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Other Assets, Net - Summary of Analysis of Other Assets (Parenthetical) (Detail) - MXN ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of other assets [abstract] |  |
Judicial deposits | $ 18,172,342 | $ 20,288,382

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- Definition Disclosure of other assets [abstract]. + 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 The amount of non-current non-cash collateral assets (such as debt or equity instruments) provided to a transferee, for which the transferee has the right by contract or custom to sell or repledge the collateral. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 9 -IssueDate 2018-01-01 -Paragraph 3.2.23 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=9&date=2018-03-01&anchor=para_3.2.23_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IAS -Number 39 -IssueDate 2018-01-01 -Paragraph 37 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=39&date=2017-03-02&anchor=para_37_a&doctype=Standard&book=b_pdf -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | debit
Period Type: | instant