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Taxes - Deferred Tax Related to OCI (Details) - MXN ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | $ 18,219 | $ 20,227 | $ 20,067 | $ 14,691
Accumulated other comprehensive income |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | 1,839 | 3,332 |  |
Accumulated other comprehensive income | Valuation of the effective portion of derivative financial instrument |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | 1,125 | 324 |  |
Accumulated other comprehensive income | Remeasurements of the net defined benefit liability |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | (620) | (221) |  |
Accumulated other comprehensive income | Exchange differences on translation of foreign operations |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | (67) | 1,828 |  |
Accumulated other comprehensive income | Gain on hedge of net investments in foreign operations |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | $ 1,401 | $ 1,401 |  |

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