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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, 2020	Dec. 31, 2019
Financial Assets:
Financial Assets	$ 374,266,941	$ 260,844,606
Financial Liabilities:
Financial Liabilities	837,915,964	813,864,161
Loans and receivables [member]
Financial Assets:
Financial Assets	177,207,999	207,635,765
Loans and receivables [member] | Related parties [member]
Financial Assets:
Financial Assets	1,391,300	1,273,140
Fair value through profit or loss [member]
Financial Assets:
Financial Assets	20,928,335	6,825,760
Fair value through OCI [member]
Financial Assets:
Financial Assets	50,033,111	37,572,410
Equity investments at fair value through OCI and other short term investments [member]
Financial Assets:
Financial Assets	54,636,395	47,718,025
Equity investments at fair value through OCI and other short term investments [member] | Loans and receivables [member]
Financial Assets:
Financial Assets	4,603,284	10,145,615
Equity investments at fair value through OCI and other short term investments [member] | Fair value through OCI [member]
Financial Assets:
Financial Assets	50,033,111	37,572,410
Accounts receivable from subscribers distributors contractual assets and other net [member] | Loans and receivables [member]
Financial Assets:
Financial Assets	171,213,415	196,217,010
Financial instruments, class [member]
Financial Liabilities:
Financial Liabilities	14,230,249	9,596,751
Financial instruments, class [member] | Fair value through profit or loss [member]
Financial Assets:
Financial Assets	20,928,335	6,825,760
Liability Related to Right of Use of Assets [Member]
Financial Liabilities:
Financial Liabilities	109,327,241	120,596,733
Liability Related to Right of Use of Assets [Member] | Loans and receivables [member]
Financial Liabilities:
Financial Liabilities	109,327,241	120,596,733
Loans and receivables [member]
Financial Liabilities:
Financial Liabilities	928,705,585	964,424,453
Loans and receivables [member] | Related parties [member]
Financial Liabilities:
Financial Liabilities	3,999,916	3,460,419
Loans and receivables [member] | Debt [Member]
Financial Liabilities:
Financial Liabilities	628,382,956	624,254,477
Loans and receivables [member] | Accounts payable [Member]
Financial Liabilities:
Financial Liabilities	186,995,472	216,112,824
Fair value through profit or loss [Member]
Financial Liabilities:
Financial Liabilities	14,230,249	9,596,751
Fair value through profit or loss [Member] | Financial instruments, class [member]
Financial Liabilities:
Financial Liabilities	$ 14,230,249	$ 9,596,751

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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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