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Summary of Interest Expense - Bank Loans and Notes Payables (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 detailed information about borrowings [abstract]
Interest on debts and borrowings	$ 4,369		$ 4,099	$ 3,540
Capitalized interest			(32)	(60)
Finance charges for employee benefits	182		154	155
Derivative instruments	4,161		3,082	2,619
Finance operating charges	97		168	83
Interest Expense	$ 8,809	$ 449	$ 7,471	$ 6,337

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The gains (losses) on hedging instruments in fair value hedges. [Refer: Fair value hedges [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset.

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The amount of expense arising from interest.

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The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings]

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Finance charges for employee benefits.

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Finance operating charges.

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