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Employee Benefits - Effect of variation in assumptions (Details) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Percentage of reasonably possible decrease in actuarial assumption | 1.00% |  |
Current service cost | $ 766 | $ 729 | $ 549
Pension and retirement plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 5,063 | 4,891 |
Seniority premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 1,975 | 1,626 |
Post retirement medical services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | $ 562 | 736 |
Discount rates |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Percentage of reasonably possible increase in actuarial assumption | 1.00% |  |
Net benefit cost recognized in the consolidated statements of income |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | $ 724 | 656 | 433
Gain or Loss on Settlement or Curtailment | (82) |  | 2
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 485 | 450 | 379
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 | 390 | 372 | 279
Gain or Loss on Settlement or Curtailment | (55) |  | 2
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 319 | 305 | 290
Net benefit cost recognized in the consolidated statements of income | Seniority premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 290 | 239 | 139
Gain or Loss on Settlement or Curtailment | (3) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 114 | 91 | 57
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 | 44 | 44 | 15
Gain or Loss on Settlement or Curtailment | (24) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 52 | $ 54 | $ 32
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Discount rates |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 699 |  |
Gain or Loss on Settlement or Curtailment | (76) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 373 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Discount rates | Pension and retirement plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 394 |  |
Gain or Loss on Settlement or Curtailment | (54) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 232 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Discount rates | Seniority premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 266 |  |
Gain or Loss on Settlement or Curtailment | (3) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 100 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Discount rates | Post retirement medical services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 39 |  |
Gain or Loss on Settlement or Curtailment | (19) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 41 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Future salary growth |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 815 |  |
Gain or Loss on Settlement or Curtailment | (84) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 533 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Future salary growth | Pension and retirement plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 467 |  |
Gain or Loss on Settlement or Curtailment | (56) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 362 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Future salary growth | Seniority premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 302 |  |
Gain or Loss on Settlement or Curtailment | (4) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 119 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Future salary growth | Post retirement medical services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 46 |  |
Gain or Loss on Settlement or Curtailment | (24) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 52 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate +1% | Medical cost trend 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 | (26) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 56 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Seniority premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 267 |  |
Gain or Loss on Settlement or Curtailment | (3) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 102 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Discount rates |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 823 |  |
Gain or Loss on Settlement or Curtailment | (85) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 565 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Discount rates | Pension and retirement plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 465 |  |
Gain or Loss on Settlement or Curtailment | (56) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 384 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Discount rates | Seniority premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 307 |  |
Gain or Loss on Settlement or Curtailment | (3) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 124 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Discount rates | Post retirement medical services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 51 |  |
Gain or Loss on Settlement or Curtailment | (26) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 57 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Future salary growth |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 703 |  |
Gain or Loss on Settlement or Curtailment | (81) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 430 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Future salary growth | Pension and retirement plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 390 |  |
Gain or Loss on Settlement or Curtailment | (54) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 276 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Future salary growth | Seniority premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 46 |  |
Gain or Loss on Settlement or Curtailment | (24) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 52 |  |
Net benefit cost recognized in the consolidated statements of income | Discount rate -1% | Medical cost trend rates | Post retirement medical services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 39 |  |
Gain or Loss on Settlement or Curtailment | (19) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 42 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Discount rates |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,418 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Discount rates | Pension and retirement plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 1,858 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Discount rates | Seniority premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 440 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Discount rates | Post retirement medical services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 120 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Future salary growth |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,869 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Future salary growth | Pension and retirement plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,039 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Future salary growth | Seniority premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 682 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Future salary growth | Post retirement medical services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 148 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% | Medical cost trend rates | Post retirement medical services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 149 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | 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% | Discount rates |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,895 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Discount rates | Pension and retirement plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,086 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Discount rates | Seniority premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 660 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Discount rates | Post retirement medical services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 149 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Future salary growth |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,456 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Future salary growth | Pension and retirement plans |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 1,883 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Future salary growth | Seniority premiums |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 148 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% | Medical cost trend rates | Post retirement medical services |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | $ 120 |  |

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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 2021-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_a&doctype=Standard -URIDate 2021-03-24 + Details
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