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Income Taxes (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes        
Income taxes, current   $ 5,382,865 $ 6,724,071 $ 7,380,430
Income taxes, deferred   (1,108,745) (3,851,836) (1,048,212)
Income tax provision   $ 4,274,120 $ 2,872,235 $ 6,332,218
Current income tax of Mexican companies to the total current income taxes (as a percent)   93.00% 93.00% 94.00%
Corporate income tax rate (as a percent)   30.00% 30.00% 30.00%
Changes in tax rates or tax laws enacted or announced        
Income Taxes        
Corporate income tax rate (as a percent) 30.00%