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Income and Social Contribution Taxes - Schedule of Deferred Income Tax and Social Contribution Tax (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Movement of deferred income tax and social contribution      
Deferred tax assets, Balance at beginning of period R$ 4,424 R$ 4,819  
Deferred tax liabilities, Balance at beginning of period (2,491) (2,631)  
Deferred tax assets (liabilities), Balance at beginning of period 1,933 2,188  
Profit and loss (744) (142)  
Comprehensive income (394) (119)  
Others (5) 6  
Deferred tax assets, Balance at end of period 3,601 4,424  
Deferred tax liabilities, Balance at end of period (2,811) (2,491)  
Deferred tax assets (liabilities), Balance at end of period 790 1,933  
Total assets 2,334 3,045 R$ 3,120
Total liabilities (1,543) (1,112) R$ (932)
Deferred tax assets      
Movement of deferred income tax and social contribution      
Profit and loss (429) (282)  
Comprehensive income (394) (119)  
Others 6  
Deferred tax assets, Tax loss carryforwards      
Movement of deferred income tax and social contribution      
Deferred tax assets, Balance at beginning of period 1,219 987  
Profit and loss (263) 232  
Comprehensive income  
Others  
Deferred tax assets, Balance at end of period 956 1,219  
Deferred tax assets, Provisions for contingencies      
Movement of deferred income tax and social contribution      
Deferred tax assets, Balance at beginning of period 723 602  
Profit and loss (104) 121  
Comprehensive income  
Others  
Deferred tax assets, Balance at end of period 619 723  
Deferred tax assets, Impairment on investments      
Movement of deferred income tax and social contribution      
Deferred tax assets, Balance at beginning of period 57 56  
Profit and loss (40) 1  
Comprehensive income  
Others  
Deferred tax assets, Balance at end of period 17 57  
Deferred tax assets, Fair value of derivative financial instruments (PUT SAAG)      
Movement of deferred income tax and social contribution      
Deferred tax assets, Balance at beginning of period 229  
Profit and loss   (229)  
Comprehensive income    
Others    
Deferred tax assets, Balance at end of period    
Deferred tax assets, Provision related to the exclusion of ICMS from the PIS/Pasep and Cofins calculation basis      
Movement of deferred income tax and social contribution      
Deferred tax assets, Balance at beginning of period 88 598  
Profit and loss (88) (510)  
Comprehensive income  
Others  
Deferred tax assets, Balance at end of period 88  
Deferred tax assets, Provision for income sharing payments      
Movement of deferred income tax and social contribution      
Deferred tax assets, Balance at beginning of period 48 30  
Profit and loss (18) 18  
Comprehensive income  
Others  
Deferred tax assets, Balance at end of period 30 48  
Deferred tax assets, Post-employment obligations      
Movement of deferred income tax and social contribution      
Deferred tax assets, Balance at beginning of period 1,812 1,852  
Profit and loss 47 79  
Comprehensive income (394) (119)  
Others  
Deferred tax assets, Balance at end of period 1,465 1,812  
Deferred tax assets, Provision for expected credit losses      
Movement of deferred income tax and social contribution      
Deferred tax assets, Balance at beginning of period 326 319  
Profit and loss 24 7  
Comprehensive income  
Others  
Deferred tax assets, Balance at end of period 350 326  
Deferred tax assets, Onerous concession      
Movement of deferred income tax and social contribution      
Deferred tax assets, Balance at beginning of period 12 12  
Profit and loss  
Comprehensive income  
Others  
Deferred tax assets, Balance at end of period 12 12  
Deferred tax assets, Rights of use      
Movement of deferred income tax and social contribution      
Deferred tax assets, Balance at beginning of period 126 117  
Profit and loss 8 9  
Comprehensive income  
Others  
Deferred tax assets, Balance at end of period 134 126  
Deferred tax assets, Others      
Movement of deferred income tax and social contribution      
Deferred tax assets, Balance at beginning of period 13 17  
Profit and loss 5 (10)  
Comprehensive income  
Others 6  
Deferred tax assets, Balance at end of period 18 13  
Deferred tax liabilities      
Movement of deferred income tax and social contribution      
Profit and loss (315) 140  
Comprehensive income  
Others (5)  
Deferred tax liabilities, Deemed cost      
Movement of deferred income tax and social contribution      
Deferred tax liabilities, Balance at beginning of period (155) (156)  
Profit and loss 8 1  
Comprehensive income  
Others  
Deferred tax liabilities, Balance at end of period (147) (155)  
Deferred tax liabilities, Acquisition costs of equity interests      
Movement of deferred income tax and social contribution      
Deferred tax liabilities, Balance at beginning of period (439) (456)  
Profit and loss 100 17  
Comprehensive income  
Others  
Deferred tax liabilities, Balance at end of period (339) (439)  
Deferred tax liabilities, Borrowing costs capitalized      
Movement of deferred income tax and social contribution      
Deferred tax liabilities, Balance at beginning of period (182) (170)  
Profit and loss (17) (12)  
Comprehensive income  
Others  
Deferred tax liabilities, Balance at end of period (199) (182)  
Deferred tax liabilities, Adjustment to expectation of cash flow – Concession assets      
Movement of deferred income tax and social contribution      
Deferred tax liabilities, Balance at beginning of period (334) (263)  
Profit and loss (53) (71)  
Comprehensive income  
Others  
Deferred tax liabilities, Balance at end of period (387) (334)  
Deferred tax liabilities, Revenues arising from transmission contract asset      
Movement of deferred income tax and social contribution      
Deferred tax liabilities, Balance at beginning of period (931) (940)  
Profit and loss (469) 9  
Comprehensive income  
Others  
Deferred tax liabilities, Balance at end of period (1,400) (931)  
Deferred tax liabilities, Adjustment to fair value: Swap/Loss      
Movement of deferred income tax and social contribution      
Deferred tax liabilities, Balance at beginning of period (126) (210)  
Profit and loss 125 84  
Comprehensive income  
Others  
Deferred tax liabilities, Balance at end of period (1) (126)  
Deferred tax liabilities, Reimbursement of costs – GSF      
Movement of deferred income tax and social contribution      
Deferred tax liabilities, Balance at beginning of period (229) (274)  
Profit and loss 45 45  
Comprehensive income  
Others  
Deferred tax liabilities, Balance at end of period (184) (229)  
Deferred tax liabilities, Lease liabilities      
Movement of deferred income tax and social contribution      
Deferred tax liabilities, Balance at beginning of period (127) (108)  
Profit and loss 8 (19)  
Comprehensive income  
Others  
Deferred tax liabilities, Balance at end of period (119) (127)  
Deferred tax liabilities, Others      
Movement of deferred income tax and social contribution      
Deferred tax liabilities, Balance at beginning of period 32 (54)  
Profit and loss (62) 86  
Comprehensive income  
Others (5)  
Deferred tax liabilities, Balance at end of period R$ (35) R$ 32