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Post-Employment and Other Non-current Employee Benefits - Summary of Changes in Balance of Defined Benefit Obligation for Post-Employment and Other Non-Current Employee Benefits (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Foreign exchange rate valuation (gain) loss | $ 161 | $ (101) | $ (78)
Pension and Retirement Plans | Present Value of Defined Benefit Obligation |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Balance at beginning of year | 4,028 | 4,199 | 4,515
Current Service Cost | 235 | 233 | 246
Effect of curtailment | (108) | (144) | (86)
Interest expense | 361 | 346 | 317
Actuarial (gains) or losses | 726 | (214) | (355)
Foreign exchange rate valuation (gain) loss | 203 | (151) | (134)
Benefits paid | (462) | (378) | (355)
Past service cost | 101 | 137 | 47
Business acquisitions | 0 | 0 | 4
Balance at end of year | 5,084 | 4,028 | 4,199
Seniority premiums | Present Value of Defined Benefit Obligation |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Balance at beginning of year | 958 | 926 | 978
Current Service Cost | 96 | 87 | 94
Effect of curtailment | (8) | (14) | (9)
Interest expense | 97 | 88 | 76
Actuarial (gains) or losses | 339 | 29 | (97)
Benefits paid | (183) | (166) | (128)
Past service cost | 39 | 8 | 6
Business acquisitions | 0 | 0 | 6
Balance at end of year | $ 1,338 | $ 958 | $ 926

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- Definition The amount of benefits paid or payable for retirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2024-01-01 -Paragraph 35 -Subparagraph b -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=26&code=ifrs-tx-2024-en-r&anchor=para_35_b_v&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_a&doctype=Standard -URIDate 2024-03-27 + Details
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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 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_d&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Actuarial gains (losses) arising from experience adjustments + References No definition available. + Details
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