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Balances and Transactions in Foreign Currencies - Balances (Detail) - MXN ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |
Short-Term Assets | $ 70,137 | $ 59,648
Long-Term Assets | 2,492 | 2,045
Short-Term Liabilities | 6,069 | 6,018
Long-Term Liabilities | 146,521 | 78,198
USD |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |
Short-Term Assets | 69,612 | 58,151
Long-Term Assets | 1,143 | 452
Short-Term Liabilities | 5,590 | 5,597
Long-Term Liabilities | 122,000 | 57,075
Euro [member] |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |
Short-Term Assets | 479 | 877
Short-Term Liabilities | 458 | 363
Long-Term Liabilities | 24,521 | 21,122
Other currencies [member] |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |
Short-Term Assets | 46 | 620
Long-Term Assets | 1,349 | 1,593
Short-Term Liabilities | $ 21 | 58
Long-Term Liabilities |  | $ 1

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