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23 Post-employment Benefits (Details 5)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Unified Plan [member]    
Disclosure of defined benefit plans [line items]    
Retired participants life expectancy 12 years 4 months 17 days 13 years 1 month 17 days
Pensioner participants life expectancy 14 years 25 days 8 years 4 months 24 days
Plan III [member]    
Disclosure of defined benefit plans [line items]    
Retired participants life expectancy 23 years 1 month 28 days 25 years 10 months 2 days
Pensioner participants life expectancy 24 years 11 months 23 days 25 years 10 months 2 days