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Post-employment Benefits - Fair value of plan assets (Details) - MXN ($) $ in Thousands	12 Months Ended
	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

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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.

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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
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-URIDate 2017-03-09

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X

- 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
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-URIDate 2017-03-09

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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

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