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Pension and Other Employee Benefits - Summary of Expected Future Settlements of Defined Contribution Plans (Detail) - PHP (₱)
₱ in Millions
Dec. 31, 2019
Jan. 01, 2019
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Add: Payments in optional extension periods not recognized as at December 31, 2018   ₱ 4,994
Less than 1 year [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Add: Payments in optional extension periods not recognized as at December 31, 2018 ₱ 644  
2021 [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Add: Payments in optional extension periods not recognized as at December 31, 2018 362  
2022 [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Add: Payments in optional extension periods not recognized as at December 31, 2018 377  
2023 [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Add: Payments in optional extension periods not recognized as at December 31, 2018 620  
2024 [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Add: Payments in optional extension periods not recognized as at December 31, 2018 1,011  
More than five years [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Add: Payments in optional extension periods not recognized as at December 31, 2018 128,008  
Defined Contribution Plans [member] | Less than 1 year [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Add: Payments in optional extension periods not recognized as at December 31, 2018 523  
Defined Contribution Plans [member] | 2021 [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Add: Payments in optional extension periods not recognized as at December 31, 2018 101  
Defined Contribution Plans [member] | 2022 [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Add: Payments in optional extension periods not recognized as at December 31, 2018 100  
Defined Contribution Plans [member] | 2023 [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Add: Payments in optional extension periods not recognized as at December 31, 2018 113  
Defined Contribution Plans [member] | 2024 [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Add: Payments in optional extension periods not recognized as at December 31, 2018 153  
Defined Contribution Plans [member] | More than five years [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Add: Payments in optional extension periods not recognized as at December 31, 2018 ₱ 1,295