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Pension and Other Employee Benefits - Summary of Sensitivity Analysis on Defined Benefit Obligation of Defined Benefit Pension Plans (Detail)
₱ in Millions
Dec. 31, 2020
PHP (₱)
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 ₱ (2,869)
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ 3,448
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 ₱ (25)
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ 96
Percentage of increase in defined benefit obligation 3.50%
Percentage of decrease in defined benefit obligation (0.90%)
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 ₱ 3,328
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ (2,835)
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 ₱ (92)
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ (25)
Percentage of increase in defined benefit obligation 3.30%
Percentage of decrease in defined benefit obligation (0.90%)