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Post-employment Benefits - Funded status (Details) - MXN ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Post-employment pension plans. |  |  |
Unfunded status of the plan assets | $ 1,468,112 | $ 962,497 | $ 716,095
Pensions |  |  |
Post-employment pension plans. |  |  |
Unfunded status of the plan assets | 1,288,784 | 926,050 |
Seniority Premiums |  |  |
Post-employment pension plans. |  |  |
Unfunded status of the plan assets | $ 179,328 | $ 36,447 |

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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 2019-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_140_a&doctype=Standard -URIDate 2019-03-27 + Details
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