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Trade Accounts Receivable, Net (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Trade Accounts Receivable | As of December 31, 2017 and 2016, consolidated trade accounts receivable consisted of:
|  |  |  |  | 2017 |  |  | 2016 |
Trade accounts receivable |  |  | Ps |  |  |  | 32,623 |  |  |  | 32,356 |
Allowances for doubtful accounts |  |  |  |  |  |  | (2,145 | ) |  |  | (2,196 | )
|  |  | Ps |  |  |  | 30,478 |  |  |  | 30,160 |
Summary of Changes in Valuation of Caption Allowance for Doubtful Accounts | Changes in the valuation of this caption allowance for doubtful accounts in 2017, 2016 and 2015, were as follows:
|  |  |  |  | 2017 |  |  | 2016 |  |  | 2015 |
Allowances for doubtful accounts at beginning of period |  |  | Ps |  |  |  | 2,196 |  |  |  | 2,152 |  |  |  | 1,856 |
Charged to selling expenses |  |  |  |  |  |  | 252 |  |  |  | 556 |  |  |  | 434 |
Additions through business combinations |  |  |  |  |  |  | 141 |  |  |  | — |  |  |  | — |
Deductions |  |  |  |  |  |  | (449 | ) |  |  | (867 | ) |  |  | (276 | )
Foreign currency translation effects |  |  |  |  |  |  | 5 |  |  |  | 355 |  |  |  | 138 |
Allowances for doubtful accounts at end of period |  |  | Ps |  |  |  | 2,145 |  |  |  | 2,196 |  |  |  | 2,152 |

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- Definition Disclosure of detailed information of trade accounts receivables, net. + References No definition available. + Details
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- Definition Text block1 [abstract] + References No definition available. + Details
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- Definition The disclosure of the allowance relating to impairments of financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_10_e&doctype=Standard -URIDate 2017-03-09 + Details
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