provisions and reversals (839) (4) (935)
Construction cost
Other operating costs and expenses, net (3,668) (1,514) 1,843
EQUITY IN EARNINGS OF INVESTEES (93) (280) (15)
PROFIT (LOSS) BEFORE FINANCIAL      
Operating profit 158,511 202,376 (13,431)
Financial income 11,469 3,004 6,065
Financial expenses (96) (220) (104)
OPERATING PROFIT (LOSS) 169,884 205,160 (7,470)
Income tax and social contribution (57,947) (69,854) 2,632
Net income from continuing operations 111,937 135,306 (4,838)
Result of discontinued operations
Net income 111,937 135,306 (4,838)
TEL [member]      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE 386,634 418,030 421,408
Net operating revenues - third-parties 355,845 375,030 364,741
Net operating revenues - between segments 30,789 43,000 56,667
OPERATING COSTS AND EXPENSES (363,673) (604,616) (369,201)
Energy purchased for resale
Charges for use of the main transmission grid
Personnel and management (82,817) (73,890) (92,472)
Pension and healthcare plans (11,207) (11,384) (13,892)
Materials and supplies (1,364) (1,955) (1,763)
Raw materials and supplies for generation
Natural gas and supplies for gas business
Third party services (66,426) (87,113) (91,127)
Depreciation and amortization (147,190) (152,863) (58,209)
Provision (reversal) for litigations 336 (14,072) (12,844)
Impairment of assets 54,945
Other estimated losses, provisions and reversals (18,088) (100,691) (12,749)
Construction cost
Other operating costs and expenses, net (91,862) (162,648) (86,145)
EQUITY IN EARNINGS OF INVESTEES
PROFIT (LOSS) BEFORE FINANCIAL      
Operating profit 22,961 (186,586) 52,207
Financial income 24,968 20,760 16,808
Financial expenses (58,317) (53,857) 41,713
OPERATING PROFIT (LOSS) (10,388) (219,683) 27,302
Income tax and social contribution 2,357 68,644 (2,853)
Net income from continuing operations (8,031) (151,039) 24,449
Result of discontinued operations
Net income (8,031) (151,039) 24,449
GAS [member]      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE 535,206 866,884 588,532
Net operating revenues - third-parties 522,328 865,826 582,895
Net operating revenues - between segments 12,878 1,058 5,637
OPERATING COSTS AND EXPENSES (452,495) (662,306) (515,594)
Energy purchased for resale
Charges for use of the main transmission grid
Personnel and management (35,998) (36,932) (34,896)
Pension and healthcare plans (4,663) (4,122) (3,881)
Materials and supplies (580) (217) (2,110)
Raw materials and supplies for generation
Natural gas and supplies for gas business (354,701) (585,233) (412,618)
Third party services (11,633) (12,971) (17,034)
Depreciation and amortization 31,452 (30,480) (22,759)
Provision (reversal) for litigations (85) (292) (154)
Impairment of assets
Other estimated losses, provisions and reversals (238) (1,063) (6,017)
Construction cost (7,438) (12,153) (13,478)
Other operating costs and expenses, net (5,707) 21,157 (2,647)
EQUITY IN EARNINGS OF INVESTEES
PROFIT (LOSS) BEFORE FINANCIAL      
Operating profit 82,711 204,578 72,938
Financial income 13,599 53,625 29,454
Financial expenses (14,363) (10,439) (31,865)
OPERATING PROFIT (LOSS) 81,947 247,764 70,527
Income tax and social contribution (22,967) (74,791) (10,909)
Net income from continuing operations 58,980 172,973 59,618
Result of discontinued operations
Net income 58,980 172,973 59,618
HOL [member]      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE
Net operating revenues - third-parties
Net operating revenues - between segments
OPERATING COSTS AND EXPENSES (107,059) (59,232) (57,993)
Energy purchased for resale
Charges for use of the main transmission grid
