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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, 2018 | Dec. 31, 2017
Disclosure of asset retirement obligations [abstract] |  |
Beginning balance | $ 18,245,129 | $ 16,288,631
Effect of translation | (2,020,853) | (119,928)
Increase of the year | 1,062,745 | 3,160,320
Applications payments | (151,364) | (126,088)
Applications reversals | (1,164,056) | (957,806)
Ending balance | $ 15,971,601 | $ 18,245,129

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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

X
- 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 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