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Taxes - Reconciliation of tax rate (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Major components of tax expense (income) [abstract]      
Mexican statutory income tax rate 30.00% 30.00% 30.00%
Difference between book and tax inflationary values and translation effects (5.10%) (2.20%) (4.00%)
Annual inflation tax adjustment 3.00% 0.20% (1.20%)
Difference between statutory income tax rates 1.00% 0.90% 1.80%
Non-deductible expenses 3.80% 4.50% 3.20%
Taxable (non-taxable) income 2.90% (1.00%) (0.50%)
Effect of changes in Argentina tax law 0.10% (0.30%) (0.90%)
Others (1.90%) (0.70%) 0.90%
Impairments 4.60% 0.90% 0.40%
Adjustments for previous tax years 30.30%    
Income tax credit (8.30%)    
Tax Loss 16.30% 0.10% 0.50%
Consolidated Effective income tax rate (4) 76.70% 32.40% 30.20%
Effective income tax rate without extraordinary effects 33.80%