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Post-employment Benefits - Fair value plan assets (Details) - MXN ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Plan assets measured at fair value |  |  |
Post-employment benefit liability (asset) | $ 2,080,651 | $ 1,468,112 | $ 962,497
Plan assets |  |  |
Plan assets measured at fair value |  |  |
Post-employment benefit liability (asset) | (1,195,749) | (1,379,496) | $ (1,515,030)
Plan assets | Recurring basis |  |  |
Plan assets measured at fair value |  |  |
Mutual funds (fixed rate instruments) | 231,837 | 218,269 |
Money market securities | 607,658 | 766,181 |
Post-employment benefit liability (asset) | 1,195,749 | 1,379,496 |
Plan assets | Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Plan assets measured at fair value |  |  |
Mutual funds (fixed rate instruments) | 231,837 | 218,269 |
Money market securities | 607,658 | 766,181 |
Post-employment benefit liability (asset) | 1,195,749 | 1,379,496 |
Plan assets | Recurring basis | Trading equity securities - Common stock |  |  |
Plan assets measured at fair value |  |  |
Equity instruments | 101,690 | 136,963 |
Plan assets | Recurring basis | Trading equity securities - Common stock | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Plan assets measured at fair value |  |  |
Equity instruments | 101,690 | 136,963 |
Plan assets | Recurring basis | Other equity securities |  |  |
Plan assets measured at fair value |  |  |
Equity instruments | 254,564 | 258,083 |
Plan assets | Recurring basis | Other equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Plan assets measured at fair value |  |  |
Equity instruments | $ 254,564 | $ 258,083 |

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- Definition The amount cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 142 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_142_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 142 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_142_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_140_a&doctype=Standard -URIDate 2020-01-01 + Details
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