XML 91 R55.htm IDEA: XBRL DOCUMENT
v3.19.1

Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Additional Information (Detail) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2018 MXN ($) | Dec. 31, 2018 MXN ($) Segment | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Apr. 09, 2019 | Dec. 31, 2018 USD ($)
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Impairment on trade receivables | $ 2,400,783,000 |  |  |  |  |
Impairment losses that impacted the carrying amount of debt instruments at fair value through OCI | $ 0 |  |  |  |  |
Cumulative index |  | 184.255 |  |  |  |
Percentage of annual basis index |  | 48.00% |  |  |  |
Closing exchange rate |  | 0.5221 |  |  |  | 0.5221
Cumulative translation (loss) gain |  | $ (137,598,218,000) | $ (73,261,794,000) |  |  | $ (6,990)
Impairment losses on goodwill |  | 0 | 0 | $ 0 |  |
Borrowing costs capitalised |  | 2,020,288,000 | 2,875,034,000 | 2,861,307,000 |  |
Impairment losses |  | 0 | 0 | 0 |  |
Impairment losses on intangibles |  | $ 0 | 0 | 0 |  |
Description of estimation of impairment cash-generating unit |  | In the estimation of impairments, the Company uses the strategic plans established for the separate cash-generating units to which the assets are assigned. Such strategic plans generally cover a period from 3 to 5 years. For longer periods, beginning in the fifth year, projections are based on such strategic plans while applying a constant or declining expected perpetual growth rate. |  |  |  |
Percentage of sensitivity analysis for increase in capital expenditures |  | 5.00% |  |  |  |
Adjustments of sensitivity analysis long-life assets |  | $ 1,558,823,000 |  |  |  |
Increase in weighted average cost of capital basis |  | 0.50% |  |  |  |
Adjustments for assumption of weighted average cost of capital |  | $ 1,135,854,000 |  |  |  |
Monthly contributions to pension fund |  | 17.50% |  |  |  |
Percentage of employee profit sharing based on individual company taxable income |  | 10.00% |  |  |  |
Advertising expenses |  | $ 26,255,952,000 | 28,718,563,000 | $ 28,180,538,000 |  |
Increase (decrease) in interest expense |  | $ 638,922,453,000 | $ 697,884,899,000 |  |  |
Concentration risk percentage |  | 10.00% |  |  |  | 10.00%
Number of segments | Segment |  | 0 |  |  |  |
Foreign subsidiaries [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Consolidated operating revenues |  | 73.00% | 74.00% | 72.00% |  |
Percentage of operating revenue as percentage of total assets |  | 80.00% | 81.00% |  |  |
Cost of sales [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Employee benefits expense |  | $ 47,671,143,000 | $ 48,696,331,000 | $ 46,759,415,000 |  |
Commercial, administrative and general expenses [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Employee benefits expense |  | $ 67,936,876,000 | $ 66,920,537,000 | $ 63,691,855,000 |  |
Interest rate risk [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Increase in basis points |  | 1.00% |  |  |  |
Increase in net interest expense |  | $ 32,136,984,000 |  |  |  |
Increase (decrease) in interest expense |  | $ (31,773,439,000) |  |  |  |
Currency risk [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Fluctuation in exchange rates |  | 5.00% |  |  |  | 5.00%
Increase (decrease) in interest expense |  | $ 638,922,453,000 |  |  |  |
Increase (decrease) through changes in foreign exchange rates, regulatory deferral account credit balances |  | 3,165,958,000 |  |  |  |
Increase (decrease) through changes in discount rates, regulatory deferral account credit balances |  | $ (10,940,798,000) |  |  |  |
Increase/(decrease) in exchange rates |  | 5.00% |  |  |  |
Bottom of range [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Term of selling equipment under financing model |  | 12 months |  |  |  |
Top of range [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Term of selling equipment under financing model |  | 36 months |  |  |  |
U.S.A. [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Closing exchange rate |  |  |  |  | 18.9701 |
Argentina [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Closing exchange rate |  | 0.5221 | 1.0610 |  |  | 0.5221
Argentina [member] | Impact of application of hyperinflation adjustments in 2018 [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Cumulative inflation percentage |  | 100.00% |  |  |  |
Cumulative inflation period |  | 3 years |  |  |  |
U.S.A. [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Closing exchange rate |  | 19.6829 | 19.7867 |  |  | 19.6829
Cumulative translation adjustment [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Cumulative translation (loss) gain |  | $ (53,357,300,000) | $ 7,866,158,000 |  |  |
Licenses and rights of use [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Intangibles useful life |  | Licenses are amortized when the Company does not have a basis to conclude that they are indefinite lived. Licenses are amortized using the straight-line method over a period ranging from 3 to 30 years, which represents the usage period of the assets. |  |  |  |
Licenses and rights of use [member] | Bottom of range [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Estimated useful lives |  | 3 years |  |  |  |
Licenses and rights of use [member] | Top of range [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Estimated useful lives |  | 30 years |  |  |  |
