Bank Loans and Notes Payables - Summary of Liabilities Arising from Financing Activities (Detail) - MXN ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	$ 139,248	$ 91,864
Cash Flows	(4,531)	21,171
Non-cash flows, Acquisition		386
Non-cash flows, Foreign Exchange movement	5,144	15,740
Non-cash flows, Others	(8,513)	10,086
Ending balance	131,348	139,248
Bank loans [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	14,497	7,357
Cash Flows	(949)	(2,597)
Non-cash flows, Acquisition		377
Non-cash flows, Foreign Exchange movement	190	(50)
Non-cash flows, Others	(69)	9,410
Ending balance	13,669	14,497
Notes payable [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	123,859	83,945
Cash Flows	(3,574)	24,234
Non-cash flows, Foreign Exchange movement	4,954	15,790
Non-cash flows, Others	(7,688)	(110)
Ending balance	117,551	123,859
Lease liabilities [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning balance	892	562
Cash Flows	(8)	(466)
Non-cash flows, Acquisition		9
Non-cash flows, Others	(756)	786
Ending balance	$ 128	$ 892

- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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