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Description of the Business and Relevant Events - Additional Information (Detail) $ in Thousands, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Dec. 31, 2020 MXN ($) Country
Disclosure Of Corporate Information [line items] |  |
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 25 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 |  | 25
Number of countries in which company holds license | Country |  | 24
Percentage of voting equity interests acquired |  | 80.00%
Verizon Communications Inc [Member] | Twenty Twenty Business Acquisition [Member] |  |
Disclosure Of Corporate Information [line items] |  |
Consideration transferred, acquisition-date fair value | $ 6,250 |
Percentage of voting equity interests acquired | 100.00% |
Number Of Subscribers | $ 21 |
Consideration payable | 500 |
Deferred Commercial Consideration Payable | $ 150 |
Currency risk [member] |  |
Disclosure Of Corporate Information [line items] |  |
Percentage of fell in value of Mexican Peso Over foreign currency |  | 5.00%
Currency risk [member] | Covid 19 [Member] |  |
Disclosure Of Corporate Information [line items] |  |
Foreign currency exchange loss |  | $ 65,366,200
Currency risk [member] | U.S. dollars [member] | Covid 19 [Member] |  |
Disclosure Of Corporate Information [line items] |  |
Percentage of fell in value of Mexican Peso Over foreign currency |  | 5.80%
Currency risk [member] | Euros [member] | Covid 19 [Member] |  |
Disclosure Of Corporate Information [line items] |  |
Percentage of fell in value of Mexican Peso Over foreign currency |  | 15.30%
Currency risk [member] | Great Britain Pound (GBP) [member] | Covid 19 [Member] |  |
Disclosure Of Corporate Information [line items] |  |
Percentage of fell in value of Mexican Peso Over foreign currency |  | 9.20%

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