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Inventories - Summary of Changes in Inventories (Detail) - MXN ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Classes of current inventories [abstract]      
Changes in inventories of finished goods and work in progress $ 196,547 $ 172,554 $ 132,835
Raw materials and consumables used 85,568 63,285 53,514
Total $ 282,115 $ 235,839 $ 186,349