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34 Operating Segments (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Jan. 02, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]        
NET OPERATING REVENUE   R$ 16,244,274 R$ 14,934,780 R$ 14,024,573
Net operating revenues - third-parties   16,244,274 14,934,780 14,024,573
Net operating revenues - between segments    
OPERATING COSTS AND EXPENSES   (13,160,350) (12,676,621) (11,984,931)
Energy purchased for resale   (6,105,274) (6,361,178) (6,065,450)
Charges for use of the main transmission grid   (1,249,275) (1,176,780) (712,030)
Personnel and management   (1,325,382) (1,357,785) (1,343,344)
Pension and healthcare plans   (238,326) (243,750) (237,597)
Materials and supplies   (82,152) (81,757) (83,124)
Raw materials and supplies for generation   (49,352) (19,729) (97,360)
Natural gas and supplies for gas business   (585,233) (412,618) (309,542)
Third party services   (613,121) (572,227) (521,515)
Depreciation and amortization   (1,093,836) (749,179) (731,599)
Provision (reversal) for litigations   (257,921) (219,636) (386,373)
Impairment of assets   120,689 18,920 122,782
Other estimated losses, provisions and reversals   (237,583) (105,981) (101,948)
Construction cost   (1,091,396) (1,052,208) (1,003,881)
Other operating costs and expenses, net   (458,815) (302,690) (464,316)
EQUITY IN EARNINGS OF INVESTEES   106,757 135,888 101,739
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX   3,190,681 2,394,047 2,141,381
Financial income   750,241 813,915 699,310
Financial expenses   (1,238,727) (1,251,965) (1,447,750)
OPERATING PROFIT (LOSS)   2,702,195 1,955,997 1,392,941
Income tax and social contribution   (639,326) (511,993) (274,686)
Net income (loss) R$ 2,070,551 2,062,869 1,444,004 1,118,255
Electricity GET GER [Member]        
Disclosure of operating segments [line items]        
NET OPERATING REVENUE   3,368,375 3,007,565 3,176,811
Net operating revenues - third-parties   2,233,367 2,116,875 2,851,644
Net operating revenues - between segments   1,135,008 890,690 325,167
OPERATING COSTS AND EXPENSES   (1,659,225) (1,619,431) (1,768,390)
Energy purchased for resale   (262,288) (417,918) (290,019)
Charges for use of the main transmission grid   (451,107) (408,347) (352,958)
Personnel and management   (217,792) (214,855) (218,456)
Pension and healthcare plans   (37,955) (36,379) (38,782)
Materials and supplies   (10,987) (11,637) (12,463)
Raw materials and supplies for generation   (50,388) (25,367) (102,719)
Natural gas and supplies for gas business  
Third party services   (108,309) (119,668) (120,993)
Depreciation and amortization   (551,576) (353,916) (368,987)
Provision (reversal) for litigations   (45,212) 18,059 (39,733)
Impairment of assets   117,648 22,312 3,886
Other estimated losses, provisions and reversals   43,207 55,457 (9,397)
Construction cost    
Other operating costs and expenses, net   (84,466) (127,172) (217,769)
EQUITY IN EARNINGS OF INVESTEES   14,840 5,514 (5,777)
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX   1,723,990 1,393,648 1,302,644
Financial income   80,632 119,196 73,433
Financial expenses   (457,528) (517,832) (565,837)
OPERATING PROFIT (LOSS)   1,347,094 995,012 810,240
Income tax and social contribution   (289,831) (327,598) (191,899)
Net income (loss)   1,057,263 667,414 618,341
Electricity GET TRA [Member]        
Disclosure of operating segments [line items]        
NET OPERATING REVENUE   871,510 904,826 819,623
Net operating revenues - third-parties   643,596 680,567 640,199
Net operating revenues - between segments   227,914 224,259 179,424
OPERATING COSTS AND EXPENSES   (479,538) (561,850) (546,510)
Energy purchased for resale  
Charges for use of the main transmission grid  
Personnel and management   (139,662) (147,139) (122,515)
Pension and healthcare plans   (25,027) (25,884) (22,733)
Materials and supplies   (3,766) (5,054) (4,732)
Raw materials and supplies for generation    
Natural gas and supplies for gas business    
Third party services   (38,092) (33,489) (24,609)
Depreciation and amortization   (12,987) (11,386) (7,201)
Provision (reversal) for litigations   (24,398) 7,879 (81,210)
Impairment of assets    
