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Income Taxes - Expiration of tax loss carryforwards (Details) - MXN ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Income Taxes |  |  |
Tax loss carryforwards for which deferred taxes were recognized | $ 28,329,882 |  |
Benefit from tax loss carryforwards derived from the disposal in 2014 of its investment in GSF | 15,086,807 |  |
Tax loss carryforwards derived from disposal of GSF for which deferred taxes were recognized | 15,086,807 |  |
2020 |  |  |
Income Taxes |  |  |
Tax loss carryforwards for which deferred taxes were recognized | 91,050 |  |
2021 |  |  |
Income Taxes |  |  |
Tax loss carryforwards for which deferred taxes were recognized | 174,278 |  |
2022 |  |  |
Income Taxes |  |  |
Tax loss carryforwards for which deferred taxes were recognized | 2,051,839 |  |
2023 |  |  |
Income Taxes |  |  |
Tax loss carryforwards for which deferred taxes were recognized | 233,434 |  |
2024 |  |  |
Income Taxes |  |  |
Tax loss carryforwards for which deferred taxes were recognized | 972,878 |  |
Thereafter |  |  |
Income Taxes |  |  |
Tax loss carryforwards for which deferred taxes were recognized | 24,806,403 |  |
Expires between 2019 and 2028 |  |  |
Income Taxes |  |  |
Unused tax loss carryforwards for which no deferred taxes were recognized | 1,780,793 |  |
Expires between 2019 and 2037 |  |  |
Income Taxes |  |  |
Tax loss carryforwards of subsidiaries in South America, the United States, and Europe | 2,496,982 |  |
Certain Mexican subsidiaries |  |  |
Income Taxes |  |  |
Utilized tax loss carryforwards | $ 6,457,550 | $ 14,072,331 | $ 5,806,602

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