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Balances and Transactions in Foreign Currencies - Summary of Assets, Liabilities Foreign Currencies (Detail) - MXN ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of Balances and Transactions in Foreign Currencies [Line Items] |  |
Short-Term Assets | $ 69,843 | $ 18,047
Long-Term Assets | 1,822 | 2,277
Short-Term Liabilities | 6,462 | 5,131
Long-Term Liabilities | 96,689 | 111,575
U.S. dollars [member] |  |
Disclosure of Balances and Transactions in Foreign Currencies [Line Items] |  |
Short-Term Assets | 69,772 | 17,796
Long-Term Assets | 148 | 696
Short-Term Liabilities | 4,241 | 4,540
Long-Term Liabilities | 73,115 | 88,611
Euro [member] |  |
Disclosure of Balances and Transactions in Foreign Currencies [Line Items] |  |
Short-Term Assets | 25 | 246
Short-Term Liabilities | 1,881 | 345
Long-Term Liabilities | 23,573 | 21,774
Other currencies [member] |  |
Disclosure of Balances and Transactions in Foreign Currencies [Line Items] |  |
Short-Term Assets | 46 | 5
Long-Term Assets | 1,674 | 1,581
Short-Term Liabilities | 340 | 246
Long-Term Liabilities | $ 1 | $ 1,190

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