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Balances and Transactions in Foreign Currencies - Summary of Assets, Liabilities Foreign Currencies (Detail) - MXN ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |
Short-Term Assets | $ 70,076 | $ 69,843
Long-Term Assets | 13,631 | 1,822
Short-Term Liabilities | 5,066 | 6,462
Long-Term Liabilities | 85,651 | 96,689
U.S. dollars [member] |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |
Short-Term Assets | 69,281 | 69,772
Long-Term Assets | 12,026 | 148
Short-Term Liabilities | 4,625 | 4,241
Long-Term Liabilities | 63,112 | 73,115
Euro [member] |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |
Short-Term Assets | 749 | 25
Short-Term Liabilities | 417 | 1,881
Long-Term Liabilities | 22,538 | 23,573
Other currencies [member] |  |
Disclosure of Balances and Transactions in Foreign Currencies [line items] |  |
Short-Term Assets | 46 | 46
Long-Term Assets | 1,605 | 1,674
Short-Term Liabilities | 24 | 340
Long-Term Liabilities | $ 1 | $ 1

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