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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.