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Balances and Transactions in Foreign Currencies - Summary of Assets, Liabilities Foreign Currencies (Detail) - MXN ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |
Short-Term Assets | $ 59,648 | $ 70,076
Long-Term Assets | 2,045 | 13,631
Short-Term Liabilities | 6,018 | 5,066
Long-Term Liabilities | 78,198 | 85,651
U.S. dollars [member] |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |
Short-Term Assets | 58,151 | 69,281
Long-Term Assets | 452 | 12,026
Short-Term Liabilities | 5,597 | 4,625
Long-Term Liabilities | 57,075 | 63,112
Euro [member] |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |
Short-Term Assets | 877 | 749
Short-Term Liabilities | 363 | 417
Long-Term Liabilities | 21,122 | 22,538
Other currencies [member] |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |
Short-Term Assets | 620 | 46
Long-Term Assets | 1,593 | 1,605
Short-Term Liabilities | 58 | 24
Long-Term Liabilities | $ 1 | $ 1

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