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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
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.