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Financial Instruments - Interest Rate Swaps (Detail) - Interest rate swaps [member] - MXN ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
0-1 year [member]    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount $ 449 $ 4,365
Fair value Liability (6) (142)
Second 12 months    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount 458 405
Fair value Liability (16) (24)
Third 12 months    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount 12,918 414
Fair value Liability (492) (20)
Fourth 12 months    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount 2,294 12,770
Fair value Liability $ (126) (79)
Fair Value Asset   245
Fifth 12 months    
Disclosure of Financial Assets and Financial Liabilities [Line Items]    
Notional amount   $ 3