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Financial Assets and Liabilities - Summary of Categorization of Financial Instruments, Excluding Cash and Cash Equivalents (Detail) - MXN ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financial Assets:
Financial Assets	$ 294,846,664	$ 278,111,829
Financial Liabilities:
Financial Liabilities	769,276,398	764,256,816
Loans and receivables [member]
Financial Assets:
Financial Assets	176,391,786	189,194,019
Loans and receivables [member] | Related parties [member]
Financial Assets:
Financial Assets	868,230	740,492
Fair value through profit or loss [member]
Financial Assets:
Financial Assets	8,037,384	909,051
Fair value through OCI [member]
Financial Assets:
Financial Assets	46,682,657	41,463,511
Available for sale marketable securities and other short term investments [member]
Financial Assets:
Financial Assets	59,120,676	54,857,157
Available for sale marketable securities and other short term investments [member] | Loans and receivables [member]
Financial Assets:
Financial Assets	12,438,019	13,393,646
Available for sale marketable securities and other short term investments [member] | Fair value through OCI [member]
Financial Assets:
Financial Assets	46,682,657	41,463,511
Accounts receivable from subscribers, distributors, and other, net [member]
Financial Assets:
Financial Assets	8,037,384	909,051
Accounts receivable from subscribers, distributors, and other, net [member] | Loans and receivables [member]
Financial Assets:
Financial Assets	163,085,537	175,059,881
Financial instruments, class [member]
Financial Liabilities:
Financial Liabilities	14,359,460	17,584,747
Financial instruments, class [member] | Fair value through profit or loss [member]
Financial Assets:
Financial Assets	8,037,384	909,051
Loans and receivables [member]
Financial Liabilities:
Financial Liabilities	913,098,718	948,037,854
Loans and receivables [member] | Related parties [member]
Financial Liabilities:
Financial Liabilities	2,540,412	2,971,325
Loans and receivables [member] | Available for sale marketable securities and other short term investments [member]
Financial Liabilities:
Financial Liabilities	697,884,899	707,801,403
Loans and receivables [member] | Accounts receivable from subscribers, distributors, and other, net [member]
Financial Liabilities:
Financial Liabilities	212,673,407	237,265,126
Fair value through profit or loss [Member]
Financial Liabilities:
Financial Liabilities	14,359,460	17,504,910
Fair value through profit or loss [Member] | Financial instruments, class [member]
Financial Liabilities:
Financial Liabilities	$ 14,359,460	17,504,910
Fair value through OCI [Member]
Financial Liabilities:
Financial Liabilities		79,837
Fair value through OCI [Member] | Financial instruments, class [member]
Financial Liabilities:
Financial Liabilities		$ 79,837

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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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