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Financial Instruments - Summary of Consolidated Net Monetary Assets (Liabilities) by Currency (Detail) - MXN ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Monetary assets	$ 57,723	$ 80,739
Monetary liabilities	340,455	383,597
Net monetary assets (liabilities)	(282,732)	(302,858)
US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(157,203)	(221,260)
Pesos [Member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(12,327)	(3,212)
Euro [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(68,605)	(57,935)
Pounds [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(28,477)	(14,408)
Other Currencies [Member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(16,120)	(6,043)
Mexico [member]
Disclosure of detailed information about financial instruments [line items]
Monetary assets	11,798	10,261
Monetary liabilities	17,505	10,564
Net monetary assets (liabilities)	(5,707)	(303)
Mexico [member] | US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(1,097)	(483)
Mexico [member] | Pesos [Member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(4,610)	180
Mexico [member] | Euro [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	0	0
Mexico [member] | Pounds [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	0	0
Mexico [member] | Other Currencies [Member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	0	0
United States [member]
Disclosure of detailed information about financial instruments [line items]
Monetary assets	9,453	26,685
Monetary liabilities	32,158	33,145
Net monetary assets (liabilities)	(22,705)	(6,460)
United States [member] | US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(22,710)	(6,463)
United States [member] | Pesos [Member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	4	3
United States [member] | Euro [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	0	0
United States [member] | Pounds [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	0	0
United States [member] | Other Currencies [Member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	1	0
Europe [member]
Disclosure of detailed information about financial instruments [line items]
Monetary assets	14,182	12,724
Monetary liabilities	45,675	42,336
Net monetary assets (liabilities)	(31,493)	(29,612)
Europe [member] | US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	39	38
Europe [member] | Pesos [Member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	24	0
Europe [member] | Euro [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(10,155)	(9,465)
Europe [member] | Pounds [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(19,358)	(14,408)
Europe [member] | Other Currencies [Member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(2,043)	(5,777)
South, Central America And Caribbean [Member]
Disclosure of detailed information about financial instruments [line items]
Monetary assets	7,347	6,132
Monetary liabilities	12,016	9,130
Net monetary assets (liabilities)	(4,669)	(2,998)
South, Central America And Caribbean [Member] | US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(126)	35
South, Central America And Caribbean [Member] | Pesos [Member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	0	0
South, Central America And Caribbean [Member] | Euro [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	2	0
South, Central America And Caribbean [Member] | Pounds [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	0	0
South, Central America And Caribbean [Member] | Other Currencies [Member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(4,545)	(3,033)
Asia, Middle East and Africa [member]
Disclosure of detailed information about financial instruments [line items]
Monetary assets	9,780	13,101
Monetary liabilities	11,522	11,305
Net monetary assets (liabilities)	(1,742)	1,796
Asia, Middle East and Africa [member] | US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	221	364
Asia, Middle East and Africa [member] | Pesos [Member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	0	0
Asia, Middle East and Africa [member] | Euro [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	0	0
Asia, Middle East and Africa [member] | Pounds [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	0	0
Asia, Middle East and Africa [member] | Other Currencies [Member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(1,963)	1,432
Other Operations [Member]
Disclosure of detailed information about financial instruments [line items]
Monetary assets	5,163	11,836
Monetary liabilities	221,579	277,117
Net monetary assets (liabilities)	(216,416)	(265,281)
Other Operations [Member] | US Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(133,530)	(214,751)
Other Operations [Member] | Pesos [Member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(7,745)	(3,395)
Other Operations [Member] | Euro [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(58,452)	(48,470)
Other Operations [Member] | Pounds [member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	(9,119)	0
Other Operations [Member] | Other Currencies [Member]
Disclosure of detailed information about financial instruments [line items]
Net monetary assets (liabilities)	$ (7,570)	$ 1,335

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) 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 receive 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 the entity’s own equity instruments do not include puttable financial instruments 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. [Refer: Financial instruments, class [member]; Financial liabilities]

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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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