XML 179 R166.htm IDEA: XBRL DOCUMENT v3.19.1
Employee Benefits - Summary of Sensitivity Analysis on Defined Benefit Obligation of Defined Benefit Pension Plans (Detail)
₱ in Millions
Dec. 31, 2018
PHP (₱)
Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Line Items]  
Percentage of decrease in defined benefit obligation (20.00%)
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 ₱ (664)
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ 1,011
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 ₱ (6)
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ 11
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]  
Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Line Items]  
Increase (decrease) in defined benefit obligation due to 1% increase ₱ 1,015
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ (679)
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 ₱ 11
Increase (decrease) in defined benefit obligation due to 1% decrease ₱ (6)
Percentage of increase in defined benefit obligation 1.00%
Percentage of decrease in defined benefit obligation (1.00%)