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Regulatory charges - Schedule of Research Development and Innovation (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of information about amounts recognised in relation to regulatory deferral account balances [line items] |  |  |  |
beginning of period | R$ 164 |  | R$ 138 |
Additions | 108 |  | 135 |
Expenses | (71) |  | (93) |
Investments | (56) |  | (32) |
Monetary updating | 16 |  | 16 |
balances at end of period | 161 |  | 164 |
FNDCT |  |  |  |
Disclosure of information about amounts recognised in relation to regulatory deferral account balances [line items] |  |  |  |
beginning of period | 9 |  | 8 |
Additions | 48 |  | 63 |
Expenses | (47) |  | (62) |
Investments |  |  |  |
Monetary updating |  |  |  |
balances at end of period | 10 |  | 9 |
MME |  |  |  |
Disclosure of information about amounts recognised in relation to regulatory deferral account balances [line items] |  |  |  |
beginning of period | 5 |  | 4 |
Additions | 24 |  | 32 |
Expenses | (24) |  | (31) |
Investments |  |  |  |
Monetary updating |  |  |  |
balances at end of period | 5 |  | 5 |
R&D |  |  |  |
Disclosure of information about amounts recognised in relation to regulatory deferral account balances [line items] |  |  |  |
beginning of period | 150 | [1] | 126 |
Additions | 36 |  | 40 |
Expenses |  |  |  |
Investments | (56) |  | (32) |
Monetary updating | 16 |  | 16 |
balances at end of period | R$ 146 |  | R$ 150 | [1]
[1] | The changes in R&D are presented net of services in progress, which amounted to R$3 on December 31, 2024 and R$6 on December 31, 2022.

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