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Other Assets, Net - Summary of Analysis of Other Assets (Parenthetical) (Detail) - MXN ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of other assets [abstract]
Judicial deposits	$ 20,288,382	$ 20,030,041

X

- 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

X

- 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
-Note Expiry date 2018-01-01
-Name IAS
-Number 39
-IssueDate 2017-01-01
-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
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 9
-IssueDate 2017-01-01
-Paragraph 3.2.23
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=9&date=2017-03-01&anchor=para_3.2.23_a&doctype=Standard
-URIDate 2017-03-09

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant