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Mergers and Acquisitions - Summary of Fair Value of Net Assets Acquired (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
MXN ($)
Dec. 31, 2020
USD ($)
 [2]
Dec. 31, 2020
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Disclosure of Detailed Information About Business Combination [Line Items]          
Total assets $ 257,839 [1] $ 13,225 $ 263,066   $ 263,787
Total liabilities (128,154) [1] $ (7,069) (140,609)   (132,037)
Goodwill 107,088   $ 100,082    
Aggregated Individually Immaterial Business Combinations          
Disclosure of Detailed Information About Business Combination [Line Items]          
Total current assets, including cash acquired         1,864
Total other non current assets         4,031
Distribution rights         1,715
Total assets         7,610
Total liabilities         (3,961)
Net assets acquired         3,649
Goodwill         2,903
Total consideration transferred         6,552
Cash acquired       $ (860) (860)
Net cash paid         $ 5,692
Aggregated Individually Immaterial Business Combinations | Non-current Assets          
Disclosure of Detailed Information About Business Combination [Line Items]          
Business acquisition, fair value adjustments 236        
Aggregated Individually Immaterial Business Combinations | Distribution Rights          
Disclosure of Detailed Information About Business Combination [Line Items]          
Business acquisition, fair value adjustments 2,887        
Aggregated Individually Immaterial Business Combinations | Goodwill          
Disclosure of Detailed Information About Business Combination [Line Items]          
Business acquisition, fair value adjustments $ 2,903        
[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