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Concession Financial and Sector Assets and Liabilities - Schedule of Sector Financial Assets and Liabilities Net (Details)
R$ in Millions
 12 Months Ended
Dec. 31, 2023
BRL (R$)
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Beginning Balance R$ 944
Sectorial Financial Assets, Additions 2,851
Sectorial Financial Assets, Amortization (3,915)
Sectorial Financial Assets, Remuneration 465
Sectorial Financial Assets, Transfer 460 [1]
Sectorial Financial Assets, Ending Balance 805
Sectorial Financial Assets, Amortization 89
Sectorial Financial Assets, Constitution 716
Sectorial Financial Assets, Current 493
Sectorial Financial Assets, Non-current 312
Sectorial Financial Liabilities Additions During the Year (2,435)
Sectorial Financial Liabilities, Amortization 3,288
Sectorial Financial Liabilities, Remuneration (390)
Sectorial Financial Liabilities, Transfer (463) [1]
Sectorial Financial Assets and Liabilities Net, Beginning Balance 944
Sectorial Financial Assets and Liabilities Net, Additions 416
Sectorial Financial Assets and Liabilities Net, Amortization (627)
Sectorial Financial Assets and Liabilities Net, Remuneration 75
Sectorial Financial Assets and Liabilities Net, Transfer (3) [1]
Sectorial Financial Assets and Liabilities Net, Ending Balance 805
Sectorial Financial Assets and Liabilities Net, Amortization 89
Sectorial Financial Assets and Liabilities Net, Constitution 716
Sectorial Financial Assets and Liabilities Net, Current 493
Sectorial Financial Assets and Liabilities Net, Non-current 312
CVA Assets [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Beginning Balance (345)
Sectorial Financial Assets, Additions 1,597
Sectorial Financial Assets, Amortization (2,527)
Sectorial Financial Assets, Remuneration 260
Sectorial Financial Assets, Transfer 330 [1]
Sectorial Financial Assets, Ending Balance (685)
Sectorial Financial Assets, Amortization (434)
Sectorial Financial Assets, Constitution (251)
Sectorial Financial Assets, Current (584)
Sectorial Financial Assets, Non-current (101)
Energy aquisition (CVA energy) [Member] | CVA Assets [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Beginning Balance (1,787)
Sectorial Financial Assets, Additions 1,213
Sectorial Financial Assets, Amortization (1,223)
Sectorial Financial Assets, Remuneration 161
Sectorial Financial Assets, Transfer 527 [1]
Sectorial Financial Assets, Ending Balance (1,109)
Sectorial Financial Assets, Amortization (443)
Sectorial Financial Assets, Constitution (666)
Sectorial Financial Assets, Current (837)
Sectorial Financial Assets, Non-current (272)
Itaipu Energy Costs [Member] | CVA Assets [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Beginning Balance 594
Sectorial Financial Assets, Additions (40)
Sectorial Financial Assets, Amortization (455)
Sectorial Financial Assets, Remuneration 44
Sectorial Financial Assets, Transfer (114) [1]
Sectorial Financial Assets, Ending Balance 29
Sectorial Financial Assets, Amortization 143
Sectorial Financial Assets, Constitution (114)
Sectorial Financial Assets, Current 75
Sectorial Financial Assets, Non-current (46)
Program of Incentives for Alternative Electricity Sources - PROINFA [Member] | CVA Assets [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Beginning Balance 31
Sectorial Financial Assets, Amortization (42)
Sectorial Financial Assets, Remuneration 1
Sectorial Financial Assets, Transfer (10) [1]
Sectorial Financial Assets, Ending Balance (20)
Sectorial Financial Assets, Amortization (19)
Sectorial Financial Assets, Constitution (1)
Sectorial Financial Assets, Current (20)
Transport Basic Charges [Member] | CVA Assets [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Beginning Balance 215
Sectorial Financial Assets, Additions 388
Sectorial Financial Assets, Amortization (265)
Sectorial Financial Assets, Remuneration 40
Sectorial Financial Assets, Transfer 35 [1]
Sectorial Financial Assets, Ending Balance 413
Sectorial Financial Assets, Amortization 114
Sectorial Financial Assets, Constitution 299
Sectorial Financial Assets, Current 291
Sectorial Financial Assets, Non-current 122
