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Financial instruments and risk management - Interest rate risk (Details) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018 MXN ($)	Dec. 31, 2017 MXN ($)	Dec. 31, 2016 MXN ($) USD ($)
Interest rate risk
Derivative financial liabilities	$ 122,948		$ 14,144
Loss on cash flow hedges	455,009	$ (52,097)	$ (353,943)
Interest rate swap contracts
Interest rate risk
Notional amount (in USD)			70
Derivative financial liabilities	$ 0	0	$ 14,144
Loss on cash flow hedges		$ 13,827	$ 48,777

X

- Definition

The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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.

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- Definition

The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2018-01-01
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