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Regulatory charges - Schedule of Research Development and Innovation (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure of information about amounts recognised in relation to regulatory deferral account balances [line items] |  |
beginning of period | R$ 138 | R$ 125
Additions | 135 | 108
Expenses | (93) | (75)
Investments | (32) | (32)
Monetary updating | 16 | 12
balances at end of period | 164 | 138
FNDCT |  |
Disclosure of information about amounts recognised in relation to regulatory deferral account balances [line items] |  |
beginning of period | 8 | 9
Additions | 63 | 49
Expenses | (62) | (50)
balances at end of period | 9 | 8
MME |  |
Disclosure of information about amounts recognised in relation to regulatory deferral account balances [line items] |  |
beginning of period | 4 | 4
Additions | 32 | 25
Expenses | (31) | (25)
balances at end of period | 5 | 4
R&D |  |
Disclosure of information about amounts recognised in relation to regulatory deferral account balances [line items] |  |
beginning of period | 126 | 112
Additions | 40 | 34
Investments | (32) | (32)
Monetary updating | 16 | 12
balances at end of period | R$ 150 | R$ 126

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