Transport of Itaipu Supply [Member] | CVA Assets [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Beginning Balance 18
Sectorial Financial Assets, Additions 60
Sectorial Financial Assets, Amortization (20)
Sectorial Financial Assets, Remuneration 4
Sectorial Financial Assets, Transfer 5 [1]
Sectorial Financial Assets, Ending Balance 67
Sectorial Financial Assets, Amortization 14
Sectorial Financial Assets, Constitution 53
Sectorial Financial Assets, Current 45
Sectorial Financial Assets, Non-current 22
System Service Charges - ESS [Member] | CVA Assets [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Beginning Balance 583
Sectorial Financial Assets, Additions (24)
Sectorial Financial Assets, Amortization (380)
Sectorial Financial Assets, Remuneration 7
Sectorial Financial Assets, Transfer (248) [1]
Sectorial Financial Assets, Ending Balance (62)
Sectorial Financial Assets, Amortization (242)
Sectorial Financial Assets, Constitution 180
Sectorial Financial Assets, Current (136)
Sectorial Financial Assets, Non-current 74
CDE [Member] | CVA Assets [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Beginning Balance 1
Sectorial Financial Assets, Amortization (142)
Sectorial Financial Assets, Remuneration 3
Sectorial Financial Assets, Transfer 135 [1]
Sectorial Financial Assets, Ending Balance (3)
Sectorial Financial Assets, Amortization (1)
Sectorial Financial Assets, Constitution (2)
Sectorial Financial Assets, Current (2)
Sectorial Financial Assets, Non-current (1)
Other Sectoral Financial Assets [Member] | CVA Assets [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Beginning Balance 1,289
Sectorial Financial Assets, Additions 1,254
Sectorial Financial Assets, Amortization (1,388)
Sectorial Financial Assets, Remuneration 205
Sectorial Financial Assets, Transfer 130 [1]
Sectorial Financial Assets, Ending Balance 1,490
Sectorial Financial Assets, Amortization 523
Sectorial Financial Assets, Constitution 967
Sectorial Financial Assets, Current 1,077
Sectorial Financial Assets, Non-current 413
Quotas from Nuclear Energy [Member] | CVA Assets [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Beginning Balance 105
Sectorial Financial Assets, Additions 103
Sectorial Financial Assets, Amortization (86)
Sectorial Financial Assets, Remuneration 16
Sectorial Financial Assets, Ending Balance 138
Sectorial Financial Assets, Amortization 51
Sectorial Financial Assets, Constitution 87
Sectorial Financial Assets, Current 102
Sectorial Financial Assets, Non-current 36
Neutrality of Parcel A [Member] | CVA Assets [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Beginning Balance 203
Sectorial Financial Assets, Additions 168
Sectorial Financial Assets, Amortization (51)
Sectorial Financial Assets, Remuneration 5
Sectorial Financial Assets, Transfer 61 [1]
Sectorial Financial Assets, Ending Balance 386
Sectorial Financial Assets, Amortization (29)
Sectorial Financial Assets, Constitution 415
Sectorial Financial Assets, Current 363
Sectorial Financial Assets, Non-current 23
Energy Over Contracting [Member] | CVA Assets [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Beginning Balance 750 [2]
Sectorial Financial Assets, Additions 643 [2]
Sectorial Financial Assets, Amortization (529) [2]
Sectorial Financial Assets, Remuneration 58 [2]
Sectorial Financial Assets, Ending Balance 922 [2]
Sectorial Financial Assets, Amortization 349 [2]
Sectorial Financial Assets, Constitution 573 [2]
Sectorial Financial Assets, Current 688 [2]
Sectorial Financial Assets, Non-current 234 [2]
Tariff Refunds [Member] | CVA Assets [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Beginning Balance (71)
Sectorial Financial Assets, Transfer (17) [1]
Sectorial Financial Assets, Ending Balance (88)
Sectorial Financial Assets, Amortization (25)
Sectorial Financial Assets, Constitution (63)
Sectorial Financial Assets, Current (67)
Sectorial Financial Assets, Non-current (21)
Other [Member] | CVA Assets [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Beginning Balance 302
Sectorial Financial Assets, Additions 340
Sectorial Financial Assets, Amortization (722)
Sectorial Financial Assets, Remuneration 126
Sectorial Financial Assets, Transfer 86 [1]
