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Financial Instruments - Summary of Carrying Amounts and Fair Value of Financial Instruments (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Financial assets      
Derivative instruments $ 297   $ 794
Other investments and non-current accounts receivable 4,974   4,964
Other investments and non-current accounts receivable 5,271   5,758
Financial liabilities      
Long-term debt 182,074 $ 9,339 177,022
Other financial obligations 12,028   12,859
Derivative instruments 406   402
Total financial liabilities 194,508   190,283
At Fair Value [Member]      
Financial assets      
Derivative instruments 297   794
Other investments and non-current accounts receivable 4,974   4,964
Other investments and non-current accounts receivable 5,271   5,758
Financial liabilities      
Long-term debt 179,740   184,220
Other financial obligations 11,924   13,381
Derivative instruments 406   402
Total financial liabilities $ 192,070   $ 198,003