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Post-employment Benefits - Reconciliation (Details) - MXN ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Post-employment benefit plans |  |  |
Vested benefit obligations | $ 932,741 | $ 788,714 |
Unvested benefit obligations | 2,343,659 | 2,058,894 |
Defined benefit obligation | 3,276,400 | 2,847,608 |
Fair value of plan assets | 1,195,749 | 1,379,496 |
Underfunded status of the plan assets | 2,080,651 | 1,468,112 |
Post-employment benefit liability (asset) | 2,080,651 | 1,468,112 | $ 962,497
Pensions |  |  |
Post-employment benefit plans |  |  |
Vested benefit obligations | 556,619 | 449,752 |
Unvested benefit obligations | 2,077,506 | 1,890,108 |
Defined benefit obligation | 2,634,125 | 2,339,860 |
Fair value of plan assets | 909,324 | 1,051,076 |
Underfunded status of the plan assets | 1,724,801 | 1,288,784 |
Post-employment benefit liability (asset) | 1,724,801 | 1,288,784 |
Seniority Premiums |  |  |
Post-employment benefit plans |  |  |
Vested benefit obligations | 376,122 | 338,962 |
Unvested benefit obligations | 266,153 | 168,786 |
Defined benefit obligation | 642,275 | 507,748 |
Fair value of plan assets | 286,425 | 328,420 |
Underfunded status of the plan assets | 355,850 | 179,328 |
Post-employment benefit liability (asset) | $ 355,850 | $ 179,328 |

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- 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 -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition 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. + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_140_a&doctype=Standard -URIDate 2020-01-01 + Details
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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 -Number 19 -IssueDate 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The unvested 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. + References No definition available. + Details
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