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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

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