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Income Taxes - Summary of Analysis of Temporary Differences Giving Rise to Net Deferred Tax Liability (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets $ 86,613,327 $ 104,573,985 $ 98,589,818 $ 69,817,147
Deferred tax expense in net profit for the year 1,994,063 5,151,492 18,285,052  
Provisions [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 20,781,421 26,268,666    
Deferred tax expense in net profit for the year 1,841,705 1,579,604 1,622,132  
Deferred revenues [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 6,866,120 7,461,802    
Deferred tax expense in net profit for the year 3,632,051 (965,010) (12,128)  
Tax losses carry forward [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 27,881,491 38,332,408    
Deferred tax expense in net profit for the year (5,833,660) (323,506) 12,706,245  
Property, plant and equipment [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets (11,756,590) (9,929,129)    
Deferred tax expense in net profit for the year 453,493 1,974,753 2,445,783  
Inventories [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 2,106,976 2,003,049    
Deferred tax expense in net profit for the year 81,270 519,046 (229,571)  
Licenses and rights of use [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets (3,896,788) (2,455,877)    
Deferred tax expense in net profit for the year 961,402 348,201 54,182  
Employee benefits [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 33,673,874 33,253,071    
Deferred tax expense in net profit for the year 1,128,209 1,225,310 3,616,952  
Other [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 10,956,823 9,639,995    
Deferred tax expense in net profit for the year $ (270,407) $ 793,094 $ (1,918,543)