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Interest Income - Summary of interest income (Detail)
$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure of Interest Income [Abstract]        
Cash and cash equivalents $ 49,740.0   $ 17,831.3 $ 2,834.8
Financial assets at amortized cost 6,363.7   2,008.6 681.5
Financial assets at FVTOCI 4,190.2   2,582.3 2,192.5
Interest income $ 60,293.9 $ 1,969.1 $ 22,422.2 $ 5,708.8