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Income taxes (Schedule of Income Tax Charged (Credited)) (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Income taxes | $ 2,077,844 | $ 3,276,274 | $ 752,462
Mexican companies [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Income tax | 1,460,057 | 3,177,506 | 67,745
Deferred Tax | (94,604) | 12,978 | 408,141
Foreign companies [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Income tax | 370,860 | 301,263 | 444,104
Deferred Tax | $ 341,531 | $ (215,473) | $ (167,528)

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2020-01-01 + Details
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