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Financial Instruments - Summary of Carrying Amounts and Fair Value of Financial Instruments (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
MXN ($)
Financial assets        
Derivative instruments   $ 794   $ 1,900
Other investments and non-current accounts receivable   4,964   5,220
Other investments and non-current accounts receivable   5,758   7,120
Financial liabilities        
Long-term debt $ 9,892 177,022 $ 11,379 235,016
Other financial obligations   12,859   25,972
Derivative instruments   402   818
Total financial liabilities   190,283   261,806
At Fair Value [Member]        
Financial assets        
Derivative instruments   794   1,900
Other investments and non-current accounts receivable   4,964   5,220
Other investments and non-current accounts receivable   5,758   7,120
Financial liabilities        
Long-term debt   184,220   241,968
Other financial obligations   13,381   27,419
Derivative instruments   402   818
Total financial liabilities   $ 198,003   $ 270,205