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23 Post-employment Benefits (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]      
Post-employment benefits R$ 1,493,614 R$ 1,194,936 R$ 968,763
Post-employment benefits, current 69,231 66,004  
Post-employment benefits, noncurrent 1,424,383 1,128,932  
Pension Plans [member]      
Disclosure of defined benefit plans [line items]      
Post-employment benefits 1,124 1,537  
Healthcare Plans [member]      
Disclosure of defined benefit plans [line items]      
Post-employment benefits R$ 1,492,490 R$ 1,193,399