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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | $ 152,507,058 | $ 118,325,014 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 16,609,565 | 13,989,100 | $ 13,636,182
Mexico [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 116,537,660 | 85,517,190 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 12,788,464 | 12,046,208 | 11,586,065
Puerto Rico [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 13,228,592 | 13,986,596 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 747,755 | 686,067 | 776,238
Europe [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 12,827,318 | 12,705,926 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 2,526,957 | 619,039 | 385,689
Brazil [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 9,503,738 | 5,666,694 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | 511,964 | 579,432 | 735,855
Ecuador [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Liabilities | 409,750 | 448,608 |
Net period cost (benefit) |  |  |
Net period cost (benefit) | $ 34,425 | $ 58,354 | $ 152,335

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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 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_d&doctype=Standard -URIDate 2019-03-27 + Details
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