XML 164 R91.htm IDEA: XBRL DOCUMENT
v3.21.1

Income Taxes - Summary of Analysis of Temporary Differences Giving Rise to Net Deferred Tax Liability (Detail) - MXN ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | $ 66,303,077 | $ 88,074,856 | $ 86,613,327 | $ 104,573,985
Deferred tax expense in net profit for the year | 12,292,014 | (3,894,383) | 1,994,063 |
Provisions [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 19,312,081 | 17,964,305 |  |
Deferred tax expense in net profit for the year | 4,458,848 | (257,070) | 1,841,705 |
Deferred revenues [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 6,748,101 | 5,820,260 |  |
Deferred tax expense in net profit for the year | 897,762 | (1,077,259) | 3,632,051 |
Tax losses carry forward [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 25,121,933 | 26,630,407 |  |
Deferred tax expense in net profit for the year | 2,236,244 | (9,873) | (5,833,660) |
Property, plant and equipment [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | (39,459,549) | (11,962,544) |  |
Deferred tax expense in net profit for the year | 3,524,761 | (461,594) | 453,493 |
Inventories [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | (537,404) | 1,787,065 |  |
Deferred tax expense in net profit for the year | (2,393,979) | (291,531) | 81,270 |
Licenses and rights of use [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | (5,177,924) | (3,399,931) |  |
Deferred tax expense in net profit for the year | 344,729 | 432,403 | 961,402 |
Employee benefits [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 45,467,827 | 41,743,744 |  |
Deferred tax expense in net profit for the year | 422,473 | (1,019,042) | 1,128,209 |
Other [member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Net deferred tax assets | 14,828,012 | 9,491,550 |  |
Deferred tax expense in net profit for the year | $ 2,801,176 | $ (1,210,417) | $ (270,407) |

X
- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_DeferredTaxLiabilityAsset
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=amx_NetDeferredTaxAssetsLiabilityRelatingToProvisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=amx_NetDeferredTaxAssetsLiabilitiesDeferredRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=amx_NetDeferredTaxAssetsLiabilitiesTaxLossCarryForwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=amx_NetDeferredTaxAssetsLiabilitiesPropertyAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=amx_NetDeferredTaxAssetsLiabilitiesInventoriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=amx_NetDeferredTaxAssetsLiabilitiesLicensesAndRightsOfUseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=amx_NetDeferredTaxAssetsLiabilitiesEmployeeBenefitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis=amx_NetDeferredTaxAssetsLiabilitiesOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |