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Post-employment Benefits (Details 6) - BRL (R$)
R$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Total liabilities or partially covered R$ 10,721,838 R$ 10,973,812  
Fair value of the plan assets (10,323,018) (10,343,368)  
Plan coverage status 398,820 630,444  
Unrecognized asset 670,268 663,765  
Total 1,069,088 1,294,209  
Unified Plan [Member]      
IfrsStatementLineItems [Line Items]      
Total liabilities or partially covered 6,029,530 6,145,601 R$ 6,760,824
Fair value of the plan assets (6,625,377)    
Plan coverage status (595,847)    
Unrecognized asset 595,847    
Total    
Plan I I I [Member]      
IfrsStatementLineItems [Line Items]      
Total liabilities or partially covered 3,457,537 3,337,093 3,344,723
Fair value of the plan assets (3,531,958)    
Plan coverage status (74,421)    
Unrecognized asset 74,421    
Total    
Assistance Plan [Member]      
IfrsStatementLineItems [Line Items]      
Total liabilities or partially covered 1,234,771 R$ 1,491,118 R$ 1,714,637
Fair value of the plan assets (165,683)    
Plan coverage status 1,069,088    
Unrecognized asset    
Total R$ 1,069,088