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Post-employment Benefits (Details 9)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
BRL (R$)
Unified Plan [Member]  
Disclosure of defined benefit plans [line items]  
Cost of current service R$ (28,169)
Estimated cost of interest 683,706
Expected return on plan assets (685,596)
Costs (income or loss) (30,059)
Plan III [Member]  
Disclosure of defined benefit plans [line items]  
Cost of current service (1,346)
Estimated cost of interest 465,275
Expected return on plan assets (465,632)
Costs (income or loss) (1,703)
Assistance Plan [Member]  
Disclosure of defined benefit plans [line items]  
Cost of current service 7,636
Estimated cost of interest 148,020
Expected return on plan assets (21,273)
Costs (income or loss) R$ 134,383