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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, 2018	Dec. 31, 2017
Financial Assets:
Financial Assets	$ 257,974,604	$ 294,846,664
Financial Liabilities:
Financial Liabilities	711,544,172	769,276,398
Loans and receivables [member]
Financial Assets:
Financial Assets	196,453,950	176,391,786
Loans and receivables [member] | Related parties [member]
Financial Assets:
Financial Assets	1,263,605	868,230
Fair value through profit or loss [member]
Financial Assets:
Financial Assets	5,287,548	8,037,384
Fair value through OCI [member]
Financial Assets:
Financial Assets	39,028,083	46,682,657
Equity investments at fair value through OCI and other short term investments [member]
Financial Assets:
Financial Assets	49,015,934	59,120,676
Equity investments at fair value through OCI and other short term investments [member] | Loans and receivables [member]
Financial Assets:
Financial Assets	9,987,851	12,438,019
Equity investments at fair value through OCI and other short term investments [member] | Fair value through OCI [member]
Financial Assets:
Financial Assets	39,028,083	46,682,657
Accounts receivable from subscribers distributors contractual assets and other net [member] | Loans and receivables [member]
Financial Assets:
Financial Assets	185,202,494	163,085,537
Financial instruments, class [member]
Financial Liabilities:
Financial Liabilities	17,107,579	14,359,460
Financial instruments, class [member] | Fair value through profit or loss [member]
Financial Assets:
Financial Assets	5,287,548	8,037,384
Loans and receivables [member]
Financial Liabilities:
Financial Liabilities	863,853,933	913,098,718
Loans and receivables [member] | Related parties [member]
Financial Liabilities:
Financial Liabilities	2,974,213	2,540,412
Loans and receivables [member] | Equity investments at fair value through OCI and other short term investments [member]
Financial Liabilities:
Financial Liabilities	638,922,453	697,884,899
Loans and receivables [member] | Accounts receivable from subscribers distributors contractual assets and other net [member]
Financial Liabilities:
Financial Liabilities	221,957,267	212,673,407
Fair value through profit or loss [Member]
Financial Liabilities:
Financial Liabilities	17,107,579	14,359,460
Fair value through profit or loss [Member] | Financial instruments, class [member]
Financial Liabilities:
Financial Liabilities	$ 17,107,579	$ 14,359,460

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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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