Capital securities redemption Period.

No definition available.

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

- Definition

Convertible bonds

+ References

No definition available.

+ Details

Name:	amx_ConvertibleBonds
Namespace Prefix:	amx_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of undrawn revoloving syndicated facilities.

+ References

No definition available.

+ Details

Name:	amx_NumberOfUndrawnRevolovingSyndicatedFacilities
Namespace Prefix:	amx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of leverage for equity credit.

+ References

No definition available.

+ Details

Name:	amx_PercentageOfLeverageForEquityCredit
Namespace Prefix:	amx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of Shares outstanding.

+ References

No definition available.

+ Details

Name:	amx_PercentageOfSharesOutstanding
Namespace Prefix:	amx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Shares selling price per share.

+ References

No definition available.

+ Details

Name:	amx_SharesSellingPricePerShare
Namespace Prefix:	amx_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Tax withholding percentage.

+ References

No definition available.

+ Details

Name:	amx_TaxWithholdingPercentage
Namespace Prefix:	amx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_BorrowingsInterestRate
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The maturity of borrowings. [Refer: Borrowings]

+ References

+ Details

Name:	ifrs-full_BorrowingsMaturity
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The currency in which the borrowings are denominated. [Refer: Borrowings]

+ References

+ Details

Name:	ifrs-full_BorrowingsOriginalCurrency
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average of interest and other costs that an entity incurs in connection with the borrowing of funds applicable to the borrowings of the entity that are outstanding during the period, other than borrowings made specifically for the purpose of obtaining a qualifying asset. [Refer: Weighted average [member]; Borrowings]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 23
-IssueDate 2019-01-01
-Paragraph 26
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=23&code=ifrs-tx-2019-en-r&anchor=para_26_b&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_CapitalisationRateOfBorrowingCostsEligibleForCapitalisation
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of commercial paper issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_CommercialPapersIssued
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of loans received.

+ References

+ Details

Name:	ifrs-full_LoansReceived
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The number of shares issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_NumberOfSharesIssued
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=amx_InvestmentsAccountedForUsingEquityMethodInKoninklijkeKPNMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfInterestRatesAxis=amx_HybridNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=amx_SyndicatedCreditFacilityOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=amx_SyndicatedCreditFacilityTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=amx_SyndicatedRevolvingCreditFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=amx_TelekomAustriaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_EUR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=amx_SeriesOneHybridNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=amx_SeriesTwoHybridNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=amx_HybridNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=amx_LineOfCredit1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_GeographicalAreasAxis=country_MX
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Additional Information (Detail) € / shares in Units, € in Millions, £ in Millions, $ in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2018 EUR (€) shares	Dec. 31, 2019 MXN ($) CreditFacility € / shares shares	Dec. 31, 2018 MXN ($)	Dec. 31, 2019 USD ($) shares	Dec. 31, 2019 EUR (€) shares	Dec. 31, 2019 GBP (£) shares
Disclosure of detailed information about borrowings [line items]
Weighted average cost of borrowed funds		4.16%	4.31%
Commercial paper \| $		$ 2,599.1
Number of revolving syndicated credit facilities \| CreditFacility		2
Number of shares delivered \| shares		71,063,212,170		71,063,212,170	71,063,212,170	71,063,212,170
Investments accounted for using equity method Koninklijke KPN [member]
Disclosure of detailed information about borrowings [line items]
Number of shares delivered \| shares	224,695,844
Percentage of shares outstanding	5.00%
Nominal outstanding amount of bond \| €	€ 750
Sale of share price per share \| € / shares		$ 3.3374
Hybrid Notes [member]
Disclosure of detailed information about borrowings [line items]
Loan amount \| €	€ 900
Borrowings, maturity	2073	2073
Revolving Syndicated Credit Facility One [member]
Disclosure of detailed information about borrowings [line items]
Loan amount \| $				$ 2,000
Borrowings, maturity		2021
Revolving Syndicated Credit Facility Two [member]
Disclosure of detailed information about borrowings [line items]
Loan amount \| $				$ 2,500
Borrowings, maturity		2024
Syndicated revolving credit facilities [member] \| Telekom Austria [member] \| Euros [member]
Disclosure of detailed information about borrowings [line items]
Loan amount \| €					€ 1,000
Series One Hybrid Notes [member]
Disclosure of detailed information about borrowings [line items]
Loan amount \| €					€ 550
Borrowings interest rate		6.375%		6.375%	6.375%	6.375%
Capital securities beginning redemption period		2023
Borrowings, original currency		Euros
Series Two Hybrid Notes [member]
Disclosure of detailed information about borrowings [line items]
Loan amount \| £						£ 550
Borrowings interest rate		6.375%		6.375%	6.375%	6.375%
Capital securities beginning redemption period		2020
Borrowings, original currency		Sterling pounds
Hybrid Notes [member]
Disclosure of detailed information about borrowings [line items]
Percentage of leverage for equity credit		50.00%
Lines of credit [member]
Disclosure of detailed information about borrowings [line items]
Commercial paper \| $		$ 53,645.0	$ 29,651.0
Lines of credit [member] \| Euros [member]
Disclosure of detailed information about borrowings [line items]
Borrowings, maturity		2020	2019
Borrowings interest rate		0.03%		0.03%	0.03%	0.03%
Mexico [member]
Disclosure of detailed information about borrowings [line items]
Commissions or the reimbursements for Mexican tax withholdings		4.90%	4.90%