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Financial Instruments - Disclosure of Net Effects of Expired Contracts Met Hedging Criteria (Detail) - Derivative contracts that met hedging criteria [Member] - MXN ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cross-currency swaps [member] | Interest expense [member]      
Disclosure of detailed information about hedges [line items]      
Net effects derivative contracts hedging criteria $ 157 $ 2,102  
Cross-currency swaps [member] | Foreign exchange [Member]      
Disclosure of detailed information about hedges [line items]      
Net effects derivative contracts hedging criteria 642    
Forward agreements to purchase foreign currency [member] | Foreign exchange [Member]      
Disclosure of detailed information about hedges [line items]      
Net effects derivative contracts hedging criteria (87) (40) $ 160
Forward agreements to purchase foreign currency [member] | Cost of sales [member]      
Disclosure of detailed information about hedges [line items]      
Net effects derivative contracts hedging criteria 240 89 (45)
Commodity price contracts [Member] | Cost of sales [member]      
Disclosure of detailed information about hedges [line items]      
Net effects derivative contracts hedging criteria (258) $ (6) $ (241)
Options to purchase foreign currency [Member] | Cost of sales [member]      
Disclosure of detailed information about hedges [line items]      
Net effects derivative contracts hedging criteria $ (8)