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Inventories, net - Additional Information (Details) (Detail) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of inventories [abstract] |  |  |
Cost of inventories recognized in cost of sales | $ 180,013,986 | $ 170,154,336 | $ 172,495,376

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

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- Definition The amount of inventories recognised as an expense during the period. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2018-01-01 -Paragraph 36 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2018-03-01&anchor=para_36_d&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_CostOfInventoriesRecognisedAsExpenseDuringPeriod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration