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Balances and Transactions with Related Parties and Affiliated Companies - Summary of Benefits and Aggregate Compensation Paid to Executive Officers and Senior Management of the Company, Recognized as an Expense During the Reporting Period (Detail) - MXN ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of transactions between related parties [abstract]      
Current employee benefits $ 621 $ 652 $ 552
Termination benefits 27 154 32
Shared based payments $ 316 $ 258 $ 138