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Trade Notes and Accounts Receivable, Net (Details) - MXN ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Trade Notes and Accounts Receivable, Net |  |  |
Non-interest bearing notes received from customers as deposits and advances mainly in connection with annual ("upfront basis") and from time to time ("scatter basis") prepayments | $ 3,327,579 | $ 4,188,293 |
Trade accounts receivable | 13,265,351 | 15,144,534 |
Loss allowance | (4,249,133) | (4,846,643) | $ (4,379,316)
Total trade notes and accounts receivable, net | $ 12,343,797 | $ 14,486,184 |

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- Definition The amount of current trade receivables and current other receivables. [Refer: Current trade receivables; Other current receivables] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_h&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition For an unclassified balance sheet, a valuation allowance for receivables of trade and accounts receivable. + References No definition available. + Details
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