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Post-employment Benefits - Reconciliation (Details) - MXN ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Post-employment benefit plans |  |  |
Vested benefit obligations | $ 719,188 | $ 653,415 |
Unvested benefit obligations | 1,699,965 | 1,860,820 |
Defined benefit obligation | 2,419,153 | 2,514,235 |
Fair value of plan assets | 1,703,058 | 1,993,762 |
Underfunded (overfunded) status of the plan assets | 716,095 | 520,473 |
Post-employment benefit liability (asset) | 716,095 | 520,473 | $ 407,179
Pensions |  |  |
Post-employment benefit plans |  |  |
Vested benefit obligations | 394,788 | 332,024 |
Unvested benefit obligations | 1,579,238 | 1,734,605 |
Defined benefit obligation | 1,974,026 | 2,066,629 |
Fair value of plan assets | 1,240,732 | 1,381,896 |
Underfunded (overfunded) status of the plan assets | 733,294 | 684,733 |
Post-employment benefit liability (asset) | 733,294 | 684,733 |
Seniority Premiums |  |  |
Post-employment benefit plans |  |  |
Vested benefit obligations | 324,400 | 321,391 |
Unvested benefit obligations | 120,727 | 126,215 |
Defined benefit obligation | 445,127 | 447,606 |
Fair value of plan assets | 462,326 | 611,866 |
Underfunded (overfunded) status of the plan assets | (17,199) | (164,260) |
Post-employment benefit liability (asset) | $ (17,199) | $ (164,260) |

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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 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The present value of the defined benefit obligation, less the fair value of the plan assets (if any). [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_57_a&doctype=Standard -URIDate 2017-03-09 + 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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