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Income Taxes - Temporary differences and tax loss carryforwards to arrive deferred income taxes (Details) - MXN ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Income Taxes |  |  |
Deferred income tax assets, net | $ 26,213,382 | $ 17,132,915 | $ 13,791,257
Accrued liabilities |  |  |
Income Taxes |  |  |
Deferred tax assets | 6,219,312 | 4,352,021 |
Deferred income tax assets, net | 6,219,312 | 4,352,021 | 3,619,288
Loss allowance |  |  |
Income Taxes |  |  |
Deferred tax assets | 1,235,658 | 1,550,482 |
Deferred income tax assets, net | 1,235,658 | 1,550,482 | 1,344,425
Customer advances |  |  |
Income Taxes |  |  |
Deferred tax assets | 1,600,334 | 1,499,462 |
Deferred income tax assets, net | 1,600,334 | 1,499,462 | 1,799,330
Derivative financial instruments |  |  |
Income Taxes |  |  |
Deferred income tax assets, net | 972,991 | 273,210 |
Property, plant and equipment, net |  |  |
Income Taxes |  |  |
Deferred tax assets | 2,084,550 | 1,650,860 |
Deferred income tax assets, net | 2,084,550 | 1,650,860 | 1,570,890
Prepaid expenses and other items |  |  |
Income Taxes |  |  |
Deferred tax assets | 5,868,717 | 3,700,673 |
Deferred income tax assets, net | 5,868,717 | 3,700,673 | 1,125,387
Operating tax losses |  |  |
Income Taxes |  |  |
Deferred tax assets | 5,481,738 | 7,433,425 |
Capital tax losses |  |  |
Income Taxes |  |  |
Deferred tax assets | 5,767,847 | 5,591,581 |
Investments |  |  |
Income Taxes |  |  |
Deferred tax liabilities | (729,910) | (6,676,401) |
Deferred income tax assets, net | (729,910) | (6,676,401) | (7,812,896)
Derivative financial instruments |  |  |
Income Taxes |  |  |
Deferred income tax assets, net |  |  | (248,547)
Intangible assets and transmission rights |  |  |
Income Taxes |  |  |
Deferred tax liabilities | (2,549,784) | (2,406,145) |
Deferred income tax assets, net | (2,549,784) | (2,406,145) | (843,409)
Deferred income tax assets of Mexican companies |  |  |
Income Taxes |  |  |
Deferred income tax assets, net | 25,951,453 | 16,969,168 |
Deferred income tax assets of foreign subsidiaries |  |  |
Income Taxes |  |  |
Deferred income tax assets, net | $ 261,929 | $ 163,747 | $ 221,392

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