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Financial Instruments - Cross Currency Swaps (Details) - Cross-currency swaps - MXN ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Less than one year |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | $ 4,872 | $ 4,575
Fair value Liability |  | (5)
Fair Value Asset | 982 | 169
1-2 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 24,403 | 376
Fair Value Asset | 12,379 | 23
2-3 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 1,400 | 24,103
Fair Value Asset | 438 | 10,808
3-4 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 10,667 | 1,577
Fair value Liability | (1,564) | (9)
Fair Value Asset | 154 | 264
4-5 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 6,348 | 10,750
Fair value Liability | (1) | (2,481)
Fair Value Asset | 220 |
Sixth 12 months |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 7,204 |
Fair Value Asset | 366 |
Seventh 12 months |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 16,389 | 6,982
Fair value Liability | (21) | (464)
Fair Value Asset | 655 | 80
Later than seven years and not later than eight years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount |  | 1,519
Fair Value Asset |  | 122
8-9 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 3,911 |
Fair value Liability | (8) |
Fair Value Asset | 404 |
9-10 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount |  | 3,790
Fair value Liability |  | (107)
Fair Value Asset |  | 192
22-23 years |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | 8,869 | 8,869
Fair Value Asset | $ 1,553 | $ 2,706

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