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Bank Loans and Notes Payables - Summary of Interest Expense (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 MXN ($)	Dec. 31, 2017 USD ($)	[1]	Dec. 31, 2016 MXN ($)	Dec. 31, 2015 MXN ($)
Disclosure of detailed information about borrowings [abstract]
Interest on debts and borrowings	$ 6,409			$ 5,694	$ 4,586
Capitalized interest	(10)			(32)	(60)
Finance charges for employee benefits	317			282	276
Derivative instruments	4,339			3,519	2,894
Finance operating charges	69			183	79
Finance charges payable under finance leases					2
Total	$ 11,124	$ 566		$ 9,646	$ 7,777
[1] Convenience translation to U.S. dollars ($) - See Note 2.2.3

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Finance charges for employee benefits.

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Finance operating charges.

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

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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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The amount of interest expense on finance leases. [Refer: Interest expense]

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