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, 2021	Dec. 31, 2020
Assets:
Financial Assets	$ 451,228,622	$ 374,266,941
Current derivative financial assets	444,333,865	369,726,597
Liabilities:
Financial Liabilities	729,471,438	837,915,964
Debt [member]
Liabilities:
Financial Liabilities	620,782,705	714,358,474
Financial instruments, class [member]
Liabilities:
Financial Liabilities	10,130,806	14,230,249
Equity investments at fair value through OCI and other short term investments [member]
Assets:
Financial Assets	117,703,202	50,096,051
Pension plan assets [member]
Assets:
Financial Assets	218,327,182	191,549,583
Derivative Financial Instruments [Member]
Assets:
Financial Assets	10,034,508	20,928,335
Liability Related to Right of Use of Assets [Member]
Liabilities:
Financial Liabilities	98,654,225	109,327,241
Revalued Of Assets [Member]
Assets:
Financial Assets	98,172,675	107,152,628
Debt Instruments At Fair Value Through OCI [Member]
Assets:
Equity investments at fair value through OCI and other short-term investments (Note 4)	6,894,757	4,540,344
Level 1 [member]
Assets:
Financial Assets	313,836,780	218,972,202
Current derivative financial assets	313,836,780	218,972,202
Liabilities:
Financial Liabilities	539,314,390	688,039,803
Level 1 [member] \| Debt [member]
Liabilities:
Financial Liabilities	440,660,165	578,712,562
Level 1 [member] \| Equity investments at fair value through OCI and other short term investments [member]
Assets:
Financial Assets	117,688,176	50,033,111
Level 1 [member] \| Pension plan assets [member]
Assets:
Financial Assets	196,148,604	168,939,091
Level 1 [member] \| Liability Related to Right of Use of Assets [Member]
Liabilities:
Financial Liabilities	98,654,225	109,327,241
Level 2 [member]
Assets:
Financial Assets	39,164,727	48,121,011
Current derivative financial assets	32,269,970	43,580,667
Liabilities:
Financial Liabilities	190,157,048	149,876,161
Level 2 [member] \| Debt [member]
Liabilities:
Financial Liabilities	180,122,540	135,645,912
Level 2 [member] \| Financial instruments, class [member]
Liabilities:
Financial Liabilities	10,130,806	14,230,249
Level 2 [member] \| Equity investments at fair value through OCI and other short term investments [member]
Assets:
Financial Assets	15,026	62,940
Level 2 [member] \| Pension plan assets [member]
Assets:
Financial Assets	22,124,138	22,589,392
Level 2 [member] \| Derivative Financial Instruments [Member]
Assets:
Financial Assets	10,034,508	20,928,335
Level 2 [member] \| Debt Instruments At Fair Value Through OCI [Member]
Assets:
Equity investments at fair value through OCI and other short-term investments (Note 4)	6,894,757
Level 3 [member]
Assets:
Financial Assets	98,227,115	107,173,728
Current derivative financial assets	98,227,115	107,173,728
Level 3 [member] \| Pension plan assets [member]
Assets:
Financial Assets	54,440	21,100
Level 3 [member] \| Revalued Of Assets [Member]
Assets:
Financial Assets	$ 98,172,675	$ 107,152,628

The amount of current derivative financial assets. [Refer: Derivative financial assets]

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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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