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Employee Benefits - Effect of variation in assumptions (Details) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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 | $ 910 | $ 854 | $ 684
Remeasurements of the Net Defined Benefit Liability (Assets) | 6,920 | 7,048 |
Pension and Retirement Plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 4,402 | 4,640 |
Seniority Premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,058 | 1,940 |
Post-Retirement Medical Services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 460 | 468 |
Net benefit cost recognized in the consolidated statements of income |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 866 | 894 | 724
Gain or Loss on Settlement or Curtailment | 278 | 276 | 82
Net Interest on the Net Defined Benefit Liability | 590 | 508 | 485
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 | 489 | 534 | 390
Gain or Loss on Settlement or Curtailment | 243 | 220 | 55
Net Interest on the Net Defined Benefit Liability | 367 | 313 | 319
Net benefit cost recognized in the consolidated statements of income | Seniority Premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current Service Cost | 345 | 328 | 290
Gain or Loss on Settlement or Curtailment | 21 | 27 | 3
Net Interest on the Net Defined Benefit Liability | 178 | 150 | 114
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 | 32 | 32 | 44
Gain or Loss on Settlement or Curtailment | 14 | 29 | 24
Net Interest on the Net Defined Benefit Liability | 45 | $ 45 | $ 52
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 | 1,027 |  |
Gain or Loss on Settlement or Curtailment | (226) |  |
Net Interest on the Net Defined Benefit Liability | 451 |  |
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 | 644 |  |
Gain or Loss on Settlement or Curtailment | (199) |  |
Net Interest on the Net Defined Benefit Liability | 250 |  |
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 | 346 |  |
Gain or Loss on Settlement or Curtailment | (17) |  |
Net Interest on the Net Defined Benefit Liability | 164 |  |
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 | 37 |  |
Gain or Loss on Settlement or Curtailment | (10) |  |
Net Interest on the Net Defined Benefit Liability | 37 |  |
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 | 1,216 |  |
Gain or Loss on Settlement or Curtailment | (247) |  |
Net Interest on the Net Defined Benefit Liability | 602 |  |
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 | 834 |  |
Gain or Loss on Settlement or Curtailment | (227) |  |
Net Interest on the Net Defined Benefit Liability | 413 |  |
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 | 382 |  |
Gain or Loss on Settlement or Curtailment | (20) |  |
Net Interest on the Net Defined Benefit Liability | 189 |  |
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 | 52 |  |
Gain or Loss on Settlement or Curtailment | (14) |  |
Net Interest on the Net Defined Benefit Liability | 52 |  |
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 | 1,269 |  |
Gain or Loss on Settlement or Curtailment | (265) |  |
Net Interest on the Net Defined Benefit Liability | 714 |  |
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 | 830 |  |
Gain or Loss on Settlement or Curtailment | (232) |  |
Net Interest on the Net Defined Benefit Liability | 468 |  |
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 | 387 |  |
Gain or Loss on Settlement or Curtailment | (19) |  |
Net Interest on the Net Defined Benefit Liability | 194 |  |
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 | 52 |  |
Gain or Loss on Settlement or Curtailment | (14) |  |
Net Interest on the Net Defined Benefit Liability | 52 |  |
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 | 1,057 |  |
Gain or Loss on Settlement or Curtailment | (216) |  |
Net Interest on the Net Defined Benefit Liability | 479 |  |
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 | 711 |  |
Gain or Loss on Settlement or Curtailment | (199) |  |
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 | 346 |  |
Gain or Loss on Settlement or Curtailment | (17) |  |
Net Interest on the Net Defined Benefit Liability | 166 |  |
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 | 36 |  |
Gain or Loss on Settlement or Curtailment | (9) |  |
Net Interest on the Net Defined Benefit Liability | 37 |  |
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) | 1,377 |  |
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) | 1,289 |  |
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) | 108 |  |
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) | (20) |  |
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) | 1,495 |  |
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) | 1,358 |  |
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) | 137 |  |
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) | (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) | 1,473 |  |
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) | 1,384 |  |
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) | 128 |  |
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) | (39) |  |
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) | 1,429 |  |
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) | 1,327 |  |
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) | 102 |  |
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) | $ (20) |  |

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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 2023-01-01 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_a&doctype=Standard -URIDate 2023-03-23 + Details
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