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Post-employment Benefits (Details 8) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Unified Plan [Member]    
IfrsStatementLineItems [Line Items]    
Fair value of the plan's assets, beginning balance R$ 6,799,255 R$ 7,568,268
Return estimated for assets 743,845 837,120
Contributions and distributions 29,808 26,661
Benefits paid (523,792) (511,621)
Actuarial gain (losses) (423,739) (1,121,173)
Fair value of the plan's assets, ending balance 6,625,377  
Plan I I I [Member]    
IfrsStatementLineItems [Line Items]    
Fair value of the plan's assets, beginning balance 3,347,204 3,629,780
Return estimated for assets 274,486 133,837
Contributions and distributions 151,606 136,730
Benefits paid (264,096) (233,908)
Actuarial gain (losses) 22,758 (319,235)
Fair value of the plan's assets, ending balance 3,531,958  
Assistance Plan [Member]    
IfrsStatementLineItems [Line Items]    
Fair value of the plan's assets, beginning balance 196,909 222,148
Return estimated for assets 26,390 6,366
Contributions and distributions  
Benefits paid  
Actuarial gain (losses) (57,616) R$ (31,605)
Fair value of the plan's assets, ending balance R$ 165,683