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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
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of contingent liabilities [abstract] |  |
Beginning balance | $ 40,281,573 | $ 51,079,131
Business combination | 1,378,611 | 7,812
Effect of translation | (2,302,058) | (5,729,826)
Increase of the year | 6,410,975 | 15,683,252
Applications payments | (5,483,327) | (6,203,329)
Applications reversals | (1,833,518) | (14,555,467)
Reclassification by adoption of IFRIC 23 | (4,072,287) |
Ending balance | $ 34,379,969 | $ 40,281,573

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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 Increase decrease through reclassification by adoption of new standard, asset retirement obligations. + References No definition available. + Details
Name: | amx_IncreaseDecreaseThroughReclassificationByAdoptionOfNewStandardAssetRetirementObligations
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