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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets $ 104,573,985 $ 98,589,818 $ 69,817,147 $ 52,310,097
Deferred tax expense in net profit for the year 5,151,492 18,285,052 15,752,347  
Provisions [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 26,268,666 25,850,131    
Deferred tax expense in net profit for the year 1,579,604 1,622,132 (126,330)  
Deferred revenues [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 7,461,802 8,222,412    
Deferred tax expense in net profit for the year (965,010) (12,128) 1,065,242  
Tax losses carry forward [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 38,332,408 38,208,079    
Deferred tax expense in net profit for the year (323,506) 12,706,245 (1,222,172)  
Property, plant and equipment [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets (9,929,129) (9,716,615)    
Deferred tax expense in net profit for the year 1,974,753 2,445,783 7,110,085  
Inventories [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 2,003,049 1,522,739    
Deferred tax expense in net profit for the year 519,046 (229,571) (1,527,453)  
Licenses and rights of use [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets (2,455,877) (2,530,747)    
Deferred tax expense in net profit for the year 348,201 54,182 2,548,353  
Employee benefits [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 33,253,071 28,243,207    
Deferred tax expense in net profit for the year 1,225,310 3,616,952 2,614,932  
Other [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 9,639,995 8,790,612    
Deferred tax expense in net profit for the year $ 793,094 $ (1,918,543) $ 5,289,690