Other estimated losses, provisions and reversals   (41,350) (49,486) 1,107
Construction cost   (175,220) (277,259) (272,216)
Other operating costs and expenses, net   (19,036) (20,032) (12,401)
EQUITY IN EARNINGS OF INVESTEES   85,752 123,676 93,145
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX   477,724 466,652 366,258
Financial income   20,637 29,163 13,313
Financial expenses   (138,947) (136,455) (123,707)
OPERATING PROFIT (LOSS)   359,414 359,360 255,864
Income tax and social contribution   (54,695) (75,361) (30,515)
Net income (loss)   304,719 283,999 225,349
Electric Energy DIS [Member]        
Disclosure of operating segments [line items]        
NET OPERATING REVENUE   10,401,301 9,972,442 9,358,664
Net operating revenues - third-parties   10,352,690 9,932,267 9,324,633
Net operating revenues - between segments   48,611 40,175 34,031
OPERATING COSTS AND EXPENSES   (9,579,915) (9,474,473) (9,071,359)
Energy purchased for resale   (5,424,207) (5,577,719) (5,717,970)
Charges for use of the main transmission grid   (1,044,135) (1,012,062) (554,805)
Personnel and management   (822,772) (837,728) (822,963)
Pension and healthcare plans   (155,784) (159,842) (154,285)
Materials and supplies   (64,419) (60,379) (60,320)
Raw materials and supplies for generation    
Natural gas and supplies for gas business    
Third party services   (397,390) (339,399) (347,393)
Depreciation and amortization   (343,597) (301,581) (285,835)
Provision (reversal) for litigations   (164,705) (222,057) (168,600)
Impairment of assets    
Other estimated losses, provisions and reversals   (137,680) (77,985) (83,916)
Construction cost   (904,023) (741,855) (717,351)
Other operating costs and expenses, net   (121,203) (143,866) (157,921)
EQUITY IN EARNINGS OF INVESTEES    
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX   821,386 497,969 287,305
Financial income   355,152 335,377 380,597
Financial expenses   (273,909) (308,319) (343,540)
OPERATING PROFIT (LOSS)   902,629 525,027 324,362
Income tax and social contribution   (201,236) (148,244) 22,893
Net income (loss)   701,393 376,783 347,255
Com [Member]        
Disclosure of operating segments [line items]        
NET OPERATING REVENUE   1,810,901 1,341,162 664,495
Net operating revenues - third-parties   1,773,765 1,341,162 664,495
Net operating revenues - between segments   37,136
OPERATING COSTS AND EXPENSES   (1,608,245) (1,354,578) (654,445)
Energy purchased for resale   (1,590,272) (1,338,473) (654,026)
Charges for use of the main transmission grid  
Personnel and management   (13,041) (13,734) (12,993)
Pension and healthcare plans   (1,481) (1,507) (1,415)
Materials and supplies   (15) (65) (27)
Raw materials and supplies for generation    
Natural gas and supplies for gas business    
Third party services   (1,718) (1,700) (1,280)
Depreciation and amortization   (44) (16) (9)
Provision (reversal) for litigations   (156) 9 (156)
Impairment of assets    
Other estimated losses, provisions and reversals   (4) (935)
Construction cost    
Other operating costs and expenses, net   (1,514) 1,843 15,461
EQUITY IN EARNINGS OF INVESTEES   (280) (15) (564)
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX   202,376 (13,431) 9,486
Financial income   3,004 6,065 6,515
Financial expenses   (220) (104) (322)
OPERATING PROFIT (LOSS)   205,160 (7,470) 15,679
Income tax and social contribution   (69,854) 2,632 (2,638)
Net income (loss)   135,306 (4,838) 13,041
TEL [Member]        
Disclosure of operating segments [line items]        
NET OPERATING REVENUE   418,030 421,408 380,550
Net operating revenues - third-parties   375,030 364,741 306,473
Net operating revenues - between segments   43,000 56,667 74,077
OPERATING COSTS AND EXPENSES   (604,616) (369,201) (286,363)
Energy purchased for resale  
Charges for use of the main transmission grid  
Personnel and management   (73,890) (92,472) (107,874)
Pension and healthcare plans   (11,384) (13,892) (14,800)
Materials and supplies   (1,955) (1,763) (2,978)
Raw materials and supplies for generation    
Natural gas and supplies for gas business    
Third party services   (87,113) (91,127) (67,612)
Depreciation and amortization   (152,863) (58,209) (39,553)
Provision (reversal) for litigations   (14,072) (12,844) (3,648)
