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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 Benefit Pension Plans (Detail) - PHP (₱)
₱ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Service costs ₱ 1,313 ₱ 1,043 ₱ 1,063
Interest costs on benefit obligation 734 (22) 457
Unfunded status – net (13,197) (8,914) (7,144)
Accrued benefit costs 13,342 8,985 7,159
Prepaid benefit costs (Note 19) 145 71 15
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 Net Defined Benefit Liability Asset [Line Items]      
Present value of defined benefit obligations at beginning of the year 22,638 20,683 21,503
Actuarial losses on obligations – economic assumptions 3,507 3,829 (2,611)
Service costs 1,313 1,043 1,063
Interest costs on benefit obligation 1,056 1,338 1,227
Actuarial losses on obligations – experience 265 570 419
Actual benefits paid/settlements (369) (4,558) (887)
Actuarial losses on obligations – demographic assumptions   4  
Curtailments and others (213) (271) (31)
Present value of defined benefit obligations at end of the year 28,197 22,638 20,683
Plan assets [Member]      
Disclosure Of Net Defined Benefit Liability Asset [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