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Revenue and Construction Contracts - Summary of Revenues and Costs Related to Construction Contracts in Progress (Detail) - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Analysis of income and expense [abstract]      
Revenue from construction contracts included in consolidated revenues, accumulated $ 1,063    
Costs incurred in construction contracts included in consolidated cost of sales, accumulated (1,055)    
Construction contracts gross operating profit (loss), accumulated 8    
Revenue from construction contracts included in consolidated revenues 1,383 $ 992 $ 1,033
Costs incurred in construction contracts included in consolidated cost of sales (1,312) (1,205) (1,133)
Construction contracts gross operating profit (loss) $ 71 $ (213) $ (100)