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Financial Instruments - Interest Rate Swaps (Details) - Interest rate swap - MXN ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Less than one year |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount | $ 131 | $ 449
Fair value Liability | (1) | (6)
1-2 years |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount | 12,129 | 458
Fair value Liability |  | (16)
Fair Value Asset | 177 |
2-3 years |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount | 2,367 | 12,918
Fair value Liability | (39) | (492)
3-4 years |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount |  | 2,294
Fair value Liability |  | $ (126)
Later than 5 years |  |
Disclosure of Financial Assets and Financial Liabilities [Line Items] |  |
Notional amount | 6,175 |
Fair Value Asset | $ 170 |

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