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Investments in Other Entities - Summary of Investments in Other Entities (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Disclosure of investments in associates and other [line items]      
Investments in other entities $ 12,540 $ 639 $ 22,357
Investments accounted for using equity method [member]      
Disclosure of investments in associates and other [line items]      
Investments in other entities 12,540   22,357
Investments accounted for using equity method [member] | Investment in Associates and Joint Ventures [member]      
Disclosure of investments in associates and other [line items]      
Investments in other entities 11,501   $ 22,357
Investments accounted for using equity method [member] | Investment in Venezuela subsidiary [member]      
Disclosure of investments in associates and other [line items]      
Investments in other entities $ 1,039