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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Service costs ₱ 1,042 ₱ 1,016 ₱ 1,093
Interest costs on benefit obligation 24 (73) 190
Actual gain on plan assets (918) (3,766) 562
Funded (unfunded) status - net (3,391) (3,442) 408
Accrued benefit costs 3,548 3,541 482
Prepaid benefit costs 157 99 890
Curtailment/settlement losses and other adjustments 130 272 261
Net periodic benefit costs 1,196 1,215 1,544
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 17,964 15,883 22,298
Service costs 1,042 1,016 1,093
Interest costs on benefit obligation 1,043 1,065 1,173
Actuarial losses on obligations – experience 437 154 78
Actuarial losses (gains) on obligations - economic assumptions (496) 2,303 (3,972)
Actual benefits paid/settlements (2,744) (2,848) (102)
Curtailment and others 130 391 (4,685)
Present value of defined benefit obligations at end of the year 17,376 17,964 15,883
Plan assets [Member]      
Disclosure Of Net Defined Benefit Liability Asset [Line Items]      
Actual benefits paid/settlements (2,820) (2,510) (5,313)
Fair value of plan assets at beginning of the year 14,522 16,291 14,683
Actual contributions 3,201 4,507 6,359
Interest income on plan assets 1,019 1,138 983
Return on plan assets (excluding amount included in net interest) (1,937) (4,904) (421)
Fair value of plan assets at end of the year ₱ 13,985 ₱ 14,522 ₱ 16,291