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Financial Instruments - Disclosure of Outstanding Interest Rate Swap Agreements (Detail) - Interest rate swap [member] - MXN ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
0-1 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional Amount $ 3,908 $ 4,032
Fair value Liability (31) (49)
1-2 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional Amount 4,440 4,559
Fair value Liability (151) (112)
2-3 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional Amount 4,411 4,548
Fair value Liability (236) (151)
3-4 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional Amount 538 617
Fair value Liability (22) (18)
4-5 years [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional Amount 13,095 13,101
Fair value Liability (79) (49)
Fair Value Asset $ 546 $ 1,143