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Accounts Receivable from Subscribers, Distributors, Recoverable Taxes and Other, Net - Additional Information (Detail) - MXN ($)	Dec. 31, 2017	Dec. 31, 2016
Greater than 90 days [member]
Disclosure of accounts receivable [line items]
Impairment loss on accounts receivables	$ 0	$ 0

X

- Definition

Disclosure Of Accounts Receivable [line items]

+ References

No definition available.

+ Details

Name:	amx_DisclosureOfAccountsReceivableLineItems
Namespace Prefix:	amx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Impairment loss on accounts receivables.

+ References

No definition available.

+ Details

Name:	amx_ImpairmentLossOnAccountsReceivable
Namespace Prefix:	amx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	ifrs-full_MaturityAxis=amx_LaterThanNinetyDaysMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: