Balances and Transactions in Foreign Currencies - Summary of Transactions Denominated in Foreign Currencies, Expressed in Mexican pesos (Detail) $ in Millions, $ in Millions	12 Months Ended
Dec. 31, 2017 MXN ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 MXN ($)	Dec. 31, 2015 MXN ($)
Disclosure of Balances and Transactions in Foreign Currencies [Line Items]
Revenues	$ 203,780	$ 10,376	$ 177,718	$ 152,360
Interest expense	8,809	$ 449	7,471	6,337
U.S. dollars [member]
Disclosure of Balances and Transactions in Foreign Currencies [Line Items]
Revenues	653		736	569
Purchases of Raw Materials	13,381		13,242	11,458
Interest expense	2,454		2,235	1,965
Other	1,544		$ 1,796	$ 1,301
Euros [member]
Disclosure of Balances and Transactions in Foreign Currencies [Line Items]
Purchases of Raw Materials	$ 18

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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