Impairment of assets    
Other estimated losses, provisions and reversals   (100,691) (12,749) (8,309)
Construction cost    
Other operating costs and expenses, net   (162,648) (86,145) (41,589)
EQUITY IN EARNINGS OF INVESTEES    
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX   (186,586) 52,207 94,187
Financial income   20,760 16,808 11,828
Financial expenses   (53,857) (41,713) (30,691)
OPERATING PROFIT (LOSS)   (219,683) 27,302 75,324
Income tax and social contribution   68,644 (2,853) (21,272)
Net income (loss)   (151,039) 24,449 54,052
GAS [Member]        
Disclosure of operating segments [line items]        
NET OPERATING REVENUE   866,884 588,532 515,563
Net operating revenues - third-parties   865,826 582,895 510,010
Net operating revenues - between segments   1,058 5,637 5,553
OPERATING COSTS AND EXPENSES   (662,306) (515,594) (309,213)
Energy purchased for resale  
Charges for use of the main transmission grid  
Personnel and management   (36,932) (34,896) (35,761)
Pension and healthcare plans   (4,122) (3,881) (3,577)
Materials and supplies   (217) (2,110) (1,936)
Raw materials and supplies for generation    
Natural gas and supplies for gas business   (585,233) (412,618) (309,542)
Third party services   (12,971) (17,034) (22,670)
Depreciation and amortization   (30,480) (22,759) (28,753)
Provision (reversal) for litigations   (292) (154) 854
Impairment of assets     123,586
Other estimated losses, provisions and reversals   (1,063) (6,017) (1,433)
Construction cost   (12,153) (13,478) (14,314)
Other operating costs and expenses, net   21,157 (2,647) (15,667)
EQUITY IN EARNINGS OF INVESTEES    
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX   204,578 72,938 206,350
Financial income   53,625 29,454 38,821
Financial expenses   (10,439) (31,865) (64,433)
OPERATING PROFIT (LOSS)   247,764 70,527 180,738
Income tax and social contribution   (74,791) (10,909) (66,785)
Net income (loss)   172,973 59,618 113,953
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   (59,232) (57,993) (139,784)
Energy purchased for resale  
Charges for use of the main transmission grid  
Personnel and management   (21,293) (16,961) (22,782)
Pension and healthcare plans   (2,573) (2,365) (2,005)
Materials and supplies   (793) (749) (668)
Raw materials and supplies for generation    
Natural gas and supplies for gas business    
Third party services   (16,734) (32,311) (15,089)
Depreciation and amortization   (2,289) (1,312) (1,261)
Provision (reversal) for litigations   (9,086) (10,528) (93,880)
Impairment of assets   3,041 1,648 (4,690)
Other estimated losses, provisions and reversals   (2) (14,266)
Construction cost    
Other operating costs and expenses, net   (9,503) 18,851 591
EQUITY IN EARNINGS OF INVESTEES   6,445 6,713 14,935
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX   (52,787) (51,280) (124,849)
Financial income   217,057 305,344 186,660
Financial expenses   (304,453) (243,169) (331,077)
OPERATING PROFIT (LOSS)   (140,183) 10,895 (269,266)
Income tax and social contribution   (17,563) 41,957 15,530
Net income (loss)   (157,746) 52,852 (253,736)
Intersegment Operations [Member]        
Disclosure of operating segments [line items]        
NET OPERATING REVENUE   (1,492,727) (1,301,155) (891,133)
Net operating revenues - third-parties     (83,727) (272,881)
Net operating revenues - between segments   (1,492,727) (1,217,428) (618,252)
OPERATING COSTS AND EXPENSES   1,492,727 1,276,499 891,133
Energy purchased for resale   1,171,493 972,932 596,565
Charges for use of the main transmission grid   245,967 243,629 195,733
Personnel and management    
Pension and healthcare plans    
Materials and supplies    
Raw materials and supplies for generation   1,036 5,638 5,359
Natural gas and supplies for gas business    
Third party services   49,206 62,501 78,131
Depreciation and amortization    
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   25,025 16,455 15,345
EQUITY IN EARNINGS OF INVESTEES    
PROFIT (LOSS) BEFORE FINANCIAL INCOME AND TAX     (24,656)
Financial income   (626) (27,492) (11,857)
Financial expenses   R$ 626 27,492 11,857
OPERATING PROFIT (LOSS)     (24,656)
Income tax and social contribution     8,383
Net income (loss)     R$ (16,273)