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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, 2020
Dec. 31, 2019
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Less allowance ₱ 16,825 ₱ 17,202
Carrying amount 67,234 53,394
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 84,059 70,596
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 52,857 38,469
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 5,006 7,934
Substandard 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 9,371 6,991
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 16,825 17,202
Stage 1 12-Month 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 574 298
Carrying amount 45,181 30,958
Stage 1 12-Month 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 45,755 31,256
Stage 1 12-Month ECL [Member] | 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 44,618 29,241
Stage 1 12-Month ECL [Member] | 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 563 1,710
Stage 1 12-Month ECL [Member] | Substandard 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
Stage 1 12-Month ECL [Member] | 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 574 298
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 3,960 1,763
Carrying amount 22,053 22,436
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 26,013 24,199
Stage 2 Lifetime ECL [Member] | 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 8,239 9,228
Stage 2 Lifetime ECL [Member] | 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 4,443 6,224
Stage 2 Lifetime ECL [Member] | Substandard 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 9,371 6,984
Stage 2 Lifetime ECL [Member] | 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 3,960 1,763
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 12,291 15,141
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 12,291 15,141
Stage 3 Lifetime ECL [Member] | 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 ₱ 12,291 ₱ 15,141