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Income and Expenses - Summary of Interest Income (Detail) - PHP (₱)
₱ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Analysis Of Income And Expense [Abstract]      
Interest income on cash and cash equivalents (Note 16) ₱ 1,022 ₱ 957 ₱ 612
Interest income arising from revenue contracts with customers 430 340  
Interest income on financial instruments at FVOCI 239    
Interest income on financial instruments at amortized cost (Note 13) 6 6 8
Interest income – others 48 640 792
Total interest income ₱ 1,745 ₱ 1,943 ₱ 1,412