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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, 2022
Dec. 31, 2021
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 ₱ (14,223)  
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ 17,579  
Percentage of increase in defined benefit obligation 1.00%  
Percentage of decrease in defined benefit obligation (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   ₱ (4)
Increase (decrease) in defined benefit obligation due to 1% decrease   ₱ 614
Percentage of increase in defined benefit obligation   0.20%
Percentage of decrease in defined benefit obligation   (0.10%)
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 ₱ 17,587  
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ (4,189)  
Percentage of increase in defined benefit obligation 1.00%  
Percentage of decrease in defined benefit obligation (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   ₱ 614
Increase (decrease) in defined benefit obligation due to 1% decrease   ₱ (4)
Percentage of increase in defined benefit obligation   0.20%
Percentage of decrease in defined benefit obligation   (0.10%)