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Financial Assets and Liabilities - Summary of Fair Value for Financial Assets (Excluding Cash and Cash Equivalents) and Financial Liabilities (Detail) - MXN ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets:
Financial Assets	$ 294,846,664	$ 278,111,829
Liabilities:
Financial Liabilities	769,276,398	764,256,816
Debt [member]
Liabilities:
Financial Liabilities	754,916,938	746,672,069
Financial instruments, class [member]
Liabilities:
Financial Liabilities	14,359,460	17,584,747
Available for sale marketable securities and other short term investments [member]
Assets:
Financial Assets	59,120,676	54,857,157
Accounts receivable from subscribers, distributors, and other, net [member]
Assets:
Financial Assets	8,037,384	909,051
Pension plan assets [member]
Assets:
Financial Assets	227,688,604	222,345,621
Level 1 [member]
Assets:
Financial Assets	265,201,015	255,515,204
Liabilities:
Financial Liabilities	691,769,785	666,457,233
Level 1 [member] | Debt [member]
Liabilities:
Financial Liabilities	691,769,785	666,457,233
Level 1 [member] | Available for sale marketable securities and other short term investments [member]
Assets:
Financial Assets	46,682,657	41,463,511
Level 1 [member] | Pension plan assets [member]
Assets:
Financial Assets	218,518,358	214,051,693
Level 2 [member]
Assets:
Financial Assets	29,514,673	22,478,166
Liabilities:
Financial Liabilities	77,506,613	97,799,583
Level 2 [member] | Debt [member]
Liabilities:
Financial Liabilities	63,147,153	80,214,836
Level 2 [member] | Financial instruments, class [member]
Liabilities:
Financial Liabilities	14,359,460	17,584,747
Level 2 [member] | Available for sale marketable securities and other short term investments [member]
Assets:
Financial Assets	12,438,019	13,393,646
Level 2 [member] | Accounts receivable from subscribers, distributors, and other, net [member]
Assets:
Financial Assets	8,037,384	909,051
Level 2 [member] | Pension plan assets [member]
Assets:
Financial Assets	9,039,270	8,175,469
Level 3 [member]
Assets:
Financial Assets	130,976	118,459
Level 3 [member] | Pension plan assets [member]
Assets:
Financial Assets	$ 130,976	$ 118,459

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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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