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Cash and Cash Equivalents - Schedule of Cash and Cash Equivalents (Details) - BRL (R$) R$ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of detailed information about borrowings [table] |  |  |
Bank accounts | R$ 269 |  | R$ 195
Cash equivalents |  |  |
Bank certificates of deposit (CDBs) | 1,470 |  | 991
Overnight | 159 |  | 351
Short term investments | 1,629 |  | 1,342
Cash and cash equivalents | R$ 1,898 |  | R$ 1,537
Bottom of Range [Member] |  |  |
Cash equivalents |  |  |
Accrued interest rate of return used to reflect time value of money, regulatory deferral account balances | 80.00% | [1] | 80.00%
Pre-fixed rate of return used to reflect time value of money, regulatory deferral account balances | 11.91% | [2] | 11.42%
Top of Range [Member] |  |  |
Cash equivalents |  |  |
Accrued interest rate of return used to reflect time value of money, regulatory deferral account balances | 111.00% |  | 112.00%
Pre-fixed rate of return used to reflect time value of money, regulatory deferral account balances | 12.15% |  | 11.65%
[1] | For these CDBs, the Company and its subsidiaries have repurchase transactions which state, on their trading notes, the bank’s commitment to repurchase the security, on demand, on the maturity date of the transaction, or earlier.
[2] | They consist of short-term investments, available for redemption on the following day. They are usually backed by Treasury Bills, Notes or Bonds and referenced to a pre-fixed rate. Their purpose is to settle the short-term obligations of the Company and its subsidiaries, or to be used in the acquisition of other assets with better return to replenish the portfolio.

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_45&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B13 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_i&doctype=Standard -URIDate 2024-03-27 + Details
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