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Financial Instruments - Summary of Fair Value of Derivative Financial Instruments at Fair Value Hierarchy (Detail) - MXN ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Financial Assets and Financial Liabilities [line items]    
Derivative instruments $ 794 $ 1,900
Investments available-for-sale 275 491
Investments held for trading 77 157
Total derivative financial assets 1,146 2,548
Liabilities measured at fair value Derivative instruments 402 818
Level 1 [Member]    
Disclosure Of Financial Assets and Financial Liabilities [line items]    
Derivative instruments 0 0
Investments available-for-sale 275 491
Investments held for trading 0 0
Total derivative financial assets 275 491
Liabilities measured at fair value Derivative instruments 0 0
Level 2 [Member]    
Disclosure Of Financial Assets and Financial Liabilities [line items]    
Derivative instruments 794 1,900
Investments available-for-sale 0 0
Investments held for trading 77 157
Total derivative financial assets 871 2,057
Liabilities measured at fair value Derivative instruments 402 818
Level 3 [Member]    
Disclosure Of Financial Assets and Financial Liabilities [line items]    
Derivative instruments 0 0
Investments available-for-sale 0 0
Investments held for trading 0 0
Total derivative financial assets 0 0
Liabilities measured at fair value Derivative instruments $ 0 $ 0