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Employee Benefits - Summary of Long-Term Direct Employee Benefits (Detail) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of long term direct employee benefits [abstract] |  |
Beginning balance | $ 10,158,036 | $ 11,251,499
Effect of translation | (493,795) | 795,581
Increase of the year | 1,750,831 | 771,274
Applications, Payments | (2,079,880) | (2,077,632)
Applications Applications, Reversals | (1,223,414) | (582,686)
Ending balance | $ 8,111,778 | $ 10,158,036

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- Definition Disclosure of long term direct employee benefits. + References No definition available. + Details
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Namespace Prefix: | amx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Long term direct employee benefits + References No definition available. + Details
Name: | amx_LongTermDirectEmployeeBenefits
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Long term direct employee benefits decrease effect due to payments. + References No definition available. + Details
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Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Long term direct employee benefits decrease effect due to reversals. + References No definition available. + Details
Name: | amx_LongTermDirectEmployeeBenefitsDecreaseEffectDueToReversals
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Long term direct employee benefits effect of translation adjustments. + References No definition available. + Details
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Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Long term direct employee benefits Increase effect. + References No definition available. + Details
Name: | amx_LongTermDirectEmployeeBenefitsIncreaseEffect
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration