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23 Post-employment benefits (Details 5)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Unified Plan [Member]    
Disclosure of defined benefit plans [line items]    
Retired participants life expectancy 13 years 1 month 17 days 14 years 4 months 13 days
Pensioner participants life expectancy 8 years 5 months 24 days 15 years 8 months 5 days
Plan III [Member]    
Disclosure of defined benefit plans [line items]    
Retired participants life expectancy 25 years 10 months 2 days 22 years 9 months 26 days
Pensioner participants life expectancy 25 years 10 months 2 days 27 years 2 months 16 days