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Income and Expenses - Summary of Interest Income (Detail) - PHP (₱)
₱ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Analysis Of Income And Expense [Abstract]      
Interest income on cash and cash equivalents (Note 16) ₱ 560 ₱ 1,022 ₱ 957
Interest income arising from revenue contracts with customers 414 430 340
Interest income on financial instruments at FVOCI 70 239  
Interest income on financial instruments at amortized cost (Note 13) 1 6 6
Interest income – others 165 48 640
Total interest income ₱ 1,210 ₱ 1,745 ₱ 1,943