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23 Post-employment Benefits (Details 6) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]        
Total liabilities or partially covered R$ 11,820,185 R$ 11,074,608    
Fair value of the plan assets (11,420,196) (10,880,721)    
Plan coverage status 399,989 193,887    
Unrecognized asset 1,092,501 999,512    
Total 1,492,490 1,193,399    
Unified Plan [member]        
Disclosure of defined benefit plans [line items]        
Total liabilities or partially covered 6,760,824 6,638,462 R$ 5,914,764 R$ 5,352,894
Fair value of the plan assets (7,568,268) (7,546,756) (6,290,841)  
Plan coverage status (807,444)      
Unrecognized asset 807,444      
Total      
Plan III [member]        
Disclosure of defined benefit plans [line items]        
Total liabilities or partially covered 3,344,723 3,046,536 2,145,661 1,734,568
Fair value of the plan assets (3,629,780) (3,137,754) (2,178,236)  
Plan coverage status (285,057)      
Unrecognized asset 285,057      
Total      
Assistance Plan [member]        
Disclosure of defined benefit plans [line items]        
Total liabilities or partially covered 1,714,638 1,389,610 1,140,605 R$ 1,035,957
Fair value of the plan assets (222,148) R$ (196,211) R$ (172,991)  
Plan coverage status 1,492,490      
Unrecognized asset      
Total R$ 1,492,490