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Income Taxes - Summary of Temporary Differences Giving Rise to Deferred Income Tax Liabilities (Assets) (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2020
USD ($)
 [2]
Dec. 31, 2020
MXN ($)
Dec. 31, 2017
MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred tax, asset   $ (10,432) [1]   $ (560) $ (11,143)  
Deferred tax liabilities   3,771 [1]   $ 124 2,474  
Deferred income tax related to consolidated statement of financial position   (6,661) $ (5,582)   (8,669) $ (6,298)
Deferred income tax related to consolidated statement of income $ (1,939) (363) 497      
Allowance for doubtful accounts            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   (60)     (64)  
Deferred income tax related to consolidated statement of income (10) (18) 76      
Inventories            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   (61)     23  
Deferred income tax related to consolidated statement of income 72 (37) (33)      
Prepaid expenses            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   43     26  
Deferred income tax related to consolidated statement of income (17) 41 (19)      
Property, plant and equipment, net            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   (863)     (1,006)  
Deferred income tax related to consolidated statement of income (90) 128 (392)      
Rights of use assets            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   197     176  
Deferred income tax related to consolidated statement of income (22) 197 0      
Other assets            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   20     (325)  
Deferred income tax related to consolidated statement of income (389) 24 74      
Finite useful lived intangible assets            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   148     (128)  
Deferred income tax related to consolidated statement of income (275) (78) 182      
Indefinite lived intangible assets            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   1,039     796  
Deferred income tax related to consolidated statement of income 140 114 31      
Post-employment and other non-current employee benefits            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   (387)     (381)  
Deferred income tax related to consolidated statement of income 4 65 (114)      
Derivative financial instruments            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   (7)     74  
Deferred income tax related to consolidated statement of income 80 (12) (39)      
Contingencies            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   (2,169)     (1,627)  
Deferred income tax related to consolidated statement of income 182 (94) 1,146      
Employee profit sharing payable            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   (201)     (208)  
Deferred income tax related to consolidated statement of income (7) 17 0      
Tax loss carryforwards            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   (9,224)     (6,915)  
Deferred income tax related to consolidated statement of income 2,342 (1,268) (1,082)      
Tax credits to recover            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   (1,855)     (2,594)  
Deferred income tax related to consolidated statement of income (1,629) (122) (109)      
Cumulative other comprehensive income            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   (721)     (590)  
Deferred income tax related to consolidated statement of income 86 29 (54)      
Liabilities of amortization of goodwill of business acquisition            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   7,663     6,554  
Deferred income tax related to consolidated statement of income 0 860 1,125      
Financial leasing            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   (190)     (211)  
Deferred income tax related to consolidated statement of income (23) (190) 0      
Other liabilities            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred income tax related to consolidated statement of financial position   (33)     $ (2,269)  
Deferred income tax related to consolidated statement of income $ (2,383) $ (19) $ (295)      
[1] The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18
[2] Convenience translation to U.S. dollars ($) – See Note 2.2.3