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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail)
$ in Millions, $ in Millions
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of financial assets [abstract]            
Cash and deposits in banks $ 1,058,808.1   $ 653,580.6      
Repurchase agreements 5,275.3   1,750.4      
Government bonds 906.8   3,716.1      
Commercial paper 0.0   1,123.5      
Cash and cash equivalents $ 1,064,990.2 $ 38,391.9 $ 660,170.6 $ 23,798.5 $ 455,399.3 $ 577,814.6