Employee Benefits, Plan Assets Invested (Details) - MXN ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Plan Assets [Abstract]
Re-measurement value of defined pension plan	$ (19,080,852)	$ (16,451,061)	$ (15,414,937)
Telmex's [Member]
Plan Assets [Abstract]
Plan assets included in net pension liability	$ 160,323,036	$ 159,328,024
Percentage of equity and debt instruments	45.30%	45.80%
Re-measurement value of defined pension plan	$ 38,637,097	$ 33,858,384
Increase (decrease) in fair value of related party pension plan investments	$ (6,039,397)	$ 21,428,270
Puerto Rico [Member]
Plan Assets [Abstract]
Equity instruments	59.00%	53.00%
Debt instruments	11.00%	12.00%
Others	30.00%	35.00%
Total	100.00%	100.00%
Brazil [Member]
Plan Assets [Abstract]
Equity instruments	0.00%	0.00%
Debt instruments	94.00%	93.00%
Others	6.00%	7.00%
Total	100.00%	100.00%
Mexico [Member]
Plan Assets [Abstract]
Equity instruments	72.00%	76.00%
Debt instruments	28.00%	24.00%
Others	0.00%	0.00%
Total	100.00%	100.00%

The consolidated percentage of contributed to fair value of plan assets.

No definition available.

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- Definition

The percentage equity and debt instruments contribute to the fair value of defined benefit plan assets.

+ References

No definition available.

+ Details

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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 2025-01-01
-Paragraph 142
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- References

No definition available.

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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 2025-01-01
-Paragraph 142
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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
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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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
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-Number 19
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-URIDate 2025-03-27

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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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