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Post-employment Benefits (Details 8) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Unified Plan [Member]    
IfrsStatementLineItems [Line Items]    
Cost of current service R$ (17,705)  
Estimated cost of interest 590,697  
Expected return on plan assets (591,774)  
Costs (income or loss) (18,782)  
Unified Plan [Member]    
IfrsStatementLineItems [Line Items]    
Fair value of the plan's assets, beginning balance 6,625,377 R$ 6,799,255
Return estimated for assets 769,613 743,845
Contributions and distributions 23,868 29,808
Benefits paid (539,728) (523,792)
Actuarial gain (losses) 333,728 (423,739)
Discontinued Operations balance adjustments (843)  
Fair value of the plan's assets, ending balance 7,212,015  
PlanIII [member]    
IfrsStatementLineItems [Line Items]    
Fair value of the plan's assets, beginning balance 3,531,958 3,347,204
Return estimated for assets 410,062 274,486
Contributions and distributions 9,709 151,606
Benefits paid (272,584) (264,096)
Actuarial gain (losses) 244,140 22,758
Discontinued Operations balance adjustments (19,661)  
Fair value of the plan's assets, ending balance 3,903,624  
Cost of current service 10,105  
Estimated cost of interest 321,264  
Expected return on plan assets (321,683)  
Costs (income or loss) 9,686  
Assistance Plan [Member]    
IfrsStatementLineItems [Line Items]    
Fair value of the plan's assets, beginning balance 165,683 196,909
Return estimated for assets 18,629 26,390
Contributions and distributions 54,782
Benefits paid (54,782)
Actuarial gain (losses) (10,442) R$ (57,616)
Discontinued Operations balance adjustments  
Fair value of the plan's assets, ending balance 173,870  
Cost of current service 8,100  
Estimated cost of interest 140,975  
Expected return on plan assets (15,030)  
Costs (income or loss) R$ 134,045