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Financial Instruments and Risk Management - Schedule of Financial Instruments and Fair Value (Details) - BRL (R$) R$ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of financial assets [line items] |  |
Financial assets | R$ 6,540 | R$ 5,993
Financial liabilities at amortised cost, class [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | (13,920) | (14,590)
Financial assets at fair value | (13,920) | (14,590)
Financial liabilities at fair value through profit or loss, category [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | (763)
Financial assets at fair value | 0 | (763)
Derivative Financial Instruments [Member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | (13,920) | (15,353)
Financial assets at fair value | (13,920) | (15,353)
Derivative Financial Instrument Assets Swaps [Member] | Level 3 of fair value hierarchy [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 368 | 703
Financial assets at fair value | 368 | 703
Derivative Financial Instrument Assets Swaps [Member] | Level 3 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 0 | (91)
Financial assets at fair value | 0 | (91)
Concession Of Distribution Infrastructure [Member] | Level 3 of fair value hierarchy [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,920 | 1,407
Financial assets at fair value | 1,920 | 1,407
Indemnifiable Receivable Generation [Member] | Level 3 of fair value hierarchy [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 784 | 691
Financial assets at fair value | 784 | 691
Loans and debentures [member] | Financial liabilities at amortised cost, class [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | (9,831) | (10,581)
Financial assets at fair value | (9,831) | (10,581)
Debt With Pension Fund Forluz [Member] | Financial liabilities at amortised cost, class [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | (90) | (251)
Financial assets at fair value | (90) | (251)
Deficit Of Pension fund Forluz [Member] | Financial liabilities at amortised cost, class [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | (521) | (545)
Financial assets at fair value | (521) | (545)
Concessions Payable [Member] | Financial liabilities at amortised cost, class [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | (28) | (27)
Financial assets at fair value | (28) | (27)
Suppliers [Member] | Financial liabilities at amortised cost, class [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | (3,017) | (2,832)
Financial assets at fair value | (3,017) | (2,832)
Leasing Transactions [Member] | Financial liabilities at amortised cost, class [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | (433) | (354)
Financial assets at fair value | (433) | (354)
Derivative Financial Instruments Put Options [Member] | Financial liabilities at fair value through profit or loss, category [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets |  | (672)
Financial assets at fair value |  | (672)
Financial assets at amortised cost, class [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 9,369 | 10,483
Financial assets at fair value | 9,369 | 10,483
Financial assets at amortised cost, class [member] | Securities Cash Investments One [Member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 11 | 380
Financial assets at fair value | 11 | 380
Financial assets at amortised cost, class [member] | Accounts Receivable From Customers And Traders Concession Holders Transmission Service [Member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,477 | 4,812
Financial assets at fair value | 5,477 | 4,812
Financial assets at amortised cost, class [member] | Restricted Cash [Member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 31 | 16
Financial assets at fair value | 31 | 16
Financial assets at amortised cost, class [member] | Accounts Receivable From The State Of Minas Gerais [Member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 13 | 13
Financial assets at fair value | 13 | 13
Financial assets at amortised cost, class [member] | Concession Financial Assets C V A Account And Other Financial Components [Member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 806 | 944
Financial assets at fair value | 806 | 944
Financial assets at amortised cost, class [member] | Low Income Subsidy [Member] |  |
Disclosure of financial assets [line items] |  |
Financial assets |  | 1,207
Financial assets at fair value | 0 | 1,207
Financial assets at amortised cost, class [member] | Concession Grant Fee Generation Concessions [Member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 3,031 | 2,950
Financial assets at fair value | 3,031 | 2,950
Financial assets at amortised cost, class [member] | Agreement Between F I P Melbourne And A G Par [Member] |  |
Disclosure of financial assets [line items] |  |
Financial assets |  | 161
Financial assets at fair value | 0 | 161
Financial assets at fair value through profit or loss, category [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 14,546 | 16,129
Financial assets at fair value | 14,546 | 16,129
Financial assets at fair value through profit or loss, category [member] | Cash Equivalents Investments [Member] | Level 2 of fair value hierarchy [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 1,342 | 1,346
Financial assets at fair value | 1,342 | 1,346
Financial assets at fair value through profit or loss, category [member] | Bank Certificates Of Deposit [Member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 74 | 191
Financial assets at fair value | 74 | 191
Financial assets at fair value through profit or loss, category [member] | Bank Financial Notes [Member] | Level 2 of fair value hierarchy [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 475 | 906
Financial assets at fair value | 475 | 906
Financial assets at fair value through profit or loss, category [member] | Marketable securities - treasury financial notes [member] | Level 1 of fair value hierarchy [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 214 | 402
Financial assets at fair value | 214 | 402
Marketable Securities [Member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 2,105 | 2,845
Financial assets at fair value | 2,105 | 2,845
Derivative Financial Instrument [Member] |  |
Disclosure of financial assets [line items] |  |
Financial assets | 5,177 | 5,646
Financial assets at fair value | R$ 5,177 | R$ 5,646

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