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Post-Employment and Other Non-current Employee Benefits - Summary of Changes in Balance of Trust Assets (Detail) - MXN ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Trust Assets [line items] |  |  |
Foreign exchange gain | $ 9 | $ (3) | $ (43)
Trust Assets | Pension and Retirement Plans |  |  |
Disclosure Of Trust Assets [line items] |  |  |
Initial balance | 1,201 | 1,122 | 1,031
Actual return on trust assets | 33 | 75 | 81
Foreign exchange gain | 0 | 4 | 2
Life annuities | 0 | 0 | 8
Balance at end of year | 1,234 | 1,201 | 1,122
Trust Assets | Seniority premiums |  |  |
Disclosure Of Trust Assets [line items] |  |  |
Initial balance | 137 | 127 | 111
Actual return on trust assets | (4) | 10 | 16
Balance at end of year | $ 133 | $ 137 | $ 127

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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_57_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_c_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Disclosure of trust assets [line items] + References No definition available. + Details
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- Definition Life annuities, net defined benefit liability (asset) + References No definition available. + Details
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- Details
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- Details
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