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23 Post-employment benefits (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]    
Actuarial gain R$ 186,628 R$ 58,354
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 66 years 7 months 6 days  
Pension Plans [Member]    
Disclosure of defined benefit plans [line items]    
Average age of inactive participants 65 years 10 months 24 days  
Plan III [Member]    
Disclosure of defined benefit plans [line items]    
Surplus R$ 91,218 32,732
Contributions of all active employees 70,564 77,797
Unified Plan [Member]    
Disclosure of defined benefit plans [line items]    
Surplus R$ 908,294 R$ 376,077