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Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Summary of Reconciliation of Operating Lease Commitments to Lease liabilities (Detail) - MXN ($) $ in Thousands | Jan. 01, 2019 | Dec. 31, 2019
--- | --- | ---
Statement [line items] |  |
Operating lease commitments as of December 31, 2018 | $ 137,949,821 |
Lease commitments not in scope of IFRS 16 | (29,624,063) |
Lease payments not included in the operating lease commitments as at 31 December 2018, resulting from differences between IAS 17 and IFRS 16 at implementation date | 60,064,406 |
Short-term leases and leases of low-value assets | (5,498,423) |
Effect of discounting | (43,504,081) |
Lease liabilities | $ 119,387,660 | $ 120,596,733

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- Definition Expense relating to short-term leases and leases of low value assets. + References No definition available. + Details
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Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Lease Commitments Not In Scope Of IFRS 16. + References No definition available. + Details
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Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Lease Payments Not Included In Operating Lease Commitments. + References No definition available. + Details
Name: | amx_LeasePaymentsNotIncludedInOperatingLeaseCommitments
Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Operating lease commitments. + References No definition available. + Details
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Namespace Prefix: | amx_
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Balance Type: | credit
Period Type: | instant

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- Definition Operating Lease Commitments, Undiscounted Excess Amount. + References No definition available. + Details
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Namespace Prefix: | amx_
Data Type: | xbrli:monetaryItemType
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | amx_
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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