XML 140 R104.htm IDEA: XBRL DOCUMENT
v3.19.1

Debt - Additional Information (Detail) € / shares in Units, $ in Thousands, € in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 MXN ($) shares | Dec. 31, 2018 MXN ($) CreditFacility € / shares shares | Dec. 31, 2017 MXN ($) | Dec. 31, 2018 USD ($) shares | Dec. 31, 2018 EUR (€) shares | Sep. 30, 2018 EUR (€) shares
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Weighted average cost of borrowed funds |  | 4.31% | 4.30% |  |  |
Borrowings |  | $ 638,922,453 | $ 697,884,899 |  |  |
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 |
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 |  |  |  |  | 224,695,844
Percentage of shares outstanding | 5.00% |  |  |  |  |
Nominal outstanding amount of bond | € |  |  |  |  |  | € 750
Sale of share price per share | € / shares |  | $ 3.3374 |  |  |  |
Euros [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings |  | $ 236,548,891 | 263,998,076 |  |  |
Top of range [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Consolidated ratio of debt to EBITDA |  | 400.00% |  |  |  |
Bottom of range [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Consolidated ratio of EBITDA to interest paid |  | 250.00% |  |  |  |
Hybrid Notes [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings |  | $ 26,213,095 | $ 49,148,975 |  |  |
Loan amount | $ 900,000 |  |  |  |  |
Borrowings, maturity | 2073 | 2073 | 2073 |  |  |
Hybrid Notes [member] | Euros [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings |  | $ 12,407,214 | $ 34,443,203 |  |  |
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 |  | 2019 |  |  |  |
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 | € |  |  |  |  | € 1,450 |
Borrowings interest rate |  | 6.375% |  | 6.375% | 6.375% |
Capital securities beginning redemption period |  | 2018 |  |  |  |
Borrowings, original currency |  | Euros |  |  |  |
Series Two Hybrid Notes [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Loan amount | € |  |  |  |  | € 1,450 |
Borrowings interest rate |  | 6.375% |  | 6.375% | 6.375% |
Capital securities beginning redemption period |  | 2023 |  |  |  |
Borrowings, original currency |  | Euros |  |  |  |
Series Three Hybrid Notes [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Loan amount |  |  |  | $ 550 |  |
Borrowings interest rate |  | 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% | 50.00% |  |  |
Lines of credit [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings |  | $ 29,651,000 | $ 31,364,000 |  |  |
Lines of credit [member] | Euros [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings |  | $ 5,526,850 |  |  |  |
Borrowings, maturity |  | 2019 |  |  |  |
Lines of credit [member] | Top of range [member] | Euros [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings interest rate |  | 0.00% |  | 0.00% | 0.00% |
Lines of credit [member] | Bottom of range [member] | Euros [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings interest rate |  | (0.10%) |  | (0.10%) | (0.10%) |
Mexico [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Commissions or the reimbursements for Mexican tax withholdings |  | 4.90% | 4.90% |  |  |

X
- Definition Capital securities redemption Period. + References No definition available. + Details
Name: | amx_CapitalSecuritiesRedemptionPeriod
Namespace Prefix: | amx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Consolidated ratio of debt to Ebitda. + References No definition available. + Details
Name: | amx_ConsolidatedRatioOfDebtToEBITDA
Namespace Prefix: | amx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Consolidated Ratio Of EBITDA To Interest Paid. + References No definition available. + Details
Name: | amx_ConsolidatedRatioOfEBITDAToInterestPaid
Namespace Prefix: | amx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Convertible bonds + References No definition available. + Details
Name: | amx_ConvertibleBonds
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- 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

X
- 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

X
- 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

X
- 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

X
- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_Borrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_BorrowingsInterestRate
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maturity of borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_BorrowingsMaturity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The currency in which the borrowings are denominated. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_BorrowingsOriginalCurrency
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 2018-01-01 -Paragraph 26 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=23&date=2018-03-01&anchor=para_26_b&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_CapitalisationRateOfBorrowingCostsEligibleForCapitalisation
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Definition The amount of loans received. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_LoansReceived
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_NumberOfSharesIssued
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | srt_CurrencyAxis=currency_EUR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

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

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=amx_SeriesThreeHybridNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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