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Post-employment Benefits - Fair value of plan assets (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Post-employment pension plans. |  |
Beginning of year | $ 520,473 | $ 407,179
Remeasurement return on plan assets | 124,655 | 128,365
Benefits paid | 247,940 | 115,882
End of year | 716,095 | 520,473
Pensions |  |
Post-employment pension plans. |  |
Beginning of year | 684,733 |
Benefits paid | 154,921 |
End of year | 733,294 | 684,733
Seniority Premiums |  |
Post-employment pension plans. |  |
Beginning of year | (164,260) |
Benefits paid | 93,019 |
End of year | (17,199) | (164,260)
Plan assets |  |
Post-employment pension plans. |  |
Beginning of year | (1,993,762) | (2,064,546)
Remeasurement return on plan assets | 124,655 | 128,365
Remeasurement of post-employment benefit obligations | (93,809) | (70,471)
Benefits paid | (321,550) | (128,678)
End of year | (1,703,058) | (1,993,762)
Plan assets | Pensions |  |
Post-employment pension plans. |  |
Beginning of year | (1,381,896) |
Remeasurement return on plan assets | 85,430 |
Remeasurement of post-employment benefit obligations | (73,870) |
Benefits paid | (152,724) |
End of year | (1,240,732) | (1,381,896)
Plan assets | Seniority Premiums |  |
Post-employment pension plans. |  |
Beginning of year | (611,866) |
Remeasurement return on plan assets | 39,225 |
Remeasurement of post-employment benefit obligations | (19,939) |
Benefits paid | (168,826) |
End of year | $ (462,326) | $ (611,866)

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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 2017-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_iii&doctype=Standard -URIDate 2017-03-09 + 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 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 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 2017-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_g&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_i&doctype=Standard -URIDate 2017-03-09 + Details
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