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Financial Instruments - Summary of Outstanding Interest Rate Swap Agreements (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
Interest rate swap contract [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 $ 4,004,000,000 $ 4,013,000,000
Fair value liability (40,000,000) (49,000,000)
Fair Value Asset $ 0 $ 0
Interest rate swap contract [member] | Later than two years and not later than three years [member]    
Disclosure of detailed information about financial instruments [line items]    
Maturity Date 2020 2020
Notional Amount $ 4,548,000,000 $ 4,559,000,000
Fair value liability (189,000,000) (112,000,000)
Fair Value Asset $ 0 $ 0
Interest rate swap contract [member] | Later than three years and not later than four years [member]    
Disclosure of detailed information about financial instruments [line items]    
Maturity Date   2021
Notional Amount   $ 4,035,000,000
Fair value liability   (110,000,000)
Fair Value Asset   $ 0