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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
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