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Description of the Business and Relevant Events - Additional Information (Detail)
$ / shares in Units, Subscribers in Millions, Customers in Millions, $ in Millions
1 Months Ended 12 Months Ended
Nov. 23, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Customers
Towers
Subscribers
Dec. 31, 2021
Country
Sep. 14, 2020
Percentage of shareholding approval of spin off        
Corporate information description     América Móvil, S.A.B. de C.V. and subsidiaries (hereinafter, the “Company”, “América Móvil” or “AMX”) was incorporated under laws of Mexico on September 25, 2000. The Company provides telecommunications services in 24 countries throughout Latin America, the United States, the Caribbean and Europe. These telecommunications services include mobile and fixed-line voice services, wireless and fixed data services, internet access and Pay TV, over the top and other related services. The Company also sells equipment, accessories and computers.  
Number of countries in which company operates | Country     24  
Number of countries in which company holds license | Country     24  
Spin Off [Member]        
Percentage of shareholding approval of spin off        
Percentage of shareholding approval of spin off   98.00%    
Number of telecommunications towers transferred under spin off | Towers   36,000    
Agreement to Commence Joint Venture [Member] | VTR [Member]        
Percentage of shareholding approval of spin off        
Number of subcribers | Subscribers   3    
Agreement to Commence Joint Venture [Member] | Claro Chile [Member]        
Percentage of shareholding approval of spin off        
Number of subcribers | Customers   6.5    
Agreement to Commence Joint Venture [Member] | VTR and Claro Chile [Member] | Liberty Latin America [Member]        
Percentage of shareholding approval of spin off        
Proportion of ownership interest in joint venture   50.00%    
Agreement to Commence Joint Venture [Member] | VTR and Claro Chile [Member] | Amrica Movil [Member]        
Percentage of shareholding approval of spin off        
Proportion of ownership interest in joint venture   50.00%    
Claro Panama S A [member] | Agreement to Sale Subsidiary [Member]        
Percentage of shareholding approval of spin off        
Percentage of ownership interest in subsidiary agreed to sell   100.00%    
Aggregate consideration receivable on sale of subsidiary   $ 200.0    
Verizon Communications Inc [Member] | Tracfone Wireless Inc Tracfone [member]        
Percentage of shareholding approval of spin off        
Percentage of ownership interest in subsidiary agreed to sell       100.00%
Verizon Communications Inc [Member] | Tracfone Wireless Inc Tracfone [member] | Discontinued operations [member]        
Percentage of shareholding approval of spin off        
Proceeds from sale of Subsidiary $ 3,625.7      
Shares received on sale of subsidiary from Counterparty | shares 57,596,544      
Share price | $ / shares $ 51.54      
Earntout contingent consideration receivable $ 650.0