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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets $ 77,822,839 $ 66,303,077 $ 88,074,856 $ 86,613,327
Deferred tax expense in net profit for the year 19,623,461 12,218,368 (3,788,397)  
Deferred tax discontinued operations 143,482 73,646 (105,986)  
Provisions [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 18,038,607 19,312,081    
Deferred tax expense in net profit for the year 2,324,227 3,887,471 318,843  
Deferred revenues [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 9,041,137 6,748,101    
Deferred tax expense in net profit for the year 2,202,413 897,762 (1,077,259)  
Tax losses carry forward [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 33,954,926 25,121,933    
Deferred tax expense in net profit for the year 10,352,978 2,236,244 (9,873)  
Property, plant and equipment [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets (33,445,815) (39,459,549)    
Deferred tax expense in net profit for the year 9,246,429 3,990,750 (1,067,307)  
Inventories [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 135,658 (537,404)    
Deferred tax expense in net profit for the year 814,626 (2,394,485) (55,380)  
Licenses and rights of use [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets (3,668,389) (5,177,924)    
Deferred tax expense in net profit for the year (151,013) 344,729 432,403  
Employee benefits [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 40,246,031 45,467,827    
Deferred tax expense in net profit for the year (354,803) 422,473 (1,019,042)  
Other [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Net deferred tax assets 13,520,684 14,828,012    
Deferred tax expense in net profit for the year $ (4,811,396) $ 2,833,424 $ (1,310,782)