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Employee Benefits - Analysis of Net Liability and Net Period Cost for Employee Benefit (Detail) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | $ 118,325,014 | $ 120,297,139 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 13,989,100 | 13,636,182 | $ 14,240,271
Mexico [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 85,517,190 | 84,821,197 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 12,046,208 | 11,586,065 | 12,281,154
Puerto Rico [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 13,986,596 | 13,962,128 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 686,067 | 776,238 | 1,058,131
Europe [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 12,705,926 | 14,833,840 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 619,039 | 385,689 | 226,447
Brazil [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 5,666,694 | 6,276,780 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 579,432 | 735,855 | 633,159
Ecuador [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 448,608 | 403,194 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | $ 58,354 | $ 152,335 | $ 41,380

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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_57_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost and gains (losses) arising from settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_d&doctype=Standard -URIDate 2018-03-16 + Details
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