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Related Parties - Summary of Transactions with Related Parties (Detail) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of transactions between related parties [abstract] |  |  |
Construction services, purchases of materials, inventories and property, plant and equipment | $ 7,211,960 | $ 11,030,944 | $ 9,917,280
Rent of towers | 6,168,592 | 5,326,366 | 4,748,503
Insurance premiums, fees paid for administrative and operating services, brokerage services and others | 4,134,380 | 4,135,578 | 4,118,469
Other services | 1,864,017 | 2,802,667 | 1,899,818
Investments and expenses | 19,378,949 | 23,295,555 | 20,684,070
Revenues services | 679,220 | 416,047 | 411,076
Sales of equipment | 1,296,204 | 2,313,840 | 2,679,591
Revenues | $ 1,975,424 | $ 2,729,887 | $ 3,090,667

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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 2018-01-01 -Paragraph 21 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2018-03-01&anchor=para_21_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_RevenueFromRenderingOfServicesRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration