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Financial Instruments - Summary of Derivative Financial Instruments (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
MXN ($)
Disclosure of detailed information about financial instruments [line items]        
Derivative financial instrument, Notional amount $ 1,918   $ 880  
Derivative financial instrument, Fair value 73   64  
Net Investment Hedges [Member]        
Disclosure of detailed information about financial instruments [line items]        
Derivative financial instrument, Notional amount 1,160   0  
Derivative financial instrument, Fair value 47   0  
Foreign exchange forwards related to forecasted transactions [member]        
Disclosure of detailed information about financial instruments [line items]        
Derivative financial instrument, Notional amount 381   80  
Derivative financial instrument, Fair value 3   0  
Equity forwards on third party shares [Member]        
Disclosure of detailed information about financial instruments [line items]        
Derivative financial instrument, Notional amount 168   0  
Derivative financial instrument, Fair value 7   0  
Interest Rate Swap Contract [Member]        
Disclosure of detailed information about financial instruments [line items]        
Derivative financial instrument, Notional amount 137   147  
Derivative financial instrument, Fair value 16 $ 314 23 $ 477
Fuels Price Hedging [Member]        
Disclosure of detailed information about financial instruments [line items]        
Derivative financial instrument, Notional amount 72   77  
Derivative financial instrument, Fair value 20   15  
2019 Mandatorily Convertible Securities and options on the Parent Company's own shares [member]        
Disclosure of detailed information about financial instruments [line items]        
Derivative financial instrument, Notional amount 0   576  
Derivative financial instrument, Fair value $ (20)   $ 26