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Goodwill and Intangible Assets, Net - Summary of Changes in Consolidated goodwill (Detail) - MXN ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of changes in goodwill [abstract]      
Balance at beginning of period $ 195,474 $ 206,319 $ 184,156
Business combinations 309 1,965 0
Disposals, net (note 4.3) 0 0 (3,340)
Reclassification to assets held for sale and other current assets (notes 4.2, 4.3 and 12) (439) (1,804) (9,734)
Impairment losses 0 (1,920) 0
Foreign currency translation effects (565) (9,086) 35,237
Balance at end of period $ 194,779 $ 195,474 $ 206,319