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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, 2019 | Dec. 31, 2018
Disclosure of asset retirement obligations [abstract] |  |
Beginning balance | $ 15,971,601 | $ 18,245,129
Business combination | 293,548 |
Effect of translation | (1,339,033) | (2,020,853)
Increase of the year | 1,600,197 | 1,062,745
Applications payments | (128,842) | (151,364)
Applications reversals | (580,727) | (1,164,056)
Ending balance | $ 15,816,744 | $ 15,971,601

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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

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- 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