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Employee Benefits - Amounts Recognized (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 MXN ($)
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Current service cost |  | $ 728 | $ 433 | $ 468
Remeasurements on the Net Defined Benefit Liability | $ (24) | (474) | (1,090) | 551
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
Past service cost |  | 73 | 116 |
Gain or Loss on Settlement or Curtailment |  |  | 2 | (14)
Net Interest on the Net Defined Benefit Liability |  | 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
Past service cost |  | 73 | (45) |
Gain or Loss on Settlement or Curtailment |  |  | 2 | (5)
Net Interest on the Net Defined Benefit Liability |  | 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
Past service cost |  |  | 161 |
Gain or Loss on Settlement or Curtailment |  |  |  | (8)
Net Interest on the Net Defined Benefit Liability |  | 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)
Net Interest on the Net Defined Benefit Liability |  | 54 | 32 | 34
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income [member] |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Remeasurements on the Net Defined Benefit Liability |  | 2,849 | 2,166 | 646
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income [member] | Pension and retirement plans [member] |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Remeasurements on the Net Defined Benefit Liability |  | 2,024 | 1,608 | 668
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income [member] | Seniority premiums [member] |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Remeasurements on the Net Defined Benefit Liability |  | 483 | 162 | (63)
Net benefit cost recognized in consolidated statements of accumulated other comprehensive income [member] | Post retirement medical services [member] |  |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |  |
Remeasurements on the Net Defined Benefit Liability |  | $ 342 | $ 396 | $ 41

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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 other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_91_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_d&doctype=Standard -URIDate 2020-01-01 + Details
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