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Employee Benefits, Plan Assets Invested (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Plan Assets [Abstract] |  |  |
Re-measurement value of defined pension plan | $ (16,451,061) | $ (15,414,937) | $ (13,688,645)
Telmex's [Member] |  |  |
Plan Assets [Abstract] |  |  |
Plan assets included in net pension liability | $ 159,328,024 | $ 175,265,188 |
Percentage of equity and debt instruments | 45.80% | 49.30% |
Re-measurement value of defined pension plan | $ 33,858,384 | $ 3,396,589 |
Increase (decrease) in fair value of related party pension plan investments | $ 21,428,270 | $ (6,965,748) |
Puerto Rico [Member] |  |  |
Plan Assets [Abstract] |  |  |
Equity instruments | 53.00% | 42.00% |
Debt instruments | 12.00% | 23.00% |
Others | 35.00% | 35.00% |
Total | 100.00% | 100.00% |
Brazil [Member] |  |  |
Plan Assets [Abstract] |  |  |
Equity instruments | 0.00% | 0.00% |
Debt instruments | 93.00% | 91.00% |
Others | 7.00% | 9.00% |
Total | 100.00% | 100.00% |
Mexico [Member] |  |  |
Plan Assets [Abstract] |  |  |
Equity instruments | 76.00% | 76.00% |
Debt instruments | 24.00% | 24.00% |
Others | 0.00% | 0.00% |
Total | 100.00% | 100.00% |

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- Definition The fair value of defined benefit plan assets (liabilities). Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References No definition available. + Details
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- Definition The percentage instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Debt instruments, amount contributed to fair value of plan assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 142 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_142_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The percentage equity instruments contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Equity instruments, amount contributed to fair value of plan assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 142 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_142_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The percentage other types of assets not separately disclosed contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Other assets, amount contributed to fair value of plan assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 142 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_142&doctype=Standard -URIDate 2024-03-27 + Details
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