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Income Taxes - Rollforward of deferred income tax assets and liabilities (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | $ 17,132,915 | $ 13,791,257
Credit (Charge) to Consolidated Statement of Income | 1,574,610 | 2,598,712
Credit (Charge) to Other Comprehensive Income and Equity | 7,528,693 | 811,677
Disposed Operations | (22,836) | (68,731)
Reclassification to current assets (liabilities) held for sale |  | (68,731)
Deferred income tax account at end of period | 26,213,382 | 17,132,915
Assets |  |
Rollforward of deferred income tax assets and liabilities |  |
Credit (Charge) to Consolidated Statement of Income | 0 |
Accrued liabilities |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | 4,352,021 | 3,619,288
Credit (Charge) to Consolidated Statement of Income | 1,867,291 | 732,733
Deferred income tax account at end of period | 6,219,312 | 4,352,021
Loss allowance |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | 1,550,482 | 1,344,425
Credit (Charge) to Consolidated Statement of Income | (314,824) | 206,057
Deferred income tax account at end of period | 1,235,658 | 1,550,482
Customer advances |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | 1,499,462 | 1,799,330
Credit (Charge) to Consolidated Statement of Income | 100,872 | (299,868)
Deferred income tax account at end of period | 1,600,334 | 1,499,462
Derivative financial instruments |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | 273,210 |
Credit (Charge) to Consolidated Statement of Income | 288,737 | (183,364)
Credit (Charge) to Other Comprehensive Income and Equity | 411,044 | 456,574
Deferred income tax account at end of period | 972,991 | 273,210
Property, plant and equipment, net |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | 1,650,860 | 1,570,890
Credit (Charge) to Consolidated Statement of Income | 433,690 | 79,970
Deferred income tax account at end of period | 2,084,550 | 1,650,860
Prepaid expenses and other items |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | 3,700,673 | 1,125,387
Credit (Charge) to Consolidated Statement of Income | 2,087,586 | 2,586,763
Credit (Charge) to Other Comprehensive Income and Equity | 103,294 | 57,254
Disposed Operations | (22,836) |
Reclassification to current assets (liabilities) held for sale |  | (68,731)
Deferred income tax account at end of period | 5,868,717 | 3,700,673
Tax loss carryforwards |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | 13,025,006 | 13,015,397
Credit (Charge) to Consolidated Statement of Income | (1,516,219) | 334,122
Credit (Charge) to Other Comprehensive Income and Equity | (259,202) | (324,513)
Deferred income tax account at end of period | 11,249,585 | 13,025,006
Deferred income tax assets of foreign subsidiaries |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | 163,747 | 221,392
Credit (Charge) to Consolidated Statement of Income | 98,182 | (57,645)
Deferred income tax account at end of period | 261,929 | 163,747
Investments |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | (6,676,401) | (7,812,896)
Credit (Charge) to Consolidated Statement of Income | (1,327,066) | 514,133
Credit (Charge) to Other Comprehensive Income and Equity | 7,273,557 | 622,362
Deferred income tax account at end of period | (729,910) | (6,676,401)
Derivative financial instruments |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period |  | (248,547)
Credit (Charge) to Consolidated Statement of Income | 0 | 248,547
Intangible assets and transmission rights |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | (2,406,145) | (843,409)
Credit (Charge) to Consolidated Statement of Income | (143,639) | (1,562,736)
Deferred income tax account at end of period | $ (2,549,784) | $ (2,406,145)

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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 + Details
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