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Taxes - Deferred tax related to OCI (Details) - MXN ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | $ (16,010) | $ (13,575) | $ (10,657) | $ (9,720)
Other comprehensive income [member] |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | 33 | (596) |  |
Other comprehensive income [member] | Remeasurements of the net defined benefit liability [member] |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | (762) | (560) |  |
Other comprehensive income [member] | Valuation of the effective portion of derivative financial instrument [member] |  |  |  |
Disclosure of income taxes [Line Items] |  |  |  |
Deferred tax (liability)/asset, net | $ 795 | $ (36) |  |

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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 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 + Details
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