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Financial Instruments - Significant Unobservable Inputs (Details) - Internal Models with Significant Unobservable Inputs (Level 3) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Reconciliation for all assets and liabilities measured at fair value |  |
Balance at beginning of year | $ 34,921,530 | $ 36,395,183
Included in other comprehensive income | (1,146,079) | (1,473,653)
Balance at the end of year | $ 33,775,451 | $ 34,921,530

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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The gains (losses) on exchange differences, recognised in other comprehensive income, on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 13 -IssueDate 2019-01-01 -Paragraph 93 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_e_ii&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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