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Operating Costs and Expenses - Schedule of Other Operating Expenses (Revenues), Net (Parenthetical) (Details) - BRL (R$)
R$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Wrote off of financial asset R$ 172 R$ 172
Sale of investments   319 R$ 52
Baguari Energia [Member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Sale of investments   261    
Retiro Baixo [Member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Sale of investments   27    
M E S A [Member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Sale of investments   R$ 31