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Trade Accounts Receivable, Net - Disclosure of Changes in Allowance for Expected Credit Losses (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of financial assets [line items] |  |  |  |
Balance at the beginning of the period |  | $ 1,375 |  |
Balance at the end of the period |  | 2,114 | $ 1,375 |
Trade receivables [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Balance at the beginning of the period |  | 1,375 | 1,193 | $ 849
Effect of adoption of IFRS 9 |  | 468 |  |
Adjusted balance at the beginning of the period |  | 1,843 | 1,193 | 849
Allowance for the period |  | 348 | 530 | 467
Additions (write-offs) of uncollectible accounts | [1] | (402) | (400) | (418)
Addition from business combinations |  | 1 | 86 | 94
Effects of changes in foreign exchange rates |  | 324 | (32) | 201
Effect of Venezuela deconsolidation |  |  | (2) |
Balance at the end of the period |  | $ 2,114 | $ 1,375 | $ 1,193
[1] | In 2018, includes the effect of Coca-Cola FEMSA Philippines, Inc. sale for an aggregate amount of $ 82.

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in the allowance account used to record the impairment of financial assets due to credit losses. [Refer: Financial assets; Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in an allowance account for credit losses of financial assets resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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