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Post-employment Benefits (Details 8) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Unified Plan [Member]    
Disclosure of defined benefit plans [line items]    
Fair value of the plan's assets, beginning balance R$ 7,212,015 R$ 6,625,377
Return estimated for assets 591,774 769,613
Contributions and distributions 30,541 23,868
Benefits paid (559,530) (539,728)
Actuarial gain (losses) (949,846) 333,728
Discontinued Operations balance adjustments   (843)
Fair value of the plan's assets, ending balance 6,324,954 7,212,015
Cost of current service 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]    
Fair value of the plan's assets, beginning balance 3,903,624 3,531,958
Return estimated for assets 321,633 410,062
Contributions and distributions 6,018 9,709
Benefits paid (336,775) (272,584)
Actuarial gain (losses) 456,951 244,140
Discontinued Operations balance adjustments   (19,661)
Fair value of the plan's assets, ending balance 4,351,451 3,903,624
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]    
Fair value of the plan's assets, beginning balance 173,870 165,683
Return estimated for assets 15,030 18,629
Contributions and distributions 96,036 54,782
Benefits paid (96,036) (54,782)
Actuarial gain (losses) 1,028 (10,442)
Discontinued Operations balance adjustments   0
Fair value of the plan's assets, ending balance 189,928 R$ 173,870
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