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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 | 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

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