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Equity Accounted Investees, Other Investments and Non-Current Accounts Receivable - Summary of Combined Selected Information of the Statements of Operations (Detail) - MXN ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of associates [line items]      
Sales $ 258,131 $ 249,945 $ 219,299
Operating earnings 28,756 33,873 23,844
Income before income tax 13,659 17,563 3,464
Net income 16,638 15,206 2,124
Associates [member]      
Disclosure of associates [line items]      
Sales 28,158 29,791 25,484
Operating earnings 4,458 4,730 3,523
Income before income tax 2,451 3,111 3,350
Net income $ 1,891 $ 1,860 $ 2,403