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Income Taxes - Temporary differences and tax loss carryforwards to arrive deferred income taxes (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes      
Deferred income tax assets, net $ 12,317,531 $ 12,380,445 $ 7,665,038
Benefit from tax loss carryforwards derived from the disposal of the Group's investment in GSF 3,149,130 2,914,499  
Accrued liabilities      
Income Taxes      
Deferred tax assets 3,388,289 3,208,863  
Deferred income tax assets, net 3,388,289 3,208,863 2,656,354
Allowance for doubtful accounts      
Income Taxes      
Deferred tax assets 1,115,990 1,160,708  
Deferred income tax assets, net 1,115,990 1,160,708 1,187,427
Customer advances      
Income Taxes      
Deferred tax assets 2,230,958 2,761,196  
Deferred income tax assets, net 2,230,958 2,761,196 2,598,037
Property, plant and equipment, net      
Income Taxes      
Deferred tax assets 1,159,085    
Deferred income tax assets, net 1,159,085 (305,654) (954,678)
Operating tax losses      
Income Taxes      
Deferred tax assets 10,596,342 11,448,996  
Capital tax losses      
Income Taxes      
Deferred tax assets 1,812,648 2,380,620  
Investments      
Income Taxes      
Deferred tax liabilities (3,968,176) (4,471,232)  
Deferred income tax assets, net (3,968,176) (4,471,232) (3,504,137)
Property, plant and equipment, net      
Income Taxes      
Deferred tax liabilities   (305,654)  
Deferred income tax assets, net   (305,654)  
Derivative financial instruments      
Income Taxes      
Deferred tax liabilities (355,051)    
Deferred income tax assets, net (355,051)   (1,801)
Intangible assets and transmission rights      
Income Taxes      
Deferred tax liabilities (2,646,267) (2,898,572)  
Deferred income tax assets, net (2,646,267) (2,898,572) (3,922,230)
Prepaid expenses and other items      
Income Taxes      
Deferred tax liabilities (1,274,056) (1,184,163)  
Deferred income taxes of Mexican companies      
Income Taxes      
Deferred income tax assets, net 12,059,762 12,100,762  
Deferred income tax assets of foreign subsidiaries      
Income Taxes      
Deferred income tax assets, net $ 257,769 $ 279,683 $ 195,348