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Financial Instruments - Summary of Fair Value of Derivative Financial Instruments at Fair Value Hierarchy (Detail) - MXN ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Financial Assets and Financial Liabilities [line items]    
Derivative instruments $ 297 $ 794
Investments in strategic equity securities 217 275
Other investments at fair value through earnings 428 441
Total derivative financial assets 942 1,510
Liabilities measured at fair value Derivative instruments 406 402
Level 1 [Member]    
Disclosure Of Financial Assets and Financial Liabilities [line items]    
Derivative instruments 0 0
Investments in strategic equity securities 217 275
Other investments at fair value through earnings 0 0
Total derivative financial assets 217 275
Liabilities measured at fair value Derivative instruments 0 0
Level 2 [Member]    
Disclosure Of Financial Assets and Financial Liabilities [line items]    
Derivative instruments 297 794
Investments in strategic equity securities 0 0
Other investments at fair value through earnings 428 441
Total derivative financial assets 725 1,235
Liabilities measured at fair value Derivative instruments 406 402
Level 3 [Member]    
Disclosure Of Financial Assets and Financial Liabilities [line items]    
Derivative instruments 0 0
Investments in strategic equity securities 0 0
Other investments at fair value through earnings 0 0
Total derivative financial assets 0 0
Liabilities measured at fair value Derivative instruments $ 0 $ 0