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24. Post-Employment Benefits (Details 3)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Economic | Inflation p.y.    
Disclosure of defined benefit plans [line items]    
Real rate 0.00% 0.00%
Nominal rate 4.00% 4.50%
Expected rate of discount/return p.y. | Unified Plan    
Disclosure of defined benefit plans [line items]    
Real rate 4.60% 5.11%
Nominal rate 8.78% 9.84%
Expected rate of discount/return p.y. | Plan III    
Disclosure of defined benefit plans [line items]    
Real rate 4.60% 5.24%
Nominal rate 8.78% 9.97%
Expected rate of discount/return p.y. | Assistance Plan    
Disclosure of defined benefit plans [line items]    
Real rate 4.60% 5.20%
Nominal rate 8.78% 9.94%
Expected rate of discount/return p.y. | Salary growth Unified Plan p.y.    
Disclosure of defined benefit plans [line items]    
Real rate 2.00% 2.00%
Nominal rate 6.08% 6.59%
Expected rate of discount/return p.y. | Salary growth Plan III p.y.    
Disclosure of defined benefit plans [line items]    
Real rate 1.50% 1.50%
Nominal rate 5.56% 6.07%
Demographic | Mortality Table    
Disclosure of defined benefit plans [line items]    
Nominal assumption AT - 2000  AT - 2000
Demographic | Mortality table of individuals with permanent disability    
Disclosure of defined benefit plans [line items]    
Nominal assumption WINKLEVOSS  WINKLEVOSS
Demographic | Table of new disability benefit vested    
Disclosure of defined benefit plans [line items]    
Nominal assumption TASA 1927  TASA 1927