Trademarks [member] | Bottom of range [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Estimated useful lives |  | 1 year |  |  |  |
Trademarks [member] | Top of range [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Estimated useful lives |  | 10 years |  |  |  |
Customer relationships [member] |  |  |  |  |  |
Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices [line items] |  |  |  |  |  |
Intangibles useful life |  | Amortized on a 5 year period. |  |  |  |
Estimated useful lives |  | 5 years |  |  |  |

X
- Definition Adjustments for assumption of weighted average cost of capital. + References No definition available. + Details
Name: | amx_AdjustmentsForAssumptionOfWeightedAverageCostOfCapital
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Adjustments of sensitivity analysis long-life assets. + References No definition available. + Details
Name: | amx_AdjustmentsOfSensitivityAnalysisLongLifeAssets
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Advertising expense1. + References No definition available. + Details
Name: | amx_AdvertisingExpense1
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Concentration risks percentage. + References No definition available. + Details
Name: | amx_ConcentrationRisksPercentage
Namespace Prefix: | amx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Cumulative index ratio. + References No definition available. + Details
Name: | amx_CumulativeIndexRatio
Namespace Prefix: | amx_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cumulative inflation percentage. + References No definition available. + Details
Name: | amx_CumulativeInflationPercentage
Namespace Prefix: | amx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cumulative inflation period. + References No definition available. + Details
Name: | amx_CumulativeInflationPeriod
Namespace Prefix: | amx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of estimation of impairment cash-generating unit. + References No definition available. + Details
Name: | amx_DescriptionOfEstimationOfImpairmentCashGeneratingUnit
Namespace Prefix: | amx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of basis of preparation of consolidated financial statements and summary of significant accounting policies and practices. + References No definition available. + Details
Name: | amx_DisclosureOfBasisOfPreparationOfConsolidatedFinancialStatementsAndSummaryOfSignificantAccountingPoliciesAndPracticesLineItems
Namespace Prefix: | amx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated useful lives of intangible asset. + References No definition available. + Details
Name: | amx_EstimatedUsefulLivesOfIntangibleAsset
Namespace Prefix: | amx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Impairment losses impacted the carrying amount of debt instruments at fair value through other comprehensive income. + References No definition available. + Details
Name: | amx_ImpairmentLossesImpactedTheCarryingAmountOfDebtInstrumentsAtFairValueThroughOtherComprehensiveIncome
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase decrease exchange rate. + References No definition available. + Details
Name: | amx_IncreaseDecreaseExchangeRate
Namespace Prefix: | amx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase (decrease) in basis points. + References No definition available. + Details
Name: | amx_IncreaseDecreaseInBasisPoints
Namespace Prefix: | amx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase decrease in interest rate. + References No definition available. + Details
Name: | amx_IncreaseDecreaseInInterestRate
Namespace Prefix: | amx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Increase in weighted average cost of capital basis. + References No definition available. + Details
Name: | amx_IncreaseInWeightedAverageCostOfCapitalBasis
Namespace Prefix: | amx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segment. + References No definition available. + Details
Name: | amx_NumberOfSegment
Namespace Prefix: | amx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of annual basis index. + References No definition available. + Details
Name: | amx_PercentageOfAnnualBasisIndex
Namespace Prefix: | amx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of contribution to defined benefit plan equal to employee aggregate salary. + References No definition available. + Details
Name: | amx_PercentageOfContributionToDefinedBenefitPlanEqualToEmployeeAggregateSalary
Namespace Prefix: | amx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of employee profit sharing based on individual company taxable income. + References No definition available. + Details
Name: | amx_PercentageOfEmployeeProfitSharingBasedOnIndividualCompanyTaxableIncome
Namespace Prefix: | amx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of operating revenue as percentage of total assets. + References No definition available. + Details
Name: | amx_PercentageOfOperatingRevenueAsPercentageOfTotalAssets
Namespace Prefix: | amx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of sensitivity analysis for increase in capital expenditures. + References No definition available. + Details
Name: | amx_PercentageOfSensitivityAnalysisForIncreaseInCapitalExpenditures
Namespace Prefix: | amx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Term of selling equipment under financing model + References No definition available. + Details
