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Employee Benefits - Effect of Variation in Assumptions (Details) - 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] |  |  |
Percentage of reasonably possible decrease in actuarial assumption | 1.00% |  |
Percentage of reasonably possible increase in actuarial assumption | 1.00% |  |
Current Service Cost | $ 1,052 | $ 910 | $ 854
Remeasurements of the Net Defined Benefit Liability (Assets) | 8,760 | 6,920 |
Pension and Retirement Plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 5,428 | 4,402 |
Seniority Premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,846 | 2,058 |
Post-Retirement Medical Services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 486 | 460 |
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
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
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
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
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 the consolidated statements of income | Discount rate +1% | Actuarial assumption of discount rates |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 1,279 |  |
Gain or Loss on Settlement or Curtailment | (298) |  |
Net Interest on the Net Defined Benefit Liability | 506 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Actuarial assumption of discount rates | Pension and Retirement Plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 771 |  |
Gain or Loss on Settlement or Curtailment | (252) |  |
Net Interest on the Net Defined Benefit Liability | 283 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Actuarial assumption of discount rates | Seniority Premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 454 |  |
Gain or Loss on Settlement or Curtailment | (25) |  |
Net Interest on the Net Defined Benefit Liability | 185 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Actuarial assumption of discount rates | Post-Retirement Medical Services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 54 |  |
Gain or Loss on Settlement or Curtailment | (21) |  |
Net Interest on the Net Defined Benefit Liability | 38 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Actuarial assumption of expected rates of salary increases |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 1,386 |  |
Gain or Loss on Settlement or Curtailment | (317) |  |
Net Interest on the Net Defined Benefit Liability | 609 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Actuarial assumption of expected rates of salary increases | Pension and Retirement Plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 874 |  |
Gain or Loss on Settlement or Curtailment | (289) |  |
Net Interest on the Net Defined Benefit Liability | 404 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Actuarial assumption of expected rates of salary increases | Seniority Premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 512 |  |
Gain or Loss on Settlement or Curtailment | (28) |  |
Net Interest on the Net Defined Benefit Liability | 205 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Postretirement medical services | Post-Retirement Medical Services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 80 |  |
Gain or Loss on Settlement or Curtailment | (30) |  |
Net Interest on the Net Defined Benefit Liability | 54 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Actuarial assumption of discount rates |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 1,459 |  |
Gain or Loss on Settlement or Curtailment | (339) |  |
Net Interest on the Net Defined Benefit Liability | 718 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Actuarial assumption of discount rates | Pension and Retirement Plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 873 |  |
Gain or Loss on Settlement or Curtailment | (280) |  |
Net Interest on the Net Defined Benefit Liability | 446 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Actuarial assumption of discount rates | Seniority Premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 507 |  |
Gain or Loss on Settlement or Curtailment | (29) |  |
Net Interest on the Net Defined Benefit Liability | 217 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Actuarial assumption of discount rates | Post-Retirement Medical Services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 79 |  |
Gain or Loss on Settlement or Curtailment | (30) |  |
Net Interest on the Net Defined Benefit Liability | 55 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Actuarial assumption of expected rates of salary increases |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 1,204 |  |
Gain or Loss on Settlement or Curtailment | (274) |  |
Net Interest on the Net Defined Benefit Liability | 507 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Actuarial assumption of expected rates of salary increases | Pension and Retirement Plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 751 |  |
Gain or Loss on Settlement or Curtailment | (248) |  |
Net Interest on the Net Defined Benefit Liability | 313 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Actuarial assumption of expected rates of salary increases | Seniority Premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 453 |  |
Gain or Loss on Settlement or Curtailment | (26) |  |
Net Interest on the Net Defined Benefit Liability | 194 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Postretirement medical services | Post-Retirement Medical Services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 53 |  |
Gain or Loss on Settlement or Curtailment | (21) |  |
Net Interest on the Net Defined Benefit Liability | 39 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Actuarial assumption of discount rates |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,675 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Actuarial assumption of discount rates | Pension and Retirement Plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,316 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Actuarial assumption of discount rates | Seniority Premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 408 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Actuarial assumption of discount rates | Post-Retirement Medical Services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | (49) |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Actuarial assumption of expected rates of salary increases |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 3,019 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Actuarial assumption of expected rates of salary increases | Pension and Retirement Plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,564 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Actuarial assumption of expected rates of salary increases | Seniority Premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 455 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Postretirement medical services | Post-Retirement Medical Services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | (76) |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Actuarial assumption of discount rates |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,999 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Actuarial assumption of discount rates | Pension and Retirement Plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,594 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Actuarial assumption of discount rates | Seniority Premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 480 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Actuarial assumption of discount rates | Post-Retirement Medical Services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | (75) |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Actuarial assumption of expected rates of salary increases |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,759 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Actuarial assumption of expected rates of salary increases | Pension and Retirement Plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,334 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Actuarial assumption of expected rates of salary increases | Seniority Premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 425 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Postretirement medical services | Post-Retirement Medical Services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | $ (49) |  |

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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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