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23 Post-employment benefits (Details 12)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]    
Asset allocation 100.00% 100.00%
Fixed Income [Member]    
Disclosure of defined benefit plans [line items]    
Asset allocation 70.40% 82.20%
Variable Income [Member]    
Disclosure of defined benefit plans [line items]    
Asset allocation 9.10% 7.80%
Loans [Member]    
Disclosure of defined benefit plans [line items]    
Asset allocation 1.60% 1.60%
Real Estate [Member]    
Disclosure of defined benefit plans [line items]    
Asset allocation 7.20% 1.40%
Investment Structuring [Member]    
Disclosure of defined benefit plans [line items]    
Asset allocation 8.90% 7.10%
Investments Abroad [Member]    
Disclosure of defined benefit plans [line items]    
Asset allocation 2.80% 0.00%