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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, 2018	Dec. 31, 2017
Assets:
Financial Assets	$ 257,974,604	$ 294,846,664
Liabilities:
Financial Liabilities	711,544,172	769,276,398
Debt [member]
Liabilities:
Financial Liabilities	694,436,593	754,916,938
Financial instruments, class [member]
Liabilities:
Financial Liabilities	17,107,579	14,359,460
Equity investments at fair value through OCI and other short term investments [member]
Assets:
Financial Assets	49,015,934	59,120,676
Pension plan assets [member]
Assets:
Financial Assets	203,671,122	227,688,604
Derivative Financial Instruments [Member]
Assets:
Financial Assets	5,287,548	8,037,384
Level 1 [member]
Assets:
Financial Assets	225,585,814	265,201,015
Liabilities:
Financial Liabilities	594,713,342	691,769,785
Level 1 [member] | Debt [member]
Liabilities:
Financial Liabilities	594,713,342	691,769,785
Level 1 [member] | Equity investments at fair value through OCI and other short term investments [member]
Assets:
Financial Assets	39,028,083	46,682,657
Level 1 [member] | Pension plan assets [member]
Assets:
Financial Assets	186,557,731	218,518,358
Level 2 [member]
Assets:
Financial Assets	32,371,743	29,514,673
Liabilities:
Financial Liabilities	116,830,830	77,506,613
Level 2 [member] | Debt [member]
Liabilities:
Financial Liabilities	99,723,251	63,147,153
Level 2 [member] | Financial instruments, class [member]
Liabilities:
Financial Liabilities	17,107,579	14,359,460
Level 2 [member] | Equity investments at fair value through OCI and other short term investments [member]
Assets:
Financial Assets	9,987,851	12,438,019
Level 2 [member] | Pension plan assets [member]
Assets:
Financial Assets	17,096,344	9,039,270
Level 2 [member] | Derivative Financial Instruments [Member]
Assets:
Financial Assets	5,287,548	8,037,384
Level 3 [member]
Assets:
Financial Assets	17,047	130,976
Level 3 [member] | Pension plan assets [member]
Assets:
Financial Assets	$ 17,047	$ 130,976

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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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