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Employee Benefits - Summary of Net Defined Benefit Liability Asset (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension and retirement plans [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | $ 3,688 | $ 4,239 |
Seniority premiums [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 661 | 674 |
Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 350 | 460 |
Net benefit cost recognized in the consolidated statements of income [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 468 | 374 | $ 359
Gain or Loss on Settlement or Curtailment | (14) | (3) | (61)
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 387 | 319 | 282
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 | 318 | 244 | 245
Gain or Loss on Settlement or Curtailment | (5) | (2) | (61)
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 304 | 248 | 224
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 | 125 | 106 | 93
Gain or Loss on Settlement or Curtailment | (8) | (1) |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 49 | 41 | 34
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 | 25 | 24 | 21
Gain or Loss on Settlement or Curtailment | (1) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 34 | $ 30 | $ 24
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 | 429 |  |
Gain or Loss on Settlement or Curtailment | (12) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 382 |  |
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 | 284 |  |
Gain or Loss on Settlement or Curtailment | (4) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 291 |  |
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 | 121 |  |
Gain or Loss on Settlement or Curtailment | (7) |  |
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] | Discount rates [member] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 24 |  |
Gain or Loss on Settlement or Curtailment | (1) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 38 |  |
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 | 440 |  |
Gain or Loss on Settlement or Curtailment | (14) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 349 |  |
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 | 309 |  |
Gain or Loss on Settlement or Curtailment | (6) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 296 |  |
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 | 131 |  |
Gain or Loss on Settlement or Curtailment | (8) |  |
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] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 29 |  |
Gain or Loss on Settlement or Curtailment | (1) |  |
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] | Discount rates [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 481 |  |
Gain or Loss on Settlement or Curtailment | (15) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 342 |  |
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 | 324 |  |
Gain or Loss on Settlement or Curtailment | (6) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 261 |  |
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 | 129 |  |
Gain or Loss on Settlement or Curtailment | (8) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 46 |  |
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 | 28 |  |
Gain or Loss on Settlement or Curtailment | (1) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 35 |  |
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 | 404 |  |
Gain or Loss on Settlement or Curtailment | (10) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 286 |  |
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 | 284 |  |
Gain or Loss on Settlement or Curtailment | (3) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 239 |  |
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 | 120 |  |
Gain or Loss on Settlement or Curtailment | (7) |  |
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] | Medical cost trend rates [Member] | Post retirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Current service cost | 24 |  |
Gain or Loss on Settlement or Curtailment | (1) |  |
Effect of Net Interest on the Net Defined Benefit Liability (Asset) | 34 |  |
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) | 332 |  |
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) | 391 |  |
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) | (79) |  |
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) | 20 |  |
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) | 543 |  |
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) | 610 |  |
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) | (67) |  |
Net benefit cost recognized in consolidated statements of other comprehensive income [member] | Discount rate +1% [member] | Medical cost trend rates [Member] | Postretirement medical services [member] |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Remeasurements of the Net Defined Benefit Liabilility (Assets) | 33 |  |
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) | 547 |  |
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) | 571 |  |
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) | (61) |  |
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) | 37 |  |
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) | 372 |  |
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) | 444 |  |
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) | (72) |  |
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) | $ 23 |  |

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