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Financial Assets and Liabilities - Summary of Maximum Exposure to Credit Risk of Financial Assets Subject to Impairment (Detail) - PHP (₱)
₱ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Less allowance ₱ 16,739 ₱ 14,723
Carrying amount 83,828 104,220
Costs [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 100,567 118,943
Stage 1 Lifetime ECL [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Less allowance 236  
Carrying amount 59,772  
Stage 1 Lifetime ECL [Member] | Costs [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 60,008  
Stage 2 Lifetime ECL [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Less allowance 1,595  
Carrying amount 24,056  
Stage 2 Lifetime ECL [Member] | Costs [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 25,651  
Stage 3 Lifetime ECL [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Less allowance 14,908  
Stage 3 Lifetime ECL [Member] | Costs [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 14,908  
High grade [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 67,075 83,259
High grade [Member] | Stage 1 Lifetime ECL [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 58,299  
High grade [Member] | Stage 2 Lifetime ECL [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 8,776  
Standard grade [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 9,351 9,933
Standard grade [Member] | Stage 1 Lifetime ECL [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 1,470  
Standard grade [Member] | Stage 2 Lifetime ECL [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 7,881  
Substarndard grade [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 7,402 11,028
Substarndard grade [Member] | Stage 1 Lifetime ECL [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 3  
Substarndard grade [Member] | Stage 2 Lifetime ECL [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 7,399  
Default [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 16,739 ₱ 14,723
Default [Member] | Stage 1 Lifetime ECL [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 236  
Default [Member] | Stage 2 Lifetime ECL [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure 1,595  
Default [Member] | Stage 3 Lifetime ECL [Member]    
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Credit exposure ₱ 14,908