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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, 2023
Dec. 31, 2022
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 ₱ 15,762 ₱ 15,762
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ (19,838) ₱ (19,838)
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 ₱ 28 ₱ 28
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ (28) ₱ (28)
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 ₱ 19,903 ₱ 19,903
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ (15,732) ₱ (15,732)
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 ₱ 28 ₱ 28
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ (28) ₱ (28)
Percentage of increase in defined benefit obligation 1.00% 1.00%
Percentage of decrease in defined benefit obligation (1.00%) (1.00%)