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Employee Benefits - Effect of variation in assumptions (Detail) - MXN ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Percentage of reasonably possible decrease in actuarial assumption | 1.00% |  |
Current service cost | $ 728 | $ 433 | $ 468
Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 4,891 | 4,515 |
Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 1,626 | 1,110 |
Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | $ 736 | 722 |
Discount rates [member] |  |  |
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 [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | $ 656 | 433 | 468
Gain or Loss on Settlement or Curtailment |  | 2 | (14)
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 450 | 379 | 387
Net benefit cost recognized in the consolidated statements of income [member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 372 | 279 | 318
Gain or Loss on Settlement or Curtailment |  | 2 | (5)
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 305 | 290 | 304
Net benefit cost recognized in the consolidated statements of income [member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 239 | 139 | 125
Gain or Loss on Settlement or Curtailment |  |  | (8)
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 91 | 57 | 49
Net benefit cost recognized in the consolidated statements of income [member] | Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 44 | 15 | 25
Gain or Loss on Settlement or Curtailment |  |  | (1)
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 54 | $ 32 | $ 34
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Discount rates [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 663 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 364 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Discount rates [member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 400 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 237 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Discount rates [member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 223 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 80 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Discount rates [member] | Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 40 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 47 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Future salary growth [Member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 751 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 486 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Future salary growth [Member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 466 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 339 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Future salary growth [Member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 241 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 93 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Future salary growth [Member] | Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 44 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 54 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Medical cost trend rates [Member] | Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 52 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 64 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Discount rates [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 765 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 527 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Discount rates [member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 458 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 366 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Discount rates [member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 257 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 99 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Discount rates [member] | Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 50 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 62 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Future salary growth [Member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 631 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 355 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Future salary growth [Member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 396 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 265 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Future salary growth [Member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 235 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 90 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Medical cost trend rates [Member] | Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 38 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 45 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% [member] | Discount rates [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,506 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% [member] | Discount rates [member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 1,784 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% [member] | Discount rates [member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 432 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% [member] | Discount rates [member] | Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 290 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% [member] | Future salary growth [Member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,840 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% [member] | Future salary growth [Member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 1,984 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% [member] | Future salary growth [Member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 514 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% [member] | Future salary growth [Member] | Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 342 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate +1% [member] | Medical cost trend rates [Member] | Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 375 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% [member] | Discount rates [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,910 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% [member] | Discount rates [member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,025 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% [member] | Discount rates [member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 521 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% [member] | Discount rates [member] | Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 364 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% [member] | Future salary growth [Member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 2,252 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% [member] | Future salary growth [Member] | Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 1,820 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% [member] | Future salary growth [Member] | Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | 432 |  |
Net Benefit Cost Recognized In Consolidated Statements Of Other Comprehensive Income Member | Discount rate -1% [member] | Medical cost trend rates [Member] | Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liability (Assets) | $ 276 |  |

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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 2020-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_a&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_140_a&doctype=Standard -URIDate 2020-01-01 + Details
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