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Operating segments (Details)
$ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2020
MXN ($)
segment
Dec. 31, 2019
MXN ($)
segment
Dec. 31, 2018
MXN ($)
segment
Operating segments        
Number of geographic segments | segment 2 2 2 2
Total operating revenues $ 1,110,828 $ 22,159,591 $ 34,752,672 $ 27,305,150
Non-derivatives financial instruments $ (20,614) (411,222) (72,949)  
Domestic (Mexico)        
Operating segments        
Total operating revenues   16,572,198 24,594,797 18,493,476
United States of America and Central America        
Operating segments        
Total operating revenues   $ 5,998,615 $ 10,230,824 $ 8,811,674
United States of America        
Operating segments        
Percentage of total revenues from external customers 27.00% 27.00% 29.00% 31.00%