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Income taxes (Schedule of Tax Losses Pending of Amortize) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Tax losses available | $ 10,631,235 |
2011 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2021 |
Tax losses available | $ 7,832,672 | [1]
2012 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2022 |
Tax losses available | $ 13 |
2013 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2023 |
Tax losses available | $ 4,944 |
2014 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2024 |
Tax losses available | $ 14,231 |
2015 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2025 |
Tax losses available | $ 8,395 |
2016 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2026 |
Tax losses available | $ 356,102 |
2017 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2027 |
Tax losses available | $ 348,058 |
2018 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2028 |
Tax losses available | $ 100,674 |
2018 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2029 |
Tax losses available | $ 1,119,822 |
2020 [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Expiration Date | 2030 |
Tax losses available | $ 846,324 |
[1] | This amount includes $ 7,832,647 corresponding to a tax loss from the sale of shares which, according to the Income Tax Law, can only be applied against taxable profits on the sale of shares generated in the future

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