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Income Taxes - Expiration of tax loss carryforwards (Details) - MXN ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Income Taxes |  |  |
Tax loss carryforwards for which deferred taxes were recognized | $ 21,936,225 |  |
Benefit from tax loss carryforwards derived from the disposal in 2014 of its investment in GSF | 4,668,717 | $ 4,526,042 |
Tax loss carryforwards derived from disposal of GSF for which deferred taxes were recognized |  | 15,562,391 |
2021 |  |  |
Income Taxes |  |  |
Tax loss carryforwards for which deferred taxes were recognized | 157,193 |  |
2022 |  |  |
Income Taxes |  |  |
Tax loss carryforwards for which deferred taxes were recognized | 396,066 |  |
2023 |  |  |
Income Taxes |  |  |
Tax loss carryforwards for which deferred taxes were recognized | 117,080 |  |
2024 |  |  |
Income Taxes |  |  |
Tax loss carryforwards for which deferred taxes were recognized | 230,772 |  |
2025 |  |  |
Income Taxes |  |  |
Tax loss carryforwards for which deferred taxes were recognized | 8,706,619 |  |
Thereafter |  |  |
Income Taxes |  |  |
Tax loss carryforwards for which deferred taxes were recognized | 12,328,495 |  |
Expires between 2021 and 2028 |  |  |
Income Taxes |  |  |
Unused tax loss carryforwards for which no deferred taxes were recognized | 3,644,289 |  |
Expires between 2021 and 2037 |  |  |
Income Taxes |  |  |
Tax loss carryforwards of subsidiaries in South America, the United States, and Europe | 3,034,191 |  |
Certain Mexican subsidiaries |  |  |
Income Taxes |  |  |
Utilized tax loss carryforwards | 6,160,740 | $ 6,457,550 | $ 14,072,331
Benefit from tax loss carryforwards derived from the disposal in 2014 of its investment in GSF | $ 15,562,391 |  |

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