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v3.19.1

Basis of Preparation of the Consolidated Financial Statements and Summary of Significant Accounting Policies and Practices - Schedule of Estimate Impairment Evaluations (Parenthetical) (Detail) - Country | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of impairment of assets [line items] |  |
Number of countries | 25 |
Europe [member] |  |
Disclosure of impairment of assets [line items] |  |
Number of countries | 7 | 7

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- Definition Disclosure of Impairment of Assets [line items] + References No definition available. + Details
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- Definition Number of countries in which entity operates2. + References No definition available. + Details
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Namespace Prefix: | amx_
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Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |