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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Fair Value Of Plan Assets [Line Items]
Service costs	₱ 1,043	₱ 1,063	₱ 1,158
Accrued benefit costs	8,985	7,159	8,984
Interest income	(22)	457	539
Net periodic benefit costs (Note 5)	840	1,541	1,356
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	20,683	21,503	23,142
Service costs	1,043	1,063	1,158
Actuarial losses (gains) – experience	(3,829)	2,611	1,277
Actuarial losses – economic assumptions	(4)
Actual benefits paid/settlements	(4,558)	(887)	(2,723)
Present value of defined benefit obligations at end of the year	22,638	20,683	21,503
Interest income	1,338	1,227	1,180
Plan assets [Member]
Disclosure Of Fair Value Of Plan Assets [Line Items]
Actual benefits paid/settlements	(4,558)	(887)	(2,723)
Fair value of plan assets at beginning of the year	13,539	12,534	11,960
Actual contributions	7,598	5,110	5,122
Interest income on plan assets	1,360	770	641
Return on plan assets (excluding amount included in net interest)	(4,215)	(3,988)	(2,466)
Fair value of plan assets at end of the year	13,724	13,539	12,534
Investment property [member]
Disclosure Of Fair Value Of Plan Assets [Line Items]
Service costs	239	314	269
Curtailment and others	(6)
Others	(39)		(18)
Funded status – net	271	355	372
Accrued benefit costs		23	13
Prepaid benefit costs (Note 19)	271	378	385
Interest income	(16)
Net periodic benefit costs (Note 5)	178	314	251
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	2,804	2,490	2,177
Service costs	239	314	269
Interest costs on benefit obligation	174		113
Actuarial losses (gains) – experience	100		(6)
Actuarial losses – economic assumptions	13		29
Actual benefits paid/settlements	(37)		(92)
Curtailment and others	(480)
Present value of defined benefit obligations at end of the year	2,813	2,804	2,490
Investment property [member] | Plan assets [Member]
Disclosure Of Fair Value Of Plan Assets [Line Items]
Actual benefits paid/settlements	(37)		(92)
Fair value of plan assets at beginning of the year	3,159	2,862	2,414
Actual contributions	281	297	335
Interest income on plan assets	190		131
Return on plan assets (excluding amount included in net interest)	100		74
Others	(609)
Fair value of plan assets at end of the year	₱ 3,084	₱ 3,159	₱ 2,862

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 2019-01-01
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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

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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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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

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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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- 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

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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

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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

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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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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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No definition available.

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