Financial Assets and Liabilities - Summary of Fair Value for Financial Assets (Excluding Cash and Cash Equivalents) and Financial Liabilities (Detail) - MXN ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets:
Financial Assets	$ 324,827,314	$ 344,892,278
Current derivative financial assets	310,316,772	337,911,129
Liabilities:
Financial Liabilities	633,179,177	648,038,187
Debt [member]
Liabilities:
Financial Liabilities	477,212,053	488,558,030
Financial instruments, class [member]
Assets:
Financial Assets	1,779,953	2,602,680
Equity investments at fair value through OCI and other short term investments [member]
Assets:
Financial Assets	74,517,951	88,428,111
Pension plan assets [member]
Assets:
Financial Assets	206,205,923	208,526,619
Derivative Financial Instruments [Member]
Liabilities:
Financial Liabilities	24,499,284	25,331,346
Liability Related to Right of Use of Assets [Member]
Liabilities:
Financial Liabilities	131,467,840	134,148,811
Revalued Of Assets [Member]
Assets:
Financial Assets	27,812,945	38,353,719
Debt Instruments At Fair Value Through OCI [Member]
Assets:
Equity investments at fair value through OCI and other short-term investments	14,510,542	6,981,149
Level 1 [member]
Assets:
Financial Assets	265,532,404	281,257,799
Current derivative financial assets	260,499,807	281,257,799
Liabilities:
Financial Liabilities	481,122,722	505,858,206
Level 1 [member] \| Debt [member]
Liabilities:
Financial Liabilities	349,654,882	371,709,395
Level 1 [member] \| Equity investments at fair value through OCI and other short term investments [member]
Assets:
Financial Assets	68,627,966	88,428,111
Level 1 [member] \| Pension plan assets [member]
Assets:
Financial Assets	191,871,841	192,829,688
Level 1 [member] \| Liability Related to Right of Use of Assets [Member]
Liabilities:
Financial Liabilities	131,467,840	134,148,811
Level 1 [member] \| Debt Instruments At Fair Value Through OCI [Member]
Assets:
Equity investments at fair value through OCI and other short-term investments	5,032,597
Level 2 [member]
Assets:
Financial Assets	25,556,120	25,241,490
Current derivative financial assets	16,078,175	18,260,341
Liabilities:
Financial Liabilities	152,056,455	142,179,981
Level 2 [member] \| Debt [member]
Liabilities:
Financial Liabilities	127,557,171	116,848,635
Level 2 [member] \| Financial instruments, class [member]
Assets:
Financial Assets	1,779,953	2,602,680
Level 2 [member] \| Pension plan assets [member]
Assets:
Financial Assets	14,298,222	15,657,661
Level 2 [member] \| Derivative Financial Instruments [Member]
Liabilities:
Financial Liabilities	24,499,284	25,331,346
Level 2 [member] \| Debt Instruments At Fair Value Through OCI [Member]
Assets:
Equity investments at fair value through OCI and other short-term investments	9,477,945	6,981,149
Level 3 [member]
Assets:
Financial Assets	33,738,790	38,392,989
Current derivative financial assets	33,738,790	38,392,989
Level 3 [member] \| Equity investments at fair value through OCI and other short term investments [member]
Assets:
Financial Assets	5,889,985
Level 3 [member] \| Pension plan assets [member]
Assets:
Financial Assets	35,860	39,270
Level 3 [member] \| Revalued Of Assets [Member]
Assets:
Financial Assets	$ 27,812,945	$ 38,353,719

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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The amount of non-current financial assets. [Refer: Financial assets]

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