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Income Taxes - 2014 and 2010 Tax Reform (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2013
Dec. 31, 2017
Dec. 31, 2016
Income Taxes      
Less: Current portion   $ 2,524,349 $ 2,012,536
Non-current portion   4,730,620 6,386,877
2014 Tax Reform      
Income Taxes      
Aggregate additional income tax liability for the elimination of the tax consolidation regime $ 6,813,595    
Benefit from tax loss carryforwards of Mexican companies in the Group $ 7,936,044    
Tax losses of subsidiaries, net   6,582,543 7,575,347
Income tax payable   6,582,543  
Less: Current portion   1,851,923 1,188,470
Non-current portion   $ 4,730,620 $ 6,386,877