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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