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Schedule of participants and beneficiaries (Details) - Number
Number in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Unified Plan [Member]    
IfrsStatementLineItems [Line Items]    
Number of active participants 18 22
Number of inactive participants 4,229 4,274
Number of dependent people  
Total 4,247 4,296
Plan I I I [Member]    
IfrsStatementLineItems [Line Items]    
Number of active participants 6,645 7,401
Number of inactive participants 5,018 4,646
Number of dependent people  
Total 11,663 12,047
Assistance Plan [Member]    
IfrsStatementLineItems [Line Items]    
Number of active participants 6,276 6,546
Number of inactive participants 8,910 9,032
Number of dependent people 21,621 21,716
Total 36,807 37,294