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Post-employment Benefits - Sensitivity (Details) - MXN ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Sensitivity analysis
Discount rate (as a percent)	7.60%	6.70%
Discount rate
Sensitivity analysis
Decrease in actuarial assumption (in basis points)	0.50%	0.50%
Increase in actuarial assumption	$ 2,552,709	$ 2,630,659

X

- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

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- Definition

The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

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