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Accounts Receivable from Subscribers, Distributors, Recoverable Taxes Contractual Assets and Other, Net - Summary of Accounts Receivable From Subscribers and Distributors Included in Impairments of Trade Receivables (Detail) - Receivable from subscribers and distributors [member] - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of accounts receivable [line items] |  |
Allowance for bad debts | $ 40,798,025 | $ 39,044,925
1 - 90 days [member] |  |
Disclosure of accounts receivable [line items] |  |
Allowance for bad debts | 4,079,803 | 3,807,945
Greater than 90 days [member] |  |
Disclosure of accounts receivable [line items] |  |
Allowance for bad debts | $ 36,718,222 | $ 35,236,980

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- Definition Disclosure Of Accounts Receivable [line items] + References No definition available. + Details
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Namespace Prefix: | amx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Impairment allowances for trade receivables. + 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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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MaturityAxis=amx_LaterThanNinetyDaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |