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Post-employment Benefits - Post-employment benefits (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Post-employment benefit plans
Defined benefit obligation	$ 2,847,608	$ 2,477,527
Plan assets	1,379,496	1,515,030
Unfunded status of plans	1,468,112	962,497
Remeasurement adjustments	247,092	97,086
Pensions
Post-employment benefit plans
Defined benefit obligation	2,339,860	2,034,226
Plan assets	1,051,076	1,108,176
Unfunded status of plans	1,288,784	926,050
Remeasurement adjustments	183,002	70,861
Seniority Premiums
Post-employment benefit plans
Defined benefit obligation	507,748	443,301
Plan assets	328,420	406,854
Unfunded status of plans	179,328	36,447
Remeasurement adjustments	$ 64,090	$ 26,225

X

- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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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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- 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
-Name IAS
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-Paragraph 57
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- Definition

The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]]

+ References

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