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Information by Segment - Summary of Segment Disclosure for Company's Consolidated Operations Narrative (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Disclosure of operating segments [line items]              
Total revenues $ 9,231 [1] $ 183,615 $ 194,471 [2] $ 182,342      
Total assets 13,225 [3]   257,839 [4]   $ 263,066   $ 263,787
Total liabilities $ 7,069 [3]   128,154 [4]   140,609   132,037
Mexico and Central America Segment              
Disclosure of operating segments [line items]              
Total assets     147,374   165,887   147,748
Total liabilities     95,694   113,727   96,525
South America Segment              
Disclosure of operating segments [line items]              
Total assets     110,465   97,179   116,039
Total liabilities     32,460   26,882   35,512
Mexico | Mexico and Central America Segment              
Disclosure of operating segments [line items]              
Total revenues   87,833 91,358 84,352      
Total assets     130,045   148,068   130,865
Total liabilities     91,427   109,086   92,340
Brazil | South America Segment              
Disclosure of operating segments [line items]              
Total revenues   56,191 61,554 56,523      
Total assets     82,667   70,376   86,007
Total liabilities     24,103   19,148   26,851
Colombia | South America Segment              
Disclosure of operating segments [line items]              
Total revenues   12,049 13,522 14,580      
Total assets     16,518   15,993   17,626
Total liabilities     4,154   3,262   4,061
Argentina | South America Segment              
Disclosure of operating segments [line items]              
Total revenues   5,468 6,725 $ 9,152      
Total assets     5,341   5,039   6,021
Total liabilities     1,637   1,842   $ 2,059
Uruguay | South America Segment              
Disclosure of operating segments [line items]              
Total revenues   $ 3,124 3,421        
Total assets     5,939   5,771 $ 6,385  
Total liabilities     $ 2,566   $ 2,630 $ 2,541  
[1] Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated – See note 3.18
[3] Convenience translation to U.S. dollars ($) – See Note 2.2.3
[4] 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