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23 Post-employment benefits (Details 3)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Inflation P.Y. [Member]    
Disclosure of defined benefit plans [line items]    
Real rate
Nominal rate 2.90% 4.00%
Expected Rate Of Discount/Return P.Y. [Member] | Unified Plan Defined Benefit [Member]    
Disclosure of defined benefit plans [line items]    
Real rate 3.05% 4.60%
Nominal rate 6.04% 8.78%
Expected Rate Of Discount/Return P.Y. [Member] | Unified Plan - Balance [Member]    
Disclosure of defined benefit plans [line items]    
Real rate 3.20% 4.60%
Nominal rate 6.19% 8.78%
Expected Rate Of Discount/Return P.Y. [Member] | Plan III [Member]    
Disclosure of defined benefit plans [line items]    
Real rate 3.20% 4.60%
Nominal rate 6.19% 8.78%
Expected Rate Of Discount/Return P.Y. [Member] | Assistance Plan [Member]    
Disclosure of defined benefit plans [line items]    
Real rate 3.30% 4.60%
Nominal rate 6.30% 8.78%
Salary Growth [Member] | Plan III [Member]    
Disclosure of defined benefit plans [line items]    
Real rate 1.50% 1.50%
Nominal rate 4.44% 5.56%
Salary Growth [Member] | Unified Plan [Member]    
Disclosure of defined benefit plans [line items]    
Real rate 1.00% 2.00%
Nominal rate 3.93% 6.08%
Demographic [Member] | Mortality Table [Member]    
Disclosure of defined benefit plans [line items]    
Nominal assumption AT - 2000 AT - 2000
Demographic [Member] | Mortality Table Of Individuals With Permanent Disability [Member]    
Disclosure of defined benefit plans [line items]    
Nominal assumption WINKLEVOSS WINKLEVOSS
Demographic [Member] | Table Of New Disability Benefit Vested [Member]    
Disclosure of defined benefit plans [line items]    
Nominal assumption TASA 1927 TASA 1927