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Post-employment Benefits - Benefit obligation (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Post-employment pension plans. |  |
Beginning of year | $ 962,497 | $ 716,095
Service cost | 131,662 | 129,707
Interest cost | 193,344 | 170,653
Benefits paid | (541) | (21,840)
Past service cost | 46,846 | (8,613)
End of year | 1,468,112 | 962,497
Pensions |  |
Post-employment pension plans. |  |
Beginning of year | 926,050 |
Benefits paid | (15,087) |
End of year | 1,288,784 | 926,050
Seniority Premiums |  |
Post-employment pension plans. |  |
Beginning of year | 36,447 |
Benefits paid | 14,546 |
End of year | 179,328 | 36,447
Defined benefit obligation |  |
Post-employment pension plans. |  |
Beginning of year | 2,477,527 | 2,419,153
Service cost | 131,662 | 129,707
Interest cost | 193,344 | 170,653
Benefits paid | (215,474) | (183,496)
Remeasurement of post-employment benefit obligations | 213,703 | (49,877)
Past service cost | 46,846 | (8,613)
End of year | 2,847,608 | 2,477,527
Defined benefit obligation | Pensions |  |
Post-employment pension plans. |  |
Beginning of year | 2,034,226 |
Service cost | 81,483 |
Interest cost | 158,065 |
Benefits paid | (136,962) |
Remeasurement of post-employment benefit obligations | 165,775 |
Past service cost | 37,273 |
End of year | 2,339,860 | 2,034,226
Defined benefit obligation | Seniority Premiums |  |
Post-employment pension plans. |  |
Beginning of year | 443,301 |
Service cost | 50,179 |
Interest cost | 35,279 |
Benefits paid | (78,512) |
Remeasurement of post-employment benefit obligations | 47,928 |
Past service cost | 9,573 |
End of year | $ 507,748 | $ 443,301

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_b&doctype=Standard -URIDate 2019-03-27 + 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 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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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_g&doctype=Standard -URIDate 2019-03-27 + Details
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