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Income taxes (Schedule of Income Tax Expense (Benefit)) (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Major components of tax expense (income) [abstract] |  |  |  |
Expected benefit, expense |  | $ 514,294 | $ 1,308,828 | $ 890,249
Increase (decrease) as a result of: |  |  |  |
Inflation effect, net |  | (417,960) | (114,419) | (217,249)
Impact of the nominal rate differences between the USA and Mexico |  | (23,368) | (35,914) | (16,572)
Benefit from utilization of tax loss carry-forward and others | [1] | (987,135) | (1,238,444) | (115,068)
Others, net (includes permanent items) |  | 1,802,118 | 832,411 | 581,449
Income tax expense |  | $ 887,949 | $ 752,462 | $ 1,122,809
Effective tax rate |  | 54.26% | 17.92% | 37.21%
[1] | This amount corresponds to the income tax benefit obtained by those companies that used tax loss carry-forwards in the years presented that were generated previously 2019, 2018 and 2017 , less the effect of tax losses incurred by some subsidiaries for which no deferred tax asset was recorded.

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that the entity does not separately disclose in the same statement or note. [Refer: Accounting profit; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to changes in the tax rate. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Benefit from utilization of tax loss carry-forward and others. + References No definition available. + Details
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- Definition Amount of expected benefit, expense. + References No definition available. + Details
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- Definition The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)] + References No definition available. + Details
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