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23 Post-employment benefits (Details 13)
 12 Months Ended
Dec. 31, 2019
Unified Plan [Member] | Fixed Income [Member]  
Disclosure of defined benefit plans [line items]  
Target limit 86.50% [1]
Minimum limit 55.00%
Unified Plan [Member] | Variable Income [Member]  
Disclosure of defined benefit plans [line items]  
Target limit 5.00% [1]
Minimum limit 1.00%
Unified Plan [Member] | Loans [Member]  
Disclosure of defined benefit plans [line items]  
Target limit 0.50% [1]
Minimum limit 0.00%
Unified Plan [Member] | Real Estate [Member]  
Disclosure of defined benefit plans [line items]  
Target limit 5.00% [1]
Minimum limit 1.00%
Unified Plan [Member] | Investment Structuring [Member]  
Disclosure of defined benefit plans [line items]  
Target limit 3.00% [1]
Minimum limit 0.00%
Unified Plan [Member] | Investments Abroad [Member]  
Disclosure of defined benefit plans [line items]  
Target limit 0.00% [1]
Minimum limit 0.00%
Plan III [Member] | Fixed Income [Member]  
Disclosure of defined benefit plans [line items]  
Target limit 51.00%
Minimum limit 23.00%
Plan III [Member] | Variable Income [Member]  
Disclosure of defined benefit plans [line items]  
Target limit 14.00%
Minimum limit 8.00%
Plan III [Member] | Loans [Member]  
Disclosure of defined benefit plans [line items]  
Target limit 3.00%
Minimum limit 1.00%
Plan III [Member] | Real Estate [Member]  
Disclosure of defined benefit plans [line items]  
Target limit 10.00%
Minimum limit 0.00%
Plan III [Member] | Investment Structuring [Member]  
Disclosure of defined benefit plans [line items]  
Target limit 16.00%
Minimum limit 0.00%
Plan III [Member] | Investments Abroad [Member]  
Disclosure of defined benefit plans [line items]  
Target limit 6.00%
Minimum limit 0.00%
[1] Target based on the total investment of each plan.