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Post-Employment and Other Non-current Employee Benefits - Summary of Amounts Recognized in Consolidated Income Statements and Consolidated Statements of Comprehensive Income (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Net benefit cost recognized in the Consolidated Statements of Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Current service cost | $ 205 | $ 237
Past service cost | 32 | 0
Gain or Loss on Settlement or curtailment | 2 | (5)
Net Interest on the net Defined Benifit Liability | 200 | 299
Net benefit cost recognized in Consolidated Statements of Accumulated Other Comprehensive Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Remeasurements of the Net Defined Benefit Liability net of taxes | 855 | 344
Actuarial assumption of expected rates of salary increases [member] | Net benefit cost recognized in the Consolidated Statements of Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Current service cost | 223 |
Past service cost | 36 |
Gain or Loss on Settlement or curtailment | 2 |
Net Interest on the net Defined Benifit Liability | 230 |
Actuarial assumption of expected rates of salary increases [member] | Net benefit cost recognized in Consolidated Statements of Accumulated Other Comprehensive Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Remeasurements of the Net Defined Benefit Liability net of taxes | 964 |
Actuarial assumption of discount rates [member] | Net benefit cost recognized in the Consolidated Statements of Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Current service cost | 192 |
Past service cost | 31 |
Gain or Loss on Settlement or curtailment | 1 |
Net Interest on the net Defined Benifit Liability | 171 |
Actuarial assumption of discount rates [member] | Net benefit cost recognized in Consolidated Statements of Accumulated Other Comprehensive Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Remeasurements of the Net Defined Benefit Liability net of taxes | 881 |
Pension and retirement plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Remeasurements of the Net Defined Benefit Liability net of taxes | 2,790 | 2,354
Pension and retirement plans [member] | Net benefit cost recognized in the Consolidated Statements of Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Current service cost | 170 | 195
Past service cost | (44) | 0
Gain or Loss on Settlement or curtailment | 2 | (5)
Net Interest on the net Defined Benifit Liability | 176 | 265
Pension and retirement plans [member] | Net benefit cost recognized in Consolidated Statements of Accumulated Other Comprehensive Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Remeasurements of the Net Defined Benefit Liability net of taxes | 790 | 370
Pension and retirement plans [member] | Actuarial assumption of expected rates of salary increases [member] | Net benefit cost recognized in the Consolidated Statements of Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Current service cost | 184 |
Past service cost | (47) |
Gain or Loss on Settlement or curtailment | 2 |
Net Interest on the net Defined Benifit Liability | 201 |
Pension and retirement plans [member] | Actuarial assumption of expected rates of salary increases [member] | Net benefit cost recognized in Consolidated Statements of Accumulated Other Comprehensive Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Remeasurements of the Net Defined Benefit Liability net of taxes | 844 |
Pension and retirement plans [member] | Actuarial assumption of discount rates [member] | Net benefit cost recognized in the Consolidated Statements of Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Current service cost | 158 |
Past service cost | (41) |
Gain or Loss on Settlement or curtailment | 1 |
Net Interest on the net Defined Benifit Liability | 148 |
Pension and retirement plans [member] | Actuarial assumption of discount rates [member] | Net benefit cost recognized in Consolidated Statements of Accumulated Other Comprehensive Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Remeasurements of the Net Defined Benefit Liability net of taxes | 781 |
Seniority premium plan [member] | Net benefit cost recognized in the Consolidated Statements of Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Current service cost | 35 | 42
Past service cost | 76 | 0
Gain or Loss on Settlement or curtailment | 0 | 0
Net Interest on the net Defined Benifit Liability | 24 | 34
Seniority premium plan [member] | Net benefit cost recognized in Consolidated Statements of Accumulated Other Comprehensive Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Remeasurements of the Net Defined Benefit Liability net of taxes | 65 | $ (26)
Seniority premium plan [member] | Actuarial assumption of expected rates of salary increases [member] | Net benefit cost recognized in the Consolidated Statements of Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Current service cost | 39 |
Past service cost | 83 |
Gain or Loss on Settlement or curtailment | 0 |
Net Interest on the net Defined Benifit Liability | 29 |
Seniority premium plan [member] | Actuarial assumption of expected rates of salary increases [member] | Net benefit cost recognized in Consolidated Statements of Accumulated Other Comprehensive Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Remeasurements of the Net Defined Benefit Liability net of taxes | 120 |
Seniority premium plan [member] | Actuarial assumption of discount rates [member] | Net benefit cost recognized in the Consolidated Statements of Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Current service cost | 34 |
Past service cost | 72 |
Gain or Loss on Settlement or curtailment | 0 |
Net Interest on the net Defined Benifit Liability | 23 |
Seniority premium plan [member] | Actuarial assumption of discount rates [member] | Net benefit cost recognized in Consolidated Statements of Accumulated Other Comprehensive Income [member] |  |
Disclosure of defined benefit plans [line items] |  |
Remeasurements of the Net Defined Benefit Liability net of taxes | $ 100 |

X
- 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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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from settlements. Settlements are transactions that eliminate all further legal or constructive obligations for part or all of the benefits provided under a defined benefit plan, other than a payment of benefits to, or on behalf of, employees that is set out in the terms of the plan and included in the actuarial assumptions. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_d&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_b&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_140_a&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_d&doctype=Standard -URIDate 2019-03-27 + Details
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