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Taxes - Deferred tax related to OCI (Details) - MXN ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | $ (14,691) | $ (16,010) | $ (13,575) | $ (10,657)
Other comprehensive income |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | 4,623 | 3,571 |  |
Other comprehensive income | Portion of derivative financial instrument |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | 1,796 | 795 |  |
Other comprehensive income | Remeasurements of the net defined benefit liability |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | (637) | (762) |  |
Other comprehensive income | Exchange differences on translation of foreign operations |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | 7,520 | 9,250 |  |
Other comprehensive income | Gain on hedge of net investments in foreign operations |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | 181 | 31 |  |
Other comprehensive income | Share of other comprehensive income of associated companies and joint ventures |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | $ (4,237) | $ (5,743) |  |

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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2021-03-24 + Details
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