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Commitments - Summary of Contractual Obligations (Parenthetical) (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Disclosure of Detailed Information About Borrowings [Line Items]              
Future minimum lease payments $ 2,396           $ 122
Rental expense $ 3,493 $ 185 $ 2,252 $ 115 $ 2,507 $ 121  
Estimated annual benefit payment period Next 10 years Next 10 years Next 10 years Next 10 years      
1-3 years [Member]              
Disclosure of Detailed Information About Borrowings [Line Items]              
Future minimum lease payments $ 1,450           74
3-5 Years [Member]              
Disclosure of Detailed Information About Borrowings [Line Items]              
Future minimum lease payments $ 276           $ 14