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Employee Benefits - Summary of Net Defined Benefit Liability Asset (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | $ 4,515 | $ 3,688 |
Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 1,110 | 661 |
Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 722 | 350 |
Net benefit cost recognized in the consolidated statements of income [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 433 | 468 | $ 374
Gain or Loss on Settlement or Curtailment | 2 | (14) | (3)
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 379 | 387 | 319
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 | 279 | 318 | 244
Gain or Loss on Settlement or Curtailment | 2 | (5) | (2)
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 290 | 304 | 248
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 | 139 | 125 | 106
Gain or Loss on Settlement or Curtailment |  | (8) | (1)
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 57 | 49 | 41
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 | 15 | 25 | 24
Gain or Loss on Settlement or Curtailment |  | (1) |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 32 | $ 34 | $ 30
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 | 469 |  |
Gain or Loss on Settlement or Curtailment | 1 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 318 |  |
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 | 180 |  |
Gain or Loss on Settlement or Curtailment | 1 |  |
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 | 283 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 52 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate +1% [member] | Discount rates [member] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 6 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 29 |  |
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 | 525 |  |
Gain or Loss on Settlement or Curtailment | 2 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 391 |  |
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 | 205 |  |
Gain or Loss on Settlement or Curtailment | 2 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 329 |  |
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 | 320 |  |
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] | Medical cost trend rates [Member] | Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 8 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 40 |  |
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 | 524 |  |
Gain or Loss on Settlement or Curtailment | 2 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 460 |  |
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 | 199 |  |
Gain or Loss on Settlement or Curtailment | 2 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 356 |  |
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 | 317 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 63 |  |
Net benefit cost recognized in the consolidated statements of income [member] | Discount rate -1% [member] | Discount rates [member] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 8 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 41 |  |
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 | 459 |  |
Gain or Loss on Settlement or Curtailment | 1 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 320 |  |
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 | 178 |  |
Gain or Loss on Settlement or Curtailment | 1 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 267 |  |
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 | 281 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 53 |  |
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 | 6 |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 30 |  |
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 Liabilility (Assets) | 1,861 |  |
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 Liabilility (Assets) | 1,379 |  |
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 Liabilility (Assets) | 147 |  |
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate +1% [member] | Discount rates [member] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 335 |  |
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 Liabilility (Assets) | 1,671 |  |
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 Liabilility (Assets) | 1,493 |  |
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 Liabilility (Assets) | 178 |  |
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 Liabilility (Assets) | 431 |  |
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 Liabilility (Assets) | 1,958 |  |
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 Liabilility (Assets) | 1,528 |  |
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 Liabilility (Assets) | 1 |  |
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate -1% [member] | Discount rates [member] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 429 |  |
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 Liabilility (Assets) | 1,555 |  |
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 Liabilility (Assets) | 1,408 |  |
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 Liabilility (Assets) | 147 |  |
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 Liabilility (Assets) | $ 333 |  |

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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 2019-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_a&doctype=Standard -URIDate 2019-03-27 + Details
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