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23 Post-employment Benefits (Details 3)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Inflation P.Y. [member]    
Disclosure of defined benefit plans [line items]    
Nominal rate 4.00% 2.90%
Expected Rate Of Discount/Return P.Y. [member] | Unified Plan Defined Benefit [member]    
Disclosure of defined benefit plans [line items]    
Real rate 2.85% 3.05%
Nominal rate 6.96% 6.04%
Expected Rate Of Discount/Return P.Y. [member] | Unified Plan - Balance [member]    
Disclosure of defined benefit plans [line items]    
Real rate 3.20% 3.20%
Nominal rate 7.33% 6.19%
Expected Rate Of Discount/Return P.Y. [member] | Plan III [member]    
Disclosure of defined benefit plans [line items]    
Real rate 3.40% 3.20%
Nominal rate 7.54% 6.19%
Expected Rate Of Discount/Return P.Y. [member] | Assistance Plan [member]    
Disclosure of defined benefit plans [line items]    
Real rate 3.20% 3.30%
Nominal rate 7.33% 6.30%
Salary Growth [member] | Plan III [member]    
Disclosure of defined benefit plans [line items]    
Real rate 1.00% 1.00%
Nominal rate 5.04% 3.93%
Salary Growth [member] | Unified Plan [member]    
Disclosure of defined benefit plans [line items]    
Real rate 0.00% 1.00%
Nominal rate 4.00% 3.93%
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