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Retained Earnings and Accumulated Other Comprehensive Income - Accumulated Other Comprehensive Income (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated at beginning | $ 1,320,451 |  |
Accumulated at ending | (15,556,848) | $ 1,320,451 |
Accumulated Other Comprehensive Income (loss) |  |  |
Accumulated at beginning | 1,320,451 | 4,427,487 |
Partial disposition of Open Ended Fund |  | (837,520) |
Remeasurement of post-employment benefit obligations of assets held for sale |  | 1,205 |
Changes in other comprehensive income | (16,877,299) | (2,268,311) |
Accumulated at ending | (15,556,848) | 1,320,451 | $ 4,427,487
Open Ended Fund |  |  |
Accumulated at beginning | 2,429,283 | 3,966,615 |
Partial disposition of Open Ended Fund |  | (1,186,130) |
Changes in other comprehensive income | (904,423) | (351,202) |
Accumulated at ending | 1,524,860 | 2,429,283 | 3,966,615
Other Financial Assets |  |  |
Accumulated at beginning |  | (111) |
Changes in other comprehensive income |  | 111 |
Accumulated at ending |  |  | (111)
Other Equity Instruments |  |  |
Accumulated at beginning | 991,902 | 1,786,526 |
Changes in other comprehensive income | (353,496) | (794,624) |
Accumulated at ending | 638,406 | 991,902 | 1,786,526
Warrants Exercisable for Common Stock of UHI |  |  |
Accumulated at beginning | (1,703,056) | (1,960,362) |
Changes in other comprehensive income | (21,899,164) | 257,306 |
Accumulated at ending | (23,602,220) | (1,703,056) | (1,960,362)
Exchange Differences on Translating Foreign Operations |  |  |
Accumulated at beginning | 734,676 | 814,307 |
Changes in other comprehensive income | 115,565 | (79,631) |
Accumulated at ending | 850,241 | 734,676 | 814,307
Remeasurement of Post-Employment Benefit Obligations |  |  |
Accumulated at beginning | (1,010,132) | (763,835) |
Remeasurement of post-employment benefit obligations of assets held for sale |  | 1,721 |
Changes in other comprehensive income | (340,319) | (244,576) |
Accumulated at ending | (1,350,451) | (1,010,132) | (763,835)
Derivative Financial Instruments Cash Flow Hedges |  |  |
Accumulated at beginning | (545,363) | 976,549 |
Changes in other comprehensive income | (1,370,145) | (1,521,912) |
Accumulated at ending | (1,915,508) | (545,363) | 976,549
Share of Income (Loss) of Associates and Joint Ventures |  |  |
Accumulated at beginning | (75,415) | 160,744 |
Changes in other comprehensive income | (61,033) | (236,159) |
Accumulated at ending | (136,448) | (75,415) | 160,744
Income Tax |  |  |
Accumulated at beginning | 498,556 | (552,946) |
Partial disposition of Open Ended Fund |  | 348,610 |
Remeasurement of post-employment benefit obligations of assets held for sale |  | (516) |
Changes in other comprehensive income | 7,935,716 | 702,376 |
Accumulated at ending | $ 8,434,272 | $ 498,556 | (552,946)
Adoption of IFRS 9 - New classification of Financial Instruments | Accumulated Other Comprehensive Income (loss) |  |  |
Cumulative adjustment for IFRS |  |  | $ 827,932

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