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Post-Employment and Other Non-current Employee Benefits - Summary of Employee Benefits Expense (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Employee benefits expense [line items] |  |  |
Total employee benefits expense | $ 31,174 | $ 26,193 | $ 28,551
Cost of goods sold [member] |  |  |
Employee benefits expense [line items] |  |  |
Wages and salaries | 4,295 | 4,323 | 4,827
Social security costs | 1,320 | 1,449 | 1,234
Employee profit sharing | 74 | 75 | 142
Pension and seniority premium costs | 26 | 22 | 57
Share-based payment expense | 3 | 6 | 11
Selling and distribution expenses [member] |  |  |
Employee benefits expense [line items] |  |  |
Wages and salaries | 16,590 | 12,001 | 13,526
Social security costs | 4,651 | 4,417 | 4,571
Employee profit sharing | 496 | 484 | 485
Pension and seniority premium costs | 158 | 125 | 65
Share-based payment expense | 11 | 7 | 18
Administrative expenses [member] |  |  |
Employee benefits expense [line items] |  |  |
Wages and salaries | 2,771 | 2,453 | 2,839
Social security costs | 557 | 585 | 472
Employee profit sharing | 31 | 31 | 56
Pension and seniority premium costs | 46 | 42 | 66
Post-employment benefits other | 2 | 10 | 5
Share-based payment expense | $ 143 | $ 161 | $ 177

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- Definition Adjustments for share-based payments to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 20 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_20_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_102&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_99&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_104&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of employee expenses that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_5&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition A class of employee benefits expense that represents social security contributions. [Refer: Employee benefits expense] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 9 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_9&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition A class of employee benefits expense that represents wages and salaries. [Refer: Employee benefits expense] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 9 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_9&doctype=Standard -URIDate 2018-03-16 + Details
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