XML 191 R118.htm IDEA: XBRL DOCUMENT
v3.21.1

Employee Benefits - Summary of Long-Term Direct Employee Benefits (Detail) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of long term direct employee benefits [abstract] |  |
Beginning balance | $ 8,175,767 | $ 8,111,778
Effect of translation | 1,256,880 | (518,180)
Increase of the year | 1,729,392 | 2,528,224
Applications, Payments | (2,411,436) | (1,946,055)
Ending balance | $ 8,750,603 | $ 8,175,767

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

X
- 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

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

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

X
- 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