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Financial Instruments - Summary of Net Effects of Expired Contracts Met Hedging Criteria (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure of net effects of expired contracts that met hedging criteria [Line Items]        
Interest expense $ 8,809 $ 449 $ 7,471 $ 6,337
Cost of goods sold 112,094 $ 5,708 98,056 80,330
Derivatives designated as hedges [member] | Currency swap contract [member]        
Disclosure of net effects of expired contracts that met hedging criteria [Line Items]        
Interest expense 2,102     2,595
Foreign exchange       (10,911)
Derivatives designated as hedges [member] | Options to purchase foreign currency [member]        
Disclosure of net effects of expired contracts that met hedging criteria [Line Items]        
Cost of goods sold       (21)
Derivatives designated as hedges [member] | Forward agreements to purchase foreign currency [member]        
Disclosure of net effects of expired contracts that met hedging criteria [Line Items]        
Cost of goods sold 89   (45) (523)
Derivatives designated as hedges [member] | Commodity price contracts [member]        
Disclosure of net effects of expired contracts that met hedging criteria [Line Items]        
Cost of goods sold $ (6)   $ (241) $ 619