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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
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