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Information by Segment - Summary of Geographic Disclosure (Detail) - MXN ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of geographical areas [line items]    
Total Non Current Assets $ 398,774 $ 407,353
Mexico and Central America [member]    
Disclosure of geographical areas [line items]    
Total Non Current Assets 195,310 176,174
Asia [Member]    
Disclosure of geographical areas [line items]    
Total Non Current Assets   17,233
South America [member]    
Disclosure of geographical areas [line items]    
Total Non Current Assets 120,003 130,226
Europe [member]    
Disclosure of geographical areas [line items]    
Total Non Current Assets $ 83,461 $ 83,720