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Post-employment Benefits - Post-employment benefits (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Post-employment benefit plans
Defined benefit obligation	$ 2,419,153	$ 2,514,235
Plan assets	1,703,058	1,993,762
Unfunded status of plans	716,095	520,473
Remeasurement adjustments	284,657	282,520
Pensions
Post-employment benefit plans
Defined benefit obligation	1,974,026	2,066,629
Plan assets	1,240,732	1,381,896
Unfunded status of plans	733,294	684,733
Remeasurement adjustments	84,929	181,161
Seniority Premiums
Post-employment benefit plans
Defined benefit obligation	445,127	447,606
Plan assets	462,326	611,866
Unfunded status of plans	(17,199)	(164,260)
Remeasurement adjustments	$ 199,728	$ 101,359

X

- 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
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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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X

- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2017-01-01
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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
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-Number 19
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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

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