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Inventories, net - Additional Information (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of inventories [abstract]
Cost of inventories recognized in cost of sales	$ 167,546,288	$ 174,543,602	$ 180,013,986

X

- 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

X

- 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 2020-01-01
-Paragraph 36
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2020-en-r&anchor=para_36_d&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_CostOfInventoriesRecognisedAsExpenseDuringPeriod
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration