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Related Parties - Summary of Transactions with Related Parties (Detail) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of transactions between related parties [abstract] |  |  |
Construction services, purchases of materials, inventories and property, plant and equipment | $ 7,130,769 | $ 8,573,894 | $ 7,211,960
Insurance premiums, fees paid for administrative and operating services, brokerage services and others | 4,375,113 | 4,590,620 | 4,134,380
Rent of towers |  |  | 6,168,592
Other services | 1,101,528 | 1,277,404 | 1,864,017
Investments and expenses | 12,607,410 | 14,441,918 | 19,378,949
Service revenues | 608,248 | 538,110 | 679,220
Sales of equipment | 656,801 | 944,697 | 1,296,204
Revenues | $ 1,265,049 | $ 1,482,807 | $ 1,975,424

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- Definition Construction services purchases of materials inventories and property plant and equipment related party transactions. + References No definition available. + Details
Name: | amx_ConstructionServicesPurchasesOfMaterialsInventoriesAndPropertyPlantAndEquipmentRelatedPartyTransactions
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Insurance premiums fees paid for administrative and operating services brokerage services and others related party transactions. + References No definition available. + Details
Name: | amx_InsurancePremiumsFeesPaidForAdministrativeAndOperatingServicesBrokerageServicesAndOthersRelatedPartyTransactions
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Investments and expenses of related party transactions. + References No definition available. + Details
Name: | amx_InvestmentsAndExpensesOfRelatedPartyTransactions
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Other services related party transactions. + References No definition available. + Details
Name: | amx_OtherServicesRelatedPartyTransactions
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Rent of towers related party transactions. + References No definition available. + Details
Name: | amx_RentOfTowersRelatedPartyTransactions
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Revenue from services, related party transactions. + References No definition available. + Details
Name: | amx_RevenueFromServicesRelatedPartyTransactions
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Sale of equipment of related party transactions. + References No definition available. + Details
Name: | amx_SaleOfEquipmentOfRelatedPartyTransactions
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of revenue arising from the rendering of services in related party transactions. [Refer: Revenue; Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 21 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_21_c&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_RevenueFromRenderingOfServicesRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration