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Revenue and Construction Contracts - Summary of Changes in the Balance of Contract Liabilities with Customers (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Contract liabilities [abstract]      
Opening balance of contract liabilities with customers $ 770 $ 645 $ 660
Increase during the period for new transactions 1,070 1,156 1,040
Decrease during the period for exercise or expiration of incentives (890) (1,148) (1,038)
Currency translation effects (175) 117 (17)
Closing balance of contract liabilities with customers $ 775 $ 770 $ 645