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Pension and Other Employee Benefits - Summary of Changes in Present Value of Defined Benefit Obligations, Fair Value of Plan Assets and Components of Net Periodic Benefit Costs of Defined Contribution Plans (Detail) - PHP (₱) ₱ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Fair Value Of Plan Assets [Line Items]
Service costs	₱ 1,313	₱ 1,043	₱ 1,063
Accrued benefit costs	13,342	8,985	7,159
Interest costs on benefit obligation	734	(22)	457
Curtailment/settlement losses (gains) and other adjustments	(99)	(181)	21
Net periodic benefit costs (Note 5)	1,948	840	1,541
Present value of defined benefit obligation [Member]
Disclosure Of Fair Value Of Plan Assets [Line Items]
Present value of defined benefit obligations at beginning of the year	22,638	20,683	21,503
Service costs	1,313	1,043	1,063
Actuarial losses – experience	(3,507)	(3,829)	2,611
Actuarial losses – economic assumptions		(4)
Actual benefits paid/settlements	(369)	(4,558)	(887)
Present value of defined benefit obligations at end of the year	28,197	22,638	20,683
Interest costs on benefit obligation	1,056	1,338	1,227
Plan assets [Member]
Disclosure Of Fair Value Of Plan Assets [Line Items]
Actual benefits paid/settlements	(369)	(4,558)	(887)
Fair value of plan assets at beginning of the year	13,724	13,539	12,534
Actual contributions	3,227	7,598	5,110
Interest income on plan assets	322	1,360	770
Return on plan assets (excluding amount included in net interest)	(1,904)	(4,215)	(3,988)
Fair value of plan assets at end of the year	15,000	13,724	13,539
Investment Property [Member]
Disclosure Of Fair Value Of Plan Assets [Line Items]
Service costs	294	239	314
Others		(39)
Funded status – net	876	271	355
Accrued benefit costs			23
Prepaid benefit costs (Note 19)	876	271	378
Interest costs on benefit obligation	(24)	(16)
Curtailment/settlement losses (gains) and other adjustments		(6)
Net periodic benefit costs (Note 5)	270	178	314
Investment Property [Member] | Present value of defined benefit obligation [Member]
Disclosure Of Fair Value Of Plan Assets [Line Items]
Present value of defined benefit obligations at beginning of the year	2,813	2,804	2,490
Service costs	294	239	314
Interest costs on benefit obligation	118	174
Actuarial losses – experience	69	100
Actuarial losses – economic assumptions	28	13
Actual benefits paid/settlements	(567)	(37)
Curtailment and others	20	(480)
Present value of defined benefit obligations at end of the year	2,775	2,813	2,804
Investment Property [Member] | Plan assets [Member]
Disclosure Of Fair Value Of Plan Assets [Line Items]
Actual benefits paid/settlements		(37)
Fair value of plan assets at beginning of the year	3,084	3,159	2,862
Actual contributions	282	281	297
Interest income on plan assets	142	190
Return on plan assets (excluding amount included in net interest)	143	100
Others		(609)
Fair value of plan assets at end of the year	₱ 3,651	₱ 3,084	₱ 3,159

X

- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2020-01-01
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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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

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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
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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.

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No definition available.

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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
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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
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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

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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 plans 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]; Interest expense (income), net defined benefit liability (asset)]

+ References

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Accrued benefit costs.

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Defined benefit plan net periodic benefit cost.

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Funded status net.

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Gains (losses) arising from settlements or curtailments net defined benefit liability asset.

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No definition available.

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Interest costs on benefit obligation.

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Interest income on plan assets.

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Prepaid benefit costs.

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