Name: | amx_TermOfSellingEquipmentUnderFinancingModel
Namespace Prefix: | amx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of accumulated items of income and expense (including reclassification adjustments) that are not recognised in profit or loss as required or permitted by other IFRSs. [Refer: IFRSs [member]; Other comprehensive income] + 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_AccumulatedOtherComprehensiveIncome
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2018-01-01 -Paragraph 26 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=23&date=2018-03-01&anchor=para_26_a&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_BorrowingCostsCapitalised
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
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 spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + 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_ClosingForeignExchangeRate
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of the exposure to credit risk on loan commitments and financial guarantee contracts. [Refer: Loan commitments [member]; Financial guarantee contracts [member]; Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35I&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35M&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ExposureToCreditRiskOnLoanCommitmentsAndFinancialGuaranteeContracts
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_d_ii&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ImpairmentLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B67 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B67_d_v&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
Name: | ifrs-full_ImpairmentLossRecognisedInProfitOrLossGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of impairment loss recognised in profit or loss for intangible assets other than goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_iv&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of impairment loss recognised in profit or loss for trade receivables. [Refer: Impairment loss recognised in profit or loss; Trade receivables] + 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_ImpairmentLossRecognisedInProfitOrLossTradeReceivables
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) in regulatory deferral account credit balances resulting from changes in discount rates. [Refer: Regulatory deferral account credit balances] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 14 -IssueDate 2018-01-01 -Paragraph 33 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=14&date=2018-03-01&anchor=para_33_a_iii&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_IncreaseDecreaseThroughChangesInDiscountRatesRegulatoryDeferralAccountCreditBalances
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in regulatory deferral account credit balances resulting from changes in foreign exchange rates. [Refer: Regulatory deferral account credit balances] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 14 -IssueDate 2018-01-01 -Paragraph 33 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=14&date=2018-03-01&anchor=para_33_a_iii&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_IncreaseDecreaseThroughChangesInForeignExchangeRatesRegulatoryDeferralAccountCreditBalances
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in exposure to credit risk on loan commitments and financial guarantee contracts resulting from foreign exchange. [Refer: Exposure to credit risk on loan commitments and financial guarantee contracts] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph IG20B -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_IG20B&doctype=Implementation%20Guidance -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_IncreaseDecreaseThroughForeignExchangeExposureToCreditRiskOnLoanCommitmentsAndFinancialGuaranteeContracts
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage of the entity's revenue. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_34&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_PercentageOfEntitysRevenue
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of expense from employee benefits (other than termination benefits) that are expected to be settled wholly within twelve months after the end of the annual reporting period in which the employees render the related services. + 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_ShorttermEmployeeBenefitsExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The useful lives or amortisation rates used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_a&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_UsefulLivesOrAmortisationRatesIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | amx_IncomeStatementLocationAxis=amx_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | amx_IncomeStatementLocationAxis=amx_CommercialAdministrationAndGeneralExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_InterestRateRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis=amx_ImpactOfApplicationOfHyperinflationAdjustmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_LicencesAndFranchisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=amx_Trademarks1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_CustomerrelatedIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |