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Pension and Other Employee Benefits - Summary of Sensitivity Analysis on Defined Benefit Obligation of Defined Benefit Pension Plans (Detail) - PHP (₱)
₱ in Millions
Dec. 31, 2024
Dec. 31, 2023
Actuarial assumption of discount rates [Member]    
Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Line Items]    
Increase (decrease) in defined benefit obligation due to 1% increase ₱ 15,251 ₱ 15,251
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ (19,348) ₱ (19,348)
Percentage of increase in defined benefit obligation 1.00% 1.00%
Percentage of decrease in defined benefit obligation (1.00%) (1.00%)
Actuarial assumption of discount rates [Member] | Defined Contribution Plans [Member]    
Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Line Items]    
Increase (decrease) in defined benefit obligation due to 1% increase ₱ 32 ₱ 32
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ (32) ₱ (32)
Percentage of increase in defined benefit obligation 1.00% 1.00%
Percentage of decrease in defined benefit obligation (1.00%) (1.00%)
Actuarial Assumption of Expected Rates of Salary Increases [Member]    
Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Line Items]    
Increase (decrease) in defined benefit obligation due to 1% increase ₱ 19,334 ₱ 19,334
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ (15,229) ₱ (15,229)
Percentage of increase in defined benefit obligation 1.00% 1.00%
Percentage of decrease in defined benefit obligation (1.00%) (1.00%)
Actuarial Assumption of Expected Rates of Salary Increases [Member] | Defined Contribution Plans [Member]    
Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Line Items]    
Increase (decrease) in defined benefit obligation due to 1% increase ₱ 32 ₱ 32
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ (32) ₱ (32)
Percentage of increase in defined benefit obligation 1.00% 1.00%
Percentage of decrease in defined benefit obligation (1.00%) (1.00%)