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Financial Instruments - Summarizes Sugar Price and Aluminum Price Contracts (Detail) - MXN ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Fair Value Asset   $ 2,605,000,000
Cash flow hedges [member] | Sugar price contracts [member] | Later than one year and not later than two years [member]    
Disclosure of detailed information about financial instruments [line items]    
Maturity Date 2019 2019
Notional Amount $ 922,000,000 $ 1,223,000,000
Fair Value (Liability) (65,000,000) $ (88,000,000)
Fair Value Asset $ 4,000,000  
Cash flow hedges [member] | Sugar price contracts [member] | Not later than one year [member]    
Disclosure of detailed information about financial instruments [line items]    
Maturity Date 2020  
Notional Amount $ 1,018,000,000  
Fair Value (Liability) (21,000,000)  
Fair Value Asset $ 10,000,000  
Cash flow hedges [member] | Aluminum price contracts [member] | Later than one year and not later than two years [member]    
Disclosure of detailed information about financial instruments [line items]    
Maturity Date 2019 2019
Notional Amount $ 223,000,000 $ 265,000,000
Fair Value (Liability) $ (23,000,000) $ (17,000,000)
Cash flow hedges [member] | Aluminum price contracts [member] | Not later than one year [member]    
Disclosure of detailed information about financial instruments [line items]    
Maturity Date 2020  
Notional Amount $ 255,000,000  
Fair Value (Liability) $ (10,000,000)  
Cash flow hedges [member] | PX MEG price [member] | Later than one year and not later than two years [member]    
Disclosure of detailed information about financial instruments [line items]    
Maturity Date 2019 2019
Notional Amount $ 333,000,000 $ 1,303,000,000
Fair Value (Liability) $ (76,000,000) $ (131,000,000)
Cash flow hedges [member] | PX MEG price [member] | Not later than one year [member]    
Disclosure of detailed information about financial instruments [line items]    
Maturity Date 2020  
Notional Amount $ 333,000,000  
Fair Value (Liability) (9,000,000)  
Fair Value Asset $ 5,000,000