Personnel and management (27,303) (21,293) (16,961)
Pension and healthcare plans (2,681) (2,573) (2,365)
Materials and supplies (715) (793) (749)
Raw materials and supplies for generation
Natural gas and supplies for gas business
Third party services (32,025) (16,734) (32,311)
Depreciation and amortization (2,345) (2,289) (1,312)
Provision (reversal) for litigations (17,259) (9,086) (10,528)
Impairment of assets 3,041 1,648
Other estimated losses, provisions and reversals (2) (14,266)
Construction cost
Other operating costs and expenses, net (24,731) (9,503) 18,851
EQUITY IN EARNINGS OF INVESTEES 7,163 6,445 6,713
PROFIT (LOSS) BEFORE FINANCIAL      
Operating profit (99,896) (52,787) (51,280)
Financial income 340,404 217,057 305,344
Financial expenses (165,647) (304,453) (243,169)
OPERATING PROFIT (LOSS) 74,861 (140,183) 10,895
Income tax and social contribution 125,293 (17,563) 41,957
Net income from continuing operations 200,154 (157,746) 52,852
Result of discontinued operations
Net income 200,154 (157,746) 52,852
Reclassifications note 40 [member]      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE (355,843) (375,028) (384,316)
Net operating revenues - third-parties (355,843) (375,028) (384,316)
Net operating revenues - between segments
OPERATING COSTS AND EXPENSES 203,779 486,633 241,451
Energy purchased for resale
Charges for use of the main transmission grid
Personnel and management
Pension and healthcare plans
Materials and supplies 1,364 1,955 1,763
Raw materials and supplies for generation
Natural gas and supplies for gas business
Third party services 66,426 87,113 91,127
Depreciation and amortization 107,497 143,108 52,887
Provision (reversal) for litigations (336) 14,072 12,844
Impairment of assets (54,945)
Other estimated losses, provisions and reversals 18,088 100,691 12,749
Construction cost
Other operating costs and expenses, net 65,685 139,694 70,081
EQUITY IN EARNINGS OF INVESTEES
PROFIT (LOSS) BEFORE FINANCIAL      
Operating profit (152,064) 111,605 (142,865)
Financial income (24,939) (20,735) (16,808)
Financial expenses 58,317 53,857 41,713
OPERATING PROFIT (LOSS) (118,686) 144,727 (117,960)
Income tax and social contribution 43,108 (36,334) 40,827
Net income from continuing operations (75,578) 108,393 (77,133)
Result of discontinued operations 75,578 (108,393) 77,133
Net income
Intersegment operations [member]      
Disclosure of operating segments [line items]      
NET OPERATING REVENUE (1,934,058) (1,492,727) (1,301,155)
Net operating revenues - third-parties (83,727)
Net operating revenues - between segments (1,934,058) (1,492,727) (1,217,428)
OPERATING COSTS AND EXPENSES 1,968,329 1,492,727 1,276,499
Energy purchased for resale 1,526,880 1,171,493 972,932
Charges for use of the main transmission grid 335,168 245,967 243,629
Personnel and management
Pension and healthcare plans
Materials and supplies
Raw materials and supplies for generation 10,909 1,036 5,638
Natural gas and supplies for gas business
Third party services 36,389 49,206 62,500
Depreciation and amortization (34,273)
Provision (reversal) for litigations
Impairment of assets (5,040)
Other estimated losses, provisions and reversals
Construction cost (19,616)
Other operating costs and expenses, net 24,710 25,025 16,456
EQUITY IN EARNINGS OF INVESTEES
PROFIT (LOSS) BEFORE FINANCIAL      
Operating profit 34,271 (24,656)
Financial income (3,922) (626) (27,492)
Financial expenses 3,923 626 27,492
OPERATING PROFIT (LOSS) 34,272 (24,656)
Income tax and social contribution (9,405) 8,383
Net income from continuing operations 24,867 (16,273)
Result of discontinued operations
Net income R$ 24,867 R$ (16,273)