Sectorial Financial Assets, Ending Balance 132
Sectorial Financial Assets, Amortization 177
Sectorial Financial Assets, Constitution (45)
Sectorial Financial Assets, Current (9)
Sectorial Financial Assets, Non-current 141
CVA Liabilities [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Liabilities Additions During the Year (1,706)
Sectorial Financial Liabilities, Amortization 2,380
Sectorial Financial Liabilities, Remuneration (343)
Sectorial Financial Liabilities, Transfer (331) [1]
CVA Liabilities [Member] | Energy aquisition (CVA energy) [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Liabilities Additions During the Year (1,179)
Sectorial Financial Liabilities, Amortization 1,941
Sectorial Financial Liabilities, Remuneration (234)
Sectorial Financial Liabilities, Transfer (528) [1]
CVA Liabilities [Member] | Itaipu Energy Costs [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Additions (109)
Sectorial Financial Liabilities, Remuneration (5)
Sectorial Financial Liabilities, Transfer 114 [1]
CVA Liabilities [Member] | Program of Incentives for Alternative Electricity Sources - PROINFA [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Additions (31)
Sectorial Financial Liabilities, Amortization 25
Sectorial Financial Liabilities, Remuneration (4)
Sectorial Financial Liabilities, Transfer 10 [1]
CVA Liabilities [Member] | Transport Basic Charges [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Liabilities, Amortization 35
Sectorial Financial Liabilities, Transfer (35) [1]
CVA Liabilities [Member] | Transport of Itaipu Supply [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Liabilities, Amortization 5
Sectorial Financial Liabilities, Transfer (5) [1]
CVA Liabilities [Member] | System Service Charges - ESS [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Liabilities Additions During the Year (506)
Sectorial Financial Liabilities, Amortization 371
Sectorial Financial Liabilities, Remuneration (113)
Sectorial Financial Liabilities, Transfer 248 [1]
CVA Liabilities [Member] | CDE [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Assets, Additions 119
Sectorial Financial Liabilities, Amortization 3
Sectorial Financial Liabilities, Remuneration 13
Sectorial Financial Liabilities, Transfer (135) [1]
CVA Liabilities [Member] | Other Sectoral Financial Liabilities [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Liabilities Additions During the Year (729)
Sectorial Financial Liabilities, Amortization 908
Sectorial Financial Liabilities, Remuneration (47)
Sectorial Financial Liabilities, Transfer (132) [1]
CVA Liabilities [Member] | Neutrality of Parcel A [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Liabilities Additions During the Year (58)
Sectorial Financial Liabilities, Amortization 124
Sectorial Financial Liabilities, Remuneration (5)
Sectorial Financial Liabilities, Transfer (61) [1]
CVA Liabilities [Member] | Tariff Refunds [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Liabilities Additions During the Year (88)
Sectorial Financial Liabilities, Amortization 73
Sectorial Financial Liabilities, Remuneration (2)
Sectorial Financial Liabilities, Transfer 17 [1]
CVA Liabilities [Member] | Other [Member]  
Disclosure of detailed information about service concession arrangements [line items]  
Sectorial Financial Liabilities Additions During the Year (583)
Sectorial Financial Liabilities, Amortization 711
Sectorial Financial Liabilities, Remuneration (40)
Sectorial Financial Liabilities, Transfer R$ (88) [1]
[1] In addition to the transfers between sectoral financial assets and liabilities, there was a transfer of R$1,550 to the "Other assets" group.
[2] Reversal of the over contracting amounts passed on to consumers in the 2018 and 2019 tariff adjustments because they were previously recognized by ANEEL as involuntary over contracting, made possible by the publication of the involuntariness orders, recognizing over contracting as voluntary. Regarding the amount constituted in the period, there is a high volume of surplus energy, mainly due to the growing increase in the energy injected by MMGD facilities, settled at a low PLD.