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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, 2021
Dec. 31, 2020
Disclosure Of Reconciliation Of Changes In Loss Allowance And Explanation Of Changes In Gross Carrying Amount For Financial Instruments [Line Items]    
Less allowance ₱ 14,447 ₱ 16,825
Carrying amount 51,597 67,234
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 66,044 84,059
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 38,431 52,857
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 4,672 5,006
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 8,494 9,371
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 14,447 16,825
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 612 574
Carrying amount 29,807 45,181
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 30,419 45,755
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 29,251 44,618
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 556 563
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 612 574
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 3,038 3,960
Carrying amount 21,790 22,053
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 24,828 26,013
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 9,180 8,239
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 4,116 4,443
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 8,494 9,371
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 3,038 3,960
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 10,797 12,291
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 10,797 12,291
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 ₱ 10,797 ₱ 12,291