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Accounts Payable, Accrued Liabilities and Asset Retirement Obligations - Summary of Movements in Contingent Liabilities (Detail) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of contingent liabilities [abstract] |  |
Beginning balance | $ 51,079,131 | $ 50,766,070
Business combination | 7,812 | 115,971
Effect of translation | (5,729,826) | (648,685)
Increase of the year | 15,683,252 | 10,510,473
Applications payments | (6,203,329) | (7,618,520)
Applications reversals | (14,555,467) | (2,046,178)
Ending balance | $ 40,281,573 | $ 51,079,131

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- Definition Applications, payments contingent liabilities, current. + References No definition available. + Details
Name: | amx_ApplicationsPaymentsContingentLiabilitiesCurrent
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Applications, reversals contingent liabilities, current. + References No definition available. + Details
Name: | amx_ApplicationsReversalsContingentLiabilitiesCurrent
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contingent consideration liabilities current. + References No definition available. + Details
Name: | amx_ContingentConsiderationLiabilitiesCurrent
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Effect of exchange rate changes on contingent liabilities, current. + References No definition available. + Details
Name: | amx_EffectOfExchangeRateChangesOnContingentLiabilitiesCurrent
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Increase (decrease) in contingent liabilities during period, current. + References No definition available. + Details
Name: | amx_IncreaseDecreaseInContingentLiabilitiesDuringPeriodCurrent
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Movements in contingent liabilities related to business combinations, current. + References No definition available. + Details
Name: | amx_MovementsInContingentLiabilitiesRelatedToBusinessCombinationsCurrent
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_DisclosureOfContingentLiabilitiesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration