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Financial Instruments - Summary of Outstanding Interest Rate Swap Agreements (Detail) - MXN ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Fair Value Asset	$ 955,000,000	$ 4,615,000,000
Interest rate swap contract [member] | 2019 [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2019
Notional Amount	$ 4,024,000,000
Fair value liiability	(32,000,000)
Fair Value Asset	$ 0
Interest rate swap contract [member] | 2020 [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2020
Notional Amount	$ 3,669,000,000
Fair value liiability	(16,000,000)
Fair Value Asset	$ 0
Interest rate swap contract [member] | 2021 [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2021
Notional Amount	$ 3,059,000,000
Fair value liiability	(33,000,000)
Fair Value Asset	$ 0

X

- Definition

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

+ References

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- Definition

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