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23 Post-employment Benefits (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Variable Income [member]    
Disclosure of defined benefit plans [line items]    
Legal limit 70.00%  
Healthcare Plan [member]    
Disclosure of defined benefit plans [line items]    
Average age of inactive participants 68 years 1 month 6 days  
Pension Plans [member]    
Disclosure of defined benefit plans [line items]    
Average age of inactive participants 67 years 2 months 12 days  
Plan III [member]    
Disclosure of defined benefit plans [line items]    
Surplus R$ 91,218  
Contributions of all active employees 67,515 R$ 70,564
Unified Plan [member]    
Disclosure of defined benefit plans [line items]    
Surplus R$ 908,294