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v3.21.1

Related Parties - Summary of Transactions with Related Parties (Parenthetical) (Detail) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of transactions between related parties [line items] |  |  |
Materials purchased from subsidiaries | $ 5,312,845 | $ 6,809,244 | $ 5,622,791
Grupo Carso, SAB de CV [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Network maintenance service cost | 203,013 | 956,132 | 778,191
Associates [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Software service expense | 13,490 | 16,161 | 13,784
Seguros Inbursa SA and Fianzas Guardiana Inbursa, SA [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Insurance premium | $ 2,713,370 | $ 2,623,795 | $ 2,541,703

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- Definition Insurance premium. + References No definition available. + Details
Name: | amx_InsurancePremium
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Network construction services and construction materials + References No definition available. + Details
Name: | amx_NetworkConstructionServicesAndConstructionMaterials
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Network maintenance service cost. + References No definition available. + Details
Name: | amx_NetworkMaintenanceServiceCost
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Software service expense. + References No definition available. + Details
Name: | amx_SoftwareServiceExpense
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=amx_GrupoCarsoSABDeCVMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_AssociatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=amx_SegurosInbursaSAAndFianzasGuardianaInbursaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |