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Trade Accounts Receivable, Net - Summary of Trade Accounts Receivable (Detail) - MXN ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Trade and other receivables [abstract]        
Trade accounts receivable $ 32,623 $ 32,356    
Allowances for doubtful accounts (2,145) (2,196) $ (2,152) $ (1,856)
Trade receivables $ 30,478 $ 30,160