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Employee Benefits - Amounts Recognized in the Income Statement and the Statement of Comprehensive Income (Details) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) | [1] | Dec. 31, 2024 MXN ($) | Dec. 31, 2023 MXN ($) | Dec. 31, 2022 MXN ($)
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Current Service Cost |  | $ 1,052 | $ 910 | $ 854
Remeasurements of the Net Defined Benefit Liability | $ (49) | (1,016) | 160 | 661
Net benefit cost recognized in the consolidated statements of income |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Current Service Cost |  | 929 | 866 | 894
Past Service Cost |  | 429 | 322 | 236
Gain or Loss on Settlement or Curtailment |  | (306) | (278) | (276)
Net Interest on the Net Defined Benefit Liability |  | 587 | 590 | 508
Net benefit cost recognized in the consolidated statements of income | Pension and Retirement Plans |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Current Service Cost |  | 505 | 489 | 534
Past Service Cost |  | 304 | 288 | 189
Gain or Loss on Settlement or Curtailment |  | (254) | (243) | (220)
Net Interest on the Net Defined Benefit Liability |  | 339 | 367 | 313
Net benefit cost recognized in the consolidated statements of income | Seniority Premiums |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Current Service Cost |  | 394 | 345 | 328
Past Service Cost |  | 89 | 21 | 21
Gain or Loss on Settlement or Curtailment |  | (27) | (21) | (27)
Net Interest on the Net Defined Benefit Liability |  | 200 | 178 | 150
Net benefit cost recognized in the consolidated statements of income | Post-Retirement Medical Services |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Current Service Cost |  | 30 | 32 | 32
Past Service Cost |  | 36 | 13 | 26
Gain or Loss on Settlement or Curtailment |  | (25) | (14) | (29)
Net Interest on the Net Defined Benefit Liability |  | 48 | 45 | 45
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Remeasurements of the Net Defined Benefit Liability |  | 2,404 | 1,399 | 1,689
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income | Pension and Retirement Plans |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Remeasurements of the Net Defined Benefit Liability |  | 2,019 | 1,311 | 1,686
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income | Seniority Premiums |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Remeasurements of the Net Defined Benefit Liability |  | 441 | 117 | 38
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income | Post-Retirement Medical Services |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Remeasurements of the Net Defined Benefit Liability |  | $ (56) | $ (29) | $ (35)
[1] | Convenience translation to U.S. dollars ($) – See Note 2.2.4

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- Definition Gains (losses) arising from settlements or curtailments net defined benefit liability asset. + References No definition available. + 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 increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; 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 b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [domain]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_91_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_135_b&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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