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Balances and Transactions in Foreign Currencies - Summary of Balances and Transactions in Foreign Currencies (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Disclosure of Balances and Transactions in Foreign Currencies [Line Items]      
Current assets $ 55,657 $ 2,834 $ 45,453
Noncurrent assets 230,020 11,712 233,803
Current liabilities 55,594 2,831 39,868
Noncurrent liabilities 89,373 $ 4,550 110,155
U.S. dollars [member]      
Disclosure of Balances and Transactions in Foreign Currencies [Line Items]      
Current assets 5,852   2,097
Noncurrent assets     686
Current liabilities 2,783   3,544
Noncurrent liabilities 53,093   66,995
Euros [member]      
Disclosure of Balances and Transactions in Foreign Currencies [Line Items]      
Current liabilities $ 1,547   $ 19