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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets $ 88,074,856 $ 86,613,327 $ 104,573,985 $ 98,589,818
Deferred tax expense in net profit for the year (3,894,384) 1,994,063 5,151,492  
Provisions [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 17,964,305 20,781,421    
Deferred tax expense in net profit for the year (257,070) 1,841,705 1,579,604  
Deferred revenues [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 5,820,260 6,866,120    
Deferred tax expense in net profit for the year (1,077,259) 3,632,051 (965,010)  
Tax losses carry forward [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 26,630,407 27,881,491    
Deferred tax expense in net profit for the year (9,873) (5,833,660) (323,506)  
Property, plant and equipment [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets (11,962,544) (11,756,590)    
Deferred tax expense in net profit for the year (461,594) 453,493 1,974,753  
Inventories [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 1,787,065 2,106,976    
Deferred tax expense in net profit for the year (291,531) 81,270 519,046  
Licenses and rights of use [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets (3,399,931) (3,896,788)    
Deferred tax expense in net profit for the year 432,403 961,402 348,201  
Employee benefits [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 41,743,744 33,673,874    
Deferred tax expense in net profit for the year (1,019,042) 1,128,209 1,225,310  
Other [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 9,491,550 10,956,823    
Deferred tax expense in net profit for the year $ (1,210,417) $ (270,407) $ 793,094