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Accounts Payable, Accrued Liabilities and Asset Retirement Obligations - Summary of Movements in Asset Retirement Obligations (Detail) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of asset retirement obligations [abstract] |  |
Beginning balance | $ 15,816,744 | $ 15,971,601
Business combination |  | 293,548
Effect of translation | 374,418 | (1,339,033)
Increase of the year | 2,412,908 | 1,600,197
Applications payments | (593,644) | (128,842)
Applications reversals | (122,435) | (580,727)
Ending balance | $ 17,887,991 | $ 15,816,744

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- Definition Applications, payments of asset retirement obligations, non-current. + References No definition available. + Details
Name: | amx_ApplicationsPaymentsOfAssetRetirementObligationsNoncurrent
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Applications, reversals of asset retirement obligations, non-current. + References No definition available. + Details
Name: | amx_ApplicationsReversalsOfAssetRetirementObligationsNoncurrent
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disclosure of asset retirement obligations. + References No definition available. + Details
Name: | amx_DisclosureOfAssetRetirementObligationsAbstract
Namespace Prefix: | amx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Effect of exchange rate changes on asset retirement obligations, non-current. + References No definition available. + Details
Name: | amx_EffectOfExchangeRateChangesOnAssetRetirementObligationsNoncurrent
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Increase (decrease) in asset retirement obligations during period, non-current. + References No definition available. + Details
Name: | amx_IncreaseDecreaseInAssetRetirementObligationsDuringPeriodNoncurrent
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Movements in asset retirement obligation related to business combinations current. + References No definition available. + Details
Name: | amx_MovementsInAssetRetirementObligationRelatedToBusinessCombinationsCurrent
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Noncurrent asset retirement obligations. + References No definition available. + Details
Name: | amx_NoncurrentAssetRetirementObligations
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant